小弟想在vb中点击“保存“按钮时,将整个界面的图像都保存到画图板中,类似于键盘上的全屏拷贝的功能,请问该如何才能实现?有兄弟做过这样的东西吗?能不能给个参考!
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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 LongPrivate Sub Form_Load()
Dim hBitmap As Integer
Me.AutoRedraw = True
hBitmap = CreateCompatibleBitmap(Me.hdc, 0, 0)
SelectObject Me.hdc, hBitmap
End Sub ===================================================声明:
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long,
ByVal hdc As Long) As Long
Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd As Long)
As Long
Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat As
Long, ByVal hMem 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 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 CreateDC Lib "gdi32" Alias "CreateDCA" (ByVal
lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As
String, lpInitData 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 CloseClipboard Lib "user32" () As Long
函数:
Sub ScrnCap(Lt, Top, Rt, Bot)
rWidth = Rt - Lt
rHeight = Bot - Top
SourceDC = CreateDC("DISPLAY", 0, 0, 0)
DestDC = CreateCompatibleDC(SourceDC)
BHandle = CreateCompatibleBitmap(SourceDC, rWidth, rHeight)
SelectObject DestDC, BHandle
BitBlt DestDC, 0, 0, rWidth, rHeight, SourceDC, Lt, Top, &HCC0020
Wnd = Screen.ActiveForm.hwnd
OpenClipboard Wnd
EmptyClipboard
SetClipboardData 2, BHandle
CloseClipboard
DeleteDC DestDC
ReleaseDC DHandle, SourceDC
End Sub以下的示例把屏幕图象捕捉后,放到Picture1 中。
Sub Command1_Click()
Form1.Visible = False
ScrnCap 0, 0, 640, 480
Form1.Visible = True
picture1 = Clipboard.GetData()
End Sub
首先来看源程序,先建立一个新的工程文件,然后在Form1中加入5个CommandButton对象和一个PictureBox对象,然后在Form1中加入以下代码:
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
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
'捕捉整个屏幕
Private Sub Command1_Click()
Set Picture1.Picture = CaptureScreen()
End Sub
'在两秒钟后捕捉当前的活动窗口
Private Sub Command2_Click()
MsgBox“当你关闭这个对话框两秒钟之后程序会捕捉处于活动状态的窗口。"
'等待两秒钟
Dim EndTime As Date
EndTime = DateAdd(“s", 2, Now)
Do Until Now > EndTime
DoEvents
Loop
Set Picture1.Picture = CaptureActiveWindow()
Me.SetFocus
End Sub
Private Sub Command3_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
'填充IDispatch界面
With IID_IDispatch
.Data1 = &H20400
.Data4(0) = &HC0
.Data4(7) = &H46
End With
'填充Pic
With Pic
.Size = Len(Pic)
' Pic结构长度
.Type = vbPicTypeBitmap
' 图像类型
.hBmp = hBmp
' 位图句柄
.hPal = hPal
' 调色板句柄
End With
’建立Picture图像
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)
'返回Picture对象
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
If Client Then
hDCSrc = GetDC(hWndSrc)
Else
hDCSrc = GetWindowDC(hWndSrc)
End If
hDCMemory = CreateCompatibleDC(hDCSrc)
hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
hBmpPrev = SelectObject(hDCMemory, hBmp)
'获得屏幕属性
RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS)
HasPaletteScrn = RasterCapsScrn And RC_PALETTE
PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE)
'如果屏幕对象有调色板则获得屏幕调色板
If HasPaletteScrn And (PaletteSizeScrn = 256) Then
'建立屏幕调色板的拷贝
LogPal.palVersion = &H300
LogPal.palNumEntries = 256
r = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
hPal = CreatePalette(LogPal)
'将新建立的调色板选如建立的内存绘图句柄中
hPalPrev = SelectPalette(hDCMemory, hPal, 0)
r = RealizePalette(hDCMemory)
End If
'拷贝图像
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
'释放资源
r = DeleteDC(hDCMemor