The GetWindowDC function retrieves the device context (DC) for the entire window, including title bar, menus, and scroll bars. A window device context permits painting anywhere in a window, because the origin of the device context is the upper-left corner of the window instead of the client area. GetWindowDC assigns default attributes to the window device context each time it retrieves the device context. Previous attributes are lost.

static extern IntPtr GetWindowDC(IntPtr hWnd);

Public Shared Function GetWindowDC(ByVal hWnd As IntPtr) As IntPtr

Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long

GetWindowDC is intended for special painting effects within a window's nonclient area. Painting in nonclient areas of any window is not recommended. The GetSystemMetrics function can be used to retrieve the dimensions of various parts of the nonclient area, such as the title bar, menu, and scroll bars. The GetDC function can be used to retrieve a device context for the entire screen.

Declare Function GetWindowDC Lib "user32" (ByVal hwnd As IntPtr) As IntPtr

Dim MyGrphHdc As IntPtr = GetWindowDC(Me.Handle)

Documentation

[GetWindowDC] on MSDN

coredll

3: GetWindowDC

[DllImport("coredll.dll", EntryPoint="GetWindowDC", SetLastError=true)]

private static extern IntPtr GetWindowDCCE(IntPtr hWnd);

<DllImport("coredll.dll", EntryPoint:="GetWindowDC", CharSet:=CharSet.Auto, ExactSpelling:=True)> _

Private Shared Function GetWindowDC(ByVal hWnd As HandleRef) As IntPtr

Declare Function GetWindowDC Lib "coredll.dll" (ByVal hWnd As HandleRef) As IntPtr

Documentation

[GetWindowDC] on MSDN

gdi32

4: BitBlt

dc2=GetWindowDC(c.Handle);

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