Upload Files to Web Server

Demonstrates how to upload files from an application to a web server. Note: There must be something provided on the server-side to consume the upload. It could be an ASP or ASP.NET script, Perl, C++ CGI, PHP, Ruby, etc,. However, uploading via HTTP is not the same as uploading via FTP where the FTP server handles receiving the file and saving to disk.

The C# code behind http://www.chilkatsoft.com/receiveUpload.aspx may be found at this URL: C# to Receive Upload in ASP.NET.

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Dim success As Boolean
Dim http As New Chilkat.Http()

'  Any string unlocks the component for the 1st 30-days.
success = http.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    MsgBox(http.LastErrorText)
    Exit Sub
End If


'  Build a HTTP request with the files to be uploaded:
Dim req As New Chilkat.HttpRequest()
req.UseUpload()

'  The URL we'll be posting to is:
'  http://www.chilkatsoft.com/receiveUpload.aspx
'  Therefore, the path part of the URL is:
req.Path = "/receiveUpload.aspx"

'  Note: You may test uploads to this URL, but anything over 80K will be aborted on the receiving side.

'  Add some files to the request:
'  The 1st argument is an arbitrary name.  It's the POST form field name.
'  The 2nd argument is the filename currently existing on
'  the local filesystem.  It may include an absolute or relative
'  path, or no path at all if it's in the current working directory.
success = req.AddFileForUpload("file1","hamlet.xml")
If (success <> true) Then
    MsgBox(req.LastErrorText)
    Exit Sub
End If

success = req.AddFileForUpload("file2","dude.gif")
If (success <> true) Then
    MsgBox(req.LastErrorText)
    Exit Sub
End If


'  Send the HTTP POST and get the response.  Note: This is a blocking call.
'  The method does not return until the full HTTP response is received.
Dim domain As String
Dim port As Long
Dim ssl As Boolean
domain = "www.chilkatsoft.com"
port = 80
ssl = false
Dim resp As Chilkat.HttpResponse
resp = http.SynchronousRequest(domain,port,ssl,req)
If (resp Is Nothing ) Then
    TextBox1.Text = TextBox1.Text & http.LastErrorText & vbCrLf
Else
    '  Display the HTML source of the page returned.
    TextBox1.Text = TextBox1.Text & resp.BodyStr & vbCrLf
End If