diff --git a/swad_agenda.c b/swad_agenda.c
index 0805c68c..d90af5ae 100644
--- a/swad_agenda.c
+++ b/swad_agenda.c
@@ -1039,11 +1039,8 @@ static void Agd_PutParamAgdCod (long AgdCod)
 
 long Agd_GetParamAgdCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of event *****/
-   Par_GetParToText ("AgdCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of event *****/
+   return Par_GetParToLong ("AgdCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_announcement.c b/swad_announcement.c
index 06a09e41..c5e8d203 100644
--- a/swad_announcement.c
+++ b/swad_announcement.c
@@ -387,12 +387,10 @@ static void Ann_PutParams (void)
 
 static long Ann_GetParamAnnCod (void)
   {
-   char LongStr[1 + 10 + 1];	// String that holds the announcement code
    long AnnCod;
 
-   /* Get announcement code */
-   Par_GetParToText ("AnnCod",LongStr,1 + 10);
-   if (sscanf (LongStr,"%ld",&AnnCod) != 1)
+   /***** Get announcement code *****/
+   if ((AnnCod = Par_GetParToLong ("AnnCod")) <= 0)
       Lay_ShowErrorAndExit ("Wrong code of announcement.");
 
    return AnnCod;
diff --git a/swad_assignment.c b/swad_assignment.c
index 0bb52001..fc22544e 100644
--- a/swad_assignment.c
+++ b/swad_assignment.c
@@ -929,11 +929,8 @@ static void Asg_PutParamAsgCod (long AsgCod)
 
 long Asg_GetParamAsgCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of assignment *****/
-   Par_GetParToText ("AsgCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of assignment *****/
+   return Par_GetParToLong ("AsgCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_attendance.c b/swad_attendance.c
index 9a1cfaaa..9eeb0608 100644
--- a/swad_attendance.c
+++ b/swad_attendance.c
@@ -893,11 +893,8 @@ void Att_PutParamAttCod (long AttCod)
 
 long Att_GetParamAttCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of attendance event *****/
-   Par_GetParToText ("AttCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of attendance event *****/
+   return Par_GetParToLong ("AttCod");
   }
 
 /*****************************************************************************/
@@ -1280,7 +1277,6 @@ void Att_RecFormAttEvent (void)
    extern const char *Txt_The_event_has_been_modified;
    struct AttendanceEvent OldAtt;
    struct AttendanceEvent ReceivedAtt;
-   char YN[1 + 1];
    bool ItsANewAttEvent;
    bool ReceivedAttEventIsCorrect = true;
    char Txt[Cns_MAX_BYTES_TEXT + 1];
@@ -1301,8 +1297,7 @@ void Att_RecFormAttEvent (void)
    ReceivedAtt.TimeUTC[Att_END_TIME  ] = Dat_GetTimeUTCFromForm ("EndTimeUTC"  );
 
    /***** Get boolean parameter that indicates if teacher's comments are visible by students *****/
-   Par_GetParToText ("ComTchVisible",YN,1);
-   ReceivedAtt.CommentTchVisible = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   ReceivedAtt.CommentTchVisible = Par_GetParToBool ("ComTchVisible");
 
    /***** Get attendance event title *****/
    Par_GetParToText ("Title",ReceivedAtt.Title,Att_MAX_LENGTH_ATTENDANCE_EVENT_TITLE);
@@ -2719,14 +2714,12 @@ void Usr_PrintMyAttendanceCrs (void)
 static void Usr_ListOrPrintMyAttendanceCrs (Att_TypeOfView_t TypeOfView)
   {
    unsigned NumAttEvent;
-   char YN[1 + 1];
 
    /***** Get list of attendance events *****/
    Att_GetListAttEvents (Att_OLDEST_FIRST);
 
    /***** Get boolean parameter that indicates if details must be shown *****/
-   Par_GetParToText ("ShowDetails",YN,1);
-   Gbl.AttEvents.ShowDetails = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.AttEvents.ShowDetails = Par_GetParToBool ("ShowDetails");
 
    /***** Get list of groups selected ******/
    Grp_GetParCodsSeveralGrpsToShowUsrs ();
@@ -2785,7 +2778,6 @@ static void Usr_ListOrPrintStdsAttendanceCrs (Att_TypeOfView_t TypeOfView)
    unsigned NumStdsInList;
    long *LstSelectedUsrCods;
    unsigned NumAttEvent;
-   char YN[1 + 1];
 
    /***** Get list of attendance events *****/
    Att_GetListAttEvents (Att_OLDEST_FIRST);
@@ -2797,8 +2789,7 @@ static void Usr_ListOrPrintStdsAttendanceCrs (Att_TypeOfView_t TypeOfView)
    if ((NumStdsInList = Usr_CountNumUsrsInListOfSelectedUsrs ()))
      {
       /***** Get boolean parameter that indicates if details must be shown *****/
-      Par_GetParToText ("ShowDetails",YN,1);
-      Gbl.AttEvents.ShowDetails = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+      Gbl.AttEvents.ShowDetails = Par_GetParToBool ("ShowDetails");
 
       /***** Get list of groups selected ******/
       Grp_GetParCodsSeveralGrpsToShowUsrs ();
diff --git a/swad_banner.c b/swad_banner.c
index 8b11099e..386d0ce9 100644
--- a/swad_banner.c
+++ b/swad_banner.c
@@ -423,11 +423,8 @@ static void Ban_PutParamBanCod (long BanCod)
 
 long Ban_GetParamBanCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of banner *****/
-   Par_GetParToText ("BanCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of banner *****/
+   return Par_GetParToLong ("BanCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_centre.c b/swad_centre.c
index f28b735d..a70e312e 100644
--- a/swad_centre.c
+++ b/swad_centre.c
@@ -94,7 +94,6 @@ static Ctr_StatusTxt_t Ctr_GetStatusTxtFromStatusBits (Ctr_Status_t Status);
 static Ctr_Status_t Ctr_GetStatusBitsFromStatusTxt (Ctr_StatusTxt_t StatusTxt);
 
 static void Ctr_PutParamOtherCtrCod (long CtrCod);
-static long Ctr_GetParamOtherCtrCod (void);
 
 static void Ctr_UpdateCtrInsDB (long CtrCod,long InsCod);
 static void Ctr_RenameCentre (struct Centre *Ctr,Cns_ShrtOrFullName_t ShrtOrFullName);
@@ -1670,21 +1669,12 @@ long Ctr_GetAndCheckParamOtherCtrCod (void)
    long CtrCod;
 
