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CreateRoundRectRgn function

Applies to: desktop apps only

The CreateRoundRectRgn function creates a rectangular region with rounded corners.

Syntax

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HRGN CreateRoundRectRgn(
  __in  int nLeftRect,
  __in  int nTopRect,
  __in  int nRightRect,
  __in  int nBottomRect,
  __in  int nWidthEllipse,
  __in  int nHeightEllipse
);

Parameters

nLeftRect [in]: Specifies the x-coordinate of the upper-left corner of the region in device units.
nTopRect [in]: Specifies the y-coordinate of the upper-left corner of the region in device units.
nRightRect [in]: Specifies the x-coordinate of the lower-right corner of the region in device units.
nBottomRect [in]: Specifies the y-coordinate of the lower-right corner of the region in device units.
nWidthEllipse [in]: Specifies the width of the ellipse used to create the rounded corners in device units.
nHeightEllipse [in]: Specifies the height of the ellipse used to create the rounded corners in device units.

Return value

If the function succeeds, the return value is the handle to the region.

If the function fails, the return value is NULL.

Remarks

When you no longer need the HRGN object call the DeleteObject function to delete it.

Region coordinates are represented as 27-bit signed integers.

Requirements