My program was working fine until I updated it to the Directx7 interface. Now it refuses to blt and just shuts down and I can''t figure out why.

Here is the code. And in txt format.

Anyone?

Are you getting an assertion failure for your sprite''s surface?

Actually I got to thinking about it more. I was having the same problem. For sanity''s sake, test all of your DD calls like this:

if ( FAILED( lpDD->CreateSurface( &ddsd2,&lpDDSPrimary,NULL ) ) )
{
return Fail( hWnd, "Couldn''t create primary surface.\n" );
}

BOOL App::Fail( HWND hwnd, char *szMsg )
{
ReleaseObjects();
OutputDebugString( szMsg );
DestroyWindow( hwnd );
return FALSE;
}

Run every thing from the debugger to get the OutputDebugString( szMsg ) output in your debug window(VC6).

If you find that the error is that one of the surfaces is not being created, most likely the case, I think you''ll need to change your ddsd settings. The requirements seem to be a little different for dx7. In the MSSDK7 documents C:\MSSDK7\doc\DirectX7\Word in the ddraw.doc file page 44 describes the requirements. Use this as a template and experiment til it works. Remember to tweek this for all surfaces you create. Oh yeah, either memset the ddsd to all 0 or use a new one for each surface. Here''s what''s working for me:

DDSURFACEDESC2 ddsd2;
#define WIDTH 800 // in pixels
#define HEIGHT 600
#define DEPTH 3 // in bytes (3bytes == 24 bits)

LPVOID lpSurface = NULL;
HLOCAL hMemHandle = NULL;


ZeroMemory(&ddsd2, sizeof(DDSURFACEDESC2));
ZeroMemory(&ddsd2.ddpfPixelFormat, sizeof(DDPIXELFORMAT));
ddsd2.dwSize = sizeof(ddsd2);
ddsd2.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
ddsd2.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_FLIP | DDSCAPS_COMPLEX | DDSCAPS_VIDEOMEMORY;
ddsd2.dwWidth = WIDTH;
ddsd2.dwHeight= HEIGHT;
ddsd2.lPitch = (LONG)DEPTH * WIDTH;
ddsd2.lpSurface = lpSurface;
ddsd2.dwBackBufferCount = 1;

if ( FAILED( lpDD->CreateSurface( &ddsd2,&lpDDSPrimary,NULL ) ) )
{
return Fail( hWnd, "Couldn''t create primary surface.\n" );
}

and then for a sprite surface...

DDSURFACEDESC2 ddsd2;
#define DEPTH 3 // in bytes (3bytes == 24 bits)
LPVOID lpSurface = NULL;
HLOCAL hMemHandle = NULL;


ZeroMemory(&ddsd2, sizeof(DDSURFACEDESC2));
ZeroMemory(&ddsd2.ddpfPixelFormat, sizeof(DDPIXELFORMAT));
ddsd2.dwSize = sizeof(ddsd2);
ddsd2.dwFlags = DDSD_CAPS | DDSD_HEIGHT |
DDSD_WIDTH | DDSD_CKSRCBLT;

ddsd2.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;

ddsd2.dwWidth = m_nImageWidth;
ddsd2.dwHeight= m_nImageHeight;
ddsd2.lPitch = (LONG)DEPTH * m_nImageWidth;
ddsd2.lpSurface = lpSurface;

if ( FAILED( lpDD->CreateSurface( &ddsd2, ℑ, NULL ) ) )
{
return Fail( "Couldn''t create off-screen surface.\n" );
}