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