1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 * Make a HTTP POST with data from memory and receive response in memory.
29 #include <curl/curl.h>
37 WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
39 size_t realsize = size * nmemb;
40 struct MemoryStruct *mem = (struct MemoryStruct *)userp;
42 mem->memory = realloc(mem->memory, mem->size + realsize + 1);
43 if(mem->memory == NULL) {
45 printf("not enough memory (realloc returned NULL)\n");
49 memcpy(&(mem->memory[mem->size]), contents, realsize);
50 mem->size += realsize;
51 mem->memory[mem->size] = 0;
60 struct MemoryStruct chunk;
61 static const char *postthis = "Field=1&Field=2&Field=3";
63 chunk.memory = malloc(1); /* will be grown as needed by realloc above */
64 chunk.size = 0; /* no data at this point */
66 curl_global_init(CURL_GLOBAL_ALL);
67 curl = curl_easy_init();
70 curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.org/");
72 /* send all data to this function */
73 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
75 /* we pass our 'chunk' struct to the callback function */
76 curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
78 /* some servers don't like requests that are made without a user-agent
79 field, so we provide one */
80 curl_easy_setopt(curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");
82 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postthis);
84 /* if we don't provide POSTFIELDSIZE, libcurl will strlen() by
86 curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postthis));
88 /* Perform the request, res will get the return code */
89 res = curl_easy_perform(curl);
90 /* Check for errors */
92 fprintf(stderr, "curl_easy_perform() failed: %s\n",
93 curl_easy_strerror(res));
97 * Now, our chunk.memory points to a memory block that is chunk.size
98 * bytes big and contains the remote file.
100 * Do something nice with it!
102 printf("%s\n",chunk.memory);
106 curl_easy_cleanup(curl);
110 /* we're done with libcurl, so clean it up */
111 curl_global_cleanup();