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If you want to modify the contents of a DirectDraw surface object by using GDI functions, you must retrieve a GDI-compatible device context handle. This could be useful if you wanted to display text in a DirectDraw surface by calling the DrawTextWin32 function, which accepts a handle to a device context as a parameter. It is possible to retrieve a GDI-compatible device context for a surface by calling the IDirectDrawSurface5::GetDCmethod for that surface. The following example shows how this might be done:
// For this example the lpDDS4 variable is a valid pointer // to an IDirectDrawSurface5 interface. HDC hdc; HRESULT HR; hr = lpDDS4->GetDC(&hdc); if(FAILED(hr)) return hr; // Call DrawText, or some other GDI // function here. lpDDS4->ReleaseDC(hdc);
Note that the code calls the IDirectDrawSurface5::ReleaseDCmethod when the surface's device context is no longer needed. This step is required, because the IDirectDrawSurface5::GetDCmethod uses an internal version of the IDirectDrawSurface5::Lockmethod to lock the surface. The surface remains locked until the IDirectDrawSurface5::ReleaseDCmethod is called.
Last updated on Tuesday, May 18, 2004