Annotation of embedaddon/curl/docs/examples/postinmemory.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, 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 https://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: /* <DESC>
23: * Make a HTTP POST with data from memory and receive response in memory.
24: * </DESC>
25: */
26: #include <stdio.h>
27: #include <stdlib.h>
28: #include <string.h>
29: #include <curl/curl.h>
30:
31: struct MemoryStruct {
32: char *memory;
33: size_t size;
34: };
35:
36: static size_t
37: WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
38: {
39: size_t realsize = size * nmemb;
40: struct MemoryStruct *mem = (struct MemoryStruct *)userp;
41:
42: char *ptr = realloc(mem->memory, mem->size + realsize + 1);
43: if(!ptr) {
44: /* out of memory! */
45: printf("not enough memory (realloc returned NULL)\n");
46: return 0;
47: }
48:
49: mem->memory = ptr;
50: memcpy(&(mem->memory[mem->size]), contents, realsize);
51: mem->size += realsize;
52: mem->memory[mem->size] = 0;
53:
54: return realsize;
55: }
56:
57: int main(void)
58: {
59: CURL *curl;
60: CURLcode res;
61: struct MemoryStruct chunk;
62: static const char *postthis = "Field=1&Field=2&Field=3";
63:
64: chunk.memory = malloc(1); /* will be grown as needed by realloc above */
65: chunk.size = 0; /* no data at this point */
66:
67: curl_global_init(CURL_GLOBAL_ALL);
68: curl = curl_easy_init();
69: if(curl) {
70: curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.org/");
71:
72: /* send all data to this function */
73: curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
74:
75: /* we pass our 'chunk' struct to the callback function */
76: curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
77:
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");
81:
82: curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postthis);
83:
84: /* if we don't provide POSTFIELDSIZE, libcurl will strlen() by
85: itself */
86: curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postthis));
87:
88: /* Perform the request, res will get the return code */
89: res = curl_easy_perform(curl);
90: /* Check for errors */
91: if(res != CURLE_OK) {
92: fprintf(stderr, "curl_easy_perform() failed: %s\n",
93: curl_easy_strerror(res));
94: }
95: else {
96: /*
97: * Now, our chunk.memory points to a memory block that is chunk.size
98: * bytes big and contains the remote file.
99: *
100: * Do something nice with it!
101: */
102: printf("%s\n",chunk.memory);
103: }
104:
105: /* always cleanup */
106: curl_easy_cleanup(curl);
107: }
108:
109: free(chunk.memory);
110: curl_global_cleanup();
111: return 0;
112: }
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