@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The CreateRectRgn API !!!!C# Signature: [DllImport("gdi32.dll")] static extern IntPtr CreateRectRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect); !!!!VB.NET Signature: <DllImport("gdi32.dll")> _ Private Shared Function CreateRectRgn(ByVal nLeftRect As Integer, ByVal nTopRect As Integer, ByVal nRightRect As Integer, ByVal nBottomRect As Integer) As IntPtr End Function !!!!User-Defined Types: None. !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: // Up Top [DllImport("user32.dll",EntryPoint="GetDC")] static extern IntPtr GetDC(IntPtr hWnd); [DllImport("gdi32.dll")] static extern bool FillRgn(IntPtr hdc, IntPtr hrgn, IntPtr hbr); [DllImport("gdi32.dll")] static extern IntPtr CreateRectRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect); [DllImport("gdi32.dll")] static extern IntPtr CreateSolidBrush(uint crColor); [DllImport("gdi32.dll")] static extern bool DeleteObject(IntPtr hObject); // Then whereever: // This paints the current form black IntPtr wDc = GetDC(this.Handle); int mx = Screen.PrimaryScreen.WorkingArea.Width; int my = Screen.PrimaryScreen.WorkingArea.Height; IntPtr brush = CreateSolidBrush(0x0); // black, of format : //0x00bbggrr FillRgn(wDc, CreateRectRgn(0,0,mx,my), brush); DeleteObject(brush); !!!!Alternative Managed API: No managed API. GraphicsPath can be used to create a similar functionality. Do you know one? Please contribute it! Documentation: CreateRectRgn@msdn on MSDN
Edit gdi32.createrectrgn
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