VB NET屏幕截图方法2则
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屏幕截图方法2则
' 根据VB6代码改的，经过本人优化。请先导入Drawing类库。DeclareFunction SelectObject Lib"gdi32" (ByVal hdc AsInteger,
ByVal hObject AsInteger) AsInteger
DeclareFunction BitBlt Lib"gdi32" (ByVal hDestDC AsInteger, ByVal x AsInteger, ByVal y AsInteger, ByVal nWidth AsInteger,
ByVal nHeight AsInteger, ByVal hSrcDC AsInteger, ByVal xSrc AsInteger, ByVal ySrc AsInteger, ByVal dwRop AsInteger) AsInteger DeclareFunction CreateCompatibleBitmap Lib"gdi32"(ByVal hdc AsInteger, ByVal nWidth AsInteger, ByVal nHeight AsInteger) AsInteger DeclareFunction CreateDC Lib"gdi32"Alias"CreateDCA"
(ByVal lpDriverName AsString, ByVal lpDeviceName AsString,
ByVal lpOutput AsString, ByRef lpInitData AsInteger) AsInteger DeclareFunction CreateCompatibleDC Lib"gdi32" (ByVal hdc AsInteger) AsInteger
Function GetSerPic(OptionalByVal BitWidth AsInteger = -1, OptionalByVal BitHeight AsInteger = -1) As Image
If BitWidth<0Then BitWidth = puter.Screen.Bounds.Width
If BitHeight<0Then BitHeight = puter.Screen.Bounds.Height
Dim Bhandle, DestDC, SourceDC As IntPtr
SourceDC = CreateDC("DISPLAY", Nothing, Nothing, 0)
DestDC = CreateCompatibleDC(SourceDC)
Bhandle = CreateCompatibleBitmap(SourceDC, BitWidth, BitHeight) SelectObject(DestDC, Bhandle)
BitBlt(DestDC, 0, 0, BitWidth, BitHeight, SourceDC, 0, 0, &HCC0020) Return Image.FromHbitmap(Bhandle)
End Function
' 最近学了Graphics类的画图方法，所以无聊就写了两个小程序。
' 这一例是不使用系统API就可以进行屏幕截取的代码。
PublicClass frmMain
PrivateSub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.Hide()
Dim p1 AsNew Point(0, 0)
Dim p2 AsNew Point(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height)
Dim pic AsNew Bitmap(p2.X, p2.Y)
Using g As Graphics = Graphics.FromImage(pic)
g.CopyFromScreen(p1, p1, p2)
Me.BackgroundImage = pic
EndUsing
Me.Show() End Sub End Class