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GetDC()
Get access to a window for drawing purposes
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Syntax
GetDC( <hWnd> )   -->   hDC

Arguments
<hWnd> is the handle of the window where drawing is to take
place.

Returns
If successful, this function returns a handle to a device
context for the window's client area (the part an application
can draw on).  This handle will be a non-zero numeric.
Otherwise, zero (0) is returned.

Description
Drawing in Windows is done using GDI (graphics device
interface) functions, which require a handle to a device
context.  This function returns a suitable handle for drawing
on the display.  For printing, see the CreateDC() and
GetPrintDC() functions.

Example
// Draw a frame
hDC = GetDC( hWnd )
FrameRect( hDC, 100, 100, 200, 200, hBlueBrush )
ReleaseDC( hWnd, hDC )