C# Signature:
[DllImport("user32.dll")]
static extern IntPtr GetWindowDC(IntPtr hWnd);
VB .NET Signature:
Declare Function GetWindowDC Lib "user32" (ByVal hwnd As IntPtr) As IntPtr
User-Defined Types:
None.
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
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
Declare Function GetWindowDC Lib "user32" (ByVal hwnd As IntPtr) As IntPtr
' Get an image of the form plus its decoration
' (borders, title bar, etc).
Private Function GetDecoratedFormImage() As Bitmap
' Get this form's Graphics object.
Dim MyGrph As Graphics = Me.CreateGraphics
' Make a Bitmap to hold the image.
Dim TempBMP As New Bitmap(Me.Width, Me.Height, MyGrph)
Dim MyGrphBmp As Graphics = MyGrph.FromImage(TempBMP)
Dim MyGrphBmpHdc As IntPtr = MyGrphBmp.GetHdc
' Get the form's hDC. We must do this after
' creating the new Bitmap, which uses me_gr.
Dim MyGrphHdc As IntPtr = GetWindowDC(Me.Handle)
' BitBlt the form's image onto the Bitmap.
BitBlt(MyGrphBmpHdc, 0, 0, Me.Width, Me.Height, MyGrphHdc, 0, 0, SRCCOPY)
MyGrphBmp.ReleaseHdc(MyGrphBmpHdc)
' Return the result.
Return TempBMP
End Function
Alternative Managed API:
Do you know one? Please contribute it!
