文件上传 – 以经典的asp上传文件

我一直使用以下脚本以经典的asp上传文件，但是它停止工作，给我这个错误

vbscript runtime error 800a01a8
object required ‘Item(…)’

我调查了一点，我认为问题是在文件upload.asp与功能BuildUploadRequest，但我真的不明白为什么

形成

<form method="POST" action="landing-page.asp" ENCTYPE="multipart/form-data">
    <input type="file" name="file">
    <input type="hidden" name="key" value="0">
    <input type="submit" name="send" value="1">
</form>

表格登陆的页面

byteCount = Request.TotalBytes
RequestBin = Request.BinaryRead(byteCount)

Dim UploadRequest
Set UploadRequest = CreateObject("Scripting.Dictionary")
BuildUploadRequest(RequestBin)  '//function defined in upload.asp
if UploadRequest.Item("key").Item("Value")="0" then  '//this is the line giving the error
    '//code here...
end if

upload.asp

Sub BuildUploadRequest(RequestBin)
    PosBeg = 1  
    PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(13)))
    boundary = MidB(RequestBin,PosBeg,PosEnd-PosBeg)    
    boundaryPos = InstrB(1,boundary)

    '//Get all data inside the boundaries
    Do until (boundaryPos=InstrB(RequestBin,boundary & getByteString("--")))
        '//Members variable of objects are put in a dictionary object
        Dim UploadControl
        Set UploadControl = CreateObject("Scripting.Dictionary")
        '//Get an object name
        Pos = InstrB(BoundaryPos,getByteString("Content-Disposition"))
        Pos = InstrB(Pos,getByteString("name="))
        PosBeg = Pos+6
        PosEnd = InstrB(PosBeg,getByteString(chr(34)))
        Name = getString(MidB(RequestBin,PosEnd-PosBeg))
        PosFile = InstrB(BoundaryPos,getByteString("filename="))
        PosBound = InstrB(PosEnd,boundary)
        '//Test if object is of file type
        If  PosFile<>0 AND (PosFile<PosBound) Then
            '//Get Filename,content-type and content of file
            PosBeg = PosFile + 10
            PosEnd =  InstrB(PosBeg,getByteString(chr(34)))
            FileName = getString(MidB(RequestBin,PosEnd-PosBeg))
            '//Add filename to dictionary object
            UploadControl.Add "FileName",FileName
            Pos = InstrB(PosEnd,getByteString("Content-Type:"))
            PosBeg = Pos+14
            PosEnd = InstrB(PosBeg,getByteString(chr(13)))
            '//Add content-type to dictionary object
            ContentType = getString(MidB(RequestBin,PosEnd-PosBeg))
            UploadControl.Add "ContentType",ContentType
            '//Get content of object
            PosBeg = PosEnd+4
            PosEnd = InstrB(PosBeg,boundary)-2
            Value = MidB(RequestBin,PosEnd-PosBeg)
        Else
            '//Get content of object
            Pos = InstrB(Pos,getByteString(chr(13)))
            PosBeg = Pos+4
            PosEnd = InstrB(PosBeg,boundary)-2
            Value = getString(MidB(RequestBin,PosEnd-PosBeg))
        End If
        '//Add content to dictionary object
        UploadControl.Add "Value",Value   
        '//Add dictionary object to main dictionary
        '//response.write name & "<br>"
        UploadRequest.Add name,UploadControl   
        '//Loop to next object
        BoundaryPos=InstrB(BoundaryPos+LenB(boundary),boundary)
    Loop
End Sub

'//String to byte string conversion
Function getByteString(StringStr)
  For i = 1 to Len(StringStr)
    charx = Mid(StringStr,i,1)
    getByteString = getByteString & chrB(AscB(charx))
  Next
End Function

'//Byte string to string conversion
Function getString(StringBin)
 getString =""
 For intCount = 1 to LenB(StringBin)
    getString = getString & chr(AscB(MidB(StringBin,intCount,1))) 
 Next
End Function

这个代码在每一个项目中一直运行正常，但是现在它无处不在。所以我不能只是编辑和使用另一个功能，我需要明白为什么它不再工作了

解决方法

修复#2 – 将所有字节数组复制到一个字节值字符串中，并针对该字符串进行处理，或提供对instrb进行自身迭代的替代。

Function InstrBNew(startPos,inputArray,searchChar)

  if LenB(searchChar) = 1 Then
    Dim loc
    For loc = startPos to Lenb(inputArray)
      if MidB(inputArray,loc,1) = searchChar then Exit For
    Next
    InstrBNew = loc
  Else
    InstrBNew = InstrB(startPos,searchChar)
  End If
End Function

