The SaveDC function saves the current state of the specified device context (DC) by copying data describing selected objects and graphic modes (such as the bitmap, brush, palette, font, pen, region, drawing mode, and mapping mode) to a context stack.
// handle of device context
If the function succeeds, the return value identifies the saved device context.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
The SaveDC function can be used any number of times to save any number of instances of the device contextís state.
A saved state can later be restored by using the RestoreDC function.
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