File Upload using a VBScript Class

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Introduction

There are several components on the market that allow your ASP application to handle file uploads. But when you are in a situation where in you are not allowed to install any components then this vbsUpload will be helpful to you. During my Academic Project I was not allowd to use the components on the server and hence found an alternative to Upload the Files from the client end.

Code Support

vbsUpload.asp

This is the file which contains the whole logic of the File Upload. The Request.Binary read method is used to read the raw data sent by the client as part of a POST request. ASP provides a method to apply URL encoding rules, but no publicly exposed way to decode. The URLDecode method does that URLDecoding. Then the raw data is parsed and the File elements and Form Elements are separately kept in two collection objects.

Process_File.asp

This is a simple asp file used to Upload the multipart/form-data. Once the data is available this file will save the file on the hard disk. The file is as follows:

<%@ Language="VBScript" %>
<!-- #include file="vbsUpload.asp" -->
<form method=post
      enctype="multipart/form-data"
      action=<%=request.servervariables("script_name")%>>
Your File:<BR><input type=file name=YourFile><BR><BR>
<input type=submit name=submit value="Upload">
</form>
<%
Dim objUpload, lngLoop

If Request.TotalBytes > 0 Then
	Set objUpload = New vbsUpload

  For lngLoop = 0 to objUpload.Files.Count - 1
    'If accessing this page annonymously,
    'the internet guest account must have
    'write permission to the path below.
    objUpload.Files.Item(lngLoop).Save "c:\Newupload\"

	Response.Write "File Uploaded"
	Next

End if
%>

Process_DB.asp

This is another simple file to get multipart/form-data but this will save the data in the Database

conn.asp

This is for using SQLServer to store the files. I have provided the Script to create the Table. So you can create the same table format and use it. Don't forget to fill in the correct Connection String.

Download.asp

This file is used to retreive the binay data from the Database and to display on the Web.

Note: The binary data is written into a file using "Scripting.FileSystemObject" CreateTextFile method. This is not working properly in the case of Excel and other binary files. So limit your usuage only with plain text file. When the file is uploaded to database, the content type is noted and the binary content is saved as Image data type in the SQL Server. Using download.asp the binary data is written back to the client with the proper content type. So there is no problem with the Database File Upload&download. You can upload all the file types (Excel,jpg etc..) using Process_DB.asp.

Conclusion

Now it is easy for me to handle file uploads using ASP and VBScript. I was using this on Windows 2000 Server and Internet Explorer 5. There may be bugs on other versions of the server or client. Please treat this code as a demo version only. It is not meant for production use unless other wise you make it that way.