The upload form
Now that we have created the VB ActiveX DLL component, we can code the uploadcomplete.asp
file. Add the following code to uploadcomplete.asp, and we'll take
a look at what exactly is going on.
<%
Option Explicit
Dim objUpload, strUploadPath, strMsg, strFileExtensions
'create the ActiveX object
Set objUpload = Server.CreateObject("ASPUploadComponent.cUpload")
'set the upload path
'***You will need to change this!***
strUploadPath = "C:\inetpub\wwwroot\uploaddemo\files\"
'set the file extensions to exclude
strFileExtensions = ".exe;.dll"
If objUpload.FieldExists("thefile") = False Then
Response.Write "Invalid Post Data"
Response.End
Else
'file posted...
'attempt to save the file
On Error Resume Next
objUpload.Form("thefile").SaveFile strUploadPath,
objUpload.Form("thefile").Value, strFileExtensions
If Err Then
'an error occured... ie file
already exists, invalid extension etc
strMsg = "Error "
& Err.Number & ": " & Err.Description
Else
'add description to the database?
'cConn.Execute ("INSERT
INTO mydocs (FileName,Description) VALUES ('" & objUpload.Form("thefile").Value
& "','" & objUpload.Form("description").Value)
strMsg = "The file was
successfully uploaded."
End If
End If
%>
<html>
<head>
<title>VB Web ASP File Upload Complete</title>
</head>
<body>
<p><%=strMsg%></p>
<p><b>File Name:</b> <%=objUpload.Form("thefile").Value%><br>
<b>File Size:</b> <%=objUpload.Form("thefile").FileSize%><br>
<b>Content Type:</b> <%=objUpload.Form("thefile").ContentType%><br>
<b>Description:</b> <%=objUpload.Form("description").Value%></p>
</body>
</html>
So, lets have a quick look at how this code works. First, we create an instance
of the ActiveX DLL using
Set objUpload = Server.CreateObject("ASPUploadComponent.cUpload")
(as we can't add a reference to the DLL like we would in Visual Basic). The
next two lines set the path on the server where the file is going to be uploaded,
and we set strFileExtensions, specifying the file extensions to
exclude. (This is always a good idea, as you don't want your users uploading
executables to your server!).
Next, we check to see if the field, 'thefile', exists, using the
FieldExists property exposed by the objUpload object:
If objUpload.FieldExists("thefile") = False Then
If it doesn't, we know the form has not been posted correctly, or the user
has not selected a file. If it does exist, we try to save the file:
objUpload.Form("thefile").SaveFile strUploadPath, objUpload.Form("thefile").Value,
strFileExtensions
The SaveFile method uses the following parameters:
SaveFile UploadFolder, FileName, [ExcludeFileExtensions],
[MaxByteCount]
If an error occurs, we trap the error, and otherwise, tell the user the file
has been uploaded. At this stage, we could also add the description field to
a database, for example. The rest of the page outputs the HTML, and displays
the information exposed about the file that was uploaded...