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Данный пример покажет, как можно сделать
скриншот всего экрана, текущего окна (с
заголовком и без), текущего окна по таймеру. А
также пример печати скриншота и сохранения в
файл.
Расположите на форме 7 элементов CommandButton,
элемент PictureBox (растяните изображение
PictureBox как можно больше). А также расположите на
форме элемент Microsoft Common Dialog Control 6.0 через
меню Project | Components.
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
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 PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
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 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 CreatePalette Lib "GDI32" (lpLogPalette As LOGPALETTE)
As Long
Private Declare Function DeleteDC Lib "GDI32" (ByVal hDC 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 Declare Function GetDeviceCaps Lib "GDI32" (ByVal hDC As Long, ByVal
iCapabilitiy As Long) As Long
Private Declare Function GetForegroundWindow Lib "USER32" () 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 GetWindowDC 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 RealizePalette Lib "GDI32" (ByVal hDC As Long) As Long
Private Declare Function ReleaseDC Lib "USER32" (ByVal hWnd As Long, ByVal hDC
As Long) 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 Declare Function SelectObject Lib "GDI32" (ByVal hDC As Long, ByVal
hObject As Long) As Long
Private Declare Function SelectPalette Lib "GDI32" (ByVal hDC As Long, ByVal
hPalette As Long, ByVal bForceBackground As Long) As Long
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
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)
hPalPrev = SelectPalette(hDCMemory, hPal, 0)
r = RealizePalette(hDCMemory)
End If
r = BitBlt(hDCMemory, 0, 0, WidthSrc, HeightSrc, hDCSrc, LeftSrc, TopSrc, vbSrcCopy)
hBmp = SelectObject(hDCMemory, hBmpPrev)
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
hPal = SelectPalette(hDCMemory, hPalPrev, 0)
End If
r = DeleteDC(hDCMemory)
r = ReleaseDC(hWndSrc, hDCSrc)
Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
End Function
Public Function CaptureActiveWindow() As Picture
Dim hWndActive As Long
Dim r As Long
Dim RectActive As RECT
hWndActive = GetForegroundWindow()
r = GetWindowRect(hWndActive, RectActive)
Set CaptureActiveWindow = CaptureWindow(hWndActive, False, 0, 0, RectActive.Right -
RectActive.Left, RectActive.Bottom - RectActive.Top)
End Function
Public Function CaptureClient(frmSrc As Form) As Picture
Set CaptureClient = CaptureWindow(frmSrc.hWnd, True, 0, 0,
frmSrc.ScaleX(frmSrc.ScaleWidth, frmSrc.ScaleMode, vbPixels),
frmSrc.ScaleY(frmSrc.ScaleHeight, frmSrc.ScaleMode, vbPixels))
End Function
Public 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)
End Function
Public Function CaptureForm(frmSrc As Form) As Picture
Set CaptureForm = CaptureWindow(frmSrc.hWnd, False, 0, 0, frmSrc.ScaleX(frmSrc.Width,
vbTwips, vbPixels), frmSrc.ScaleY(frmSrc.Height, vbTwips, vbPixels))
End Function
Public Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
Dim r As Long
Dim Pic As PicBmp
Dim IPic As IPicture
Dim IID_IDispatch As GUID
With IID_IDispatch
.Data1 = &H20400
.Data4(0) = &HC0
.Data4(7) = &H46
End With
With Pic
.Size = Len(Pic)
.Type = vbPicTypeBitmap
.hBmp = hBmp
.hPal = hPal
End With
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)
Set CreateBitmapPicture = IPic
End Function
Public Sub PrintPictureToFitPage(Prn As Printer, Pic As Picture)
Const vbHiMetric As Integer = 8
Dim PicRatio As Double
Dim PrnWidth As Double
Dim PrnHeight As Double
Dim PrnRatio As Double
Dim PrnPicWidth As Double
Dim PrnPicHeight As Double
If Pic.Height >= Pic.Width Then
Prn.Orientation = vbPRORPortrait
Else
Prn.Orientation = vbPRORLandscape
End If
PicRatio = Pic.Width / Pic.Height
PrnWidth = Prn.ScaleX(Prn.ScaleWidth, Prn.ScaleMode, vbHiMetric)
PrnHeight = Prn.ScaleY(Prn.ScaleHeight, Prn.ScaleMode, vbHiMetric)
PrnRatio = PrnWidth / PrnHeight
If PicRatio >= PrnRatio Then
PrnPicWidth = Prn.ScaleX(PrnWidth, vbHiMetric, Prn.ScaleMode)
PrnPicHeight = Prn.ScaleY(PrnWidth / PicRatio, vbHiMetric, Prn.ScaleMode)
Else
PrnPicHeight = Prn.ScaleY(PrnHeight, vbHiMetric, Prn.ScaleMode)
PrnPicWidth = Prn.ScaleX(PrnHeight * PicRatio, vbHiMetric, Prn.ScaleMode)
End If
Prn.PaintPicture Pic, 0, 0, PrnPicWidth, PrnPicHeight
End Sub
Private Sub Command1_Click()
Set Picture1.Picture = CaptureScreen()
End Sub
Private Sub Command2_Click()
Set Picture1.Picture = CaptureForm(Me)
End Sub
Private Sub Command3_Click()
MsgBox "Через 3 секунды после закрытия окна вы
получите изображение окна"
Dim EndTime As Date
EndTime = DateAdd("s", 3, Now)
Do Until Now > EndTime
DoEvents
Loop
Set Picture1.Picture = CaptureActiveWindow()
Me.SetFocus
End Sub
Private Sub Command4_Click()
Set Picture1.Picture = CaptureClient(Me)
End Sub
Private Sub Command5_Click()
PrintPictureToFitPage Printer, Picture1.Picture
Printer.EndDoc
End Sub
Private Sub Command6_Click()
CommonDialog1.DefaultExt = ".BMP"
CommonDialog1.Filter = "Bitmap Image (*.bmp)|*.bmp"
CommonDialog1.ShowSave
If CommonDialog1.FileName <> "" Then
SavePicture Picture1.Picture, CommonDialog1.FileName
End If
End Sub
Private Sub Command7_Click()
Set Picture1.Picture = Nothing
End Sub
Private Sub Form_Load()
Command1.Caption = "Весь экран"
Command2.Caption = "Активное окно"
Command3.Caption = "Активное окно (3 сек)"
Command4.Caption = "Акт. окно бе загол."
Command5.Caption = "Напечатать картинку"
Command6.Caption = "Сохранить картинку"
Command7.Caption = "Очистить"
End Sub
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