xref: /aosp_15_r20/external/curl/docs/examples/websocket-cb.c (revision 6236dae45794135f37c4eb022389c904c8b0090d)
1*6236dae4SAndroid Build Coastguard Worker /***************************************************************************
2*6236dae4SAndroid Build Coastguard Worker  *                                  _   _ ____  _
3*6236dae4SAndroid Build Coastguard Worker  *  Project                     ___| | | |  _ \| |
4*6236dae4SAndroid Build Coastguard Worker  *                             / __| | | | |_) | |
5*6236dae4SAndroid Build Coastguard Worker  *                            | (__| |_| |  _ <| |___
6*6236dae4SAndroid Build Coastguard Worker  *                             \___|\___/|_| \_\_____|
7*6236dae4SAndroid Build Coastguard Worker  *
8*6236dae4SAndroid Build Coastguard Worker  * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9*6236dae4SAndroid Build Coastguard Worker  *
10*6236dae4SAndroid Build Coastguard Worker  * This software is licensed as described in the file COPYING, which
11*6236dae4SAndroid Build Coastguard Worker  * you should have received as part of this distribution. The terms
12*6236dae4SAndroid Build Coastguard Worker  * are also available at https://curl.se/docs/copyright.html.
13*6236dae4SAndroid Build Coastguard Worker  *
14*6236dae4SAndroid Build Coastguard Worker  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15*6236dae4SAndroid Build Coastguard Worker  * copies of the Software, and permit persons to whom the Software is
16*6236dae4SAndroid Build Coastguard Worker  * furnished to do so, under the terms of the COPYING file.
17*6236dae4SAndroid Build Coastguard Worker  *
18*6236dae4SAndroid Build Coastguard Worker  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19*6236dae4SAndroid Build Coastguard Worker  * KIND, either express or implied.
20*6236dae4SAndroid Build Coastguard Worker  *
21*6236dae4SAndroid Build Coastguard Worker  * SPDX-License-Identifier: curl
22*6236dae4SAndroid Build Coastguard Worker  *
23*6236dae4SAndroid Build Coastguard Worker  ***************************************************************************/
24*6236dae4SAndroid Build Coastguard Worker /* <DESC>
25*6236dae4SAndroid Build Coastguard Worker  * WebSocket download-only using write callback
26*6236dae4SAndroid Build Coastguard Worker  * </DESC>
27*6236dae4SAndroid Build Coastguard Worker  */
28*6236dae4SAndroid Build Coastguard Worker #include <stdio.h>
29*6236dae4SAndroid Build Coastguard Worker #include <curl/curl.h>
30*6236dae4SAndroid Build Coastguard Worker 
writecb(char * b,size_t size,size_t nitems,void * p)31*6236dae4SAndroid Build Coastguard Worker static size_t writecb(char *b, size_t size, size_t nitems, void *p)
32*6236dae4SAndroid Build Coastguard Worker {
33*6236dae4SAndroid Build Coastguard Worker   CURL *easy = p;
34*6236dae4SAndroid Build Coastguard Worker   size_t i;
35*6236dae4SAndroid Build Coastguard Worker   const struct curl_ws_frame *frame = curl_ws_meta(easy);
36*6236dae4SAndroid Build Coastguard Worker   fprintf(stderr, "Type: %s\n", frame->flags & CURLWS_BINARY ?
37*6236dae4SAndroid Build Coastguard Worker           "binary" : "text");
38*6236dae4SAndroid Build Coastguard Worker   fprintf(stderr, "Bytes: %u", (unsigned int)(nitems * size));
39*6236dae4SAndroid Build Coastguard Worker   for(i = 0; i < nitems; i++)
40*6236dae4SAndroid Build Coastguard Worker     fprintf(stderr, "%02x ", (unsigned char)b[i]);
41*6236dae4SAndroid Build Coastguard Worker   return nitems;
42*6236dae4SAndroid Build Coastguard Worker }
43*6236dae4SAndroid Build Coastguard Worker 
main(void)44*6236dae4SAndroid Build Coastguard Worker int main(void)
45*6236dae4SAndroid Build Coastguard Worker {
46*6236dae4SAndroid Build Coastguard Worker   CURL *curl;
47*6236dae4SAndroid Build Coastguard Worker   CURLcode res;
48*6236dae4SAndroid Build Coastguard Worker 
49*6236dae4SAndroid Build Coastguard Worker   curl = curl_easy_init();
50*6236dae4SAndroid Build Coastguard Worker   if(curl) {
51*6236dae4SAndroid Build Coastguard Worker     curl_easy_setopt(curl, CURLOPT_URL, "wss://example.com");
52*6236dae4SAndroid Build Coastguard Worker 
53*6236dae4SAndroid Build Coastguard Worker     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writecb);
54*6236dae4SAndroid Build Coastguard Worker     /* pass the easy handle to the callback */
55*6236dae4SAndroid Build Coastguard Worker     curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl);
56*6236dae4SAndroid Build Coastguard Worker 
57*6236dae4SAndroid Build Coastguard Worker     /* Perform the request, res gets the return code */
58*6236dae4SAndroid Build Coastguard Worker     res = curl_easy_perform(curl);
59*6236dae4SAndroid Build Coastguard Worker     /* Check for errors */
60*6236dae4SAndroid Build Coastguard Worker     if(res != CURLE_OK)
61*6236dae4SAndroid Build Coastguard Worker       fprintf(stderr, "curl_easy_perform() failed: %s\n",
62*6236dae4SAndroid Build Coastguard Worker               curl_easy_strerror(res));
63*6236dae4SAndroid Build Coastguard Worker 
64*6236dae4SAndroid Build Coastguard Worker     /* always cleanup */
65*6236dae4SAndroid Build Coastguard Worker     curl_easy_cleanup(curl);
66*6236dae4SAndroid Build Coastguard Worker   }
67*6236dae4SAndroid Build Coastguard Worker   return 0;
68*6236dae4SAndroid Build Coastguard Worker }
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