怎样用VB实现抓屏？

[hld168]

如何抓整个桌面及活动窗口？

[lihonggen0]

要用到如下API

Private Type POINTAPI
    x As Long
    y As Long
End Type
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 GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function DrawIcon Lib "user32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal hIcon As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long

Private Sub Command1_Click()
    Dim hdc As Long
    Dim sw As Integer
    Dim sh As Integer
    Dim CurPos As POINTAPI
    Dim Cur As Long
    Me.Hide
    DoEvents
    Picture1.AutoRedraw = True
    hdc = GetDC(0)
    GetCursorPos CurPos
    Cur = GetCursor
    Picture1.Width = Screen.Width
    Picture1.Height = Screen.Height
    sw = Screen.Width / Screen.TwipsPerPixelX
    sh = Screen.Height / Screen.TwipsPerPixelY
    BitBlt Picture1.hdc, 0, 0, sw, sh, hdc, 0, 0, vbSrcCopy
    Me.Show
    DrawIcon Picture1.hdc, CurPos.x - 10, CurPos.y - 10, Cur
    ReleaseDC 0, hdc
    Picture1.AutoRedraw = False

End Sub

[lihonggen0]

活动窗口：

'Option Compare Database
Option Explicit

Type RECT_Type

   left As Long
   top As Long
   right As Long
   bottom As Long

End Type

'The following declare statements are case sensitive.

Declare Function GetActiveWindow Lib "User32" () As Long
Declare Function GetDesktopWindow Lib "User32" () As Long
Declare Sub GetWindowRect Lib "User32" (ByVal Hwnd As Long, _
                                    lpRect As RECT_Type)
Declare Function GetDC Lib "User32" (ByVal Hwnd As Long) As Long
Declare Function CreateCompatibleDC Lib "Gdi32" (ByVal hdc As Long) _
                                    As Long
Declare Function CreateCompatibleBitmap Lib "Gdi32" (ByVal hdc _
                                    As Long, ByVal nWidth As Long, _
                                    ByVal nHeight As Long) As Long
Declare Function SelectObject Lib "Gdi32" (ByVal hdc As Long, _
                                    ByVal hObject As Long) As Long
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
Declare Function OpenClipboard Lib "User32" (ByVal Hwnd As Long) As Long
Declare Function EmptyClipboard Lib "User32" () As Long
Declare Function SetClipboardData Lib "User32" (ByVal wFormat As Long, _
                                    ByVal hMem As Long) As Long
Declare Function CloseClipboard Lib "User32" () As Long
Declare Function ReleaseDC Lib "User32" (ByVal Hwnd As Long, _
                                    ByVal hdc As Long) As Long
Declare Function DeleteDC Lib "Gdi32" (ByVal hdc As Long) As Long
Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)

Global Const SRCCOPY = &HCC0020
Global Const CF_BITMAP = 2


Function ScreenDump()
   Dim AccessHwnd As Long, DeskHwnd As Long
   Dim hdc As Long
   Dim hdcMem As Long
   Dim rect As RECT_Type
   Dim junk As Long
   Dim fwidth As Long, fheight As Long
   Dim hBitmap As Long

  ' DoCmd.Hourglass True

   '---------------------------------------------------
   ' Get window handle to Windows and Microsoft Access
   '---------------------------------------------------
   DoEvents
   DeskHwnd = GetDesktopWindow()
   AccessHwnd = GetActiveWindow()

   '---------------------------------------------------
   ' Get screen coordinates of Microsoft Access
   '---------------------------------------------------
   Call GetWindowRect(AccessHwnd, rect)
   fwidth = rect.right - rect.left
   fheight = rect.bottom - rect.top

   '---------------------------------------------------
   ' Get the device context of Desktop and allocate memory
   '---------------------------------------------------
   hdc = GetDC(DeskHwnd)
   hdcMem = CreateCompatibleDC(hdc)
   hBitmap = CreateCompatibleBitmap(hdc, fwidth, fheight)

   If hBitmap <> 0 Then
      junk = SelectObject(hdcMem, hBitmap)

      '---------------------------------------------
      ' Copy the Desktop bitmap to memory location
      ' based on Microsoft Access coordinates.
      '---------------------------------------------
      junk = BitBlt(hdcMem, 0, 0, fwidth, fheight, hdc, rect.left, _
                    rect.top, SRCCOPY)

      '---------------------------------------------
      ' Set up the Clipboard and copy bitmap
      '---------------------------------------------
      junk = OpenClipboard(DeskHwnd)
      junk = EmptyClipboard()
      junk = SetClipboardData(CF_BITMAP, hBitmap)
      junk = CloseClipboard()
   End If

   '---------------------------------------------
   ' Clean up handles
   '---------------------------------------------
   junk = DeleteDC(hdcMem)
   junk = ReleaseDC(DeskHwnd, hdc)

  ' DoCmd.Hourglass False

End Function

[6742]

同意前面2位

[碧海情天-赵亮]

这样也好，如果都GOOGLE的话，想得分就不容易了，容易减少回答者的积极性和来访次数，那么有找不到答案的问题再来问的话，也就不容易得到答案了。现在的一些新机制促进了一些积极性，很多消失已久的人都回来了呢。

[tongnaifu]

mark一下

[zzyong00]

难得一见李洪根

[daisy8675]

[Quote=引用 7 楼 zzyong00 的回复:]
难得一见李洪根
[/Quote]

哈哈,他现在在米国估计发闲空了

[a294447011294447011]

VB抓屏代码网上很多:
比如:
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
Private Sub Form_Load()
End Sub





还有如:
Option Explicit
Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Private Sub Command1_Click()
keybd_event vbKeySnapshot, 0&, 0&, 0&
DoEvents
Picture1.Picture = Clipboard.GetData(vbCFBitmap)
SavePicture Picture1.Picture, "c:\屏幕截图.bmp"
End Sub

[lorl2]

提问之前,怎么不GOOGLE一下"vb 抓屏"先呢?

[li730128]

不错，大家很热心的。

[wap21]

帮顶

[wap21]

mark

[Soyokaze]

模拟键盘的PrintScreen键，然后从剪贴板里拷贝。这也是一种可行的方案。

[zztxfxp]

学习了，不过二楼代码好像不完整。疑惑中。。。。

[clear_zero]

学习

[ZOU_SEAFARER]

直接使用屏幕拷贝，然后存储

[qzw405]

帮你顶！