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FromHwnd Method

Graphics.FromHwnd Method

Creates a new Graphics from the specified handle to a window.

Namespace:  System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

public static Graphics FromHwnd(
	IntPtr hwnd
)

Parameters

hwnd
Type: System.IntPtr

Handle to a window.

Return Value

Type: System.Drawing.Graphics
This method returns a new Graphics for the specified window handle.

You should always call the Dispose method to release the Graphics and related resources created by the FromHwnd method.

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler, as well as thisForm, the Form for the example. The code performs the following actions:

  • Creates a new internal pointer variable hwnd and sets it to the handle of the example's form.

  • Creates a new Graphics from the handle.

  • Draws a rectangle to the new Graphics using a red pen.

  • Disposes the new Graphics.

private void FromHwndHwnd(PaintEventArgs e)
{

    // Get handle to form.
    IntPtr hwnd = this.Handle;

    // Create new graphics object using handle to window.
    Graphics newGraphics = Graphics.FromHwnd(hwnd);

    // Draw rectangle to screen.
    newGraphics.DrawRectangle(new Pen(Color.Red, 3), 0, 0, 200, 100);

    // Dispose of new graphics.
    newGraphics.Dispose();
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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