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From: apple@nprdc.navy.mil (Jim Apple)
Newsgroups: comp.windows.x,comp.windows.x.motif
Subject: Wcl/Motif question  ( WcCallback seg faults )
Message-ID: <14109@arctic.nprdc.navy.mil>
Date: 12 Apr 91 18:03:53 GMT
Sender: news@nprdc.navy.mil
Reply-To: apple@nprdc.navy.mil (Jim Apple)
Organization: Navy Personnel R&D Center, San Diego
Lines: 170


	I need some help with WcCallback,  I'm trying to use WcCallback
and XtSetValues to update a XmList widget.   But it seg faults
when it gets to the XtSetValues call.  Below is a short example of a
 resource file and the main.c file.

	Configuration: Wcl-1.05 and motif 1.1

Any Help would be great.

Thanks in advance


----------------------

Wcl resource file
------------------
!
!PaperLess Wcl 
!

paperless.wcChildren:			main
paperless.title:	PaperLess


*main.wcConstructor:	XmCreateForm
*main.wcChildren: 	courseList
*main.height:   	500
*main.width:    	750

*courseList.wcTrace: 	True
*courseList.wcConstructor:	XmCreateScrolledList
*courseList.wcCallback:		CreateCourseListCB( )
*courseListSW.leftAttachment: 	ATTACH_FORM
*courseListSW.rightAttachment: 	ATTACH_FORM
*courseListSW.topAttachment: 	ATTACH_POSITION
*courseListSW.topPosition:	6

	  

main.c   CreateCourseListCB() is at the end of the file
-------

#include <Xm/Xm.h>
#include <ctype.h>
#include <X11/Wc/WcCreate.h>

#include <X11/Xmp/Table.h>

#define MAX_ARGS 50

void CreateCourseListCB();

extern void MriRegisterMotif();

static void RegisterTable ( app )
XtAppContext app;
{
  
#define RCN( name, class ) WcRegisterClassName ( app, name, class );
#define RCP( name, class ) WcRegisterClassPtr  ( app, name, class );
  
  /* -- register widget classes */
  RCN( "Table",                       tableWidgetClass                );
  RCP( "tableWidgetClass",            tableWidgetClass                );
}


/* as defined in the resource file */

Widget courseList;


/******************************************************************************
 *   MAIN function
 ******************************************************************************/

main ( argc, argv )
     int argc;
     char* argv[];
{   
  char*        appClass;
  XtAppContext app;
  Widget       appShell;
  
  appClass = (char*) XtMalloc ( strlen ( argv[0] ) + 1 );
  strcpy (appClass, argv[0]);
  /* initialize first letter to make class, or first two if
   ** first is already capitalized, or don't worry about it.
   */
  if (islower(appClass[0]))
    appClass[0] = toupper(appClass[0]);
  else if (islower(appClass[1]))
    appClass[1] = toupper(appClass[1]);
  
  /*  -- Intialize Toolkit creating the application shell */
  appShell = XtInitialize ( 
			   argv[0], appClass,		/* app name and class */
			   NULL, 0, 			/* description of cmd line options */
			   &argc, argv 
			   );
  app = XtWidgetToApplicationContext(appShell);
  
  /*  -- Register all application specific callbacks and widget classes */
  RegisterTable ( app );
  
  
  /* register CreateCourseListCB */
  
  WcRegisterCallback(app, "CreateCourseListCB", CreateCourseListCB, NULL);
  
  
  /*  -- Register all Motif classes and constructors */
  MriRegisterMotif ( app );
  
  
  /*  -- Create widget tree below toplevel shell using Xrm database */
  WcWidgetCreation ( appShell );
  
  /*  -- Realize the widget tree and enter the main application loop */
  XtRealizeWidget ( appShell );
  XtMainLoop ( );
}



/*****************************************************************************
  
  CreateCourseList()
  
  *****************************************************************************/

void 	CreateCourseListCB( w, ignored, unused)
     Widget w;
     caddr_t  ignored;
     caddr_t  unused;
{  
  
  
  
  Arg             args[MAX_ARGS];
  int             argn = 0;
  int i = 0;
  
  XmString courses[5];
  
  
  static char *course_list_items[3] = 
    {
      "C 102-2001 test",
      "A 101-1001 test",
      "B 102-2001 test",
    };
  
  
  for(i = 0; i < 3; i++)
    {
      courses[i] = (XmString )XmStringCreateLtoR(course_list_items[i],XmSTRING_DEFAULT_CHARSET);
    }
  
  XtSetArg(args[argn], XmNitems, (XtArgVal) courses);  argn++;
  XtSetArg(args[argn], XmNitemCount, (XtArgVal) 3 );  argn++;
  
  XtSetValues(courseList,args,argn);
  
  
}

	Jim Apple 			apple@nprdc.navy.mil
	WB1DOG				...}ucsd!nprdc!apple