ASP中取得图片宽度和高度的类(无组件)
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- 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="next.gif"
- 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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