Attribute VB_Name = "ModCapWindow2"
'马大哈 收集于 2005-8-22
'
'
Option Explicit

'定位鼠标。
Private Type POINTAPI

    x As Long
    y As Long

End Type

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 Const SM_CXSCREEN = 0    'X Size of screen
Private Const SM_CYSCREEN = 1    'Y Size of Screen

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 GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long

Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) As Long


'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
' CreateBitmapPicture
'    - Creates a bitmap type Picture object from a bitmap and
'      palette.
'
' hBmp
'    - Handle to a bitmap.
'
' hPal
'    - Handle to a Palette.
'    - Can be null if the bitmap doesn't use a palette.
'
' Returns
'    - Returns a Picture object containing the bitmap.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
Public 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




'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
' CaptureWindow
'    - Captures any portion of a window.
'
' hWndSrc
'    - Handle to the window to be captured.
'
' Client
'    - If True CaptureWindow captures from the client area of the
'      window.
'    - If False CaptureWindow captures from the entire window.
'
' LeftSrc, TopSrc, WidthSrc, HeightSrc
'    - Specify the portion of the window to capture.
'    - Dimensions need to be specified in pixels.
'
' Returns
'    - Returns a Picture object containing a bitmap of the specified
'      portion of the window that was captured.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''
'

Public 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

    ' Depending on the value of Client get the proper device context.
    If Client Then
        hDCSrc = GetDC(hWndSrc)    ' Get device context for client area.
    Else
        hDCSrc = GetWindowDC(hWndSrc)    ' Get device context for entire window.
    End If

    ' Create a memory device context for the copy process.
    hDCMemory = CreateCompatibleDC(hDCSrc)
    ' Create a bitmap and place it in the memory DC.
    hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
    hBmpPrev = SelectObject(hDCMemory, hBmp)

    ' Get screen properties.
    RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS)    ' Raster
    ' capabilities.
    HasPaletteScrn = RasterCapsScrn And RC_PALETTE    ' Palette
    ' support.
    PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE)    ' Size of
    ' palette.

    ' If the screen has a palette make a copy and realize it.
    If HasPaletteScrn And (PaletteSizeScrn = 256) Then
        ' Create a copy of the system palette.
        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

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
' CaptureScreen
'    - Captures the entire screen.
'
' Returns
'    - Returns a Picture object containing a bitmap of the screen.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
Public Function CaptureScreen() As Picture
Dim hWndScreen As Long

Dim Wwidth As Long
Dim Wheight As Long

    Wwidth = GetSystemMetrics(SM_CXSCREEN)
    Wheight = GetSystemMetrics(SM_CYSCREEN)
    ' Get a handle to the desktop window.
    hWndScreen = GetDesktopWindow()


    ' Call CaptureWindow to capture the entire desktop give the handle
    ' and return the resulting Picture object.   Screen.width / Screen.TwipsPerPixelX**********Screen.Height / Screen.TwipsPerPixelY

    Set CaptureScreen = CaptureWindow(hWndScreen, True, 0, 0, Wwidth, Wheight)

End Function