static int callback_echo(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) { switch (reason) { case LWS_CALLBACK_ESTABLISHED: // websocket连接建立成功 printf("websocket connection established\n"); break; case LWS_CALLBACK_RECEIVE: // 接收到客户端发送的消息 char *received_data = (char *) in; printf("Received data: %s\n", received_data); // 发送回复消息给客户端 char reply_data[100] = "Hello from server!"; lws_write(wsi, (unsigned char *)reply_data, strlen(reply_data), LWS_WRITE_TEXT); break; default: break; } return 0; } 打印出来的数据,一直不对

这段代码是一个基于libwebsockets库的websocket服务端的回调函数，当websocket连接建立成功或者接收到客户端发送的消息时，会执行不同的操作。你的问题是打印出来的数据一直不对，但是你并没有说明具体的问题和期望的结果。需要更多的信息才能帮助你排查问题。可以检查一下打印出来的数据和期望的结果有什么不同，或者提供更多的代码和上下文信息。

相关问题

#include <stdio.h> #include <string.h> #include <libwebsockets.h> #define BUFFER_SIZE 4096 static struct lws *wsi_client = NULL; static int callback_chat(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) { switch (reason) { case LWS_CALLBACK_CLIENT_ESTABLISHED: // 连接建立，记录wsi_client wsi_client = wsi; break; case LWS_CALLBACK_CLIENT_RECEIVE: // 接收到服务端发来的消息，输出到控制台 printf("[Client] Message received: %s\n", (char *)in); break; case LWS_CALLBACK_CLIENT_CLOSED: // 连接关闭，设置wsi_client为NULL wsi_client = NULL; break; default: break; } return 0; } static struct lws_protocols protocols[] = { { "chat", callback_chat, 0, BUFFER_SIZE }, { NULL, NULL, 0, 0 } }; int main(int argc, char **argv) { struct lws_context_creation_info info; memset(&info, 0, sizeof(info)); info.port = CONTEXT_PORT_NO_LISTEN; info.protocols = protocols; info.gid = -1; info.uid = -1; struct lws_context *context = lws_create_context(&info); if (context == NULL) { fprintf(stderr, "Error: Failed to create libwebsocket context\n"); return -1; } struct lws_client_connect_info connect_info; memset(&connect_info, 0, sizeof(connect_info)); connect_info.context = context; connect_info.address = "localhost"; connect_info.port = 8080; connect_info.path = "/"; connect_info.host = lws_canonical_hostname(context); connect_info.origin = connect_info.host; connect_info.protocol = protocols[0].name; struct lws *wsi = lws_client_connect_via_info(&connect_info); if (wsi == NULL) { fprintf(stderr, "Error: Failed to connect to server\n"); lws_context_destroy(context); return -1; } while (wsi_client == NULL) { lws_service(context, 50); } char buffer[BUFFER_SIZE]; while (fgets(buffer, BUFFER_SIZE, stdin)) { if (wsi_client == NULL) { break; } buffer[strlen(buffer) - 1] = '\0'; lws_write(wsi_client, (unsigned char *)buffer, strlen(buffer), LWS_WRITE_TEXT); } lws_context_destroy(context); return 0; }这段代码是否有问题？

这段代码似乎没有问题，它使用libwebsockets库创建了一个WebSocket客户端，连接到本地主机的端口8080上，并在控制台上显示接收到的消息。在main函数中，先创建一个libwebsocket的上下文，然后通过connect_info结构体配置WebSocket客户端连接信息，最后使用lws_client_connect_via_info函数连接WebSocket服务器。然后使用lws_service函数在while循环中等待连接建立，等到wsi_client不为空时，就可以向服务器发送消息了。在fgets函数中获取输入的消息，使用lws_write函数将消息发送给服务器。最后使用lws_context_destroy函数销毁libwebsockets上下文。