socket学习笔记——易犯错误

#include
#include<string>
#include 
using namespace std;

#include
#include

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

#define CONNECT_NUM_MAX 10   //最大连接数
#define MSG_MAX_NUM 256        //接受最大数据数
#define MY_PORT 18000        //端口
#define MY_IP 127.0.0.1        //IP

int main()
{
    //0.加载套接字库
    WSADATA wsaData;
    int ret = 0;
    if ((WSAStartup(MAKEWORD(2, 2), &wsaData)) != 0)
    {
        cout <<"WSAStartup(MAKEWORD(2, 2) execute failed!" << endl;
        return -1;
    }
    if (2 != LOBYTE(wsaData.wVersion) || 2 != HIBYTE(wsaData.wVersion))
    {
        WSACleanup();
        cout <<"WSADATA version is not correct" << endl;
        return -1;
    }
    
    //1.创建套接字
    SOCKET sockSer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sockSer == INVALID_SOCKET)
    {
        cout <<"sockSer create fail" << endl;
        return -1;
    }

    //初始化服务器地址族变量
    sockaddr_in serAddr;
    serAddr.sin_family = AF_INET;
    serAddr.sin_port = htons(18000);
    serAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

    int serLen = sizeof(SOCKADDR);

    //2.bind链接
    ret = bind(sockSer, (sockaddr *)&serAddr, serLen);
    if (ret == SOCKET_ERROR)
    {
        cout <<"bind execute fail" << endl;
        closesocket(sockSer);
        WSACleanup();
        return -1;
    }

    //3.listen监听
    ret = listen(sockSer, CONNECT_NUM_MAX);
    if (ret == SOCKET_ERROR)
    {
        cout <<"listen execute failed" << endl;
        closesocket(sockSer);
        return -1;
    }
    else
    {
        cout <<"Server is listening on" <":" <"." << endl;
    }

    //4.accept
    sockaddr_in cliAddr;
    int cliLen = sizeof(SOCKADDR);
    SOCKET sockCli = accept(sockSer, (sockaddr *)&cliAddr, &cliLen);
    if (sockCli == INVALID_SOCKET)
    {
        cout <<"Accepted failed with error code:%d\n" < endl;;
        closesocket(sockSer);
        WSACleanup();
        return -1;
    }
    cout <<"Accepted\n" ;

    //5.recv/send
    char sendMsg[MSG_MAX_NUM];
    char recvMsg[MSG_MAX_NUM];
    while (1)
    {
        ZeroMemory(recvMsg, MSG_MAX_NUM);  //对数组进行初始化
        recv(sockCli, recvMsg, 256,0);
        cout <<"Cli:>"< endl;

        ZeroMemory(sendMsg, MSG_MAX_NUM);
        cout <<"Ser:>";
        cin >> sendMsg;
        send(sockCli, sendMsg, strlen(sendMsg)+1, 0);
        
    }

    //6.close
    closesocket(sockSer);
    return 0;
}

#include
#include<string>
#include
using namespace std;

#include
#include

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

#define MSG_MAX_NUM 256
#define MY_IP 127.0.0.1
#define MY_PORT 18000


int main()
{
    //0.加载套接字库
    WSADATA wsaData;
    int ret = 0;
    if ((WSAStartup(MAKEWORD(2, 2), &wsaData)) != 0)
    {
        cout <<"WSAStartup(MAKEWORD(2, 2), &wsaData) execute failed" << endl;
        return -1;
    }
    if (2 != LOBYTE(wsaData.wVersion) || 2 != HIBYTE(wsaData.wVersion))
    {
        WSACleanup();
        cout <<"WSADATA version is not correct" << endl;
        return -1;
    }
    //1.创建套接字
    SOCKET sockCli = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sockCli == INVALID_SOCKET)
    {
        cout <<"sockCli create failed" << endl;
    }
    //初始化客户端链接服务器端变量
    sockaddr_in serAddr;
    serAddr.sin_family = AF_INET;
    serAddr.sin_port = htons(MY_PORT);
    serAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    
    int serLen = sizeof(sockaddr);
    //2.connect
    ret = connect(sockCli, (sockaddr *)&serAddr, serLen);
    if (ret != 0)
    {
        cout <<"connect failed" << endl;
        closesocket(sockCli);
        WSACleanup();
        cin.get();
        return -1;
    }
    //3.收发消息
    char sendMsg[MSG_MAX_NUM];
    char recvMsg[MSG_MAX_NUM];
    while (1)
    {
        ZeroMemory(sendMsg, MSG_MAX_NUM);
        cout <<"Cli:>";
        cin >> sendMsg;
        send(sockCli, sendMsg, strlen(sendMsg) + 1, 0);

        ZeroMemory(recvMsg, MSG_MAX_NUM);
        recv(sockCli, recvMsg, 256, 0);
        cout <<"Ser:>" < endl;
    }

    //4.关闭套接字
    closesocket(sockCli);
    return 0;
}