Question

HTTP Post & WebClient

Asked by: malramsay

Hi,

I need to create an app that checks a directory, determines if there are any text files and if there are, posts them to another server in a similar way to the HTML page below.  It must include the "encType="multipart/form-data"" part.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=windows-1252">
<META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD>
<BODY>
<FORM action="https://asp.mydomain.com/myfolder/index.cgi" method="post" encType="multipart/form-data">
<INPUT type="file" name="linkfile"> <INPUT type="submit" value="Submit Query" name="Send File">
<INPUT type="hidden" value="MyLink" name="E">
</FORM>
</BODY>
</HTML>

I've tried using the HTTP Post method below, but it doesn't seem to work.  Is this the right way to do it or is there some other way?  Should I be using a VB.NET application anyway?  How does "encType="multipart/form-data"" work in .NET? Is there a better way to do it?  The computer doesn't have IIS etc on it, so I'm not sure if a ASP.Net app is viable....?

 Dim strAddress As String = "https://asp.mydomain.com/myfolder/index.cgi"    
 Dim strFile as string = "C:/MyDir/test.txt"  
 Dim myWebClient As New WebClient
 Dim arrResponse As Byte() = myWebClient.UploadFile(strAddress, "POST", strFile)
 Dim strResponse As String = Encoding.ASCII.GetString(arrResponse)

Regards,
Malcolm

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Asked On
2004-05-10 at 18:34:54ID20984747
Tags

multipart

Topic

Microsoft Visual Basic.Net

Participating Experts
1
Points
500
Comments
9

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Answers

 

by: gregoryyoungPosted on 2004-05-10 at 18:51:43ID: 11036450

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemnetwebclientclassuploadfiletopic.asp

I am using this currently without issue.

As for whether or not you should be ...

I will start with my presumptions.

1) You are uploading this info to a different server.

2) This should occur always (new file = upload)

It sounds to me like this should be a windows service ( http://www.developerfusion.com/show/3441/ ) which has a file watcher in it that queues files for upload by another thread. I am not sure what problem you may be having with post but you could also use HTTP put to do this (webclient also supports).

Sorry if I can not be of complete assistance,

Greg

 

by: malramsayPosted on 2004-05-10 at 18:56:38ID: 11036465

Hi Greg,

I am loading the file onto a different server and the server receives the file correctly when using the HTML code above.

The file upload should occur whenever there is a new file in the directory.

I've also tried HTTP Put but this didn't work either.  I think there is an issue with the "encType="multipart/form-data"" part but I'm not sure.

Malcolm

 

by: gregoryyoungPosted on 2004-05-10 at 19:10:35ID: 11036516

it most likely fails on the put because PUT is not allowed.

http://www.developerfusion.com/show/3636/2/ heres a tutorial on creating a filewatcher service.

this will guide you through writing a file watching service.

What is the enctype being received by the server when you do it through code ?

 

by: malramsayPosted on 2004-05-10 at 19:27:49ID: 11036624


Thanks for that link Greg.  Now if I can just get the Post to work I'd be sorted!

I'm not exactly sure what you meant by "What is the enctype being received by the server when you do it through code ?", but when I use WebClient in my code above I get the same response message (strResponse) as I do if I got straight to the address in IE without posting anything.  Thus, it appears the recipient server page is not receiving anything.

Any ideas?

 

by: gregoryyoungPosted on 2004-05-10 at 19:32:39ID: 11036656

what is the server receiving for enctype ? also is it possible to see code for this? I have code such as this working at present.

 

by: malramsayPosted on 2004-05-10 at 20:15:50ID: 11036912


Oh that's what you meant.  Unfortunately I can't view that code at present, as it's hosted by another company and they use server side scripting.  I may endeavour to find out if there is no other way forward.

 

by: gregoryyoungPosted on 2004-05-13 at 14:56:52ID: 11063783

are you posting it to the .aspx file ? or trying to post to a directory ? you can only post to a file (not the directory)

20120131-EE-VQP-002

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