Posted by Dag Sunde on 11/14/06 17:08

Steve Gerrard wrote:
> "Dag Sunde" <me@dagsunde.com> wrote in message
> news:4559e5e9$0$16511$8404b019@news.wineasy.se...
>>
>> From vb, use the XmlHttp object or one of its siblings to POST
>> the data to this php-script on the server.
>>
>> To view the high-scores, use the same principle. (Do it from php, and
>> when your vb client needs it, Use HTTP).
>>
>
> Dag, how much data is reasonable to move back and forth using the
> XmlHttp object in VB6? Is it pretty much limited to a few parameters
> like name, rank, and serial number, or can you move a list of stuff?
> It sounds just right for OP's needs, but I'm curious about other
> situations. I suppose I could try moving more data with a series of
> calls or something?

If you use the "GET", it is limited to the max-length of the URL...

In Internet Explorer, this is 2,083 bytes, so I guess it is something
similar in the XMLHttp-object too.

If you use "POST" on the other hand, it is up to the server.
In IIS, the maximum number of bytes for one form variable is
approx. 102,399 bytes. To overcome this, you just send
several fields (variables) with the same name. IIS (ASP)
will then see them as an array you can loop thru.

I frequently send (POST) 500K via the xmlhttp object to an
ASP script running on IIS 5.0...

So if my POST'ed data look like this:
//PseudoJavascript
sData = "xmlData=" + escape("102399BytesOfData")
sData = sData + "&xmlData=" + escape("another102399BytesOfData")

xmlReq.open("POST", "Receiver.asp", true);
xmlReq.onreadystatechange = xmlSendBidCallback;
xmlReq.setRequestHeader( "Content-Type",
"application/x-www-form-urlencoded");
xmlReq.send( sData );

My Receiver.asp will assemble it like this:

//VBS fragment..
Dim xmlData
Dim i
for i = 1 to Request.Form("XmlData").Count
xmlData = xmlData & Request.Form("XmlData")(i)
next

--
Dag.

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