Capture ScreenShot

This example lets you capture a picture of a specific window, the active window, or the entire screen.

Add a picturebox called picScreen, and add the code below. To use, call the GetShot procedure with the hWnd of a window. For example, to get a shot of another form in your project called frmMain, call GetShot frmMain.hwnd. Likewise, to get a shot of the whole screen, call GetShot GetDesktopWindow. (GetDesktopWindow is an API which returns the whole screen, and is declared in the code below)

Option Explicit
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long

Private Declare Function GetActiveWindow Lib "user32" () As Long
Private Declare Function GetTopWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hDC As Long) As Long
Private Type RECT
        Left As Long
        Top As Long
        Right As Long
        Bottom As Long
End Type
Private Type BITMAP
        bmType As Long
        bmWidth As Long
        bmHeight As Long
        bmWidthBytes As Long
        bmPlanes As Integer
        bmBitsPixel As Integer
        bmBits As Long
End Type


Private Sub GetShot(lWindowhWnd As Long)
    Dim nLeft As Long
    Dim nTop As Long
    Dim nWidth As Long
    Dim nHeight As Long
    Dim rRect As RECT
    Dim bm As BITMAP
    Dim lWindowhDC As Long
   
    Hide
    picScreen.Cls
    Set picScreen.Picture = Nothing
    GetWindowRect lWindowhWnd, rRect
    lWindowhDC = GetWindowDC(lWindowhWnd)
    '// Get coordinates
    nLeft = 0
    nTop = 0
    nWidth = rRect.Right - rRect.Left
    nHeight = rRect.Bottom - rRect.Top
    '// Blt to frm.picScreen
    BitBlt picScreen.hDC, 0, 0, nWidth, nHeight, lWindowhDC, nLeft, nTop, vbSrcCopy
    '// Del DC
    ReleaseDC lWindowhWnd, lWindowhDC
    '// set picture
    picScreen.Picture = picScreen.Image
    Show
End Sub