[REBOL] Re: Problem with routine!
From: volker::nitsch::gmail::com at: 9-Mar-2005 18:36
On Wed, 09 Mar 2005 04:44:48 -0800, Bohdan or Rosemary Lechnowsky
<[amicom--sonic--net]> wrote:
> OK. I finally made some progress on my video capture .dll stuff, but I'm
> stuck again. Here is the C++ code that works properly calling the routine
> "grabframe":
>
> char *pFrame = NULL;
> long frameSize;
> HANDLE h;
> char *fn = new char[256];
> char *pTyped;
> long frameSizeTyped;
> DWORD bytesWritten;
> LPDWORD pBytesWritten = &bytesWritten;
> pFrame = grabFrame("This is me", &frameSize);
>
> I think this can safely be whittled down to the following for this example:
>
> char *pFrame = NULL;
> long frameSize;
> pFrame = grabFrame("This is me", &frameSize);
>
> Here is my grabframe routine in Rebol:
>
> grabframe: make routine! [
> "Grab a video frame"
> t1 [string!]
> addr [integer!]
> return: [string!]
> ] tfcapture "grabFrame"
>
> If I try to call it with the following, Windows says Rebol generated an
> illegal operation:
>
> adrs: 0
> res: grabframe "Test" adrs
>
> Here is the grabframe declaration in the .h file if this helps any:
>
> extern "C" __declspec(dllexport) char *grabFrame(CString, long *);
>
What is a CString? Is it a MS-class with pointer, length and such
stuff, not just a char* ? Can you look into that from a c-debugger?
> Any ideas you can give would be greatly appreciated!
>
> -Bo
>
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--
-Volker
Any problem in computer science can be solved with another layer of
indirection. But that usually will create another problem.
David
Wheeler
