Print Screen

[TB]

How can I copy the screen to the clipboard (Print Screen Key) in my Visual Basic program?
(I tried this with the Sendkeys Function, but that didn't work.)
Thank you for any help.

Thomas

[gwdash]

Try This:

Const RC_PALETTE As Long = &H100
Const SIZEPALETTE As Long = 104
Const RASTERCAPS As Long = 38
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 Type PicBmp
    Size As Long
    Type As Long
    hBmp As Long
    hPal As Long
    Reserved As Long
End Type
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) 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 SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject 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 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 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 DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
    Dim R As Long, Pic As PicBmp, IPic As IPicture, IID_IDispatch As GUID

    'Fill GUID info
    With IID_IDispatch
        .Data1 = &H20400
        .Data4(0) = &HC0
        .Data4(7) = &H46
    End With

    'Fill picture info
    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 the picture
    R = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)

    'Return the new picture
    Set CreateBitmapPicture = IPic
End Function
Function hDCToPicture(ByVal hDCSrc As Long, ByVal LeftSrc As Long, ByVal TopSrc As Long, ByVal WidthSrc As Long, ByVal HeightSrc As Long) As Picture
    Dim hDCMemory As Long, hBmp As Long, hBmpPrev As Long, R As Long
    Dim hPal As Long, hPalPrev As Long, RasterCapsScrn As Long, HasPaletteScrn As Long
    Dim PaletteSizeScrn As Long, LogPal As LOGPALETTE

    'Create a compatible device context
    hDCMemory = CreateCompatibleDC(hDCSrc)
    'Create a compatible bitmap
    hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
    'Select the compatible bitmap into our compatible device context
    hBmpPrev = SelectObject(hDCMemory, hBmp)

    'Raster capabilities?
    RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS) ' Raster
    'Does our picture use a palette?
    HasPaletteScrn = RasterCapsScrn And RC_PALETTE ' Palette
    'What's the size of that palette?
    PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE) ' Size of

    If HasPaletteScrn And (PaletteSizeScrn = 256) Then
        'Set the palette version
        LogPal.palVersion = &H300
        'Number of palette entries
        LogPal.palNumEntries = 256
        'Retrieve the system palette entries
        R = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
        'Create the palette
        hPal = CreatePalette(LogPal)
        'Select the palette
        hPalPrev = SelectPalette(hDCMemory, hPal, 0)
        'Realize the palette
        R = RealizePalette(hDCMemory)
    End If
    
    'Copy the source image to our compatible device context
    R = BitBlt(hDCMemory, 0, 0, WidthSrc, HeightSrc, hDCSrc, LeftSrc, TopSrc, vbSrcCopy)
    
    'Restore the old bitmap
    hBmp = SelectObject(hDCMemory, hBmpPrev)
    
    If HasPaletteScrn And (PaletteSizeScrn = 256) Then
        'Select the palette
        hPal = SelectPalette(hDCMemory, hPalPrev, 0)
    End If
    
    'Delete our memory DC
    R = DeleteDC(hDCMemory)

    Set hDCToPicture = CreateBitmapPicture(hBmp, hPal)
End Function
Private Sub Form_Load()
    'KPD-Team 1999
    'URL: http://www.allapi.net/
    'E-Mail: [email protected]
    'Create a picture object from the screen
    Clipboard.SetData (hDCToPicture(GetDC(0), 0, 0, Screen.Width / Screen.TwipsPerPixelX, Screen.Height / Screen.TwipsPerPixelY), vbCFBitmap
End Sub

[Alfred]

' Very nice code but the code is not working because of some coding errors. I have put a command button on the form and adjusted the code in the following way.
Private Sub Command1_Click()

'KPD-Team 1999
'URL: http://www.allapi.net/
'E-Mail: [email protected]
'Create a picture object from the screen
Dim hWndDeskTop, hDCDeskTop As Long
Dim pic As Picture

hWndDeskTop = GetDesktopWindow() ' Get the desktop window handle
hDCDeskTop = GetDC(hWndDeskTop) ' Get desktop device context ( hDCDeskTop = GetDC(0) will also work)
' Get picture object
Set pic = hDCToPicture(hDC, 0, 0, CLng(Screen.Width / Screen.TwipsPerPixelX), CLng(Screen.Height / Screen.TwipsPerPixelY))
' Copy to clipboard
Clipboard.SetData pic, vbCFBitmap
' Test screen capture
Me.Picture = pic
Me.Width = Screen.Width
Me.Height = Screen.Height
End Sub

