PtInRegion function (wingdi.h)

The PtInRegion function determines whether the specified point is inside the specified region.

Syntax

BOOL PtInRegion(
  [in] HRGN hrgn,
  [in] int  x,
  [in] int  y
);

[in] hrgn

Handle to the region to be examined.

[in] x

Specifies the x-coordinate of the point in logical units.

[in] y

Specifies the y-coordinate of the point in logical units.

If the specified point is in the region, the return value is nonzero.

If the specified point is not in the region, the return value is zero.

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wingdi.h (include Windows.h)
Library	Gdi32.lib
DLL	Gdi32.dll