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Re: Can a CALL_EXTERNAL .dll create a window? [message #36299 is a reply to message #36297]

Fri, 29 August 2003 12:21

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"Matt Feinstein" wrote in message...

> I'm trying to write a CALL_EXTERNAL .dll that does off-screen
> hardware-assisted OpenGL rendering. My first try crashes IDL pretty
> much immediately, so I'm trying to eliminate possibilites for bugs.
> This tends to be difficult, since you can't run a .dll by itself... &
> it would be good if I could get some help in focussing my efforts on
> likely suspects.

Can I ask why you are doing your own GL rendering? I have toyed with this
idea but I haven't been able to justify the effort.

> The first suspect I can think of is that I have to create a Win32
> window in the .dll. The reason I have to do this is that to get an
> off-screen hardware assisted rendering context one -has- to begin with
> an on-screen hardware assisted rendering context, which, in turn,
> means that you have to create a window. Is there a fatal difficulty in
> doing this in an IDL CALL_EXTERNAL .dll? Or, better, is there some
> combination of window properties that make it OK?

I hope someone from RSI will answer your question since few if any of us on
the list can answer this one.

I would take a stab that yes, you can create windows. Have you tried simply
creating a window and destroying it? Write a main routine for this test
function so you can run it as an .exe to make sure you are setting your
calls up correctly. Then take it a step at a time.

Also, why not a DLM?

-Rick

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[Message index]

		Re: Can a CALL_EXTERNAL .dll create a window? By: Karl Schultz on Wed, 03 September 2003 09:03
		Re: Can a CALL_EXTERNAL .dll create a window? By: Matt Feinstein on Sat, 30 August 2003 04:39
		Re: Can a CALL_EXTERNAL .dll create a window? By: Rick Towler on Fri, 29 August 2003 14:56
		Re: Can a CALL_EXTERNAL .dll create a window? By: Karl Schultz on Fri, 29 August 2003 14:23
		Re: Can a CALL_EXTERNAL .dll create a window? By: Matt Feinstein on Fri, 29 August 2003 13:33
		Re: Can a CALL_EXTERNAL .dll create a window? By: Rick Towler on Fri, 29 August 2003 12:21

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