windows socket 簡單實例

Windows下Socket編程主要包括以下幾部分：
服務端
   1、初始化Windows Socket庫。
   2、創建Socket。
   3、綁定Socket。
   4、監聽。
   5、Accept。
   6、接收、發送數據。

客戶端
   1、初始化Windows Socket庫。
   2、創建Socket。
   3、連接Socket。
   4、接收、發送數據。

服務端每接收到一個客戶端的Socket,則創建一個線程。滿足一個服務端連接多個客戶端。

//Server.cpp
#include <iostream>
#include <winsock2.h>

using namespace std;

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

#define PORT 4000
#define IP_ADDRESS "10.241.39.19"


DWORD WINAPI ClientThread(LPVOID lpParameter)
{
    SOCKET CientSocket = (SOCKET)lpParameter;
    int Ret = 0;
    char RecvBuffer[MAX_PATH];

    while ( true )
    {
        memset(RecvBuffer, 0x00, sizeof(RecvBuffer));
        Ret = recv(CientSocket, RecvBuffer, MAX_PATH, 0);
        if ( Ret == 0 || Ret == SOCKET_ERROR ) 
        {
            cout<<"客戶端退出!"<<endl;
            break;
        }
        cout<<"接收到客戶信息為:"<<RecvBuffer<<endl;
    }

    return 0;
}

int main(int argc, char* argv[])
{
    WSADATA  Ws;
    SOCKET ServerSocket, ClientSocket;
    struct sockaddr_in LocalAddr, ClientAddr;
    int Ret = 0;
    int AddrLen = 0;
    HANDLE hThread = NULL;

    //Init Windows Socket
    if ( WSAStartup(MAKEWORD(2,2), &Ws) != 0 )
    {
        cout<<"Init Windows Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    //Create Socket
    ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if ( ServerSocket == INVALID_SOCKET )
    {
        cout<<"Create Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    LocalAddr.sin_family = AF_INET;
    LocalAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS);
    LocalAddr.sin_port = htons(PORT);
    memset(LocalAddr.sin_zero, 0x00, 8);

    //Bind Socket
    Ret = bind(ServerSocket, (struct sockaddr*)&LocalAddr, sizeof(LocalAddr));
    if ( Ret != 0 )
    {
        cout<<"Bind Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }
    //listen
    Ret = listen(ServerSocket, 10);
    if ( Ret != 0 )
    {
        cout<<"listen Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    cout<<"服務端已經啟動"<<endl;

    while ( true )
    {
        AddrLen = sizeof(ClientAddr);
        ClientSocket = accept(ServerSocket, (struct sockaddr*)&ClientAddr, &AddrLen);
        if ( ClientSocket == INVALID_SOCKET )
        {
            cout<<"Accept Failed::"<<GetLastError()<<endl;
            break;
        }

        cout<<"客戶端連接::"<<inet_ntoa(ClientAddr.sin_addr)<<":"<<ClientAddr.sin_port<<endl;

        hThread = CreateThread(NULL, 0, ClientThread, (LPVOID)ClientSocket, 0, NULL);
        if ( hThread == NULL )
        {
            cout<<"Create Thread Failed!"<<endl;
            break;
        }

        CloseHandle(hThread);
    }

    closesocket(ServerSocket);
    closesocket(ClientSocket);
    WSACleanup();

    return 0;
}

// Client.cpp
#include <iostream>
#include <winsock2.h>

using namespace std;

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

#define PORT 4000
#define IP_ADDRESS "10.241.39.19"

int main(int argc, char * argv[])
{
    WSADATA Ws;
    SOCKET ClientSocket;
    struct sockaddr_in ServerAddr;
    int Ret = 0;
    int AddrLen = 0;
    HANDLE hThread = NULL;
    char SendBuffer[MAX_PATH];

    //Init Windows Socket
    if ( WSAStartup(MAKEWORD(2,2), &Ws) != 0 )
    {
        cout<<"Init Windows Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }
    //Create Socket
    ClientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if ( ClientSocket == INVALID_SOCKET )
    {
        cout<<"Create Socket Failed::"<<GetLastError()<<endl;
        return -1;
    }

    ServerAddr.sin_family = AF_INET;
    ServerAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS);
    ServerAddr.sin_port = htons(PORT);
    memset(ServerAddr.sin_zero, 0x00, 8);

    Ret = connect(ClientSocket,(struct sockaddr*)&ServerAddr, sizeof(ServerAddr));
    if ( Ret == SOCKET_ERROR )
    {
        cout<<"Connect Error::"<<GetLastError()<<endl;
        return -1;
    }
    else
    {
        cout<<"連接成功!"<<endl;
    }

    while ( true )
    {
        cin.getline(SendBuffer, sizeof(SendBuffer));
        Ret = send(ClientSocket, SendBuffer, (int)strlen(SendBuffer), 0);
        if ( Ret == SOCKET_ERROR )
        {
            cout<<"Send Info Error::"<<GetLastError()<<endl;
            break;
        }
    }

    closesocket(ClientSocket);
    WSACleanup();

    return 0;
}