C++Socketサーバ単純コード例

C++Socketサーバ単純コード例

#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")

//    
void main()
{   
    WSADATA wsaData;    
    int errorCode = WSAStartup(MAKEWORD(1,1),&wsaData);
    if (errorCode != 0)
        return;


    SOCKET acceptSocket = socket(AF_INET,SOCK_STREAM,0); 

    SOCKADDR_IN addr;
    addr.sin_family = AF_INET;
    addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    addr.sin_port = htons(6001);        //   

    errorCode = bind(acceptSocket,(SOCKADDR*)&addr,sizeof(SOCKADDR));   
    if (errorCode != 0)
        return;

    errorCode = listen(acceptSocket,5);
    if (errorCode != 0)
        return;

    SOCKADDR_IN sockAddr;
    int len = sizeof(SOCKADDR);

    char recvBuf[5000] = {0};
    char sendBuf[5000] = {0};
    while (true)
    {
        SOCKET clientSocket = accept(acceptSocket,(SOCKADDR*)&sockAddr,&len);
        if (clientSocket == INVALID_SOCKET)
        {
            Sleep(100);
            continue;
        }

        memset(sendBuf,0,5000);
        sprintf(sendBuf,"%s is Connected!\r
",inet_ntoa(sockAddr.sin_addr));
        printf(sendBuf);

        while(true)
        {
            memset(recvBuf,0,5000);
            memset(sendBuf,0,5000);

            int ret = recv(clientSocket,recvBuf, 4999,0);
            if (ret < 0)
                break;      

            sprintf(sendBuf,"Hello %s ,message recved!\r
",inet_ntoa(sockAddr.sin_addr));
            printf(sendBuf);
            ret = send(clientSocket,sendBuf, strlen(sendBuf),0);
            if (ret < 0)
                break;  
        }

        memset(sendBuf,0,5000);
        sprintf(sendBuf,"%s is Closed!\r
",inet_ntoa(sockAddr.sin_addr));
        printf(sendBuf);
        closesocket(clientSocket);

    }
    closesocket(acceptSocket);
    WSACleanup();
}