5 librws 为什么要自己写一个接收？

发布于 2022-03-24 21:49:21 浏览：851 订阅该版

ErnestChen1
librws，为什么放着原来的接收代码不用，而是自己写了一个接收的函数：

`rws_bool rws_socket_recv_custom(_rws_socket *s)`

```c
void rws_socket_idle_recv(_rws_socket *s)
{
    _rws_frame *frame = NULL;

if (s->custom_mode != 0x1234)
    {
        if (!rws_socket_recv(s))
        {
            // sock already closed
            if (s->error)
            {
                s->command = COMMAND_INFORM_DISCONNECTED;
            }
            return;
        }

const size_t nframe_size = rws_check_recv_frame_size(s->received, s->received_len);
        if (nframe_size)
        {
            frame = rws_frame_create_with_recv_data(s->received, nframe_size);
            if (frame)
            {
                rws_socket_process_received_frame(s, frame);
            }

if (nframe_size == s->received_len)
            {
                s->received_len = 0;
            }
            else if (s->received_len > nframe_size)
            {
                const size_t nLeftLen = s->received_len - nframe_size;
                memmove((char *)s->received, (char *)s->received + nframe_size, nLeftLen);
                s->received_len = nLeftLen;
            }
        }
    }

/* RT-Thread Team add */
    else            //为什么要用下面的这个函数来接收，我看里面还有一些不完善的代码？  
    {
        if (!rws_socket_recv_custom(s))
        {
            // sock already closed, Todo
            if (s->error)
            {
                s->command = COMMAND_INFORM_DISCONNECTED;
            }
            return;
        }
    }
}
```

用`rws_socket_recv_custom`这个函数的原因是什么呢？ 
是用原来的代码有坑吗？ 
想问问。