ASP 程序获取图片宽度和高度

作者: 来源: 日期:2007-2-6

<%
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="Test.jpg"
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><br>宽:"&W&";高:"&H)
%>

 

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