C# Signature:
[DllImport("user32.dll", SetLastError = false)]
static extern IntPtr GetDesktopWindow();
VB Signature:
Private Declare Auto Function GetDesktopWindow Lib "user32.dll" () As IntPtr
User-Defined Types:
None.
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
Here are some functions that you can use to get an image of the destop:
Private Declare Auto Function GetDesktopWindow Lib "user32.dll" () As IntPtr
Private Declare Auto Function GetWindowDC Lib "user32.dll" (ByVal _
windowHandle As IntPtr) As IntPtr
Private Declare Auto Function ReleaseDC Lib "user32.dll" (ByVal _
windowHandle As IntPtr, ByVal dc As IntPtr) As Integer
Private Declare Auto Function BitBlt Lib "gdi32.dll" (ByVal _
hdcDest As IntPtr, ByVal nXDest As Integer, ByVal _
nYDest As Integer, ByVal nWidth As Integer, ByVal _
nHeight As Integer, ByVal hdcSrc As IntPtr, ByVal nXSrc _
As Integer, ByVal nYSrc As Integer, ByVal dwRop As _
System.Int32) As Boolean
Private Const SRCCOPY As Integer = &HCC0020
Public Function GetScreenshot(ByVal windowHandle As IntPtr, _
ByVal location As Point, ByVal size As Size) As Image
Dim myImage As Image = New Bitmap(size.Width, size.Height)
Dim g As Graphics = Graphics.FromImage(myImage)
Dim destDeviceContext As IntPtr = g.GetHdc
Dim srcDeviceContext As IntPtr = GetWindowDC(windowHandle)
BitBlt(destDeviceContext, 0, 0, size.Width, size.Height, _
srcDeviceContext, location.X, location.Y, SRCCOPY)
ReleaseDC(windowHandle, srcDeviceContext)
g.ReleaseHdc(destDeviceContext)
Return myImage
End Function
Alternative Managed API:
Do you know one? Please contribute it!
