中文XML论坛--不用组件上载文件代码段（一）

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下面将介绍一系列可以不用组件，而使用纯粹的ASP代码来上传文件

呵呵，我想这将给很多拥有个人主页的网友带来极大的方便。

这个纯ASP代码由三个包含文件组成，代码中只使用了FileSystemObject

和Direction两个ASP固有对象。而不需要任何附加的组件，注意，为了保证

这段代码的出处，我没有对代码中的任何地方进行过修改。

希望能够对大家有所帮助：

文件fupload.inc

'Sample multiple binary files upload via ASP - upload include

'c1997-1999 Antonin Foller, PSTRUH Software, http://www.pstruh.cz

'The file is part of ScriptUtilities library

'The file enables http upload to ASP without any components.

'But there is a small problem - ASP does not allow save binary data to the disk.

' So you can use the upload for :

' 1. Upload small text (or HTML) files to server-side disk (Save the data by filesystem object)

' 2. Upload binary/text files of any size to server-side database (RS("BinField") = Upload("FormField").Value

'Limit of upload size

Dim UploadSizeLimit

'********************************** GetUpload **********************************

'This function reads all form fields from binary input and returns it as a dictionary object.

'The dictionary object containing form fields. Each form field is represented by six values :

'.Name name of the form field (<Input Name="..." Type="File,...">)

'.ContentDisposition = Content-Disposition of the form field

'.FileName = Source file name for <input type=file>

'.ContentType = Content-Type for <input type=file>

'.Value = Binary value of the source field.

'.Length = Len of the binary data field

Function GetUpload()

Dim Result

Set Result = Nothing

If Request.ServerVariables("REQUEST_METHOD") = "POST" Then 'Request method must be "POST"

Dim CT, PosB, Boundary, Length, PosE

CT = Request.ServerVariables("HTTP_Content_Type") 'reads Content-Type header

If LCase(Left(CT, 19)) = "multipart/form-data" Then 'Content-Type header must be "multipart/form-data"

'This is upload request.

'Get the boundary and length from Content-Type header

PosB = InStr(LCase(CT), "boundary=") 'Finds boundary

If PosB > 0 Then Boundary = Mid(CT, PosB + 9) 'Separetes boundary

Length = CLng(Request.ServerVariables("HTTP_Content_Length")) 'Get Content-Length header

if "" & UploadSizeLimit<>"" then

UploadSizeLimit = clng(UploadSizeLimit)

if Length > UploadSizeLimit then

' on error resume next 'Clears the input buffer

' response.AddHeader "Connection", "Close"

' on error goto 0

Request.BinaryRead(Length)

Err.Raise 2, "GetUpload", "Upload size " & FormatNumber(Length,0) & "B exceeds limit of " & FormatNumber(UploadSizeLimit,0) & "B"

exit function

end if

If Length > 0 And Boundary <> "" Then 'Are there required informations about upload ?

Boundary = "--" & Boundary

Dim Head, Binary

Binary = Request.BinaryRead(Length) 'Reads binary data from client

'Retrieves the upload fields from binary data

Set Result = SeparateFields(Binary, Boundary)

Binary = Empty 'Clear variables

Else

Err.Raise 10, "GetUpload", "Zero length request ."

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End If

Else

Err.Raise 11, "GetUpload", "No file sent."

End If

Else

Err.Raise 1, "GetUpload", "Bad request method."

End If

Set GetUpload = Result

End Function

'********************************** SeparateFields **********************************

'This function retrieves the upload fields from binary data and retuns the fields as array

'Binary is safearray of all raw binary data from input.

Function SeparateFields(Binary, Boundary)

Dim PosOpenBoundary, PosCloseBoundary, PosEndOfHeader, isLastBoundary

Dim Fields

Boundary = StringToBinary(Boundary)

PosOpenBoundary = InstrB(Binary, Boundary)

PosCloseBoundary = InstrB(PosOpenBoundary + LenB(Boundary), Binary, Boundary, 0)

Set Fields = CreateObject("Scripting.Dictionary")

Do While (PosOpenBoundary > 0 And PosCloseBoundary > 0 And Not isLastBoundary)

