Các chiêu thức trong lập trình Chép cả màn hình làm việc vào một Picture home

Chép cả màn hình làm việc vào một Picture home
Xuất xứ : www.ttvnol.com
Binh khí sử dụng : 1 Picture và một nút ấn
Đoạn mã :
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function StretchBlt Lib "gdi32" (ByVal hdc 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
nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Private Sub Command1_Click()
Dim wScreen As Long
Dim hScreen As Long
Dim w As Long
Dim h As Long
Picture1.Cls
wScreen = Screen.Width \ Screen.TwipsPerPixelX
hScreen = Screen.Height \ Screen.TwipsPerPixelY
Picture1.ScaleMode = vbPixels
w = Picture1.ScaleWidth
h = Picture1.ScaleHeight
hdcScreen = GetDC(0)
r = StretchBlt(Picture1.hdc, 0, 0, w, h, hdcScreen, 0, 0, wScreen, hScreen,
vbSrcCopy)
End Sub