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11/15/2001 at 08:49AM PST, ID: 20233874
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5.4

Using MSXML to transmit files through SSL

Asked by MELeBlanc in Visual Basic Programming

Tags: msxml


A couple of weeks ago I wrote a quick VB application that uses the MSXML component to pull a data file from a vendor's website through SSL on a site that is set for challenge/response.  Once it was completed and tested, the "powers that be" of course came to me and said... "That's great!  Now we need you to make it push a file to a web server in the same fashion."

After a few problems here and there, I finally came up with a solution that works.  What I am doing is using a VB program using the MSXML component to send the data file to the target web server.  On the web server is a small ASP page that captures the data being sent (through request.binaryread) and then writes it out to a file.  Worked great for small files but just as soon as the file got over 100K there were timeout problems and even extending the script timeout still wasn't that efficient.  So.... what I ended up doing was have the VB component slice the file up into 10K chunks and send them across the wire to the catch script that then would put the pieces back together (error and data integrity checks are done as well).  Well it works, but to transmit a 13MB file it takes a little over 6 minutes to do it... and that's locally!  I don't even want to make a guess as to how long it would take to transmit through the Internet!!

Now... to my question... is there an easier/more efficient way to do this using these same components?  It is a requirement to use SSL for obvious security reasons, in addition to the fact that it will run through already opened ports on our corporate firewall.

I'm looking for actual code examples.... no theories please ;)

I'll start it off at 100 points, but if the examples are plug and play enough I will *gladly* increase the points!!

Thanks in advance.

-M
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About this solution

Zone: Visual Basic Programming
Tags: msxml
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Solution Provided By: aikimark
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Solution Grade: A
 
 
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