    /***** Get and check parameter with code of centre *****/
-   if ((CtrCod = Ctr_GetParamOtherCtrCod ()) < 0)
+   if ((CtrCod = Par_GetParToLong ("OthCtrCod")) <= 0)
       Lay_ShowErrorAndExit ("Code of centre is missing.");
 
    return CtrCod;
   }
 
-static long Ctr_GetParamOtherCtrCod (void)
-  {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of centre *****/
-   Par_GetParToText ("OthCtrCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
-  }
-
 /*****************************************************************************/
 /******************************* Remove a centre *****************************/
 /*****************************************************************************/
diff --git a/swad_changelog.h b/swad_changelog.h
index aa114c8d..eeaade7a 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -191,13 +191,15 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 16.127.3 (2017-01-28)"
+#define Log_PLATFORM_VERSION	"SWAD 16.129 (2017-01-28)"
 #define CSS_FILE		"swad16.123.css"
 #define JS_FILE			"swad16.123.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
+        Version 16.129:   Jan 28, 2017	Code refactoring in Y/N parameters. (211974 lines)
+        Version 16.128:   Jan 28, 2017	Code refactoring in long parameters. (212037 lines)
         Version 16.127.3: Jan 28, 2017	Fixed bug in permissions to change another user's data. (212127 lines)
         Version 16.127.2: Jan 28, 2017	Fixed bug creating a new account. (212124 lines)
         Version 16.127.1: Jan 28, 2017	Fixed bug in listing of users. (212125 lines)
diff --git a/swad_country.c b/swad_country.c
index 9652cc0e..7635eb2a 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -1601,11 +1601,8 @@ long Cty_GetAndCheckParamOtherCtyCod (void)
 
 static long Cty_GetParamOtherCtyCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of country *****/
-   Par_GetParToText ("OthCtyCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of country *****/
+   return Par_GetParToLong ("OthCtyCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_course.c b/swad_course.c
index 7082cb47..3080dd85 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -120,7 +120,6 @@ static void Sch_PutLinkToSearchCoursesParams (void);
 
 static void Crs_PutParamOtherCrsCod (long CrsCod);
 static long Crs_GetAndCheckParamOtherCrsCod (void);
-static long Crs_GetParamOtherCrsCod (void);
 
 static void Crs_WriteRowCrsData (unsigned NumCrs,MYSQL_ROW row,bool WriteColumnAccepted);
 
@@ -2977,21 +2976,12 @@ static long Crs_GetAndCheckParamOtherCrsCod (void)
    long CrsCod;
 
    /***** Get and check parameter with code of course *****/
-   if ((CrsCod = Crs_GetParamOtherCrsCod ()) < 0)
+   if ((CrsCod = Par_GetParToLong ("OthCrsCod")) <= 0)
       Lay_ShowErrorAndExit ("Code of course is missing.");
 
    return CrsCod;
   }
 
-static long Crs_GetParamOtherCrsCod (void)
-  {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of course *****/
-   Par_GetParToText ("OthCrsCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
-  }
-
 /*****************************************************************************/
 /************************** Write courses of a user **************************/
 /*****************************************************************************/
diff --git a/swad_date.c b/swad_date.c
index d64fc1bf..2b7da2da 100644
--- a/swad_date.c
+++ b/swad_date.c
@@ -519,11 +519,8 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 
 time_t Dat_GetTimeUTCFromForm (const char *ParamName)
   {
-   char LongStr[1 + 10 + 1];
-
    /**** Get time ****/
-   Par_GetParToText (ParamName,LongStr,1 + 10);
-   return Dat_GetUNIXTimeFromStr (LongStr);
+   return Par_GetParToLong (ParamName);
   }
 
 /*****************************************************************************/
diff --git a/swad_degree.c b/swad_degree.c
index 5e6d6460..8e272839 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -102,7 +102,6 @@ static void Deg_ListOneDegreeForSeeing (struct Degree *Deg,unsigned NumDeg);
 
 static void Deg_RecFormRequestOrCreateDeg (unsigned Status);
 static void Deg_PutParamOtherDegCod (long DegCod);
-static long Deg_GetParamOtherDegCod (void);
 
 static void Deg_GetDataOfDegreeFromRow (struct Degree *Deg,MYSQL_ROW row);
 static void Deg_RenameDegree (struct Degree *Deg,Cns_ShrtOrFullName_t ShrtOrFullName);
@@ -1652,21 +1651,12 @@ long Deg_GetAndCheckParamOtherDegCod (void)
    long DegCod;
 
    /***** Get and check parameter with code of degree *****/
-   if ((DegCod = Deg_GetParamOtherDegCod ()) < 0)
+   if ((DegCod = Par_GetParToLong ("OthDegCod")) <= 0)
       Lay_ShowErrorAndExit ("Code of degree is missing.");
 
    return DegCod;
   }
 
-static long Deg_GetParamOtherDegCod (void)
-  {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of degree *****/
-   Par_GetParToText ("OthDegCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
-  }
-
 /*****************************************************************************/
 /********************* Get data of a degree from its code ********************/
 /*****************************************************************************/
diff --git a/swad_degree_type.c b/swad_degree_type.c
index 3faa8aed..e38b4368 100644
--- a/swad_degree_type.c
+++ b/swad_degree_type.c
@@ -598,11 +598,8 @@ static void DT_PutParamOtherDegTypCod (long DegTypCod)
 
 long DT_GetParamOtherDegTypCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of degree type *****/
-   Par_GetParToText ("OthDegTypCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of degree type *****/
+   return Par_GetParToLong ("OthDegTypCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_department.c b/swad_department.c
index 9d3ed509..56ac36c9 100644
--- a/swad_department.c
+++ b/swad_department.c
@@ -616,11 +616,8 @@ static void Dpt_PutParamDptCod (long DptCod)
 
 long Dpt_GetParamDptCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of department *****/
-   Par_GetParToText ("DptCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of department *****/
+   return Par_GetParToLong ("DptCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_exam.c b/swad_exam.c
index 6abce7cc..2f15d1ab 100644
--- a/swad_exam.c
+++ b/swad_exam.c
@@ -1611,11 +1611,8 @@ void Exa_PutHiddenParamExaCod (long ExaCod)
 
 static long Exa_GetParamExaCod (void)
   {
-   char LongStr[1 + 10 + 1];	// String that holds the exam announcement code
-
    /* Get notice code */
-   Par_GetParToText ("ExaCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   return Par_GetParToLong ("ExaCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_file_browser.c b/swad_file_browser.c
index c7f6b4a3..50938c3a 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -2413,11 +2413,8 @@ void Brw_PutHiddenParamFilCod (long FilCod)
 
 long Brw_GetParamFilCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of file *****/
-   Par_GetParToText ("FilCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of file *****/
+   return Par_GetParToLong ("FilCod");
   }
 
 /*****************************************************************************/
@@ -4705,10 +4702,7 @@ void Brw_PutHiddenParamFullTreeIfSelected (void)
 
 static bool Brw_GetFullTreeFromForm (void)
   {
-   char YN[1 + 1];
-
-   Par_GetParToText ("FullTree",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("FullTree");
   }
 
 /*****************************************************************************/
@@ -9867,10 +9861,7 @@ void Brw_ChgFileMetadata (void)
 
 static bool Brw_GetParamPublicFile (void)
   {
-   char YN[1 + 1];
-
-   Par_GetParToText ("PublicFile",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("PublicFile");
   }
 
