关于TCP通信的实现(c++)

久未见 提交于 2020-01-21 15:58:46

  TCP通信机制,采用全双工(就是既可以发送数据,也可以接收数据)的形式进行客户端和服务器之间的链接,并且这是一种可靠数据传输(数据在进行收发的过程中并不会进行损失),并非UDP那样,详细细节,为什么可靠传输,可以参考《计算机网络——自顶向下》,以下代码均采用c++的模式进行实现

  1.TCP------Server

#pragma warning(disable:4996);
#include <iostream>
#include<winsock2.h>
#include<windows.h>
using namespace std;
#pragma comment(lib,"ws2_32.lib")
class TCP
{
public:
    void check_version();
    void intintail();
    void blind_listen();
    void sent_recv();
private:
    WSADATA data;
    SOCKET sock_server;
    SOCKET sock_client;
    SOCKADDR_IN add_server;
    SOCKADDR_IN add_client;

    

};
int main()
{
    TCP a;
    a.check_version();
    a.intintail();
    a.blind_listen();
    a.sent_recv();
  
}
void TCP::check_version()
{
// int ret= WSAStartup(MAKEWORD(2,2),&data);
    if (WSAStartup(MAKEWORD(2,2),&data)!=0)
    {
        cout << "套接字的版本错误" << endl;
        WSACleanup();
    }
    else
    {
        cout << "套接字版本正确" << endl;
    }
}

void TCP::intintail()
{
    //套接字接口的配置
    sock_server = socket(AF_INET, SOCK_STREAM, 0);
    //配置地址的设置
    add_server.sin_family = AF_INET;
    add_server.sin_port = htons();
    add_server.sin_addr.S_un.S_addr =inet_addr("");//填写一个Ip地址
} void TCP::blind_listen() { int n = sizeof(SOCKADDR_IN); int ret = bind(sock_server, (LPSOCKADDR)&add_server, n); if (ret==SOCKET_ERROR) { cout << "套接字绑定失败" << endl; WSACleanup(); } else { cout << "套接字绑定成功" << endl; } //开始监听套接字 int ret2 = listen(sock_server, 10);//第二个参数决定未完成队列和已完成队列中连接数目之和的最大值 if (ret2 == SOCKET_ERROR) { cout << "监听失败" << endl; WSACleanup(); } else { cout << "监听成功" << endl; } } void TCP::sent_recv() { cout << "请稍等。。。" << "\t" << "正在准备链接客户端" << endl; Sleep(3000); while (true) { int len = sizeof(SOCKADDR); //首先开始链接客户端 sock_client = accept(sock_server, (LPSOCKADDR)&add_client, &len); if (sock_client == SOCKET_ERROR) { cout << "链接失败" << endl; WSACleanup(); break; } else { cout << "链接成功" << endl; } //进行数据的收发 char ser[100] = "hello client"; if (send(sock_client, ser,100, 0) == SOCKET_ERROR) { cout << "发送失败" << endl; WSACleanup(); break; } else { cout << "发送成功" << endl; } } }

    2TCP-----Client

#pragma warning(disable:4996);
#include <iostream>
using namespace std;
#include<winsock2.h>
#pragma comment(lib,"ws2_32.lib")
#include<windows.h>
class TCP
{
public:
    void intalize();
    void my_connect();
    void my_recv();

private:
    SOCKET sock_client;
    SOCKADDR_IN  addr_server;
    SOCKADDR_IN  client_ADDR;
    WSADATA data;
public:char rec[100];//接受并且进行打印的数组
      int len;
};

int main()
{
    TCP a;
    a.intalize();
    a.my_connect();
    a.my_recv();
  
}
void TCP::intalize()
{
    if (WSAStartup(MAKEWORD(2, 2), &data) != 0)
    {
        cout << "套接字的版本错误" << endl;
        WSACleanup();
    }
    else
    {
        cout << "套接字版本正确" << endl;
    }
    memset(&addr_server, 0, sizeof(addr_server));
    sock_client=socket(AF_INET, SOCK_STREAM, 0);
    if (sock_client == INVALID_SOCKET)
    {
        cout << "设置失败" << endl;
        WSACleanup();
    }
    else
    {
        cout << "设置成功" << endl;
    }
    addr_server.sin_family = AF_INET;
    addr_server.sin_port = htons();//选择一个电脑的任意端口
    addr_server.sin_addr.S_un.S_addr =inet_addr("");//填写一个Ip地址
    len = sizeof(SOCKADDR_IN);
}

void TCP::my_connect()
{
    if (connect(sock_client,(LPSOCKADDR)&addr_server,len)==SOCKET_ERROR)
    {
        cout << "连接失败" << endl;
        WSACleanup();
    }
    else
    {
        cout << "连接成功" << endl;
    }
}

void TCP::my_recv()
{

    if (recv(sock_client,rec,1,0)==SOCKET_ERROR)
    {
        cout << "接收失败" << endl;
        WSACleanup();
    }
    else
    {
        cout << "接收成功" << endl;
        cout << "服务器的信息是:" << rec << endl;
    }
}

  【remark】

对于inet_addr()的调用,在vs2017 和vs2019中若不加上#pragma warning(disable:4996);都会因为版本的问题进行报错

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