1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
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 http://curl.haxx.se/docs/copyright.html.
13 *
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.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <curl/curl.h>
26
27 struct MemoryStruct {
28 char *memory;
29 size_t size;
30 };
31
32 static size_t
WriteMemoryCallback(void * contents,size_t size,size_t nmemb,void * userp)33 WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
34 {
35 size_t realsize = size * nmemb;
36 struct MemoryStruct *mem = (struct MemoryStruct *)userp;
37
38 mem->memory = realloc(mem->memory, mem->size + realsize + 1);
39 if(mem->memory == NULL) {
40 /* out of memory! */
41 printf("not enough memory (realloc returned NULL)\n");
42 return 0;
43 }
44
45 memcpy(&(mem->memory[mem->size]), contents, realsize);
46 mem->size += realsize;
47 mem->memory[mem->size] = 0;
48
49 return realsize;
50 }
51
main(void)52 int main(void)
53 {
54 CURL *curl;
55 CURLcode res;
56 struct MemoryStruct chunk;
57 static const char *postthis="Field=1&Field=2&Field=3";
58
59 chunk.memory = malloc(1); /* will be grown as needed by realloc above */
60 chunk.size = 0; /* no data at this point */
61
62 curl_global_init(CURL_GLOBAL_ALL);
63 curl = curl_easy_init();
64 if(curl) {
65
66 curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.org/");
67
68 /* send all data to this function */
69 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
70
71 /* we pass our 'chunk' struct to the callback function */
72 curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
73
74 /* some servers don't like requests that are made without a user-agent
75 field, so we provide one */
76 curl_easy_setopt(curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");
77
78 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postthis);
79
80 /* if we don't provide POSTFIELDSIZE, libcurl will strlen() by
81 itself */
82 curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postthis));
83
84 /* Perform the request, res will get the return code */
85 res = curl_easy_perform(curl);
86 /* Check for errors */
87 if(res != CURLE_OK) {
88 fprintf(stderr, "curl_easy_perform() failed: %s\n",
89 curl_easy_strerror(res));
90 }
91 else {
92 /*
93 * Now, our chunk.memory points to a memory block that is chunk.size
94 * bytes big and contains the remote file.
95 *
96 * Do something nice with it!
97 */
98 printf("%s\n",chunk.memory);
99 }
100
101 /* always cleanup */
102 curl_easy_cleanup(curl);
103
104 free(chunk.memory);
105
106 /* we're done with libcurl, so clean it up */
107 curl_global_cleanup();
108 }
109 return 0;
110 }
111