 /*****************************************************************************/
diff --git a/swad_forum.c b/swad_forum.c
index 4c641f8f..31ce5339 100644
--- a/swad_forum.c
+++ b/swad_forum.c
@@ -3729,7 +3729,6 @@ void For_GetParamsForum (void)
   {
    char UnsignedStr[10 + 1];
    unsigned UnsignedNum;
-   char LongStr[1 + 10 + 1];
 
    /***** Get which forums I want to see *****/
    Par_GetParToText ("WhichForum",UnsignedStr,10);
@@ -3746,23 +3745,19 @@ void For_GetParamsForum (void)
       Gbl.Forum.SelectedOrderType = For_DEFAULT_ORDER;
 
    /***** Get parameter with code of institution *****/
-   Par_GetParToText ("ForInsCod",LongStr,1 + 10);
-   Gbl.Forum.Ins.InsCod = Str_ConvertStrCodToLongCod (LongStr);
+   Gbl.Forum.Ins.InsCod = Par_GetParToLong ("ForInsCod");
    Ins_GetDataOfInstitutionByCod (&Gbl.Forum.Ins,Ins_GET_BASIC_DATA);
 
    /***** Get parameter with code of institution *****/
-   Par_GetParToText ("ForCtrCod",LongStr,1 + 10);
-   Gbl.Forum.Ctr.CtrCod = Str_ConvertStrCodToLongCod (LongStr);
+   Gbl.Forum.Ctr.CtrCod = Par_GetParToLong ("ForCtrCod");
    Ctr_GetDataOfCentreByCod (&Gbl.Forum.Ctr);
 
    /***** Get parameter with code of degree *****/
-   Par_GetParToText ("ForDegCod",LongStr,1 + 10);
-   Gbl.Forum.Deg.DegCod = Str_ConvertStrCodToLongCod (LongStr);
+   Gbl.Forum.Deg.DegCod = Par_GetParToLong ("ForDegCod");
    Deg_GetDataOfDegreeByCod (&Gbl.Forum.Deg);
 
    /***** Get parameter with code of course *****/
-   Par_GetParToText ("ForCrsCod",LongStr,1 + 10);
-   Gbl.Forum.Crs.CrsCod = Str_ConvertStrCodToLongCod (LongStr);
+   Gbl.Forum.Crs.CrsCod = Par_GetParToLong ("ForCrsCod");
    Crs_GetDataOfCourseByCod (&Gbl.Forum.Crs);
   }
 
@@ -3781,12 +3776,10 @@ void For_PutHiddenParamThrCod (long ThrCod)
 
 static long For_GetParamThrCod (void)
   {
-   char StrThrCod[1 + 10 + 1];	// String that holds the thread code
    long ThrCod;
 
-   /* Get thread code */
-   Par_GetParToText ("ThrCod",StrThrCod,1 + 10);
-   if (sscanf (StrThrCod,"%ld",&ThrCod) != 1)
+   /***** Get thread code *****/
+   if ((ThrCod = Par_GetParToLong ("ThrCod")) <= 0)
       Lay_ShowErrorAndExit ("Wrong thread code.");
 
    return ThrCod;
@@ -3807,12 +3800,10 @@ static void For_PutHiddenParamPstCod (long PstCod)
 
 static long For_GetParamPstCod (void)
   {
-   char StrPstCod[1 + 10 + 1];	// String that holds the post code
    long PstCod;
 
-   /* Get post code */
-   Par_GetParToText ("PstCod",StrPstCod,1 + 10);
-   if (sscanf (StrPstCod,"%ld",&PstCod) != 1)
+   /***** Get post code *****/
+   if ((PstCod = Par_GetParToLong ("PstCod")) <= 0)
       Lay_ShowErrorAndExit ("Wrong post code.");
 
    return PstCod;
diff --git a/swad_group.c b/swad_group.c
index af4e6dd7..add272cb 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -342,7 +342,6 @@ void Grp_PutParamsCodGrps (void)
 
 void Grp_GetParCodsSeveralGrpsToShowUsrs (void)
   {
-   char YN[1 + 1];
    struct ListCodGrps LstGrpsIBelong;
    unsigned NumGrp;
 
@@ -350,8 +349,7 @@ void Grp_GetParCodsSeveralGrpsToShowUsrs (void)
       return;
 
    /***** Get boolean parameter that indicates if all groups must be listed *****/
-   Par_GetParToText ("AllGroups",YN,1);
-   Gbl.Usrs.ClassPhoto.AllGroups = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.Usrs.ClassPhoto.AllGroups = Par_GetParToBool ("AllGroups");
 
    /***** Get parameter with list of groups selected *****/
    Grp_GetParCodsSeveralGrps ();
@@ -3084,19 +3082,16 @@ void Grp_RecFormNewGrpTyp (void)
   {
    extern const char *Txt_The_type_of_group_X_already_exists;
    extern const char *Txt_You_must_specify_the_name_of_the_new_type_of_group;
-   char YN[1 + 1];
 
    /***** Get parameters from form *****/
    /* Get the name of group type */
    Par_GetParToText ("GrpTypName",Gbl.CurrentCrs.Grps.GrpTyp.GrpTypName,Grp_MAX_LENGTH_GROUP_TYPE_NAME);
 
    /* Get whether it is mandatory to regisrer in any group of this type */
-   Par_GetParToText ("MandatoryEnrollment",YN,1);
-   Gbl.CurrentCrs.Grps.GrpTyp.MandatoryEnrollment = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.CurrentCrs.Grps.GrpTyp.MandatoryEnrollment = Par_GetParToBool ("MandatoryEnrollment");
 
    /* Get whether it is possible to register in multiple groups of this type */
-   Par_GetParToText ("MultipleEnrollment",YN,1);
-   Gbl.CurrentCrs.Grps.GrpTyp.MultipleEnrollment = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.CurrentCrs.Grps.GrpTyp.MultipleEnrollment = Par_GetParToBool ("MultipleEnrollment");
 
    /* Get open time */
    Gbl.CurrentCrs.Grps.GrpTyp.OpenTimeUTC = Dat_GetTimeUTCFromForm ("OpenTimeUTC");
@@ -3691,7 +3686,6 @@ void Grp_ChangeMandatGrpTyp (void)
    extern const char *Txt_The_enrollment_of_students_into_groups_of_type_X_is_now_mandatory;
    extern const char *Txt_The_enrollment_of_students_into_groups_of_type_X_is_now_voluntary;
    char Query[1024];
-   char YN[1 + 1];
    bool NewMandatoryEnrollment;
 
    /***** Get parameters of the form *****/
@@ -3700,8 +3694,7 @@ void Grp_ChangeMandatGrpTyp (void)
       Lay_ShowErrorAndExit ("Code of type of group is missing.");
 
    /* Get the new type of enrollment (mandatory or voluntaria) of this type of group */
-   Par_GetParToText ("MandatoryEnrollment",YN,1);
-   NewMandatoryEnrollment = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   NewMandatoryEnrollment = Par_GetParToBool ("MandatoryEnrollment");
 