修复#3 – Microsoft已经发布了一个修补程序。这将在2016年1月份出现给大家。你可以在这里早点解决。 https://support.microsoft.com/en-us/kb/3125446

问题似乎是，在以下条件下，vbScript中的InstrB函数现在返回值为1。

>当您搜索字节数组(如Response.BinaryRead)时。这在ASP或VBScript中不是很常见，但文件上传是您正在做的时间之一。
>当您搜索单个字节时

如果您正在搜索字符串，或者正在搜索多字节模式，则InstrB正常工作。

PosEnd = InstrB(PosBeg,ByteArray,chrb(13))

在我的破碎的系统上，即使在位置1没有字节值13，这个函数总是返回1，当搜索字节数组时，它返回1。经典的ASP文件上传组件，这就是为什么我们都在这个线程上，遇到这种情况，因为他们正在解析字节数组寻找分隔符。

PosEnd = InstrB(PosBeg,getByteString("FormBoundary"))
PosEnd = InstrB(PosBeg,getByteString(vbCRLF))
PosEnd = InstrB(PosBeg,"Normal string",chrb(103)) ' Search for letter g in a string

这些以上线条正常工作正常。预期多字节搜索和匹配字符串工作。

昨天晚上，这个问题同时发生在多台服务器上。我看到Windows系统的更新也在晚上跑了。缩小，我发现MS15-124(KB3104002 IE11的累积安全更新)包含vbscript.dll的更新。我删除了这个更新，现在代码恢复正常工作。

我提交了一个问题在他们的“IE连接”系统，因为它被包括在一个IE更新，但我不知道这是否是正确的地方。

我附上了一个测试用例。在破碎的系统上，它将返回“5，1，5”。在工作系统上，将返回“5，5，5”

希望修复这些旧代码中的一些在我无法访问的系统上运行。

' Test.vbs
Dim byteArray,byteArray2,byteArray3,bPosition
Dim responseText

' byte string
' "hello hello"
byteArray = chrb(104) & chrb(101) & chrb(108) & chrb(108) & chrb(111) & chrb(32) & chrb(104) & chrb(101) & chrb(108) & chrb(108) & chrb(111) & chrb(0)

' byte array - What Response.BinaryRead is
byteArray2 = TextToBytes(byteArray)

' Vartype: http://stackoverflow.com/questions/3281355/get-the-type-of-a-variable-in-vbscript
ResponseText = ResponseText + "blen: " & lenb(byteArray) & vbCRLF
ResponseText = ResponseText + "type: " & vartype(byteArray) & vbCRLF

ResponseText = ResponseText + "blen: " & lenb(byteArray2) & vbCRLF
ResponseText = ResponseText + "type: " & vartype(byteArray2) & vbCRLF

bPosition = instrb(1,byteArray,chrb(111))
ResponseText = ResponseText + "Position in string: " & bPosition & vbCRLF

bPosition = instrb(1,chrb(111))
ResponseText = ResponseText + "Position in byte array: " & bPosition & vbCRLF

bPosition = instrb(1,chrb(111) & chrb(32))
ResponseText = ResponseText + "Position in byte array: " & bPosition & vbCRLF

WScript.Echo ResponseText

' Converts a string (8) to a vbArray of bytes (8192 + 17)
' I'm not sure how else to create a vbArray of bytes. It does not seem to be a common data type in vbscript
Private Function TextToBytes(ByRef pbinBinaryData)
    Dim lobjRs
    Dim llngLength
    Dim lbinBuffer
    CONST adLongVarBinary = 205
    llngLength = LenB(pbinBinaryData)
    Set lobjRs = CreateObject("ADODB.Recordset")
    Call lobjRs.Fields.Append("BinaryData",adLongVarBinary,llngLength)
    Call lobjRs.Open()
    Call lobjRs.AddNew()
    Call lobjRs.Fields("BinaryData").AppendChunk(pbinBinaryData)
    Call lobjRs.Update()
    lbinBuffer = lobjRs.Fields("BinaryData").GetChunk(llngLength)
    Call lobjRs.Close()
    Set lobjRs = Nothing
    TextToBytes = lbinBuffer
End Function

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