1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24/* <DESC>
25 * WebSocket download-only using write callback
26 * </DESC>
27 */
28#include <stdio.h>
29#include <curl/curl.h>
30
31static size_t writecb(char *b, size_t size, size_t nitems, void *p)
32{
33  CURL *easy = p;
34  size_t i;
35  const struct curl_ws_frame *frame = curl_ws_meta(easy);
36  fprintf(stderr, "Type: %s\n", frame->flags & CURLWS_BINARY ?
37          "binary" : "text");
38  fprintf(stderr, "Bytes: %u", (unsigned int)(nitems * size));
39  for(i = 0; i < nitems; i++)
40    fprintf(stderr, "%02x ", (unsigned char)b[i]);
41  return nitems;
42}
43
44int main(void)
45{
46  CURL *curl;
47  CURLcode res;
48
49  curl = curl_easy_init();
50  if(curl) {
51    curl_easy_setopt(curl, CURLOPT_URL, "wss://example.com");
52
53    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writecb);
54    /* pass the easy handle to the callback */
55    curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl);
56
57    /* Perform the request, res will get the return code */
58    res = curl_easy_perform(curl);
59    /* Check for errors */
60    if(res != CURLE_OK)
61      fprintf(stderr, "curl_easy_perform() failed: %s\n",
62              curl_easy_strerror(res));
63
64    /* always cleanup */
65    curl_easy_cleanup(curl);
66  }
67  return 0;
68}
69