    /* Get from the database the name of the type and the old type of enrollment */
    Grp_GetDataOfGroupTypeByCod (&Gbl.CurrentCrs.Grps.GrpTyp);
@@ -3746,7 +3739,6 @@ void Grp_ChangeMultiGrpTyp (void)
    extern const char *Txt_Now_each_student_can_belong_to_multiple_groups_of_type_X;
    extern const char *Txt_Now_each_student_can_only_belong_to_a_group_of_type_X;
    char Query[1024];
-   char YN[1 + 1];
    bool NewMultipleEnrollment;
 
    /***** Get parameters from the form *****/
@@ -3755,8 +3747,7 @@ void Grp_ChangeMultiGrpTyp (void)
       Lay_ShowErrorAndExit ("Code of type of group is missing.");
 
    /* Get the new type of enrollment (single or multiple) of this type of group */
-   Par_GetParToText ("MultipleEnrollment",YN,1);
-   NewMultipleEnrollment = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   NewMultipleEnrollment = Par_GetParToBool ("MultipleEnrollment");
 
    /* Get from the database the name of the type and the old type of enrollment */
    Grp_GetDataOfGroupTypeByCod (&Gbl.CurrentCrs.Grps.GrpTyp);
@@ -4064,11 +4055,8 @@ void Grp_RenameGroup (void)
 
 static long Grp_GetParamGrpTypCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of group type *****/
-   Par_GetParToText ("GrpTypCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of group type *****/
+   return Par_GetParToLong ("GrpTypCod");
   }
 
 /*****************************************************************************/
@@ -4077,11 +4065,8 @@ static long Grp_GetParamGrpTypCod (void)
 
 static long Grp_GetParamGrpCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with group code *****/
-   Par_GetParToText ("GrpCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get group code *****/
+   return Par_GetParToLong ("GrpCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_holiday.c b/swad_holiday.c
index b07052a2..c6b7face 100644
--- a/swad_holiday.c
+++ b/swad_holiday.c
@@ -622,11 +622,8 @@ static void Hld_PutParamHldCod (long HldCod)
 
 long Hld_GetParamHldCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of holiday *****/
-   Par_GetParToText ("HldCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of holiday *****/
+   return Par_GetParToLong ("HldCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_indicator.c b/swad_indicator.c
index 0f985bce..e6017081 100644
--- a/swad_indicator.c
+++ b/swad_indicator.c
@@ -494,15 +494,13 @@ static unsigned Ind_GetTableOfCourses (MYSQL_RES **mysql_res)
 static bool Ind_GetIfShowBigList (unsigned NumCrss)
   {
    bool ShowBigList;
-   char YN[1 + 1];
 
    /***** If list of courses is too big... *****/
    if (NumCrss <= Cfg_MIN_NUM_COURSES_TO_CONFIRM_SHOW_BIG_LIST)
       return true;	// List is not too big ==> show it
 
    /***** Get parameter with user's confirmation to see a big list of courses *****/
-   Par_GetParToText ("ShowBigList",YN,1);
-   if (!(ShowBigList = (Str_ConvertToUpperLetter (YN[0]) == 'Y')))
+   if (!(ShowBigList = Par_GetParToBool ("ShowBigList")))
       Ind_PutButtonToConfirmIWantToSeeBigList (NumCrss);
 
    return ShowBigList;
diff --git a/swad_info.c b/swad_info.c
index cd9fcc59..97ffe022 100644
--- a/swad_info.c
+++ b/swad_info.c
@@ -669,11 +669,7 @@ void Inf_ChangeIHaveReadInfo (void)
 
 static bool Inf_GetMustBeReadFromForm (void)
   {
-   char YN[1 + 1];
-
-   /***** Get a parameter that indicates if info must be read by students ******/
-   Par_GetParToText ("MustBeRead",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("MustBeRead");
   }
 
 /*****************************************************************************/
@@ -682,11 +678,7 @@ static bool Inf_GetMustBeReadFromForm (void)
 
 static bool Inf_GetIfIHaveReadFromForm (void)
   {
-   char YN[1 + 1];
-
-   /***** Get a parameter that indicates if I have read a course info ******/
-   Par_GetParToText ("IHaveRead",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("IHaveRead");
   }
 
 /*****************************************************************************/
diff --git a/swad_institution.c b/swad_institution.c
index 29377ebf..33058070 100644
--- a/swad_institution.c
+++ b/swad_institution.c
@@ -1556,11 +1556,8 @@ long Ins_GetAndCheckParamOtherInsCod (void)
 
 static long Ins_GetParamOtherInsCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of institution *****/
-   Par_GetParToText ("OthInsCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of institution *****/
+   return Par_GetParToLong ("OthInsCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_link.c b/swad_link.c
index c1c10e30..42b42333 100644
--- a/swad_link.c
+++ b/swad_link.c
@@ -409,11 +409,8 @@ static void Lnk_PutParamLnkCod (long LnkCod)
 
 long Lnk_GetParamLnkCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of link *****/
-   Par_GetParToText ("LnkCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of link *****/
+   return Par_GetParToLong ("LnkCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_mail.c b/swad_mail.c
index 13182e60..e2843ffd 100644
--- a/swad_mail.c
+++ b/swad_mail.c
@@ -533,11 +533,8 @@ static void Mai_PutParamMaiCod (long MaiCod)
 
 long Mai_GetParamMaiCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of mail *****/
-   Par_GetParToText ("MaiCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of mail *****/
+   return Par_GetParToLong ("MaiCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_message.c b/swad_message.c
index 91d1761d..edb6183b 100644
--- a/swad_message.c
+++ b/swad_message.c
@@ -173,7 +173,6 @@ static void Msg_PutFormMsgUsrs (char Content[Cns_MAX_BYTES_LONG_TEXT + 1])
    extern const char *Txt_New_message;
    extern const char *Txt_MSG_To;
    extern const char *Txt_Send_message;
-   char YN[1 + 1];
    unsigned NumUsrsInCrs = 0;	// Initialized to avoid warning
    bool ShowUsrsInCrs = false;
    bool GetUsrsInCrs;
@@ -182,21 +181,17 @@ static void Msg_PutFormMsgUsrs (char Content[Cns_MAX_BYTES_LONG_TEXT + 1])
    Gbl.Usrs.LstUsrs[Rol_STUDENT].NumUsrs = 0;
 
    /***** Get parameter that indicates if the message is a reply to another message *****/
-   Par_GetParToText ("IsReply",YN,1);
-   if ((Gbl.Msg.Reply.IsReply = (Str_ConvertToUpperLetter (YN[0]) == 'Y')))
+   if ((Gbl.Msg.Reply.IsReply = Par_GetParToBool ("IsReply")))
       /* Get original message code */
       if ((Gbl.Msg.Reply.OriginalMsgCod = Msg_GetParamMsgCod ()) <= 0)
          Lay_ShowErrorAndExit ("Wrong code of message.");
 
