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Graphics.FromHdc Method
.NET Framework 1.1
Creates a new Graphics object from the specified handle to a device context.
Overload List
Creates a new Graphics object from the specified handle to a device context.
[Visual Basic] Overloads Public Shared Function FromHdc(IntPtr) As Graphics
[C#] public static Graphics FromHdc(IntPtr);
[C++] public: static Graphics* FromHdc(IntPtr);
[JScript] public static function FromHdc(IntPtr) : Graphics;
Creates a new Graphics object from the specified handle to a device context and handle to a device.
[Visual Basic] Overloads Public Shared Function FromHdc(IntPtr, IntPtr) As Graphics
[C#] public static Graphics FromHdc(IntPtr, IntPtr);
[C++] public: static Graphics* FromHdc(IntPtr, IntPtr);
[JScript] public static function FromHdc(IntPtr, IntPtr) : Graphics;
Example
[Visual Basic, C#] The following example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following action:
- Creates an internal pointer type variable hdc and sets it to the handle to the device context of the graphics object of the form.
- Creates a new graphics object using hdc.
- Draws a rectangle with the new graphics object (on the screen).
- Releases the new graphics object using hdc.
[Visual Basic, C#] Note This example shows how to use one of the overloaded versions of FromHdc. For other examples that might be available, see the individual overload topics.
[Visual Basic] Public Sub FromHdcHdc(e As PaintEventArgs) ' Get handle to device context. Dim hdc As IntPtr = e.Graphics.GetHdc() ' Create new graphics object using handle to device context. Dim newGraphics As Graphics = Graphics.FromHdc(hdc) ' Draw rectangle to screen. newGraphics.DrawRectangle(New Pen(Color.Red, 3), 0, 0, 200, 100) ' Release handle to device context. e.Graphics.ReleaseHdc(hdc) End Sub [C#] public void FromHdcHdc(PaintEventArgs e) { // Get handle to device context. IntPtr hdc = e.Graphics.GetHdc(); // Create new graphics object using handle to device context. Graphics newGraphics = Graphics.FromHdc(hdc); // Draw rectangle to screen. newGraphics.DrawRectangle(new Pen(Color.Red, 3), 0, 0, 200, 100); // Release handle to device context. e.Graphics.ReleaseHdc(hdc); }
[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button
in the upper-left corner of the page.
See Also
Graphics Class | Graphics Members | System.Drawing Namespace
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