SetWindowExtEx info Overview Group

The SetWindowExtEx function sets the horizontal and vertical extents of the window for a device context by using the specified values.

BOOL SetWindowExtEx(

HDC hdc,	// handle of device context
int nXExtent,	// new horizontal window extent
int nYExtent,	// new vertical window extent
LPSIZE lpSize	// original window extent
);

Parameters

hdc: Identifies the device context.
nXExtent: Specifies the window’s horizontal extent in logical units.
nYExtent: Specifies the window’s vertical extent in logical units.
lpSize: Points to a SIZE structure. The previous window extents (in logical units) are placed in this structure. If lpSize is NULL, nothing is returned.

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

When the following mapping modes are set, calls to the SetWindowExtEx and SetViewportExtEx functions are ignored:

When MM_ISOTROPIC mode is set, an application must call the SetWindowExtEx function before calling SetViewportExtEx.