    /***** Get user's code of possible preselected recipient *****/
    if (Usr_GetParamOtherUsrCodEncryptedAndGetUsrData ())	// There is a preselected recipient
-     {
       /* Get who to show as potential recipients:
          - only the selected recipient
          - any user (default) */
-      Par_GetParToText ("ShowOnlyOneRecipient",YN,1);
-      Gbl.Msg.ShowOnlyOneRecipient = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
-     }
+      Gbl.Msg.ShowOnlyOneRecipient = Par_GetParToBool ("ShowOnlyOneRecipient");
    else
       Gbl.Msg.ShowOnlyOneRecipient = false;
 
@@ -637,7 +632,6 @@ void Msg_RecMsgFromUsr (void)
    extern const char *Txt_The_message_has_been_sent_to_1_recipient;
    extern const char *Txt_The_message_has_been_sent_to_X_recipients;
    extern const char *Txt_There_have_been_X_errors_in_sending_the_message;
-   char YN[1 + 1];
    bool IsReply;
    bool RecipientHasBannedMe;
    bool Replied = false;
@@ -665,8 +659,7 @@ void Msg_RecMsgFromUsr (void)
                               Str_DONT_CHANGE,false);
 
    /* Get parameter that indicates if the message is a reply to a previous message */
-   Par_GetParToText ("IsReply",YN,1);
-   if ((IsReply = (Str_ConvertToUpperLetter (YN[0]) == 'Y')))
+   if ((IsReply = Par_GetParToBool ("IsReply")))
       /* Get original message code */
       if ((OriginalMsgCod = Msg_GetParamMsgCod ()) <= 0)
          Lay_ShowErrorAndExit ("Wrong code of message.");
@@ -1011,12 +1004,9 @@ static void Msg_ShowNumMsgsDeleted (unsigned NumMsgs)
 void Msg_GetParamMsgsCrsCod (void)
   {
    extern const char *Txt_any_course;
-   char LongStr[1 + 10 + 1];
    struct Course Crs;
 
-   Par_GetParToText ("FilterCrsCod",LongStr,1 + 10);
-   Gbl.Msg.FilterCrsCod = Str_ConvertStrCodToLongCod (LongStr);
-   if (Gbl.Msg.FilterCrsCod > 0)	// If origin course specified
+   if ((Gbl.Msg.FilterCrsCod = Par_GetParToLong ("FilterCrsCod")) > 0)	// If origin course specified
      {
       /* Get data of course */
       Crs.CrsCod = Gbl.Msg.FilterCrsCod;
@@ -2649,11 +2639,8 @@ static void Msg_ShowFormToShowOnlyUnreadMessages (void)
 
 static void Msg_GetParamOnlyUnreadMsgs (void)
   {
-   char YN[1 + 1];
-
    /***** Get parameter to show only unread (received) messages *****/
-   Par_GetParToText ("OnlyUnreadMsgs",YN,1);
-   Gbl.Msg.ShowOnlyUnreadMsgs = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.Msg.ShowOnlyUnreadMsgs = Par_GetParToBool ("OnlyUnreadMsgs");
   }
 
 /*****************************************************************************/
@@ -3362,7 +3349,6 @@ static void Msg_WriteMsgTo (long MsgCod)
    unsigned NumRecipientsKnown;
    unsigned NumRecipientsUnknown;
    unsigned NumRecipientsToShow;
-   char YN[1 + 1];
    struct UsrData UsrDat;
    bool Deleted;
    bool OpenByDst;
@@ -3408,12 +3394,9 @@ static void Msg_WriteMsgTo (long MsgCod)
       if (NumRecipientsKnown <= Msg_MAX_RECIPIENTS_TO_SHOW)
          NumRecipientsToShow = NumRecipientsKnown;
       else	// A lot of recipients
-        {
          /***** Get parameter that indicates if I want to see all recipients *****/
-         Par_GetParToText ("SeeAllRcpts",YN,1);
-         NumRecipientsToShow = (Str_ConvertToUpperLetter (YN[0]) == 'Y') ? NumRecipientsKnown :
-                                                                           Msg_DEF_RECIPIENTS_TO_SHOW;
-        }
+         NumRecipientsToShow = Par_GetParToBool ("SeeAllRcpts") ? NumRecipientsKnown :
+                                                                  Msg_DEF_RECIPIENTS_TO_SHOW;
 
       /***** Initialize structure with user's data *****/
       Usr_UsrDataConstructor (&UsrDat);
@@ -3599,11 +3582,8 @@ void Msg_PutHiddenParamMsgCod (long MsgCod)
 
 static long Msg_GetParamMsgCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of message *****/
-   Par_GetParToText ("MsgCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of message *****/
+   return Par_GetParToLong ("MsgCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_notice.c b/swad_notice.c
index fa990e80..225933a2 100644
--- a/swad_notice.c
+++ b/swad_notice.c
@@ -996,12 +996,10 @@ void Not_PutHiddenParamNotCod (long NotCod)
 
 static long Not_GetParamNotCod (void)
   {
-   char LongStr[1 + 10 + 1];	// String that holds the notice code
    long NotCod;
 
-   /* Get notice code */
-   Par_GetParToText ("NotCod",LongStr,1 + 10);
-   if (sscanf (LongStr,"%ld",&NotCod) != 1)
+   /***** Get notice code *****/
+   if ((NotCod = Par_GetParToLong ("NotCod")) <= 0)
       Lay_ShowErrorAndExit ("Wrong code of notice.");
 
    return NotCod;
diff --git a/swad_notification.c b/swad_notification.c
index 1849d359..d34c6389 100644
--- a/swad_notification.c
+++ b/swad_notification.c
@@ -673,10 +673,7 @@ static void Ntf_WriteFormAllNotifications (bool AllNotifications)
 
 static bool Ntf_GetAllNotificationsFromForm (void)
   {
-   char YN[1 + 1];
-
-   Par_GetParToText ("All",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("All");
   }
 
 /*****************************************************************************/
@@ -1956,7 +1953,6 @@ void Ntf_PutFormChangeNotifSentByEMail (void)
 static void Ntf_GetParamsNotifyEvents (void)
   {
    Ntf_NotifyEvent_t NotifyEvent;
-   char YN[1 + 1];
    bool CreateNotifForThisEvent;
 
