WM_PALETTEISCHANGING  8T9P0FY 

The WM_PALETTEISCHANGING message informs applications that an application is going to realize its logical palette.

WM_PALETTEISCHANGING

hwndRealize = (HWND) wParam; // window to realize palette

Parameters

hwndRealize

Value of wParam. Identifies the window that is going to realize its logical palette.

Return Values

If an application processes this message, it should return zero.

Remarks

The application changing its palette does not wait for acknowledgment of this message before changing the palette and sending the WM_PALETTECHANGED message. As a result, the palette may already be changed by the time an application receives this message.

If the application either ignores or fails to process this message and a second application realizes its palette while the first is using palette indices, there is a strong possibility that the user will see unexpected colors during subsequent drawing operations.

See Also