如何实现屏幕拷贝？谢

[newqp]

如何实现屏幕拷贝？谢

[3661512]

看看
Option Explicit
Private Type PALETTEENTRY
peRed As Byte
peGreen As Byte
peBlue As Byte
peFlags As Byte
End Type


Private Declare Function GetTempPath Lib "kernel32" Alias "GetTempPathA" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long
Private Declare Function getDesktop Lib "ImageUtils.dll" (ByVal strFileName As String, ByVal blnEnableOverWrite As Boolean, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal blnJpeg As Boolean, ByVal JPGCompressQuality As Integer) As Integer
Private Declare Function GrayScale Lib "ImageUtils.dll" (ByVal strInputFile As String, ByVal strOutputFile As String, ByVal blnEnableOverWrite As Boolean) As Integer
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Declare Function ConvertBMPtoJPG Lib "ImageUtils.dll" (ByVal strInputFile As String, ByVal strOutputFile As String, ByVal blnEnableOverWrite As Boolean, ByVal JPGCompressQuality As Integer, ByVal blnKeepBMP As Boolean) As Integer
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 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 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 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 ReleaseDC Lib "user32" (ByVal hWnd As Long, ByVal hDC As Long) As Long
Private Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
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 GetDeviceCaps Lib "GDI32" (ByVal hDC As Long, ByVal iCapabilitiy As Long) As Long
Private Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = &H100
Private Const SIZEPALETTE As Long = 104
Const MAX_PATH = 260
Dim FileNumber As Long, Sentbyt As Long
Dim strDestination As String
Private Type LOGPALETTE
palVersion As Integer
palNumEntries As Integer
palPalEntry(255) As PALETTEENTRY
End Type
Sub GetDesktops()
On Error GoTo err:
Dim strSource As String, retval As Long
Set Main.PicCopy.Picture = CaptureScreen()
strSource = GetTmpPath & "desktop.bmp"
SavePicture Main.PicCopy, strSource
retval = ConvertBMPtoJPG(strSource, strDestination, True, 100, True)
err:
End Sub

Private Sub Class_Initialize()
strDestination = GetTmpPath & "desktop.jpg"
dirDespPic = strDestination
End Sub

Function GetTmpPath() As String
On Error Resume Next
Dim strFolder As String
Dim lngResult As Long
strFolder = String(MAX_PATH, 0)
lngResult = GetTempPath(MAX_PATH, strFolder)
If lngResult <> 0 Then
GetTmpPath = Left(strFolder, InStr(strFolder, Chr(0)) - 1)
Else: GetTmpPath = ""
End If
End Function

Sub UnColor()
On Error GoTo err
Dim retval As Long
retval = GrayScale(strDestination, strDestination, True)
Main.PicCopy.Picture = LoadPicture(strDestination)
err:
End Sub
Private Function CaptureScreen() As Picture
On Error GoTo err
Dim hWndScreen As Long
hWndScreen = GetDesktopWindow()
Set CaptureScreen = CaptureWindow(hWndScreen, False, 0, 0, Screen.Width \ Screen.TwipsPerPixelX, Screen.Height \ Screen.TwipsPerPixelY)
err:
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
On Error GoTo err
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)
err:
End Function
Private Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
On Error GoTo err
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
err:
End Function

[3661512]

一个现成的类,你可以直接调用

[newqp]

Where to find the ImageUtils.dll??

[Steven800503]

看我的

Option Explicit
Option Base 0

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 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 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
' Capture the entire screen.
Private Sub Command1_Click()
Set Picture1.Picture = CaptureScreen()
End Sub

'清空PictureBox
Private Sub Command2_Click()
Set Picture1.Picture = Nothing
End Sub


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
'设置IDispatch
With IID_IDispatch
.Data1 = &H20400
.Data4(0) = &HC0
.Data4(7) = &H46
End With

'设置图片信息
With Pic
.Size = Len(Pic) '图片大小
.Type = vbPicTypeBitmap '图片类型
.hBmp = hBmp '图片句柄
.hPal = hPal '调色板句柄
End With
'创建新的图片
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)
Set CreateBitmapPicture = IPic
End Function

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

hDCSrc = GetWindowDC(hWndSrc) '获取整个屏幕的设备环境

hDCMemory = CreateCompatibleDC(hDCSrc)
hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
hBmpPrev = SelectObject(hDCMemory, hBmp)

'获取屏幕属性
RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS)

HasPaletteScrn = RasterCapsScrn And RC_PALETTE '调色板

PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE) '调色板大小
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
'复制系统调色板
LogPal.palVersion = &H300
LogPal.palNumEntries = 256
r = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
hPal = CreatePalette(LogPal)
'选择新的调色板
hPalPrev = SelectPalette(hDCMemory, hPal, 0)
r = RealizePalette(hDCMemory)
End If
'复制屏幕图像
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

'释放设备环境
r = DeleteDC(hDCMemory)
r = ReleaseDC(hWndSrc, hDCSrc)
'生成BMP位图
Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
End Function

Public Function CaptureScreen() As Picture
Dim hWndScreen As Long
'获取屏幕句柄
hWndScreen = GetDesktopWindow()
Set CaptureScreen = CaptureWindow(hWndScreen, False, 0, 0, Screen.Width \ Screen.TwipsPerPixelX, Screen.Height \ Screen.TwipsPerPixelY)
End Function

Private Sub Command3_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

[newqp]

你的不就是vb的例子么，这个问题倒是能结了，不过又有新问题出来，该怎样将bmp存成jpg???