74 lines
1.7 KiB
Markdown
74 lines
1.7 KiB
Markdown
---
|
|
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
|
|
SPDX-License-Identifier: curl
|
|
Title: curl_ws_recv
|
|
Section: 3
|
|
Source: libcurl
|
|
See-also:
|
|
- curl_easy_getinfo (3)
|
|
- curl_easy_perform (3)
|
|
- curl_easy_setopt (3)
|
|
- curl_ws_send (3)
|
|
- libcurl-ws (3)
|
|
---
|
|
|
|
# NAME
|
|
|
|
curl_ws_recv - receive WebSocket data
|
|
|
|
# SYNOPSIS
|
|
|
|
~~~c
|
|
#include <curl/curl.h>
|
|
|
|
CURLcode curl_ws_recv(CURL *curl, void *buffer, size_t buflen,
|
|
size_t *recv, const struct curl_ws_frame **meta);
|
|
~~~
|
|
|
|
# DESCRIPTION
|
|
|
|
This function call is EXPERIMENTAL.
|
|
|
|
Retrieves as much as possible of a received WebSocket data fragment into the
|
|
**buffer**, but not more than **buflen** bytes. *recv* is set to the
|
|
number of bytes actually stored.
|
|
|
|
If there is more fragment data to deliver than what fits in the provided
|
|
*buffer*, libcurl returns a full buffer and the application needs to call
|
|
this function again to continue draining the buffer.
|
|
|
|
The *meta* pointer gets set to point to a *const struct curl_ws_frame*
|
|
that contains information about the received data. See the
|
|
curl_ws_meta(3) for details on that struct.
|
|
|
|
# EXAMPLE
|
|
|
|
~~~c
|
|
int main(void)
|
|
{
|
|
size_t rlen;
|
|
const struct curl_ws_frame *meta;
|
|
char buffer[256];
|
|
CURL *curl = curl_easy_init();
|
|
if(curl) {
|
|
CURLcode res = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
|
|
if(res)
|
|
printf("error: %s\n", curl_easy_strerror(res));
|
|
}
|
|
}
|
|
~~~
|
|
|
|
# AVAILABILITY
|
|
|
|
Added in 7.86.0.
|
|
|
|
# RETURN VALUE
|
|
|
|
Returns **CURLE_OK** if everything is okay, and a non-zero number for
|
|
errors. Returns **CURLE_GOT_NOTHING** if the associated connection is
|
|
closed.
|
|
|
|
Instead of blocking, the function returns **CURLE_AGAIN**. The correct
|
|
behavior is then to wait for the socket to signal readability before calling
|
|
this function again.
|