VB如何快带比较两幅位图

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虽然VB可以使用Point函数或API函数GetPiexl获得像素颜色，但速度较慢，同时，CSDN论坛里有几个朋友提出了图像比较的问题，为此，写了以下代码，希望能给有此需要的朋友一些启发：

Option Explicit '* <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a> * '* 程序名称：form1.frm '* 程序功能：快速比较两幅位图 '* 作者：lyserver '* 联系方式：<a href="http://code.js-code.com/tag/http/" target="_blank" class="keywords">http</a>://blog.csdn.net/lyserver '* <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a><a href="http://code.js-code.com/tag/" target="_blank" class="keywords">**</a> * Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long,ByVal dwCount As Long,lpBits As Any) As Long Private Declare Function GetOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ctAPI Lib "gdi32" Alias "GetOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ctA" (ByVal hOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct As Long,ByVal nCount As Long,lpOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct As Any) As Long Private Type BITMAP '14 bytes bmType As Long <a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idth As Long bmHeight As Long <a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idthBytes As Long bmPla<a href="http://code.js-code.com/tag/nes/" target="_blank" class="keywords">nes</a> As <a href="http://code.js-code.com/tag/Intege/" target="_blank" class="keywords">Intege</a>r bmBitsPixel As <a href="http://code.js-code.com/tag/Intege/" target="_blank" class="keywords">Intege</a>r bmBits As Long End Type '为了验证代码，故在窗体加载时<a href="http://code.js-code.com/tag/zidongsheng/" target="_blank" class="keywords">自动生</a>成两幅位图 Private Sub Form_Load() Dim Pic As PictureBox Me.ScaleMode = vbPixels Set Pic = Me.Control<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add("VB.PictureBox","Pic1") '动态加载PictureBox控件 Pic.ScaleMode = vbPixels Pic<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a><a href="http://code.js-code.com/tag/orders/" target="_blank" class="keywords">orders</a>tyle = 0 Pic.Appearance = 0 Pic.Move 0,100,100 '设置PictureBox控件高度和宽度均为100,左下角(100,100)将被忽略 Pic.AutoRedraw = True Pic.Circle (Pic.ScaleWidth / 2,Pic.ScaleWidth / 2),Pic.ScaleWidth / 2 '在控件上画一个正圆 SavePicture Pic.Image,"c:/旧圆<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@p" '保存为旧圆 Pic.Line (0,0)-(20,0) '从(0,0)到(20,0)画一条水平直线,终端点(20,0)被忽略 Pic.Line (10,10)-(20,20) '从(10,10)到(20,20)画一第斜线,20)被忽略 Pic.PSet (30,30) '在坐标点(30,30)画一个点 SavePicture Pic.Image,"c:/新圆<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@p" '保存为新圆 Me.Control<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Remove "Pic1" '删除PictureBox控件 End Sub '点击按钮后开始进行图像比较 Private Sub Command1_Click() Dim OldPic As stdole.IPictu<a href="http://code.js-code.com/tag/redis/" target="_blank" class="keywords">redis</a>p Dim NewPic As stdole.IPictu<a href="http://code.js-code.com/tag/redis/" target="_blank" class="keywords">redis</a>p Dim OldPicInfo As BITMAP,NewPicInfo As BITMAP Dim i As Long,j As Long,k As Long,c As Long Set OldPic = Me.Control<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add("VB.PictureBox","OldPic") '动态增加一个PictureBox控件 Set NewPic = Me.Control<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Add("VB.PictureBox","NewPic") '动态增加一个PictureBox控件 Set OldPic = LoadPicture("c:/旧圆<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@p") '打开原始图像文件 Set NewPic = LoadPicture("c:/新圆<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@p") '打开<a href="http://code.js-code.com/tag/jingguoxiugai/" target="_blank" class="keywords">经过修改</a>后的图像文件 GetOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ctAPI OldPic,Len(OldPicInfo),OldPicInfo '获得图像有关信息 GetOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ctAPI NewPic,Len(NewPicInfo),NewPicInfo If OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@BitsPixel <> NewPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@BitsPixel Or OldPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idth <> NewPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idth Or _ OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@Height <> OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@Height Then Exit Sub '如果两幅位图大小和颜色深度不一样则取消比较 c = OldPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idthBytes * OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@Height '获得图像数据字节数 <a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ct Case OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@BitsPixel '根据图像颜色深度分别处理 Case 24 '比较24位真彩色，此为VB默认位图格式 Dim OldData24() As Byte Dim NewData24() As Byte ReDim OldData24(c - 1) As Byte ReDim NewData24(c - 1) As Byte GetBitmapBits OldPic,c,OldData24(0) GetBitmapBits NewPic,NewData24(0) For i = 0 To OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@Height - 1 '垂直坐标 For j = 0 To OldPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idth - 1 '水平坐标 k = i * OldPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idthBytes + j * 3 If OldData24(k) <> NewData24(k) Or OldData24(k + 1) <> NewData24(k + 1) Or _ OldData24(k + 2) <> NewData24(k + 2) Then Debug.Print "第" & i & "行第" & j & "列像素值不同" End If Next Next Erase OldData24 Erase NewData24 Case 32 '比较32位真彩色 Dim OldData32() As Long Dim NewData32() As Long ReDim OldData32(c / 4 - 1) As Long ReDim NewData32(c / 4 - 1) As Long GetBitmapBits OldPic,OldData32(0) GetBitmapBits NewPic,NewData32(0) For i = 0 To OldPicInfo<a href="http://code.js-code.com/tag/b/" target="_blank" class="keywords">.b</a>R_12_11845@Height - 1 '垂直坐标 For j = 0 To OldPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idth - 1 '水平坐标 k = i * OldPicInfo.<a href="http://code.js-code.com/tag/BMW/" target="_blank" class="keywords">BMW</a>idthBytes + j If OldData32(k) <> NewData32(k) Then Debug.Print "第" & i & "行第" & j & "列像素值不同" End If Next Next Erase OldData32 Erase NewData32 Case Else '其它格式暂不处理 End <a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ct Me.Control<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Remove "OldPic" Me.Control<a href="http://code.js-code.com/tag/s/" target="_blank" class="keywords">s.</a>Remove "NewPic" Set OldPic = Nothing Set NewPic = Nothing End Sub

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