On Fri, 27 Sep 2013, Ulf Samuelsson wrote:

> Want to create a query with multiple fields, and get the result in a C++
> string
>
> Example: "http://www.myserver.com?field=1&field=2&field=3"
>
> The server need the query to be of the form
> "application/x-www-form-urlencoded".

Here's a very simple example showing how to send the POST:

   http://curl.haxx.se/libcurl/c/simplepost.html

... and you can combine that with the example showing how to receive the
response back into a memory buffer:

   http://curl.haxx.se/libcurl/c/getinmemory.html

-- 
  / daniel.haxx.se
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