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Hi, I have this code in DirectX 9, in which I need to get the DC from a COM interface and draw it. I do get the DC and it contains the image, but I get a black screen. Any ideas why?

C++
LPDIRECT3DSURFACE9 pRenderSurface = NULL, pRenderSurfaceTMP = NULL;

    m_pRenderTexture->GetSurfaceLevel(0, &pRenderSurface);
    if (pRenderSurface == NULL)
        return FALSE;

    m_pD3DDevice->CreateOffscreenPlainSurface(m_nWidth, m_nHeight,
        D3DFMT_X8R8G8B8, D3DPOOL_SYSTEMMEM, &pRenderSurfaceTMP, 0);

    m_pD3DDevice->GetRenderTargetData(pRenderSurface,pRenderSurfaceTMP);

    HDC hDC = NULL;
    hr = pRenderSurfaceTMP->GetDC(&hDC);
    if (FAILED(hr))
        return FALSE;   

    if (m_pViewObject != NULL)
    {
        // RECT is relative to the windowless container rect
        RECTL rcRect = {0, 0, m_nWidth, m_nHeight};  

        // Draw onto the DC!
        hr = m_pViewObject->Draw(DVASPECT_CONTENT, 1,
            NULL, NULL, NULL, hDC, &rcRect, NULL, NULL,
            0);
    }


    pRenderSurface->ReleaseDC(hDC);
    pRenderSurface->Release();


    // Draw the surface
    m_pD3DDevice->SetStreamSource( 0, m_pVertexBuffer, 0, sizeof(Vertex) );
    m_pD3DDevice->SetTexture( 0, m_pRenderTexture );


    hr = m_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);

    m_hbrBackground = NULL;
    pRenderSurfaceTMP->Release();


Thanks in advance,
yakobom
Posted
Comments
SoMad 28-Jun-12 4:30am    
You are only doing the check if(FAILED(hr)) one place. I suggest you perform the same check for all the DD calls that might fail such as CreateOffscreenPlainSurface(), GetRenderTargetData(), SetStreamSource(), etc.
Add an ASSERT or a breakpoint if the return value is one of the failure codes.

Soren Madsen
yakobom 1-Jul-12 2:41am    
Hi,
I just rechecked and I get a D3DERR_INVALIDCALL on GetRenderTargetData (and that's weird, since I am able to get a valid DC from pRenderSurfaceTMP). Any suggestions?

1 solution

Hi SoMad,
Basically you are correct, but I debugged it line by line and everything seemed ok. Plus, I do know I have the picture in the dc (I printed it to a file from hDC).

Do you have any idea what can be wrong?
yakobom
 
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