获取图片宽度和高度的ASP类代码,ASP代码库,德仔网

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【ASP】获取图片宽度和高度的ASP类
作者:Dezai.CN / 发布于2013/8/6/ 1548

	<%
	Class ImgWHInfo '获取图片宽度和高度的类，支持JPG，GIF，PNG，BMP
	 Dim ASO
	 Private Sub Class_Initialize
	 Set ASO=Server.CreateObject("ADODB.Stream")
	 ASO.Mode=3
	 ASO.Type=1
	 ASO.Open
	 End Sub
	 Private Sub Class_Terminate
	 Err.Clear
	 Set ASO=Nothing
	 End Sub
	 Private Function Bin2Str(Bin)
	 Dim I, Str
	 For I=1 To LenB(Bin)
	 clow=MidB(Bin,I,1)
	 If ASCB(clow)<128 Then
	 Str = Str & Chr(ASCB(clow))
	 Else
	 I=I+1
	 If I <= LenB(Bin) Then Str = Str & Chr(ASCW(MidB(Bin,I,1)&clow))
	 End If
	 Next
	 Bin2Str = Str
	 End Function
	
	 Private Function Num2Str(Num,Base,Lens)
	 Dim Ret
	 Ret = ""
	 While(Num>=Base)
	 Ret = (Num Mod Base) & Ret
	 Num = (Num - Num Mod Base)/Base
	 Wend
	 Num2Str = Right(String(Lens,"0") & Num & Ret,Lens)
	 End Function
	
	 Private Function Str2Num(Str,Base)
	 Dim Ret,I
	 Ret = 0
	 For I=1 To Len(Str)
	 Ret = Ret *base + Cint(Mid(Str,I,1))
	 Next
	 Str2Num=Ret
	 End Function
	
	 Private Function BinVal(Bin)
	 Dim Ret,I
	 Ret = 0
	 For I = LenB(Bin) To 1 Step -1
	 Ret = Ret *256 + AscB(MidB(Bin,I,1))
	 Next
	 BinVal=Ret
	 End Function
	
	 Private Function BinVal2(Bin)
	 Dim Ret,I
	 Ret = 0
	 For I = 1 To LenB(Bin)
	 Ret = Ret *256 + AscB(MidB(Bin,I,1))
	 Next
	 BinVal2=Ret
	 End Function
	
	 Private Function GetImageSize(filespec)
	 Dim bFlag
	 Dim Ret(3)
	 ASO.LoadFromFile(filespec)
	 bFlag=ASO.Read(3)
	 Select Case Hex(binVal(bFlag))
	 Case "4E5089":
	 ASO.Read(15)
	 ret(0)="PNG"
	 ret(1)=BinVal2(ASO.Read(2))
	 ASO.Read(2)
	 ret(2)=BinVal2(ASO.Read(2))
	 Case "464947":
	 ASO.read(3)
	 ret(0)="gif"
	 ret(1)=BinVal(ASO.Read(2))
	 ret(2)=BinVal(ASO.Read(2))
	 Case "535746":
	 ASO.read(5)
	 binData=ASO.Read(1)
	 sConv=Num2Str(ascb(binData),2 ,8)
	 nBits=Str2Num(left(sConv,5),2)
	 sConv=mid(sConv,6)
	 While(len(sConv)<nBits*4)
	 binData=ASO.Read(1)
	 sConv=sConv&Num2Str(AscB(binData),2 ,8)
	 Wend
	 ret(0)="SWF"
	 ret(1)=Int(Abs(Str2Num(Mid(sConv,1*nBits+1,nBits),2)-Str2Num(Mid(sConv,0*nBits+1,nBits),2))/20)
	 ret(2)=Int(Abs(Str2Num(Mid(sConv,3*nBits+1,nBits),2)-Str2Num(Mid(sConv,2*nBits+1,nBits),2))/20)
	 Case "FFD8FF":
	 Do
	 Do: p1=binVal(ASO.Read(1)): Loop While p1=255 And Not ASO.EOS
	 If p1>191 And p1<196 Then Exit Do Else ASO.read(binval2(ASO.Read(2))-2)
	 Do:p1=binVal(ASO.Read(1)):Loop While p1<255 And Not ASO.EOS
	 Loop While True
	 ASO.Read(3)
	 ret(0)="JPG"
	 ret(2)=binval2(ASO.Read(2))
	 ret(1)=binval2(ASO.Read(2))
	 Case Else:
	 If left(Bin2Str(bFlag),2)="BM" Then
	 ASO.Read(15)
	 ret(0)="BMP"
	 ret(1)=binval(ASO.Read(4))
	 ret(2)=binval(ASO.Read(4))
	 Else
	 ret(0)=""
	 End If
	 End Select
	 ret(3)="width=""" & ret(1) &""" height=""" & ret(2) &""""
	 getimagesize=ret
	 End Function
	
	 Public Function imgW(IMGPath)
	 Dim FSO,IMGFile,FileExt,Arr
	 Set FSO = Server.CreateObject("Scripting.FileSystemObject")
	 If (FSO.FileExists(IMGPath)) Then
	 Set IMGFile = FSO.GetFile(IMGPath)
	 FileExt=FSO.GetExtensionName(IMGPath)
	 Select Case FileExt
	 Case "gif","bmp","jpg","png":
	 Arr=GetImageSize(IMGFile.Path)
	 imgW = Arr(1)
	 End Select
	 Set IMGFile=Nothing
	 Else
	 imgW = 0
	 End If
	 Set FSO=Nothing
	 End Function
	
	 Public Function imgH(IMGPath)
	 Dim FSO,IMGFile,FileExt,Arr
	 Set FSO = server.CreateObject("Scripting.FileSystemObject")
	 If (FSO.FileExists(IMGPath)) Then
	 Set IMGFile = FSO.GetFile(IMGPath)
	 FileExt=FSO.GetExtensionName(IMGPath)
	 Select Case FileExt
	 Case "gif","bmp","jpg","png":
	 Arr=getImageSize(IMGFile.Path)
	 imgH = Arr(2)
	 End Select
	 Set IMGFile=Nothing
	 Else
	 imgH = 0
	 End If
	 Set FSO=Nothing
	 End Function
	End Class
	IMGPath="jiaoyu.jpg"
	Call ShowImg(IMGPath)
	Sub ShowImg(IMGPath)
	 Set PP = New ImgWHInfo
	 W = PP.imgW(Server.Mappath(IMGPath))
	 H = PP.imgH(Server.Mappath(IMGPath))
	 Set pp = Nothing
	 Response.Write("<img src='"&IMGPath&"' border=0>宽:"&W&";高:"&H)
	End Sub
	%>
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