Graphics::FromHwnd Method (IntPtr)

 
System_CAPS_noteNote

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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 theDispose 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 PaintEventArgse, 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.

public:
   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( gcnew Pen( Color::Red,3.0f ), 0, 0, 200, 100 );

      // Dispose of new graphics.
      delete newGraphics;
   }

SecurityPermission

for access to unmanaged code. Related enumeration: UnmanagedCode.

.NET Framework
Available since 1.1
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