Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!mit-eddie!bloom-beacon!SHAMASH.MCRCIM.MCGILL.EDU!mouse
From: mouse@SHAMASH.MCRCIM.MCGILL.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re:  problem with XLoadQueryFont on HPUX machines?
Message-ID: <9009112315.AA07792@shamash.McRCIM.McGill.EDU>
Date: 11 Sep 90 23:15:03 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 48

> I've run into a problem with a very basic program which runs fine on
> a Sun sparcstation running X11.4, but blows up on an HPUX 7.0 machine
> running X11.3.

> All I'm doing is opening a display, creating and setting a tile, then
> when I call XLoadQueryFont ... kaboom!  The error is:

> X Protocol error detected by server:  BadMatch, invalid parameter attributes
>   Failed request major op code 56 (X_ChangeGC)

> The program code follows:

> /* debug (synchronous) X mode switch, non-zero = on */
> #define _Xdebug 1 

This will not do what the comment implies you expect it to do.  _Xdebug
is not a #define but a variable.  You either want

int _Xdebug = 1;

or you want to call XSynchronize().  I am not sure the former works;
_Xdebug appears to me to be intended to be patched by debuggers, not
set by programs.  Calling XSynchronize should work fine.

>     gc = DefaultGC(dpy, screen);
>     tile = XCreateBitmapFromData(dpy, RootWindow(dpy, screen),
>                                  gray_bits, gray_width, gray_height);
>     XSetTile(dpy, gc, tile);

Wait a sec, who says the default GC is only one bit deep?  This
certainly makes a lot more sense as the source of the bogus ChangeGC
protocol request than the XLoadQueryFont below.

>     font_info = XLoadQueryFont(dpy, fontname);

> As I said, it works fine on Sun, but blows up on HP risc machines.  I
> have tried everything I can think of ... any help would be greatly
> appreciated.

Two things, then.  One, are all the Suns 1-bit and the HP more than 1
bit?  Two, did you ever try commenting out *just* the XLoadQueryFont
line and seeing if *that* ever worked on the HP?  If not, don't jump to
the conclusion that it's the line at fault....

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu