ASP中取得图片宽度和高度的类（无组件）

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ClassImgWHInfo'获取图片宽度和高度的类，支持JPG，GIF，PNG，BMP

DimASO

PrivateSubClass_Initialize

SetASO=Server.CreateObject("ADODB.Stream")

ASO.Mode=3

ASO.Type=1

ASO.Open

EndSub

PrivateSubClass_Terminate

Err.Clear

SetASO=Nothing

EndSub

PrivateFunctionBin2Str(Bin)

DimI,Str

ForI=1ToLenB(Bin)

clow=MidB(Bin,I,1)

IfASCB(clow)<128Then

Str=Str&Chr(ASCB(clow))

Else

I=I+1

IfI<=LenB(Bin)ThenStr=Str&Chr(ASCW(MidB(Bin,I,1)&clow))

EndIf

Next

Bin2Str=Str

EndFunction

PrivateFunctionNum2Str(Num,Base,Lens)

DimRet

Ret=""

While(Num>=Base)

Ret=(NumModBase)&Ret

Num=(Num-NumModBase)/Base

Wend

Num2Str=Right(String(Lens,"0")&Num&Ret,Lens)

EndFunction

PrivateFunctionStr2Num(Str,Base)

DimRet,I

Ret=0

ForI=1ToLen(Str)

Ret=Ret*base+Cint(Mid(Str,I,1))

Next

Str2Num=Ret

EndFunction

PrivateFunctionBinVal(Bin)

DimRet,I

Ret=0

ForI=LenB(Bin)To1Step-1

Ret=Ret*256+AscB(MidB(Bin,I,1))

Next

BinVal=Ret

EndFunction

PrivateFunctionBinVal2(Bin)

DimRet,I

Ret=0

ForI=1ToLenB(Bin)

Ret=Ret*256+AscB(MidB(Bin,I,1))

Next

BinVal2=Ret

EndFunction

PrivateFunctionGetImageSize(filespec)

DimbFlag

DimRet(3)

ASO.LoadFromFile(filespec)

bFlag=ASO.Read(3)

SelectCaseHex(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)):LoopWhilep1=255AndNotASO.EOS

Ifp1>191Andp1<196ThenExitDoElseASO.read(binval2(ASO.Read(2))-2)

Do:p1=binVal(ASO.Read(1)):LoopWhilep1<255AndNotASO.EOS

LoopWhileTrue

ASO.Read(3)

ret(0)="JPG"

ret(2)=binval2(ASO.Read(2))

ret(1)=binval2(ASO.Read(2))

CaseElse:

Ifleft(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)=""

EndIf

EndSelect

ret(3)="width="""&ret(1)&"""height="""&ret(2)&""""

getimagesize=ret

EndFunction

PublicFunctionimgW(IMGPath)

DimFSO,IMGFile,FileExt,Arr

SetFSO=Server.CreateObject("Scripting.FileSystemObject")

If(FSO.FileExists(IMGPath))Then

SetIMGFile=FSO.GetFile(IMGPath)

FileExt=FSO.GetExtensionName(IMGPath)

SelectCaseFileExt

Case"gif","bmp","jpg","png":

Arr=GetImageSize(IMGFile.Path)

imgW=Arr(1)

EndSelect

SetIMGFile=Nothing

Else

imgW=0

EndIf

SetFSO=Nothing

EndFunction

PublicFunctionimgH(IMGPath)

DimFSO,IMGFile,FileExt,Arr

SetFSO=server.CreateObject("Scripting.FileSystemObject")

If(FSO.FileExists(IMGPath))Then

SetIMGFile=FSO.GetFile(IMGPath)

FileExt=FSO.GetExtensionName(IMGPath)

SelectCaseFileExt

Case"gif","bmp","jpg","png":

Arr=getImageSize(IMGFile.Path)

imgH=Arr(2)

EndSelect

SetIMGFile=Nothing

Else

imgH=0

EndIf

SetFSO=Nothing

EndFunction

EndClass

IMGPath="next.gif"

SetPP=NewImgWHInfo

W=PP.imgW(Server.Mappath(IMGPath))

H=PP.imgH(Server.Mappath(IMGPath))

Setpp=Nothing

Response.Write("<imgsrc='"&IMGPath&"'border=0><br>宽:"&W&";高:"&H)

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