Graphics.CopyFromScreen Method (Int32, Int32, Int32, Int32, Size, CopyPixelOperation)

 

Performs a bit-block transfer of the color data, corresponding to a rectangle of pixels, from the screen to the drawing surface of the Graphics.

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

Public Sub CopyFromScreen (
	sourceX As Integer,
	sourceY As Integer,
	destinationX As Integer,
	destinationY As Integer,
	blockRegionSize As Size,
	copyPixelOperation As CopyPixelOperation
)

Parameters

sourceX
Type: System.Int32

The x-coordinate of the point at the upper-left corner of the source rectangle.

sourceY
Type: System.Int32

The y-coordinate of the point at the upper-left corner of the source rectangle

destinationX
Type: System.Int32

The x-coordinate of the point at the upper-left corner of the destination rectangle.

destinationY
Type: System.Int32

The y-coordinate of the point at the upper-left corner of the destination rectangle.

blockRegionSize
Type: System.Drawing.Size

The size of the area to be transferred.

copyPixelOperation
Type: System.Drawing.CopyPixelOperation

One of the CopyPixelOperation values.

Exception Condition
InvalidEnumArgumentException

copyPixelOperation is not a member of CopyPixelOperation.

Win32Exception

The operation failed.

The CopyFromScreen methods are useful for layering one image on top of another. The copyPixelOperation parameter allows you to specify if and how the source colors should be blended with the colors in the destination area.

The following example demonstrates how to use the CopyFromScreen method. To run this example, paste it into a Windows Form. Handle the form’s Paint event and call the CopyPixels4 method from the Paint event-handling method, passing e as PaintEventArgs.

Private Sub CopyPixels4(ByVal e As PaintEventArgs) 
    e.Graphics.CopyFromScreen(0, 0, 20, 20, _
        New Size(160, 160), CopyPixelOperation.SourceInvert)
End Sub

UIPermission

for access to all windows. Related enumeration: AllWindows.

.NET Framework
Available since 2.0
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