Path: utzoo!attcan!uunet!snorkelwacker!bloom-beacon!ti-csl.csc.ti.COM!ekberg
From: ekberg@ti-csl.csc.ti.COM
Newsgroups: comp.windows.x
Subject: Re: Bad pixmaps
Message-ID: <9003201516.AA10589@osage.csc.ti.com>
Date: 20 Mar 90 15:16:25 GMT
Sender: ekberg@osage.csc.ti.com
Organization: The Internet
Lines: 20


 >  Our application allocates and uses pixmaps, but looses its connection
 > to the server because of invalid Pixmap values.  The number of pixmaps
 > that we can allocate seems to be dependent on the server on which the
 > application is running.  Is there anyway of knowing when the Pixmap
 > value returned by the server is valid?

The server doesn't return anything upon successful completion of the
CreatePixmap request.  It is the client side of the network that generates the
pixmap ID.  You don't see this happening because Xlib does it for you.  You
will get an invalid pixmap ID error (e.g. a Drawable error) when using an ID
that hasn't been returned from the XCreatePixmap function.  This error can also
be generated when a pixmap is freed by the FreePixmap request and then used
anyway, for example in a drawing request.  The FreePixmap request will be
successful, but the drawing request will generate a Drawable error.

I have had the latter error in C++ when a destructor is run `for me' to destroy
something and then I try and use it anyway.

  -- tom (aisle C-4Q), ekberg@csc.ti.com