提示“用户定义类型未定义”，为什么呢？
'****************以下保存在窗体中，窗体中需要一个Picture图片框控件数组，一个按钮，一个计时器,一个Shape控件'Picture1(0)用于记录当前屏幕图像，Picture1(1)用于记录每隔两秒的屏幕新的图像，对这两个图像进行对比
'****************本示例工程意义：每两秒中截一幅屏幕画面，当发现新的画面与前一次截取的画面不同的时候，将新的截图写入D盘(顺着按钮事件一步一步看即可)
'在窗体上画好控件以后，将下面代码复制到窗体代码中即可
'本示例运行后，拖动本窗口，即可实时感觉Shape控件的颜色发生变化
Private Type PALETTEENTRY
peRed As Byte
peGreen As Byte
peBlue As Byte
peFlags As Byte
End Type
Private Type LOGPALETTE
palVersion As Integer
palNumEntries As Integer
palPalEntry(255) As PALETTEENTRY ' Enough for 256 colors.
End Type
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type
Private Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = &H100
Private Const SIZEPALETTE As Long = 104
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type
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 GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal iCapabilitiy As Long) As Long
Private Declare Function GetSystemPaletteEntries Lib "gdi32" (ByVal hdc As Long, ByVal wStartIndex As Long, ByVal wNumEntries As Long, lpPaletteEntries As PALETTEENTRY) As Long
Private Declare Function CreatePalette Lib "gdi32" (lpLogPalette As LOGPALETTE) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hDCSrc As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long
Private Declare Function SelectPalette Lib "gdi32" (ByVal hdc As Long, ByVal hPalette As Long, ByVal bForceBackground As Long) As Long
Private Declare Function RealizePalette Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hWnd As Long, lpRect As RECT) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hWnd As Long, ByVal hdc As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) As Long
Private Const nPercent As Integer = 100
Dim bit1() As Byte, bit2() As Byte
Private Sub Form_Load()
Show
Me.ScaleMode = 3
Picture1(0).ScaleMode = 3
Picture1(0).Move 10, 10, 400, 300
Picture1(0).AutoRedraw = True
Picture1(1).Move 420, 10, 400, 300
Picture1(1).AutoRedraw = True
Command1.Move 300, 320, 130, 30
Command1.Caption = "对比图片"
Command1.Tag = 0
Command1.Default = True
'Delay 2000
Set Picture1(0).Picture = CaptureScreen()
Timer1.Enabled = True
Timer1.Interval = 2000 '两秒截个图
End Sub
Private Sub Picture1_MouseDown(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 And Index = 1 And Command1.Tag = 1 Then SetBitmapBits Picture1(1).Image, UBound(bit2), bit2(1)
End Sub
Private Sub Command1_Click()
'Dim r As Long
Dim sss As String
sss = "D:\" & Replace(Replace(Replace(Now, " ", ""), ":", ""), "-", "") & ".bmp"
getbit Picture1(0).Image, bit1()
getbit Picture1(1).Image, bit2()
For i = 1 To UBound(bit1) Step 4
If Abs(CInt(bit1(i)) - CInt(bit2(i))) <= nPercent And Abs(CInt(bit1(i + 1)) - CInt(bit2(i + 1))) <= nPercent And Abs(CInt(bit1(i + 2)) - CInt(bit2(i + 2))) <= nPercent Then
n = n + 1
End If
Next
r = Round(400 * n / UBound(bit1), 2)
If r <> 100 Then '如果两个图片不同
Shape1.BackColor = vbGreen
Picture1(0).Picture = Picture1(1).Image
SavePicture Picture1(1).Image, sss
Else
Shape1.BackColor = vbRed
End If
Command1.Tag = 1
End Sub
Function getbit(ByVal hBmp As Long, ByRef bit() As Byte)
Dim picinfo As BITMAP
GetObject hBmp, Len(picinfo), picinfo
ReDim bit(1 To picinfo.bmHeight * picinfo.bmWidth * 4)
GetBitmapBits hBmp, UBound(bit), bit(1)
End Function
Private Function CaptureScreen() As Picture
Dim hWndScreen As Long
hWndScreen = GetDesktopWindow()
Set CaptureScreen = CaptureWindow(hWndScreen, False, 0, 0, Screen.Width \ Screen.TwipsPerPixelX, Screen.Height \ Screen.TwipsPerPixelY - GetTrayHeight)
End Function
Private Function CaptureWindow(ByVal hWndSrc As Long, ByVal Client As Boolean, ByVal LeftSrc As Long, ByVal TopSrc As Long, ByVal WidthSrc As Long, ByVal HeightSrc As Long) As Picture
Dim hDCMemory As Long
Dim hBmp As Long
Dim hBmpPrev As Long
Dim r As Long
Dim hDCSrc As Long
Dim hPal As Long
Dim hPalPrev As Long
Dim RasterCapsScrn As Long
Dim HasPaletteScrn As Long
Dim PaletteSizeScrn As Long
Dim LogPal As LOGPALETTE
If Client Then
hDCSrc = GetDC(hWndSrc)
Else
hDCSrc = GetWindowDC(hWndSrc)
End If
hDCMemory = CreateCompatibleDC(hDCSrc)
hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
hBmpPrev = SelectObject(hDCMemory, hBmp)
RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS)
HasPaletteScrn = RasterCapsScrn And RC_PALETTE
PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE)
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
LogPal.palVersion = &H300
LogPal.palNumEntries = 256
r = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
hPal = CreatePalette(LogPal)
' Select the new palette into the memory DC and realize it.
hPalPrev = SelectPalette(hDCMemory, hPal, 0)
r = RealizePalette(hDCMemory)
End If
' Copy the on-screen image into the memory DC.
r = BitBlt(hDCMemory, 0, 0, WidthSrc, HeightSrc, hDCSrc, LeftSrc, TopSrc, vbSrcCopy)
' Remove the new copy of the on-screen image.
hBmp = SelectObject(hDCMemory, hBmpPrev)
' If the screen has a palette get back the palette that was
' selected in previously.
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
hPal = SelectPalette(hDCMemory, hPalPrev, 0)
End If
' Release the device context resources back to the system.
r = DeleteDC(hDCMemory)
r = ReleaseDC(hWndSrc, hDCSrc)
' Call CreateBitmapPicture to create a picture object from the
' bitmap and palette handles. Then return the resulting picture
' object.
Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
End Function
Private Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
Dim r As Long
Dim Pic As PicBmp
' IPicture requires a reference to "Standard OLE Types."
Dim IPic As IPicture
Dim IID_IDispatch As GUID
' Fill in with IDispatch Interface ID.
With IID_IDispatch
.Data1 = &H20400
.Data4(0) = &HC0
.Data4(7) = &H46
End With
' Fill Pic with necessary parts.
With Pic
.Size = Len(Pic) ' Length of structure.
.Type = vbPicTypeBitmap ' Type of Picture (bitmap).
.hBmp = hBmp ' Handle to bitmap.
.hPal = hPal ' Handle to palette (may be null).
End With
' Create Picture object.
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)
' Return the new Picture object.
Set CreateBitmapPicture = IPic
End Function
Function GetTrayHeight() As Double
Dim hTrayWnd As Long, rc As RECT
hTrayWnd = FindWindow("Shell_TrayWnd", vbNullString)
GetWindowRect hTrayWnd, rc
GetTrayHeight = rc.Bottom - rc.Top
End Function
Private Sub Timer1_Timer()
Set Picture1(1).Picture = CaptureScreen()
Command1_Click
DoEvents
End Sub
提示“用户定义类型未定义”，为什么呢？怎么修改？
