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From: andrew@ee.su.oz.au (Andrew Ho)
Newsgroups: comp.windows.x
Subject: Standard Colormap
Message-ID: <1991Jan15.030705.22252@metro.ucc.su.OZ.AU>
Date: 15 Jan 91 03:07:05 GMT
Sender: news@metro.ucc.su.OZ.AU
Reply-To: andrew@ee.su.oz.au (Andrew Ho)
Organization: Electrical Engineering, The University of Sydney, Australia
Lines: 50
Nntp-Posting-Host: 129.78.13.35

Hi,

  I am writing an image processing progm which requires
using a standard colormap. However, it seems to me that
the standard colormap cannot be created. The following is
my sample codes. Can anyone help me to find out what's
wrong ? 

  Thanks for any pointers.

andrew@ee.su.oz.au

/****************************************************/
#include <stdio.h>
#include <X11/Xatom.h>
#include <X11/X.h>
#include <X11/StringDefs.h>
#include <X11/Intrinsic.h>
#include <Xw/Form.h>

Widget  top;
Widget  form;

XStandardColormap std_colormap;

main(argc, argv)
   int argc;
   char **argv;
{
    Arg  wargs[3];
    int j;

    top=XtInitialize(argv[0], "top", NULL, 0, &argc, argv);

    j=0;
    XtSetArg(wargs[j], XtNwidth, 50); j++;
    XtSetArg(wargs[j], XtNheight, 50); j++;
    form= XtCreateManagedWidget("form", XwformWidgetClass, top, wargs, j);

    XtRealizeWidget(top);

    if (XGetStandardColormap(XtDisplay(top), RootWindow(XtDisplay(top),
        DefaultScreen(XtDisplay(top))),
        &std_colormap, XA_RGB_DEFAULT_MAP) == 0)
       {
           printf("Cannot create std colormap\n");
       }
    
    XtMainLoop();
}