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Problem with routine!

 [1/7] from: amicom::sonic::net at: 9-Mar-2005 4:44


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 *); Any ideas you can give would be greatly appreciated! -Bo

 [2/7] from: jca::miranda::gmail::com at: 9-Mar-2005 14:47


what happens if you use this : res: grabframe "Test" my-int: make struct! [p [integer!]] Does it work better? Not sure this is your problem, but well, just trying to guess. :) @+ Bouba On Wed, 09 Mar 2005 04:44:48 -0800, Bohdan or Rosemary Lechnowsky <[amicom--sonic--net]> wrote:

 [3/7] from: jca:miranda:gm:ail at: 9-Mar-2005 15:37


woops I made a mistake : u should have read : res: grabframe "Test" my-int: make struct! [p [integer!]] none Sorry. On Wed, 9 Mar 2005 14:47:14 +0100, bouba <[jca--miranda--gmail--com]> wrote:

 [4/7] from: amicom:sonic at: 9-Mar-2005 9:11


OK, changed to this: grabframe: make routine! [ "Grab a video frame" t1 [string!] addr [struct! [i [integer!]]] return: [string!] ] tfcapture "grabFrame" a: make struct! [i [integer!]] none grabframe "This is me" a Same problem with the message "Rebol has generated errors" Any other ideas? -Bo At 06:37 AM 3/9/2005, you wrote:

 [5/7] 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
<<quoted lines omitted: 25>>
> 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
<<quoted lines omitted: 5>>
> To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject.
-- -Volker Any problem in computer science can be solved with another layer of indirection. But that usually will create another problem. David Wheeler

 [6/7] from: SQLAB::gmx::net at: 10-Mar-2005 10:06


What happens if you do change it to grabframe: make routine! [ "Grab a video frame" t1 [string!] addr [struct! [i [integer!]]] return: [integer!] ] tfcapture "grabFrame" a: make struct! [i [integer!]] none grabframe "This is me" a 1 ? AR Bohdan or Rosemary Lechnowsky wrote:

 [7/7] from: robert::muench::robertmuench::de at: 10-Mar-2005 19:01


On Wed, 09 Mar 2005 09:11:14 -0800, Bohdan or Rosemary Lechnowsky <[amicom--sonic--net]> wrote:
> Same problem with the message "Rebol has generated errors"
Sounds like the write-back is the problem. The routine will change the framesize parameter and I expect, that the Rebol parameter can't be written too (which indicates that you are not calling the C function with the address of the variable taking the result). Maybe I'm not telling something new... Robert

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