    Gbl.Usrs.Me.UsrDat.Prefs.NotifNtfEvents = 0;
@@ -1965,14 +1961,13 @@ static void Ntf_GetParamsNotifyEvents (void)
 	NotifyEvent < Ntf_NUM_NOTIFY_EVENTS;
 	NotifyEvent++)	// 0 is reserved for Ntf_EVENT_UNKNOWN
      {
-      Par_GetParToText (Ntf_ParamNotifMeAboutNotifyEvents[NotifyEvent],YN,1);
-      if ((CreateNotifForThisEvent = (Str_ConvertToUpperLetter (YN[0]) == 'Y')))
+      if ((CreateNotifForThisEvent = Par_GetParToBool (Ntf_ParamNotifMeAboutNotifyEvents[NotifyEvent])))
          Gbl.Usrs.Me.UsrDat.Prefs.NotifNtfEvents |= (1 << NotifyEvent);
 
       if (CreateNotifForThisEvent)
 	{
-         Par_GetParToText (Ntf_ParamEmailMeAboutNotifyEvents[NotifyEvent],YN,1);
-         if (Str_ConvertToUpperLetter (YN[0]) == 'Y')
+         Par_GetParToBool (Ntf_ParamEmailMeAboutNotifyEvents[NotifyEvent]);
+         if (Par_GetParToBool (Ntf_ParamEmailMeAboutNotifyEvents[NotifyEvent]))
             Gbl.Usrs.Me.UsrDat.Prefs.EmailNtfEvents |= (1 << NotifyEvent);
 	}
      }
diff --git a/swad_parameter.c b/swad_parameter.c
index bd697f3c..0edf9f8c 100644
--- a/swad_parameter.c
+++ b/swad_parameter.c
@@ -872,6 +872,32 @@ unsigned Par_GetParToText (const char *ParamName,char *ParamValue,size_t MaxByte
                                      Str_TO_TEXT,true);
   }
 
+/*****************************************************************************/
+/******************** Get the long value of a parameter **********************/
+/*****************************************************************************/
+
+long Par_GetParToLong (const char *ParamName)
+  {
+   char LongStr[1 + 10 + 1];
+
+   /***** Get parameter with long number *****/
+   Par_GetParToText (ParamName,LongStr,1 + 10);
+   return Str_ConvertStrCodToLongCod (LongStr);
+  }
+
+/*****************************************************************************/
+/************************** Get a boolean parameter **************************/
+/*****************************************************************************/
+
+bool Par_GetParToBool (const char *ParamName)
+  {
+   char YN[1 + 1];
+
+   /***** Get parameter "Y"/"N" and convert to boolean *****/
+   Par_GetParToText (ParamName,YN,1);
+   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+  }
+
 /*****************************************************************************/
 /*** Get value of a single parameter and change format to not rigorous HTML **/
 /*****************************************************************************/
diff --git a/swad_parameter.h b/swad_parameter.h
index f1c6e7f0..b20dce07 100644
--- a/swad_parameter.h
+++ b/swad_parameter.h
@@ -72,6 +72,8 @@ unsigned Par_GetParameter (tParamType ParamType,const char *ParamName,
 void Par_GetMainParameters (void);
 
 unsigned Par_GetParToText (const char *ParamName,char *ParamValue,size_t MaxBytes);
+long Par_GetParToLong (const char *ParamName);
+bool Par_GetParToBool (const char *ParamName);
 unsigned Par_GetParToHTML (const char *ParamName,char *ParamValue,size_t MaxBytes);
 unsigned Par_GetParMultiToText (const char *ParamName,char *ParamValue,size_t MaxBytes);
 unsigned Par_GetParAndChangeFormat (const char *ParamName,char *ParamValue,size_t MaxBytes,
diff --git a/swad_password.c b/swad_password.c
index a32132ca..a6edd9de 100644
--- a/swad_password.c
+++ b/swad_password.c
@@ -927,8 +927,7 @@ bool Pwd_GetConfirmationOnDangerousAction (void)
    char EncryptedPassword[Cry_LENGTH_ENCRYPTED_STR_SHA512_BASE64 + 1];
 
    /***** Get if consent has been done *****/
-   Par_GetParToText ("Consent",YN,1);
-   if (Str_ConvertToUpperLetter (YN[0]) != 'Y')
+   if (Par_GetParToBool ("Consent"))
      {
       Lay_ShowAlert (Lay_WARNING,Txt_You_have_not_confirmed_the_action);
       return false;
diff --git a/swad_place.c b/swad_place.c
index a9b325ba..2be7a3d1 100644
--- a/swad_place.c
+++ b/swad_place.c
@@ -507,11 +507,8 @@ static void Plc_PutParamPlcCod (long PlcCod)
 
 long Plc_GetParamPlcCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of place *****/
-   Par_GetParToText ("PlcCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of place *****/
+   return Par_GetParToLong ("PlcCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_plugin.c b/swad_plugin.c
index 389183c6..c08a68cc 100644
--- a/swad_plugin.c
+++ b/swad_plugin.c
@@ -476,11 +476,8 @@ static void Plg_PutParamPlgCod (long PlgCod)
 
 long Plg_GetParamPlgCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of plugin *****/
-   Par_GetParToText ("PlgCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of plugin *****/
+   return Par_GetParToLong ("PlgCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_record.c b/swad_record.c
index 1e6d21d1..5e603f45 100644
--- a/swad_record.c
+++ b/swad_record.c
@@ -590,11 +590,8 @@ void Rec_ReqRemField (void)
 
 long Rec_GetFieldCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
    /***** Get the code of the field *****/
-   Par_GetParToText ("FieldCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   return Par_GetParToLong ("FieldCod");
   }
 
 /*****************************************************************************/
@@ -1492,14 +1489,9 @@ static void Rec_PutParamsShowOfficeHoursSeveralTchs (void)
 
 static bool Rec_GetParamShowOfficeHours (void)
   {
-   char YN[1 + 1];
+   if (Par_GetParToBool ("ParamOfficeHours"))
+      return Par_GetParToBool ("ShowOfficeHours");
 
-   Par_GetParToText ("ParamOfficeHours",YN,1);
-   if (Str_ConvertToUpperLetter (YN[0]) == 'Y')
-     {
-      Par_GetParToText ("ShowOfficeHours",YN,1);
-      return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
-     }
    return Rec_SHOW_OFFICE_HOURS_DEFAULT;
   }
 
@@ -3614,7 +3606,6 @@ void Rec_GetUsrNameFromRecordForm (struct UsrData *UsrDat)
 static void Rec_GetUsrExtraDataFromRecordForm (struct UsrData *UsrDat)
   {
    char UnsignedStr[10 + 1];
-   char LongStr[1 + 10 + 1];
    unsigned UnsignedNum;
 
    /***** Get sex from form *****/
@@ -3625,8 +3616,7 @@ static void Rec_GetUsrExtraDataFromRecordForm (struct UsrData *UsrDat)
 	 UsrDat->Sex = (Usr_Sex_t) UnsignedNum;
 
    /***** Get country code *****/
-   Par_GetParToText ("OthCtyCod",LongStr,1 + 10);
-   UsrDat->CtyCod = Str_ConvertStrCodToLongCod (LongStr);
+   UsrDat->CtyCod = Par_GetParToLong ("OthCtyCod");
 
