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Retrieves the default memory device context (DC).
virtual HDC GetMemoryHDC( );
Return Values
Returns the default memory DC.
Remarks
The base window class creates a window with a worker thread when it is prepared (in CBaseWindow::PrepareWindow). It also creates two DCs that can be used for drawing. The first is a normal window handle to a device context (HDC); the second is an offscreen HDC that can be used as a source HDC in bit-block transfer functions.