'Header and file/source field data

Dim HeaderContent, FieldContent

'Header fields

Dim Content_Disposition, FormFieldName, SourceFileName, Content_Type

'Helping variables

Dim Field, TwoCharsAfterEndBoundary

'Get end of header

PosEndOfHeader = InstrB(PosOpenBoundary + Len(Boundary), Binary, StringToBinary(vbCrLf + vbCrLf))

'Separates field header

HeaderContent = MidB(Binary, PosOpenBoundary + LenB(Boundary) + 2, PosEndOfHeader - PosOpenBoundary - LenB(Boundary) - 2)

'Separates field content

FieldContent = MidB(Binary, (PosEndOfHeader + 4), PosCloseBoundary - (PosEndOfHeader + 4) - 2)

'Separates header fields from header

GetHeadFields BinaryToString(HeaderContent), Content_Disposition, FormFieldName, SourceFileName, Content_Type

'Create one field and assign parameters

Set Field = CreateUploadField()

Field.Name = FormFieldName

Field.ContentDisposition = Content_Disposition

Field.FilePath = SourceFileName

Field.FileName = GetFileName(SourceFileName)

Field.ContentType = Content_Type

Field.Value = FieldContent

Field.Length = LenB(FieldContent)

Fields.Add FormFieldName, Field

'Is this ending boundary ?

TwoCharsAfterEndBoundary = BinaryToString(MidB(Binary, PosCloseBoundary + LenB(Boundary), 2))

'Binary.Mid(PosCloseBoundary + Len(Boundary), 2).String

isLastBoundary = TwoCharsAfterEndBoundary = "--"

If Not isLastBoundary Then 'This is not ending boundary - go to next form field.

PosOpenBoundary = PosCloseBoundary

PosCloseBoundary = InStrB(PosOpenBoundary + LenB(Boundary), Binary, Boundary )

End If

Loop

Set SeparateFields = Fields

End Function

'********************************** Utilities **********************************

Function BinaryToString(Binary)

Dim I, S

For I=1 to LenB(Binary)

S = S & Chr(AscB(MidB(Binary,I,1)))

BinaryToString = S

End Function

Function StringToBinary(String)

Dim I, B

For I=1 to len(String)

B = B & ChrB(Asc(Mid(String,I,1)))

StringToBinary = B

End Function

'Separates header fields from upload header

Function GetHeadFields(ByVal Head, Content_Disposition, Name, FileName, Content_Type)

Content_Disposition = LTrim(SeparateField(Head, "content-disposition:", ";"))

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Name = (SeparateField(Head, "name=", ";")) 'ltrim

If Left(Name, 1) = """" Then Name = Mid(Name, 2, Len(Name) - 2)

FileName = (SeparateField(Head, "filename=", ";")) 'ltrim

If Left(FileName, 1) = """" Then FileName = Mid(FileName, 2, Len(FileName) - 2)

Content_Type = LTrim(SeparateField(Head, "content-type:", ";"))

End Function

'Separets one filed between sStart and sEnd

Function SeparateField(From, ByVal sStart, ByVal sEnd)

Dim PosB, PosE, sFrom

sFrom = LCase(From)

PosB = InStr(sFrom, sStart)

If PosB > 0 Then

PosB = PosB + Len(sStart)

PosE = InStr(PosB, sFrom, sEnd)

If PosE = 0 Then PosE = InStr(PosB, sFrom, vbCrLf)

If PosE = 0 Then PosE = Len(sFrom) + 1

SeparateField = Mid(From, PosB, PosE - PosB)

Else

SeparateField = Empty

End If

End Function

'Separetes file name from the full path of file

Function GetFileName(FullPath)

Dim Pos, PosF

PosF = 0

For Pos = Len(FullPath) To 1 Step -1

Select Case Mid(FullPath, Pos, 1)

Case "/", "\": PosF = Pos + 1: Pos = 0

End Select

If PosF = 0 Then PosF = 1

GetFileName = Mid(FullPath, PosF)

End Function

</SCRIPT>

//The function creates Field object.

function CreateUploadField(){ return new uf_Init() }

function uf_Init(){

this.Name = null

this.ContentDisposition = null

this.FileName = null

this.FilePath = null

this.ContentType = null

this.Value = null

this.Length = null

}

</SCRIPT>


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