    Par_GetParToText ("OriginPlace",UsrDat->OriginPlace,Cns_MAX_BYTES_STRING);
    Str_ConvertToTitleType (UsrDat->OriginPlace);
diff --git a/swad_social.c b/swad_social.c
index ac37af1a..9ab45759 100644
--- a/swad_social.c
+++ b/swad_social.c
@@ -2790,15 +2790,8 @@ void Soc_PutHiddenParamPubCod (long PubCod)
 
 static long Soc_GetParamNotCod (void)
   {
-   char LongStr[1 + 10 + 1];	// String that holds the social note code
-   long NotCod;
-
-   /* Get social note code */
-   Par_GetParToText ("NotCod",LongStr,1 + 10);
-   if (sscanf (LongStr,"%ld",&NotCod) != 1)
-      return -1L;
-
-   return NotCod;
+   /***** Get social note code *****/
+   return Par_GetParToLong ("NotCod");
   }
 
 /*****************************************************************************/
@@ -2807,15 +2800,8 @@ static long Soc_GetParamNotCod (void)
 
 static long Soc_GetParamPubCod (void)
   {
-   char LongStr[1 + 10 + 1];	// String that holds the code
-   long PubCod;
-
-   /* Get social comment code */
-   Par_GetParToText ("PubCod",LongStr,1 + 10);
-   if (sscanf (LongStr,"%ld",&PubCod) != 1)
-      return -1L;
-
-   return PubCod;
+   /***** Get social comment code *****/
+   return Par_GetParToLong ("PubCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_survey.c b/swad_survey.c
index aa323bf2..c4b6e27f 100644
--- a/swad_survey.c
+++ b/swad_survey.c
@@ -1508,11 +1508,8 @@ static void Svy_PutParamSvyCod (long SvyCod)
 
 static long Svy_GetParamSvyCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of survey *****/
-   Par_GetParToText ("SvyCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of survey *****/
+   return Par_GetParToLong ("SvyCod");
   }
 
 /*****************************************************************************/
@@ -2834,11 +2831,8 @@ static void Svy_PutParamQstCod (long QstCod)
 
 static long Svy_GetParamQstCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of survey *****/
-   Par_GetParToText ("QstCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of question *****/
+   return Par_GetParToLong ("QstCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_test.c b/swad_test.c
index 761d61cc..6a4709c6 100644
--- a/swad_test.c
+++ b/swad_test.c
@@ -497,7 +497,6 @@ void Tst_AssessTest (void)
    extern const char *Txt_The_test_X_has_already_been_assessed_previously;
    extern const char *Txt_There_was_an_error_in_assessing_the_test_X;
    unsigned NumTst;
-   char YN[1 + 1];
    long TstCod = -1L;	// Initialized to avoid warning
    unsigned NumQstsNotBlank;
    double TotalScore;
@@ -517,8 +516,7 @@ void Tst_AssessTest (void)
          Tst_GetParamNumQst ();
 
          /***** Get if test must be saved *****/
-	 Par_GetParToText ("Save",YN,1);
-	 Gbl.Test.AllowTeachers = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+	 Gbl.Test.AllowTeachers = Par_GetParToBool ("Save");
 
 	 /***** Get questions and answers from form to assess a test *****/
 	 Tst_GetQuestionsAndAnswersFromForm ();
@@ -581,7 +579,6 @@ static void Tst_GetQuestionsAndAnswersFromForm (void)
   {
    unsigned NumQst;
    char StrQstIndOrAns[3 + 10 + 1];	// "Qstxx...x", "Indxx...x" or "Ansxx...x"
-   char LongStr[1 + 10 + 1];
 
    /***** Get questions and answers *****/
    for (NumQst = 0;
@@ -590,8 +587,7 @@ static void Tst_GetQuestionsAndAnswersFromForm (void)
      {
       /* Get question code */
       sprintf (StrQstIndOrAns,"Qst%06u",NumQst);
-      Par_GetParToText (StrQstIndOrAns,LongStr,1 + 10);
-      if ((Gbl.Test.QstCodes[NumQst] = Str_ConvertStrCodToLongCod (LongStr)) < 0)
+      if ((Gbl.Test.QstCodes[NumQst] = Par_GetParToLong (StrQstIndOrAns)) <= 0)
 	 Lay_ShowErrorAndExit ("Code of question is missing.");
 
       /* Get indexes for this question */
@@ -1418,11 +1414,10 @@ void Tst_DisableTag (void)
 
 static long Tst_GetParamTagCode (void)
   {
-   char StrLong[1 + 10 + 1];
    long TagCod;
 
-   Par_GetParToText ("TagCod",StrLong,1 + 10);
-   if ((TagCod = Str_ConvertStrCodToLongCod (StrLong)) < 0)
+   /***** Get tag code *****/
+   if ((TagCod = Par_GetParToLong ("TagCod")) <= 0)
       Lay_ShowErrorAndExit ("Code of tag is missing.");
 
    return TagCod;
@@ -4274,15 +4269,13 @@ static bool Tst_GetParamsTst (void)
    extern const char *Txt_You_must_select_one_ore_more_tags;
    extern const char *Txt_You_must_select_one_ore_more_types_of_answer;
    extern const char *Txt_The_number_of_questions_must_be_in_the_interval_X;
-   char YN[1 + 1];
    bool Error = false;
    char UnsignedStr[10 + 1];
    unsigned UnsignedNum;
 
    /***** Tags *****/
    /* Get parameter that indicates whether all tags are selected */
-   Par_GetParToText ("AllTags",YN,1);
-   Gbl.Test.Tags.All = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.Test.Tags.All = Par_GetParToBool ("AllTags");
 
    /* Get the tags */
    if ((Gbl.Test.Tags.List = malloc (Tst_MAX_BYTES_TAGS_LIST + 1)) == NULL)
@@ -4298,8 +4291,7 @@ static bool Tst_GetParamsTst (void)
 
    /***** Types of answer *****/
    /* Get parameter that indicates if all types of answer are selected */
-   Par_GetParToText ("AllAnsTypes",YN,1);
-   Gbl.Test.AllAnsTypes = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.Test.AllAnsTypes = Par_GetParToBool ("AllAnsTypes");
 
    /* Get types of answer */
    Par_GetParMultiToText ("AnswerType",Gbl.Test.ListAnsTypes,Tst_MAX_BYTES_LIST_ANSWER_TYPES);
@@ -4394,10 +4386,7 @@ static void Tst_GetParamNumQst (void)
 
 static bool Tst_GetCreateXMLFromForm (void)
   {
-   char YN[1 + 1];
-
-   Par_GetParToText ("CreateXML",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("CreateXML");
   }
 
