C# Signature:

[DllImport("gdi32.dll")]
static extern bool FillRgn(IntPtr hdc, IntPtr hrgn, IntPtr hbr);

User-Defined Types:

None.

Notes:

Its probably easier to use the graphics functions in .net to do this for you.

Ie. Graphics.FromHdc(...).FillRegion( ..., ...)

Tips & Tricks:

Please add some!

Sample Code test:

// 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:

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