Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!cbmvax!vu-vlsi!daniel
From: daniel@vu-vlsi.Villanova.EDU (Daniel C. Gnanaprakasam)
Newsgroups: comp.windows.x
Subject: Beginner's prblem with widgets
Keywords: widgets, toolkit
Message-ID: <2200@vu-vlsi.Villanova.EDU>
Date: 15 Feb 89 00:47:15 GMT
Organization: Villanova Univ. EE Dept.
Lines: 68

I am a novice user of X toolkit and I am having problems getting my first
program to work.  The X11 R2 server is running on a Sun 3/50 under 4.0 OS.  The
program I tried was the one given in the paper titled "Using the X Toolkit or
How to Write a Widget", by Joel McCormack and Paul Asente. ( Usenix Conference 
Summer 1988 ).  

The following is the program I tried.

/** ------------------------------------------------------- */

#include <X11/Xatom.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Form.h>
#include <X11/Label.h>
#include <X11/Command.h>

void Callback(widget,clientData,callData)
     Widget widget;
     caddr_t clientData, callData;
{
  (void) printf("Goodbye, cruel world \n");
  exit(0);
}

int main(argc,argv)
     unsigned int argc;
     char **argv;
{
  Widget toplevel,box,label,command;
  Arg arg[25];
  unsigned int n;

  toplevel = XtInitialize("goodbye","Goodbye",NULL,0,&argc,argv);

  box = XtCreateManagedWidget("box",formWidgetClass,toplevel,(Arg *)NULL,0);

  n=0;
  XtSetArg(arg[n],XtNx,10);                n++;
  XtSetArg(arg[n],XtNy,10);                n++; 
  XtSetArg(arg[n],XtNlabel,"Goodbye world"); n++;
  label = XtCreateManagedWidget("label",labelWidgetClass,box,arg,n);

  n=0;
  XtSetArg(arg[n],XtNx,50);                  n++;
  XtSetArg(arg[n],XtNy,40);                  n++; 
  XtSetArg(arg[n],XtNlabel,"Click and die"); n++;
  command = XtCreateManagedWidget("command",commandWidgetClass,box,arg,n);
  XtAddCallback(command,XtNcallback,Callback,NULL);

  XtRealizeWidget(toplevel);
  XtMainLoop();

}

/** ------------------------------------------------------ **/

I compiled and linked by 

cc -o xtk xtk.c -lXaw -lXt -lX

When I run it, only the label widget with the label "Goodbye label" appears
on the display.  


Thanks for the help

daniel