 /*****************************************************************************/
@@ -5322,7 +5311,6 @@ void Tst_ReceiveQst (void)
 static void Tst_GetQstFromForm (char *Stem,char *Feedback)
   {
    char UnsignedStr[10 + 1];
-   char YN[1 + 1];
    unsigned NumTag;
    unsigned NumTagRead;
    unsigned NumOpt;
@@ -5397,14 +5385,12 @@ static void Tst_GetQstFromForm (char *Stem,char *Feedback)
 	 Par_GetParToText ("AnsFloatMax",Gbl.Test.Answer.Options[1].Text,Tst_MAX_BYTES_FLOAT_ANSWER);
 	 break;
       case Tst_ANS_TRUE_FALSE:
-	 Par_GetParToText ("AnsTF",YN,1);
-	 Gbl.Test.Answer.TF = YN[0];
+	 Gbl.Test.Answer.TF = Par_GetParToBool ("AnsTF");
 	 break;
       case Tst_ANS_UNIQUE_CHOICE:
       case Tst_ANS_MULTIPLE_CHOICE:
          /* Get shuffle */
-         Par_GetParToText ("Shuffle",YN,1);
-         Gbl.Test.Shuffle = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+         Gbl.Test.Shuffle = Par_GetParToBool ("Shuffle");
          // No break
       case Tst_ANS_TEXT:
          /* Get the texts of the answers */
@@ -5880,7 +5866,6 @@ void Tst_RequestRemoveQst (void)
   {
    extern const char *Txt_Do_you_really_want_to_remove_the_question_X;
    extern const char *Txt_Remove_question;
-   char YN[1 + 1];
    bool EditingOnlyThisQst;
 
    /***** Get main parameters from form *****/
@@ -5891,8 +5876,7 @@ void Tst_RequestRemoveQst (void)
 
    /* Get a parameter that indicates whether it's necessary
       to continue listing the rest of questions */
-   Par_GetParToText ("OnlyThisQst",YN,1);
-   EditingOnlyThisQst = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   EditingOnlyThisQst = Par_GetParToBool ("OnlyThisQst");
 
    /***** Start form *****/
    Act_FormStart (ActRemTstQst);
@@ -5934,7 +5918,6 @@ void Tst_RemoveQst (void)
   {
    extern const char *Txt_Question_removed;
    char Query[512];
-   char YN[1 + 1];
    bool EditingOnlyThisQst;
 
    /***** Get the question code *****/
@@ -5944,8 +5927,7 @@ void Tst_RemoveQst (void)
 
    /***** Get a parameter that indicates whether it's necessary
           to continue listing the rest of questions ******/
-   Par_GetParToText ("OnlyThisQst",YN,1);
-   EditingOnlyThisQst = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   EditingOnlyThisQst = Par_GetParToBool ("OnlyThisQst");
 
    /***** Remove images associated to question *****/
    Tst_RemoveAllImgFilesFromAnsOfQst (Gbl.CurrentCrs.Crs.CrsCod,Gbl.Test.QstCod);
@@ -5983,7 +5965,6 @@ void Tst_ChangeShuffleQst (void)
    extern const char *Txt_The_answers_of_the_question_with_code_X_will_appear_shuffled;
    extern const char *Txt_The_answers_of_the_question_with_code_X_will_appear_without_shuffling;
    char Query[512];
-   char YN[1 + 1];
    bool EditingOnlyThisQst;
    bool Shuffle;
 
@@ -5993,12 +5974,10 @@ void Tst_ChangeShuffleQst (void)
       Lay_ShowErrorAndExit ("Wrong code of question.");
 
    /***** Get a parameter that indicates whether it's necessary to continue listing the rest of questions ******/
-   Par_GetParToText ("OnlyThisQst",YN,1);
-   EditingOnlyThisQst = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   EditingOnlyThisQst = Par_GetParToBool ("OnlyThisQst");
 
    /***** Get a parameter that indicates whether it's possible to shuffle the answers of this question ******/
-   Par_GetParToText ("Shuffle",YN,1);
-   Shuffle = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Shuffle = Par_GetParToBool ("Shuffle");
 
    /***** Remove the question from all the tables *****/
    /* Update the question changing the current shuffle */
@@ -6029,10 +6008,8 @@ void Tst_ChangeShuffleQst (void)
 
 static long Tst_GetQstCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   Par_GetParToText ("QstCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of test question *****/
+   return Par_GetParToLong ("QstCod");
   }
 
 /*****************************************************************************/
@@ -7573,11 +7550,8 @@ static void Tst_PutParamTstCod (long TstCod)
 
 static long Tst_GetParamTstCod (void)
   {
-   char LongStr[1 + 10 + 1];
-
-   /***** Get parameter with code of test *****/
-   Par_GetParToText ("TstCod",LongStr,1 + 10);
-   return Str_ConvertStrCodToLongCod (LongStr);
+   /***** Get code of test *****/
+   return Par_GetParToLong ("TstCod");
   }
 
 /*****************************************************************************/
diff --git a/swad_user.c b/swad_user.c
index 689ad257..33c9f705 100644
--- a/swad_user.c
+++ b/swad_user.c
@@ -5060,16 +5060,13 @@ void Usr_FreeUsrsList (Rol_Role_t Role)
 bool Usr_GetIfShowBigList (unsigned NumUsrs,const char *OnSubmit)
   {
    bool ShowBigList;
-   char YN[1 + 1];
 
    /***** If list of users is too big... *****/
    if (NumUsrs > Cfg_MIN_NUM_USERS_TO_CONFIRM_SHOW_BIG_LIST)
      {
       /***** Get parameter with user's confirmation
              to see a big list of users *****/
-      Par_GetParToText ("ShowBigList",YN,1);
-      ShowBigList = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
-      if (!ShowBigList)
+      if (!(ShowBigList = Par_GetParToBool ("ShowBigList")))
 	 Usr_PutButtonToConfirmIWantToSeeBigList (NumUsrs,OnSubmit);
 
       return ShowBigList;
@@ -6986,19 +6983,15 @@ void Usr_PutParamListWithPhotos (void)
 
 static bool Usr_GetParamListWithPhotosFromForm (void)
   {
-   char YN[1 + 1];
-
    /***** Get if exists parameter with preference about photos in users' list *****/
-   Par_GetParToText ("WithPhotosExists",YN,1);
-   if (Str_ConvertToUpperLetter (YN[0]) != 'Y')
+   if (Par_GetParToBool ("WithPhotosExists"))
      {
       Gbl.Usrs.Listing.WithPhotos = Usr_LIST_WITH_PHOTOS_DEF;
       return false;
      }
 
    /***** Parameter with preference about photos in users' list exists, so get it *****/
-   Par_GetParToText ("WithPhotos",YN,1);
-   Gbl.Usrs.Listing.WithPhotos = (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   Gbl.Usrs.Listing.WithPhotos = Par_GetParToBool ("WithPhotos");
    return true;
   }
 
diff --git a/swad_zip.c b/swad_zip.c
index 9f1dc16c..6ff705a1 100644
--- a/swad_zip.c
+++ b/swad_zip.c
@@ -140,10 +140,7 @@ static void ZIP_PutLinkToCreateZIPAsgWrkParams (void)
 
 bool ZIP_GetCreateZIPFromForm (void)
   {
-   char YN[1 + 1];
-
-   Par_GetParToText ("CreateZIP",YN,1);
-   return (Str_ConvertToUpperLetter (YN[0]) == 'Y');
+   return Par_GetParToBool ("CreateZIP");
   }
 
 /*****************************************************************************/