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DirectX Lock Problem

Started by lshadow Mar 23, 2000 at 11:40 PM 3 replies 750+ views

Original Post

Mar 23, 2000 at 11:40 PM

I''m trying to lock a surface so I can load a bitmap onto it, but each time I run the program it fails right after the lock. I thought their might be an error, so I checked the lock for return values and it gave me DD_OK. So I''m wondering how can I have DD_OK and a program error? Oh, I''ve been getting this error every time I try to lock the surface in a member fuction of a class. Using visual c++ and DirectX 7.

Spellbound

Mar 24, 2000 at 12:05 AM

What call is it that fails?

CGameProgrammer

179

CGameProgrammer

Mar 24, 2000 at 12:23 AM

Just in case you''re not doing it right:


HRESULT hrValue;
DDSURFACEDESC DDSurfDesc;

ZeroMemory( &DDSurfDesc, sizeof DDSurfDesc );
DDSurfDesc.dwSize = sizeof DDSurfDesc;

hrValue = lpSurface->Lock( NULL, &DDSurfDesc, DDLOCK_WAIT, NULL );

Otherwise, I have no idea what can be causing that problem.

~CGameProgrammer( );

Mar 24, 2000 at 1:39 AM

As CGameProgrammer stated, you MUST clear the DDSURFACEDESC structure, and set dwSize to sizeof(DDSURFACEDESC). If you fail to do this, not only will it not work, but the Lock() function misleading returns DD_OK.

lshadow

Author

lshadow

Mar 24, 2000 at 6:24 PM

Actually found that the error was after the Lock. When locking the surface, no debug strings could be output, so I found my error after commenting out certain portions of the code. Code is in topic - DirectX Mysteries

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