[Alfred]

' Some simple bitmap copy example to play with
' Put the code in a form with a command button on it
Option Explicit

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 GetDesktopWindow Lib "user32" () As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long

Private Const SRCCOPY = &HCC0020

Private Sub Command1_Click()
Dim hWndDeskTop As Long, hDCDeskTop As Long

' Hide this form so it will not be in the captured bitmap
Me.Hide
DoEvents
' Get desktop window and device context
hWndDeskTop = GetDesktopWindow()
hDCDeskTop = GetDC(hWndDeskTop)
' Copy desktop bitmap to this form's bitmap
' using the bit block transfer function BitBlt
BitBlt Me.hdc, 0, 0, CLng(Screen.Width / Screen.TwipsPerPixelX), CLng(Screen.Height / Screen.TwipsPerPixelY), hDCDeskTop, 0, 0, SRCCOPY
' Me this form visible again
Me.Show
End Sub

[Alfred]

Try using StretchBlt instead of BitBlt:

StretchBlt Me.hdc, 0, 0, ScaleX(ScaleWidth, vbTwips, vbPixels), ScaleY(ScaleHeight, vbTwips, vbPixels), _
hDCDeskTop, 0, 0, CLng(Screen.Width / Screen.TwipsPerPixelX), CLng(Screen.Height / Screen.TwipsPerPixelY), SRCCOPY

[tongbiscom]

to Alfred:

can you show me the code of capture screen
by using the BitBlt and StretchBlt to Windows Clipboard

Thanks

tong,

[tongbiscom]

i want to know how to use the BitBlt and StretchBlt func
to capture screen to clipboard.

[YoungBuck]

If you have to do it the hard way then here it is .....

Add a command button to a form

Option Explicit

Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function CloseClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat As Long, ByVal hMem As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () 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 CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject 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 Const CF_BITMAP = 2

Public Function CopyScreenToClipboard() As Long
 Dim lngScreenDC As Long
 Dim lngScreenH As Long, lngScreenW As Long
 Dim lngDC As Long
 Dim lngBMP As Long, lngOrigBMP As Long
 
 ' get a handle to the screen
 lngScreenDC = GetDC(GetDesktopWindow)
 ' get the dimensions of the screen in pixels
 lngScreenH = Screen.Height \ Screen.TwipsPerPixelY
 lngScreenW = Screen.Width \ Screen.TwipsPerPixelX
 
 ' create a dc to temporarily hold the screen bmp
 lngDC = CreateCompatibleDC(lngScreenDC)
 
 ' create the bitmap in memory to hold picture of the screen
 lngBMP = CreateCompatibleBitmap(lngScreenDC, lngScreenW, lngScreenH)
 
 ' put the BMP created into the DC created
 lngOrigBMP = SelectObject(lngDC, lngBMP)
 
 ' blt the current state of the screen to the DC
 BitBlt lngDC, 0, 0, lngScreenW, lngScreenH, lngScreenDC, 0, 0, vbSrcCopy
 
    'open the clipboard
    If OpenClipboard(Me.hwnd) Then
        
         ' clear the clipboard of current data
        If EmptyClipboard Then
        
            ' put the bitmap in clipboard
            SetClipboardData CF_BITMAP, lngBMP
 
            ' don't need to be thw owner of the clipboard anymore so let it go
            CloseClipboard
            
        Else
        
            MsgBox "Error saving data to clipboard!"
        
        End If
        
    Else
 
        MsgBox "Error saving data to clipboard!"
 
    End If

 
 ' free memory
 SelectObject lngDC, lngOrigBMP
 DeleteDC lngDC
    
End Function

Private Sub Command1_Click()
    CopyScreenToClipboard
End Sub

[tongbiscom]

thank you so much youngbuck.

it's nice code.

tong,

[Alfred]

Yes its very nice.