C++ 套接字、多线程和输出处理

Question

我想制作聊天系统。它应该写你:然后你输入的任何内容，每当你从其他用户那里收到文本时，只需删除你:输入用户:消息和你:再次。

服务器:

        std::cin.ignore();
        std::thread t1(readData,&acceptedSocket);
        do{
            memset(buffer,0,sizeof(buffer));
            std::cout << "You: ";
            std::cin.getline(buffer,255);
            n = send(acceptedSocket,buffer,strlen(buffer),0);
        }while(n > 0);

客户:

    std::cin.ignore();
    std::thread t1(readData,&connectingSocket);
    do{
        memset(buffer,0,sizeof(buffer));
        std::cout << "You: ";
        std::cin.getline(buffer,255);
        n = send(connectingSocket,buffer,strlen(buffer),0);
    }while(n > 0);

读取数据:

void readData(int *socketPointer){
    int connectingSocket = *socketPointer;
    char buffer[256];
    memset(buffer,0,sizeof(buffer));
    while(recv(connectingSocket,buffer,255,0)){
        std::cout << "\b\b\b\b\bUSER:" << buffer << std::endl << "You: ";
        memset(buffer,0,sizeof(buffer));
    }
}

输出:

服务器:

USER:Hello
USER:How are u doing
Hi
You: You: I am fine
USER:gg
wp
You: You:

客户:

You: Hello
You: How are u doing
USER:Hi
USER:I am fine
gg
You: USER:wp

Wannable 服务器输出:

USER:Hello
USER:How are u doing
You: Hi
You: I am fine
USER:gg
You: wp
You: 

Wannable 客户端输出:

You: Hello
You: How are u doing
USER:Hi
USER:I am fine
You: gg
USER:wp
You:

在其他线程中有cin获取换行时，似乎不能输入换行符。谢谢!

Answer 1

我找到答案了!我注意到当两个线程正在运行时——一个从 cin 流中获取行，另一个正在输出文本，你需要刷新 cout 缓冲区，所以只有文本只出现在 std::endl 之后，它刷新缓冲区并放入新的同时行所以:

std::cout.flush():

解决问题:

    std::cout << "\b\b\b\b\bUSER:" << buffer << std::endl << "You: ";
    std::cout.flush();