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From: kenm@dmssyd.syd.dms.CSIRO.AU (Ken McNamara)
Newsgroups: comp.sys.dec
Subject: Using a non-default Visual on a DECSTATION 5000/200 (Help)
Keywords: Visual , DEC
Message-ID: <1991Feb21.214838.16052@syd.dms.CSIRO.AU>
Date: 21 Feb 91 21:48:38 GMT
Sender: news@syd.dms.CSIRO.AU
Reply-To: kenm@dmssyd.syd.dms.CSIRO.AU (Ken McNamara)
Organization: CSIRO Division of Mathematics and Statistics
Lines: 196

I've written a small programme  in attempt to create
a widget with a window which is not of the default visual type.
The code was written, compiled and run on a Sun 4/110 under SunOS 4.1.
It  doesn't bomb when the display is a Sun 4 running the MIT sample
X server  or a DECSTATION5000/200 with an 8 bit display running the 
DECWINDOWS DigitalEquipmentCorporation UWS2.2 server but it does bomb
on a DECSTATION5000/200 running the UWS2.2 X-server  with the following message

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  1 (X_CreateWindow)
  Minor opcode of failed request:  0
  Resource id in failed request:  0x80071
  Serial number of failed request:  270
  Current serial number in output stream:  279

I was just wondering if anyone has experienced this problem ?

The programme is :
-------------------------------------------------------------------------------



#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <X11/Xaw/Label.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <X11/Xatom.h>
#include <X11/Xmu/StdCmap.h>






static char *vis_class[6]; /* A table of Visual class names */


/* Routine to display a XVisulaInfo structure */

static  void show_visual(vis)
     XVisualInfo vis ;
{
    int class;
    printf ("depth = %d\n",vis.depth);
    class = vis.class;
    if (class >= 6) exit(1);
    printf("Visual Id = %#x \n",vis.visualid);
    printf ("class = %s\n",vis_class[class]);
    printf ("R mask = %#x \n",vis.red_mask);
    printf ("G mask = %#x \n",vis.green_mask);
    printf ("B mask = %#x \n",vis.blue_mask);
    printf ("colormap size = %d\n",vis.colormap_size);
    printf ("bits per rgb = %d\n",vis.bits_per_rgb);
    printf ("\n");
}










main(argc,argv)
int argc;
char ** argv;
{
    Widget shell;
    Widget box;
    Colormap Col1 ;
    XtAppContext app_context;
    Display * displ ;
    XVisualInfo Vis;
    Window w;
    Screen * scr;
    XColor col;
    int i,count;


    /* Initialise table of Visual class names */

    vis_class[GrayScale] = "GrayScale";
    vis_class[StaticGray] = "StaticGray";
    vis_class[PseudoColor] = "PseudoColor";
    vis_class[StaticColor] = "StaticColor";
    vis_class[DirectColor] = "DirectColor";
    vis_class[TrueColor] = "TrueColor" ;

    
    /* Do Xt stuff */ 
      
    XtToolkitInitialize();

    app_context = XtCreateApplicationContext();

    /* Get display connection */

    displ = XtOpenDisplay(app_context,"","Freddy","TESTS",
			  NULL,0,&argc,argv);

    scr = DefaultScreenOfDisplay(displ);

    w = RootWindow(displ,DefaultScreen(displ));
    
    i =XMatchVisualInfo(displ,DefaultScreen(displ),8,GrayScale,&Vis);

    printf("%d \n",i);
    if ( !i ) exit (0); /* Failed - exit without further comment */

    show_visual(Vis); /* Display the XVisualInfo returned */

    Col1 = XCreateColormap(displ,w,Vis.visual,
			   AllocAll); /* Create the colormap */


    printf("%#x \n",Col1);

/* This is just a bit of nonsense to check that the coloramp is 
   installed  - when we enter the window the screen changes color */

            for ( count=0; count<Vis.colormap_size; count++)
   {
	col.green = 65000 ; col.red =65000 ; col.blue = 65000; 
	col.pixel = count;
	col.flags = DoGreen | DoBlue | DoRed;
	
	XStoreColor(displ,Col1,&col);
    }; 


    /* Create a shell using the recently created colormap
       and the Visual */

    shell = XtVaAppCreateShell("Freddy","TESTS",topLevelShellWidgetClass,
			       displ,
			      XtNvisual,(XtArgVal)Vis.visual, 
			      XtNwidth,(XtArgVal)100,
			      XtNheight,(XtArgVal)100,
			      XtNcolormap,(XtArgVal)Col1, 
			      NULL);


    /* Create a label widget */

    box = XtVaCreateManagedWidget("MyLabel",labelWidgetClass,shell,
 				  XtNlabel,(XtArgVal)"Hello",
				  NULL);


    XtRealizeWidget(shell); /* Create the windows */

    XtAppMainLoop(app_context); /* The Main Events */
}

------------------------------------------------------------------------
---------
The complete output is:

1
depth = 8
Visual Id = 0x80065
class = GrayScale
R mask = 0
G mask = 0
B mask = 0
colormap size = 256
bits per rgb = 8

0x900001
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  1 (X_CreateWindow)
  Minor opcode of failed request:  0
  Resource id in failed request:  0x80071
  Serial number of failed request:  270
  Current serial number in output stream:  279





--------------------------------
  Ken McNamara
  Phone:    +61-2-4137063  (GMT+10)
  Fax:      +61-2-4169317
  Internet: kenm@syd.dms.csiro.au
                                  
CSIRO Division of Mathematics & Statistics
PO Box 218, Lindfield, NSW 2070, Australia.



                  


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