Re: [libmicrohttpd] MHD_OPTION_URI_LOG_CALLBACK function is passed empty URI string:

[Christian Grothoff]

On 05/28/2014 03:20 AM, Nader Zeid wrote:
> I can't think of any reason why this won't work. I have the following
> function:
> 
> 
> 
> void * MicroHttpdServer::log(void * cls, const char * uri) {
>   Request *request(new Request());
>   printf("\nURI: %s\n", uri);
>   return request;
> }
> 
> 
> 
> Given as the value of the MHD_OPTION_URI_LOG_CALLBACK option:
> 
> 
> 
> MHD_Daemon *daemon;
> daemon = MHD_start_daemon(
>   MHD_USE_SELECT_INTERNALLY | MHD_USE_IPv6,
>   MicroHttpdServer::port,
>   NULL, // &MicroHttpdServer::authorize
>   NULL,
>   &MicroHttpdServer::handle,
>   NULL,
>   MHD_OPTION_THREAD_POOL_SIZE,
>   MicroHttpdServer::amount,
>   MHD_OPTION_URI_LOG_CALLBACK,
>   &MicroHttpdServer::log,
>   MHD_OPTION_END
> );

A first bug here is that you need to add an extra 'NULL' argument
after &MicroHttpdServer::log for the 'cls'.  Right now, the behavior
is undefined.

Next, you might need to avoid the C++-ism of "MicroHttpdServer::log"
as there is no "self" pointer passed from C, which might effectively
shift your arguments by one.  So try with a plain old C function ;-)

Happy hacking!

Christian