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Re: [NSWindow _initBackendWindow] segmentation fault ...

From: Fred Kiefer
Subject: Re: [NSWindow _initBackendWindow] segmentation fault ...
Date: Sun, 27 Feb 2005 20:42:26 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040906

Christophe JALADY wrote:
I've a segmentation fault on:
[NSWindow _initBackendWindow] at NSWindow.m:791

The line in the file is this one:
// Set window in new _gstate

With ddd, I found that "context" is nil (0x0) but it initialised with
that : "NSGraphicsContext *context = GSCurrentContext();".

So what are reason's that GSCurrentContext can return nil ?

To know, my last application call is a [NSImage lockFocus] with an
NSimage wich is init with "initWithSize" and wich respond "false" to
isValid (is it normal?). With the call to "lockFocus" I've the
segmentation fault describe above.

Thank's in advance for your help.


I use the "current release" of GNUStep.
I try both with art and xlib backend but I've the same bug.
My application is a port of a MAC/COCOA to gnustep. It have 2 threads.

Without seeing your code it is hard to tell the reason for the problem. One possibility is that you did not initialize the backend, that is you did not call [NSApplication sharedApplication] one way or the other. Another possibility is that you are making this call from the second thread, the one not used to initialize the backend. GSCurrentContext() gets the context from the current thread, so it will fail when used with a secondardy thread. You may work around this problem by using
[NSObject performSelectorOnMainThread:withObject:waitUntilDone:].


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