捕捉屏幕图象




 

声明：

Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, 

ByVal hdc As Long) As Long

Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd As Long) 

As Long

Private Declare Function EmptyClipboard Lib "user32" () As Long

Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat As 

Long, ByVal hMem As Long) As Long

Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, 

ByVal hObject As Long) As Long

Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc 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 CreateDC Lib "gdi32" Alias "CreateDCA" (ByVal 

lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As 

String, lpInitData As Long) As Long

Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As 

Long) As Long

Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc 

As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long

Private Declare Function CloseClipboard Lib "user32" () As Long

函数：

Sub ScrnCap(Lt, Top, Rt, Bot)

rWidth = Rt - Lt

rHeight = Bot - Top

SourceDC = CreateDC("DISPLAY", 0, 0, 0)

DestDC = CreateCompatibleDC(SourceDC)

BHandle = CreateCompatibleBitmap(SourceDC, rWidth, rHeight)

SelectObject DestDC, BHandle

BitBlt DestDC, 0, 0, rWidth, rHeight, SourceDC, Lt, Top, &HCC0020

Wnd = Screen.ActiveForm.hwnd

OpenClipboard Wnd

EmptyClipboard

SetClipboardData 2, BHandle

CloseClipboard

DeleteDC DestDC

ReleaseDC DHandle, SourceDC

End Sub

以下的示例把屏幕图象捕捉后，放到Picture1 中。

Sub Command1_Click()

Form1.Visible = False

ScrnCap 0, 0, 640, 480

Form1.Visible = True

picture1 = Clipboard.GetData()

End Sub