要在C語言中實(shí)現(xiàn)WebSocket群聊功能,可以使用開源的WebSocket庫來幫助實(shí)現(xiàn)。以下是一個(gè)簡單的示例代碼來演示如何在C語言中創(chuàng)建一個(gè)WebSocket服務(wù)器并實(shí)現(xiàn)群聊功能:
#include <stdio.h>
#include <string.h>
#include <libwebsockets.h>
#define MAX_CLIENTS 10
struct per_session_data {
struct lws *wsi;
};
static struct lws_protocols protocols[] = {
{
.name = "chat-protocol",
.callback = callback_chat,
.per_session_data_size = sizeof(struct per_session_data)
},
{ NULL, NULL, 0, 0 }
};
static int callback_chat(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
struct per_session_data *pss = (struct per_session_data *) user;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
pss->wsi = wsi;
break;
case LWS_CALLBACK_RECEIVE:
// Broadcast message to all connected clients
broadcast_message((const char *) in, len);
break;
default:
break;
}
return 0;
}
void broadcast_message(const char *message, size_t len)
{
struct lws *wsi;
for (int i = 0; i < MAX_CLIENTS; i++) {
wsi = lws_client_wsi_table[i];
if (wsi != NULL) {
lws_write(wsi, (unsigned char *) message, len, LWS_WRITE_TEXT);
}
}
}
int main()
{
struct lws_context *context;
struct lws_context_creation_info info;
memset(&info, 0, sizeof info);
info.port = 8080;
info.protocols = protocols;
context = lws_create_context(&info);
while (1) {
lws_service(context, 50);
}
lws_context_destroy(context);
return 0;
}
在上面的示例代碼中,我們定義了一個(gè)callback_chat
回調(diào)函數(shù)來處理WebSocket連接的各種事件,包括連接建立和消息接收。我們還定義了一個(gè)broadcast_message
函數(shù)來將接收到的消息廣播給所有連接的客戶端。
請注意,這只是一個(gè)簡單的示例代碼,實(shí)際應(yīng)用中可能需要更多的功能和錯(cuò)誤處理。您可以根據(jù)自己的需求對代碼進(jìn)行修改和擴(kuò)展。