The CreateRoundRectRgn function creates a rectangular region with rounded corners.
HRGN CreateRoundRectRgn(
int nLeftRect, // x-coordinate of the region's upper-left corner
int nTopRect, // y-coordinate of the region's upper-left corner
int nRightRect, // x-coordinate of the region's lower-right corner
int nBottomRect, // y-coordinate of the region's lower-right corner
int nWidthEllipse, // height of ellipse for rounded corners
int nHeightEllipse // width of ellipse for rounded corners
);
If the function succeeds, the return value is the handle to the region.
If the function fails, the return value is NULL.
Windows NT: To get extended error information, call GetLastError.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in wingdi.h.
Import Library: Use gdi32.lib.
Regions Overview, Region Functions, CreateRectRgn, CreateRectRgnIndirect, DeleteObject, SelectObject