X windows programming how do i start

a1ex_007 · 03-10-2005, 03:21 AM

I have been trying to start working on X windows programming, but have been facing a problem at the beginning. can anybody help ? I could get the libraries linked

here is the first code that i tried

graphics.c

#include<X11/Intrinsic.h>
#include<Xm/Xm.h>
#include<Xm/BulletinB.h>
#include<Xm/PushB.h>

Display *display;
XtAppContext context;
Widget toplevel,manager,exit_button;

int ExitCallback( Widget w, Xt_pointer client_data, XtPointer call_data );

main(int argc, char **argv){

XtToolkitInitialize();
context = XtOpenDisplay( context, "", "hello", "Hello", NULL, 0, &argc, &argv );

toplevel = XtAppCreateShell( "hello", "Hello", applicationShellWidgetClass, display, NULL,0 );

manager = XtCreateWidget( "manager", XmBulletinBoardWidgetClass, toplevel, NULL, 0 );

exit_button = XtCreateWidget( "Exit Button", XmPushButtonWidgetClass, manager, NULL,0);

XtAddCallback( exit_button, XmNactivateCallback, ExitCallback, NULL);

XtManageChild(exit_button);
XtManageChild(manager);
XtRealizeWidget(toplevel);

XtAppMainLoop(context);

}

int ExitCallback(Widget w, Xt_pointer client_data, XtPointer call_data){
exit(0);
}

and it would not compile, the error mesg ----

graphics.c:11: error: syntax error before "Xt_pointer"
graphics.c: In function `main':
graphics.c:16: warning: passing arg 8 of `XtOpenDisplay' from incompatible pointer type
graphics.c:16: warning: assignment from incompatible pointer type
graphics.c:20: error: syntax error before "XmBulletinBoardWidgetClass"
graphics.c:22: error: syntax error before "XmPushButtonWidgetClass"
graphics.c:24: warning: passing arg 3 of `XtAddCallback' from incompatible pointer type
graphics.c: At top level:
graphics.c:36: error: syntax error before "Xt_pointer"

keefaz · 03-10-2005, 08:55 AM

I made some modifications in your code :

Code:

#include<X11/Intrinsic.h>
#include<Xm/Xm.h>
#include<Xm/BulletinB.h>
#include<Xm/PushB.h>

Display *display;
XtAppContext context;
Widget toplevel,manager,exit_button;


void ExitCallback( Widget w, XtPointer client_data, XtPointer call_data );

int main(int argc, char **argv){

    XtToolkitInitialize();
    context = XtCreateApplicationContext();
    display = XtOpenDisplay( context, "", "hello", "Hello", NULL, 0, &argc, argv );

    toplevel = XtAppCreateShell( "hello", "Hello", applicationShellWidgetClass, display, NULL,0 );

    manager = XtCreateWidget( "manager", xmBulletinBoardWidgetClass, toplevel, NULL, 0 );

    exit_button = XtCreateWidget( "Exit Button", xmPushButtonWidgetClass, manager, NULL,0);

    XtAddCallback( exit_button,  XmNactivateCallback,  ExitCallback, NULL);

    XtManageChild(exit_button);
    XtManageChild(manager);
    XtRealizeWidget(toplevel);

    XtAppMainLoop(context);
    return 0;
}

void ExitCallback(Widget w, XtPointer client_data, XtPointer call_data){
    exit(0);
}

compile with something like :
gcc -o graphics graphics.c -L/usr/X11R6/lib -lXm -lXt -lX11 -I/usr/X11R6/include

a1ex_007 · 03-11-2005, 12:15 AM

i tried the code but its still give me an error ..........

[root@buzz ~]# gcc -o graphics graphics.c -L/usr/X11R6/lib -lXm -lXt -lX11 -I/usr/X11R6/include

graphics.c:10: error: syntax error before "Xt_pointer"
graphics.c: In function `main':
graphics.c:18: warning: passing arg 8 of `XtOpenDisplay' from incompatible pointer type
graphics.c:26: warning: passing arg 3 of `XtAddCallback' from incompatible pointer type

keefaz · 03-11-2005, 07:53 AM

Just copy and paste my modified code and try to compile it as I already did the changes
to fix those errors