c语言怎么实现websocket

在C语言中实现WebSocket，你可以使用libwebsockets库

1. 首先，确保你已经安装了libwebsockets库。如果没有，请访问官方网站（https://libwebsockets.org/）获取安装说明。对于大多数Linux发行版，你可以使用包管理器（如apt或yum）安装libwebsockets。例如，在Ubuntu上，运行以下命令：

sudo apt-get install libwebsockets-dev 

2. 创建一个名为websocket_example.c的新C文件，并添加以下代码：

#include<stdio.h> #include <stdlib.h> #include<string.h> #include <libwebsockets.h>  static int callback_example(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) {     switch (reason) {         case LWS_CALLBACK_ESTABLISHED:             printf("Connection established\n");             break;         case LWS_CALLBACK_RECEIVE:             printf("Received message: %.*s\n", (int)len, (char *)in);             break;         case LWS_CALLBACK_CLOSED:             printf("Connection closed\n");             break;         default:             break;     }     return 0; }  static struct lws_protocols protocols[] = {     {"example-protocol", callback_example, 0, 0},     {NULL, NULL, 0, 0} };  int main(void) {     struct lws_context_creation_info info;     struct lws_context *context;     const char *p;     int logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE         /* for LLL_ verbosity above NOTICE to be built into lws,          * lws must have been configured and built with          * -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */         /* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */         /* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */         /* | LLL_DEBUG */;      lws_set_log_level(logs, NULL);      memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */     info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */     info.protocols = protocols;     /*      * since we know this lws context is only ever going to be used with      * one client wsis / fds / sockets at a time, let lws know it doesn't      * have to use the default allocations for fd tables up to ulimit -n.      * It will just allocate for 1 internal and 1 (+ 1 http2 nwsi) that      * we will use.      */     info.fd_limit_per_thread = 1 + 1 + 1;      context = lws_create_context(&info);     if (!context) {         lwsl_err("lws init failed\n");         return 1;     }      while (1) {         lws_service(context, 50);     }      lws_context_destroy(context);      return 0; } 

3. 编译并运行示例代码：

gcc websocket_example.c -o websocket_example -lwebsockets ./websocket_example 

4. 使用WebSocket客户端（如websocat）连接到你的WebSocket服务器，并发送消息。你应该会看到连接建立、接收到的消息和连接关闭的日志。

这只是一个简单的示例，展示了如何使用libwebsockets库在C语言中实现WebSocket。你可以根据需要修改代码以满足你的需求。更多关于libwebsockets库的信息和示例，请参阅官方文档（https://libwebsockets.org/git/libwebsockets/tree/README.md?h=main）。