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!
