带椭圆空洞的透明窗体，VB源代码.rar

Purpose Make a form with a hole in it. Method Use CreateRectRgn to make a region that includes the whole form. Use CreateEllipticRgn to create a region in the center. Use CombineRgn to subtract the second region from the first. Then use SetWindowRgn to restrict the form to the resulting region. Disclaimer This example program is provided "as is" with no warranty of any kind. It is intended for demonstration purposes only. In particular, it does no error handling. You can use the example in any form, but please mention www.vb-helper.com.