基于udp的socket网络编程

套接字

网络套接字

原始套接字

unix套接字

windows下SOCKET 为整数。

协议家族 套接字种类 协议

udpServer.cc

#pragma warning(disable:4996)
#include<iostream>
#include<string>
#include<cstdlib>
#include<WinSock2.h>

#pragma comment(lib,"ws2_32.lib")

using namespace std;

uint16_t serverport = 8080;
string serverip = "192.168.88.130";
int main()
{
	WSAData wsd;           //初始化信息
    //启动Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0) {/*进行WinSocket的初始化,
        windows 初始化socket网络库，申请2，2的版本，windows socket编程必须先初始化。*/
        cout << "WSAStartup Error = " << WSAGetLastError() << endl;
        return 0;
    }
    else {
        cout << "WSAStartup Success" << endl;
    }
    //创建套接字
    SOCKET csock = socket(AF_INET, SOCK_DGRAM, 0);
    if (csock == SOCKET_ERROR)
    {
        cout << "socket Error = " << WSAGetLastError() << endl;
        return 1;
    }
    else {
        cout << "socket Success" << endl;
    }
    //udp客户端不需要显示的绑定,但可以指定
    struct sockaddr_in server;
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);
    //将字符串转为点分十进制的ip
    server.sin_addr.s_addr = inet_addr(serverip.c_str());
#define NUM 1024
    char inbuffer[NUM];

    //将信息发出
    string line;
    while (true)
    {
        cout << "Please Enter# ";
        getline(cin, line);
        int n = sendto(csock, line.c_str(), line.size(), 0, (struct sockaddr*)&server, sizeof(server));
        if (n < 0)
        {
            cerr << "sendto error!!!" << endl;
            break;
        }
        struct sockaddr_in peer; 
        int peerlen = sizeof(peer);
        //收取数据
        inbuffer[0] = 0;
        n = recvfrom(csock, inbuffer, sizeof(inbuffer)-1,0, (struct sockaddr*)&peer, &peerlen);
    }
    closesocket(csock);
    WSACleanup();
	return 0;
}

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