Annotation of embedaddon/curl/docs/examples/getinmemory.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2018, 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: * Shows how the write callback function can be used to download data into a
24: * chunk of memory instead of storing it in a file.
25: * </DESC>
26: */
27:
28: #include <stdio.h>
29: #include <stdlib.h>
30: #include <string.h>
31:
32: #include <curl/curl.h>
33:
34: struct MemoryStruct {
35: char *memory;
36: size_t size;
37: };
38:
39: static size_t
40: WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
41: {
42: size_t realsize = size * nmemb;
43: struct MemoryStruct *mem = (struct MemoryStruct *)userp;
44:
45: char *ptr = realloc(mem->memory, mem->size + realsize + 1);
46: if(ptr == NULL) {
47: /* out of memory! */
48: printf("not enough memory (realloc returned NULL)\n");
49: return 0;
50: }
51:
52: mem->memory = ptr;
53: memcpy(&(mem->memory[mem->size]), contents, realsize);
54: mem->size += realsize;
55: mem->memory[mem->size] = 0;
56:
57: return realsize;
58: }
59:
60: int main(void)
61: {
62: CURL *curl_handle;
63: CURLcode res;
64:
65: struct MemoryStruct chunk;
66:
67: chunk.memory = malloc(1); /* will be grown as needed by the realloc above */
68: chunk.size = 0; /* no data at this point */
69:
70: curl_global_init(CURL_GLOBAL_ALL);
71:
72: /* init the curl session */
73: curl_handle = curl_easy_init();
74:
75: /* specify URL to get */
76: curl_easy_setopt(curl_handle, CURLOPT_URL, "https://www.example.com/");
77:
78: /* send all data to this function */
79: curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
80:
81: /* we pass our 'chunk' struct to the callback function */
82: curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
83:
84: /* some servers don't like requests that are made without a user-agent
85: field, so we provide one */
86: curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
87:
88: /* get it! */
89: res = curl_easy_perform(curl_handle);
90:
91: /* check for errors */
92: if(res != CURLE_OK) {
93: fprintf(stderr, "curl_easy_perform() failed: %s\n",
94: curl_easy_strerror(res));
95: }
96: else {
97: /*
98: * Now, our chunk.memory points to a memory block that is chunk.size
99: * bytes big and contains the remote file.
100: *
101: * Do something nice with it!
102: */
103:
104: printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
105: }
106:
107: /* cleanup curl stuff */
108: curl_easy_cleanup(curl_handle);
109:
110: free(chunk.memory);
111:
112: /* we're done with libcurl, so clean it up */
113: curl_global_cleanup();
114:
115: return 0;
116: }
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