Option Explicit
Private Type POINTAPI
X As Long
Y As Long
End Type
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function StretchBlt Lib "gdi32" (ByVal hdc 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 nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Private Const SRCCOPY = &HCC0020
'Private Const SWP_NOMOVE = &H2
'Private Const SWP_NOSIZE = &H1
'Private Const HWND_TOPMOST = -1
Private Const Flags = &H2 Or &H1
Dim Pos As POINTAPIPrivate Sub Form_Load()
Form1.ScaleMode = 3
SetWindowPos Me.hwnd, -1, 0, 0, 0, 0, Flags
HScroll1.Max = 59
HScroll1.Min = 1
HScroll1.LargeChange = 5
HScroll1.SmallChange = 1
End Sub
Private Sub Form_Resize()
Text1.Width = 800 'Me.ScaleX(Me.Width, 1, 3) - 9
Text1.Height = 600 'Me.ScaleY(Me.Height, 1, 3) - 50
HScroll1.Width = Text1.Width
HScroll1.Top = Text1.Height + 7
End SubPrivate Sub AddSee(倍数 As Single, ShowObj As Object)
Dim Sx As Integer
Dim Sy As Integer
Dim ShowW As Long
Dim ShowH As Long
Dim PicW As Long
Dim PicH As Long
PicW = ShowObj.Width
PicH = ShowObj.Height
GetCursorPos Pos
ShowW = PicW / 倍数
ShowH = ShowW * (PicH / PicW)
Sx = IIf(Pos.X < ShowW / 2 Or Pos.X > 800 - ShowW / 2, IIf(Pos.X < ShowW / 2, 0, 800 - ShowW), Pos.X - ShowW / 2)
Sy = IIf(Pos.Y < ShowH / 2 Or Pos.Y > 600 - ShowH / 2, IIf(Pos.Y < ShowH / 2, 0, 600 - ShowH), Pos.Y - ShowH / 2)
StretchBlt GetDC(ShowObj.hwnd), 0, 0, PicW, PicH, GetDC(0), Sx, Sy, 800, 600, SRCCOPY
End SubPrivate Sub Command1_Click()
AddSee HScroll1.Value, Text1
SavePicture Me.Text1.Image, App.Path & "\1.bmp" '<==== 它怎么保存的图片是空的?
End Sub
Private Type POINTAPI
X As Long
Y As Long
End Type
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function StretchBlt Lib "gdi32" (ByVal hdc 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 nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Private Const SRCCOPY = &HCC0020
'Private Const SWP_NOMOVE = &H2
'Private Const SWP_NOSIZE = &H1
'Private Const HWND_TOPMOST = -1
Private Const Flags = &H2 Or &H1
Dim Pos As POINTAPIPrivate Sub Form_Load()
Form1.ScaleMode = 3
SetWindowPos Me.hwnd, -1, 0, 0, 0, 0, Flags
HScroll1.Max = 59
HScroll1.Min = 1
HScroll1.LargeChange = 5
HScroll1.SmallChange = 1
End Sub
Private Sub Form_Resize()
Text1.Width = 800 'Me.ScaleX(Me.Width, 1, 3) - 9
Text1.Height = 600 'Me.ScaleY(Me.Height, 1, 3) - 50
HScroll1.Width = Text1.Width
HScroll1.Top = Text1.Height + 7
End SubPrivate Sub AddSee(倍数 As Single, ShowObj As Object)
Dim Sx As Integer
Dim Sy As Integer
Dim ShowW As Long
Dim ShowH As Long
Dim PicW As Long
Dim PicH As Long
PicW = ShowObj.Width
PicH = ShowObj.Height
GetCursorPos Pos
ShowW = PicW / 倍数
ShowH = ShowW * (PicH / PicW)
Sx = IIf(Pos.X < ShowW / 2 Or Pos.X > 800 - ShowW / 2, IIf(Pos.X < ShowW / 2, 0, 800 - ShowW), Pos.X - ShowW / 2)
Sy = IIf(Pos.Y < ShowH / 2 Or Pos.Y > 600 - ShowH / 2, IIf(Pos.Y < ShowH / 2, 0, 600 - ShowH), Pos.Y - ShowH / 2)
StretchBlt GetDC(ShowObj.hwnd), 0, 0, PicW, PicH, GetDC(0), Sx, Sy, 800, 600, SRCCOPY
End SubPrivate Sub Command1_Click()
AddSee HScroll1.Value, Text1
SavePicture Me.Text1.Image, App.Path & "\1.bmp" '<==== 它怎么保存的图片是空的?
End Sub
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StretchBlt画出来的东西好像是在picture属性里的。
问题依旧!!
试一下
是 AutoRedraw 吧,我试过,图像一闪就没了。
peRed As Byte
peGreen As Byte
peBlue As Byte
peFlags As Byte
End TypePrivate Type LOGPALETTE
palVersion As Integer
palNumEntries As Integer
palPalEntry(255) As PALETTEENTRY
End TypePrivate Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End TypePrivate Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = &H100
Private Const SIZEPALETTE As Long = 104Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End TypePrivate 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 LongPrivate Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End TypePrivate Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As _
PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPictureDisp) As Long'capturescreen函数捕捉整个屏幕图象
Public Function CaptureScreen() As Picture
Dim hWndScreen As Long '获得桌面的窗口句柄
hWndScreen = GetDesktopWindow()
Set CaptureScreen = CaptureWindow(hWndScreen, False, 0, 0, Screen.Width _
\ Screen.TwipsPerPixelX, Screen.Height \ Screen.TwipsPerPixelY)
End FunctionPublic 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 '拷贝图象
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(hDCMemory)
r = ReleaseDC(hWndSrc, hDCSrc) Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
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 '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 ' 图象类型
.hBmp = hBmp ' 位图句柄
.hPal = hPal ' 调色板句柄
End With '建立Picture图象
r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic) '返回Picture对象
Set CreateBitmapPicture = IPic
End Function
'用法:
Set picGet.Picture = CaptureScreen() SavePicture picGet.Picture , strBmpFile
For i = 1 To 50
DoEvents
Set picGet.Picture = CaptureScreen()
Next我的目的是避免停滞。
你可以用timer来试试看。
ShowObj.AutoReDraw = True
ShowObj.ScaleMode = vbPixels
StretchBlt ShowObj.hdc, 0, 0, PicW, PicH, GetDC(0), Sx, Sy, 800, 600, SRCCOPY
这样应该没有问题了