form1





Private Sub Command_Click()

With Picture1
.AutoRedraw = True
.ScaleMode = 3
.BorderStyle = 0
DibGet .hdc,.ScaleWidth,.ScaleHeight
End With

With Picture2
.AutoRedraw = True
.ScaleMode = 3
.BorderStyle = 0
.Width = Picture1.Width
.Height = Picture1.Height
End With

CopyData InPutHei,InPutWid
Picture2.AutoRedraw = True
DIBPut Picture2.hdc
Picture2.Refresh
End Sub






module1



Option Explicit

'删除一个DC
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
'删除一个对象
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
'获得指定类型的当前选定对象
Private Declare Function GetCurrentObject Lib "gdi32" (ByVal hdc As Long,ByVal uObjectType As Long) As Long
'获取DIB
Private Declare Function GetDIBits Lib "gdi32" (ByVal aHDC As Long,ByVal hBitmap As Long,ByVal nStartScan As Long,ByVal nNumScans As Long,lpBits As Any,lpBI As BitMapInfo,ByVal wUsage As Long) As Long
'获取系统时间
Private Declare Function timeGetTime Lib "winmm.dll" () As Long
Public Declare Function SetDIBitsToDevice Lib "gdi32" (ByVal hdc As Long,ByVal x As Long,ByVal y As Long,ByVal dx As Long,ByVal dy As Long,ByVal SrcX As Long,ByVal SrcY As Long,ByVal Scan As Long,ByVal NumScans As Long,Bits As Any,BitsInfo As BitMapInfo,ByVal wUsage As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDest As Any,pSrc As Any,ByVal ByteLen As Long)
Private Declare Function SetPixel Lib "gdi32" (ByVal hdc As Long,ByVal crColor As Long) As Long


Private Const Bits As Long = 32 '颜色深度，这里把所有图像都按照32位来处理



'文件信息头——BITMAPINFOHEADER
Private Type BitMapInfoHeader
biSize As Long '位图大小
biWidth As Long '宽度
biHeight As Long '长度
biPlanes As Integer '
biBitCount As Integer '信息头长度
biCompression As Long '压缩方式
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type

'颜色表
Private Type RGBQuad
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
'rgbReserved As Byte
End Type

'位图信息头
Private Type BitMapInfo
bmiHeader As BitMapInfoHeader
bmiColors As RGBQuad
End Type



Public Done As Boolean '用于标记一个过程是否结束
Public TimeGet As Long '用于记录输入过程处理所花费的时间
Public TimePut As Long '用于记录输出过程处理所花费的时间
Dim ColVal() As Byte '用于存放从DIB输入的像素值
Dim ColOut() As Byte '用于存放向DIB输出的像素值
Public InPutHei As Long '用于记录输入图像的高度
Public InPutWid As Long '用于记录输入图像的宽度
Dim bi24BitInfo As BitMapInfo '定义BMP信息

Public Sub DibGet(ByVal IdSource As Long,XBegin As Long,ByVal YBegin As Long,ByVal XEnd As Long,ByVal YEnd As Long)
Dim iBitmap As Long
Dim iDC As Long
Dim i As Long
Dim w As Long
Dim H As Long

On Error GoTo ErrLine
Done = False
TimeGet = timeGetTime '获取系统时间
InPutWid = XEnd - XBegin
InPutHei = YEnd - YBegin

w = InPutWid + 1
H = InPutHei + 1

i = (Bits \ 8) - 1
ReDim ColVal(i,InPutWid,InPutHei)

With bi24BitInfo.bmiHeader
.biBitCount = Bits
.biCompression = 0&
.biPlanes = 1
.biSize = Len(bi24BitInfo.bmiHeader)
.biWidth = w
.biHeight = H
End With

iBitmap = GetCurrentObject(IdSource,7&)





GetDIBits IdSource,iBitmap,0&,H,ColVal(0,0),bi24BitInfo,0&




DeleteObject iBitmap

Done = True

TimeGet = timeGetTime - TimeGet
Exit Sub
ErrLine:
MsgBox "错误号：" & Err.Number & "：" & Err.Description
End Sub


Public Sub DIBPut(ByVal IdDestination As Long)
Dim w As Long
Dim H As Long
Dim LineBytes As Long
On Error GoTo ErrLine
Done = False
TimePut = timeGetTime

w = InPutWid + 1
H = InPutHei + 1

With bi24BitInfo.bmiHeader
.biWidth = w
.biHeight = H
LineBytes = ((w * Bits + 31) And &HFFFFFFE0) \ 8
.biSizeImage = LineBytes * H
End With
'SetDIBitsToDevice IdDestination,W,ColOut(0,bi24BitInfo.bmiHeader,0
SetDIBitsToDevice IdDestination,w,0
Done = True
TimePut = timeGetTime - TimePut
Exit Sub


ErrLine:
MsgBox Err.Description




End Sub

Public Sub CopyData(ByVal w As Long,ByVal H As Long)

Dim Length As Long
Dim i As Long
Dim L As Long
i = Bits \ 8
L = i - 1
Length = (w + 1&) * (H + 1&) * i
ReDim ColOut(L,H)

CopyMemory ColOut(0,Length


End Sub

摘自一个技术馆