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/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* 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; long 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 = (long)strlen(data); /* In windows, this will init the winsock stuff */ res = curl_global_init(CURL_GLOBAL_DEFAULT); /* Check for errors */ if(res != CURLE_OK) { fprintf(stderr, "curl_global_init() failed: %s\n", curl_easy_strerror(res)); return 1; } /* get a curl handle */ curl = curl_easy_init(); if(curl) { /* First set the URL that is about to receive our POST. */ curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/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, 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); /* Check for errors */ if(res != CURLE_OK) fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res)); /* always cleanup */ curl_easy_cleanup(curl); } curl_global_cleanup(); return 0; }