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 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
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
以上是下面要用到的API的聲明
代碼是復(fù)制過(guò)來(lái)的，所以這些API是干什么要的，我不怎么了解，Command1按鈕按下后，效果就是抓取屏幕，且顯示在Picture1上面，誰(shuí)來(lái)解釋下Sub Command1_Click()各代碼做的是什么事情？
Private Sub Command1_Click()
SourceDC = CreateDC("DISPLAY", 0, 0, 0)
DestDC = CreateCompatibleDC(SourceDC)
Bhandle = CreateCompatibleBitmap(SourceDC, 400, 300) '顯示區(qū)域設(shè)置
SelectObject DestDC, Bhandle
BitBlt DestDC, 100, 100, 400, 300, SourceDC, 0, 0, &HCC0020 '設(shè)置抓圖區(qū)域
Wnd = Screen.ActiveForm.hwnd
OpenClipboard Wnd
EmptyClipboard
SetClipboardData 2, Bhandle
CloseClipboard
DeleteDC DestDC
ReleaseDC Dhandle, SourceDC
Picture1.Picture = Clipboard.GetData()
End Sub
SourceDC = CreateDC("DISPLAY", 0, 0, 0)
DestDC = CreateCompatibleDC(SourceDC)
Bhandle = CreateCompatibleBitmap(SourceDC, 800, 600) '顯示區(qū)域設(shè)置
SelectObject DestDC, Bhandle
BitBlt DestDC, 0, 0, 800, 600, SourceDC, 0, 0, &HCC0020 '設(shè)置抓圖區(qū)域
Wnd = Screen.ActiveForm.hwnd
OpenClipboard Wnd
EmptyClipboard
SetClipboardData 2, Bhandle
CloseClipboard
DeleteDC DestDC
ReleaseDC Dhandle, SourceDC
Picture1.Picture = Clipboard.GetData()
