hello everybody, i'm quite new to directX, i'm simply trying to load a .bmp in a surface, but it gives me back a memory access violation (Null pointer??) here is the code: const wchar_t* path = L"./mcgiver.mbmp"; D3DXIMAGE_INFO Info; D3DXGetImageInfoFromFile(path, &Info); g_pd3dDevice->CreateOffscreenPlainSurface(Info.Width, Info.Height, Info.Format, D3DPOOL_SYSTEMMEM, &Surface, NULL); D3DXLoadSurfaceFromFile(Surface, NULL, NULL, path,NULL, D3DX_FILTER_NONE, 0, NULL); if ( SUCCEEDED (g_pd3dDevice->BeginScene())) { IDirect3DSurface9 *BackBuffer = NULL; g_pd3dDevice->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &BackBuffer); g_pd3dDevice->UpdateSurface(Surface, NULL, BackBuffer, NULL); g_pd3dDevice->EndScene(); } the error is at UpdateSurface(Surface, NULL, BackBuffer, NULL), and i'm sure it's because of the Surface object, but i cant understand why, this is the exact error: Unhandled exception at 0x743b65d0 in DX9GRAPHICS_1.exe: 0xC0000005: Access violation reading location 0x00000000. can u help me? :) thanks in advance

mmm...i'm not sure, i receive only this error and if i debug the code it stops at the UpdateSurface line

ok i'm going to check every function...:)...thanks, i'll let you know later, ciao

ok i've found something...i think.., i added this lines ( i know maybe it's a stupid idea but i'm still learning everything)

if( D3DXGetImageInfoFromFile(path, &Info)!= D3D_OK )
{

int msgboxID = MessageBox(
NULL,
(LPCWSTR)L"something wrong here",
(LPCWSTR)L"Error",
MB_ICONWARNING
);

}

and actually the message box shows up, so at least i have a problem here, maybe something very stupid...like the path?, because i cant figure out something different, thanks again :)

mmm, i've chosen D3D_OK simply because i found this on the msdn website:

Return Values

If the function succeeds, the return value is D3D_OK. If the function fails, the return value can be the following: D3DERR_INVALIDCALL

anyway even with FAILED i have the same result, with the debug runtimes i get :


Direct3D9: (ERROR) :This format is not supported for offscreen plain surfaces. CreateOffscreenPlainSurface fails.
Direct3D9: (ERROR) :NULL surface interface specified. UpdateSurface fails
Direct3D9: (ERROR) :This format is not supported for offscreen plain surfaces. CreateOffscreenPlainSurface fails.
Direct3D9: (ERROR) :NULL surface interface specified. UpdateSurface fails
The program '[1636] DX9GRAPHICS_1.exe: Native' has exited with code 0 (0x0).

also...i'm an idiot.....it couldnt find the picture because i wrote .mbmp instead of .bmp, now the message box doesnt show up, but i still get the same errors

The path you're using is a relative path to the current directory. Just to be sure, try changing your path to a full path including the drive, directories, etc.

For instance, const wchar_t* path = L"c:/projects/myprojects/mcgiver.bmp";