| /***************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * $Id$ |
| * |
| * An example source code that issues a HTTP POST and we provide the actual |
| * data through a read callback. |
| * |
| */ |
| #include <stdio.h> |
| #include <string.h> |
| #include <curl/curl.h> |
| |
| const char data[]="this is what we post to the silly web server"; |
| |
| struct WriteThis { |
| const char *readptr; |
| int sizeleft; |
| }; |
| |
| static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp) |
| { |
| struct WriteThis *pooh = (struct WriteThis *)userp; |
| |
| if(size*nmemb < 1) |
| return 0; |
| |
| if(pooh->sizeleft) { |
| *(char *)ptr = pooh->readptr[0]; /* copy one single byte */ |
| pooh->readptr++; /* advance pointer */ |
| pooh->sizeleft--; /* less data left */ |
| return 1; /* we return 1 byte at a time! */ |
| } |
| |
| return 0; /* no more data left to deliver */ |
| } |
| |
| int main(void) |
| { |
| CURL *curl; |
| CURLcode res; |
| |
| struct WriteThis pooh; |
| |
| pooh.readptr = data; |
| pooh.sizeleft = strlen(data); |
| |
| curl = curl_easy_init(); |
| if(curl) { |
| /* First set the URL that is about to receive our POST. */ |
| curl_easy_setopt(curl, CURLOPT_URL, |
| "http://receivingsite.com.pooh/index.cgi"); |
| /* Now specify we want to POST data */ |
| curl_easy_setopt(curl, CURLOPT_POST, 1L); |
| |
| /* we want to use our own read function */ |
| curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback); |
| |
| /* pointer to pass to our read function */ |
| curl_easy_setopt(curl, CURLOPT_READDATA, &pooh); |
| |
| /* get verbose debug output please */ |
| curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); |
| |
| /* |
| If you use POST to a HTTP 1.1 server, you can send data without knowing |
| the size before starting the POST if you use chunked encoding. You |
| enable this by adding a header like "Transfer-Encoding: chunked" with |
| CURLOPT_HTTPHEADER. With HTTP 1.0 or without chunked transfer, you must |
| specify the size in the request. |
| */ |
| #ifdef USE_CHUNKED |
| { |
| struct curl_slist *chunk = NULL; |
| |
| chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked"); |
| res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk); |
| /* use curl_slist_free_all() after the *perform() call to free this |
| list again */ |
| } |
| #else |
| /* Set the expected POST size. If you want to POST large amounts of data, |
| consider CURLOPT_POSTFIELDSIZE_LARGE */ |
| curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (curl_off_t)pooh.sizeleft); |
| #endif |
| |
| #ifdef DISABLE_EXPECT |
| /* |
| Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" |
| header. You can disable this header with CURLOPT_HTTPHEADER as usual. |
| NOTE: if you want chunked transfer too, you need to combine these two |
| since you can only set one list of headers with CURLOPT_HTTPHEADER. */ |
| |
| /* A less good option would be to enforce HTTP 1.0, but that might also |
| have other implications. */ |
| { |
| struct curl_slist *chunk = NULL; |
| |
| chunk = curl_slist_append(chunk, "Expect:"); |
| res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk); |
| /* use curl_slist_free_all() after the *perform() call to free this |
| list again */ |
| } |
| #endif |
| |
| /* Perform the request, res will get the return code */ |
| res = curl_easy_perform(curl); |
| |
| /* always cleanup */ |
| curl_easy_cleanup(curl); |
| } |
| return 0; |
| } |