Awesome! Thank you
On Saturday, 11 August 2012, Nir Soffer <nir...@gmail.com> wrote:
>
> On Aug 11, 2012, at 6:30 PM, Riccardo Tacconi wrote:
>
>> Hi,
>>
>> I have the following code called from libevent's http-server.c demo:
>>
>> #include "servlet.h"
>>
>> void servlet(struct evhttp_request *req, struct evbuffer *evb) {
>> size_t len =
evbuffer_get_length(evhttp_request_get_input_buffer(req));
>> struct evbuffer *in_evb = evhttp_request_get_input_buffer(req);
>> char *data = malloc(len);
>> evbuffer_copyout(in_evb, data, len);
>> evhttp_parse_query_str(data, evhttp_request_get_input_headers(req));
>>
>> time_t now;
>> time(&now);
>>
>> evbuffer_add_printf(evb, "<html>\n <head>\n"
>> " <title>%s</title>\n"
>> " </head>\n"
>> " <body>\n"
>> " <h1>%s</h1>\n"
>> " <p>Current time is: %s</p>"
>> " <p>received data size: %d</p>\n"
>> " <p>received data: %s</p></body></html>",
>> "C servlet title",
>> "C servlet",
>> ctime(&now),
>> (int)len,
>> data);
>> evhttp_add_header(evhttp_request_get_output_headers(req),
>> "Content-Type", "text/html");
>> evhttp_send_reply(req, 200, "OK", evb);
>> free(data);
>> }
>>
>> in data I have this string "param1=value1¶m2=value2". I would like
to use the in-build parser and I added:
>>
>> evhttp_parse_query_str(data, evhttp_request_get_input_headers(req));
>>
>> but I am not sure how I can access the parsed key/values and if I am
using the right function.
>
> You can url encoded data from the input buffer like this:
>
> // Include the keyvalq_struct header, for creating evkeyvalq struct and
accessing keys and values
> #include <event2/keyvalq_struct.h>
>
> // Create a evkeyvalq to keep parsed parameters
> struct evkeyvalq params;
>
> // Ensure that data is null terminated - evhttp_parse_query_str() expects
a null terminated string, but the input buffer may contain non-terminated
data.
> char *data = malloc(len + 1);
> evbuffer_copyout(in_evb, data, len);
> data[len] = '\0';
>
> // Parse the query string
> evhttp_parse_query_str(data, ¶ms);
>
> // Now you can access the parameters using
> const char *value = evhttp_find_header(params, "name");
>
> // If you want to iterate over all values, you can do
> struct evkeyval *param;
>
> TAILQ_FOREACH(param, ¶ms, next) {
> // Do something with param->key and param->value
> }
>
> // Finally, you have to free the memory allocated for the parameters
> evhttp_clear_headers(¶ms);
>
>
>
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>
--
Riccardo Tacconi
Ruby on Rails and PHP development - System Administration
VIRTUELOGIC LIMITED
http://github.com/rtacconi
http://riccardotacconi.blogspot.com
http://twitter.com/rtacconi
