Graphics::FromHwnd Method
Creates a new Graphics from the specified handle to a window.
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- hwnd
- Type: System::IntPtr
Handle to a window.
Return Value
Type: System.Drawing::GraphicsThis method returns a new Graphics for the specified window handle.
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.
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.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.