windows socket 简单实现

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Windows下Socket编程主要包括以下几部分：
服务端
   1、初始化Windows Socket库。
   2、创建Socket。
   3、绑定Socket。
   4、监听。
   5、Accept。
   6、接收、发送数据。

客户端
   1、初始化Windows Socket库。
   2、创建Socket。
   3、连接Socket。
   4、接收、发送数据。

服务端每接收到一个客户端的Socket,则创建一个线程。满足一个服务端连接多个客户端。

服务端代码如下：

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

using namespace std;
#pragma comment(lib, "ws2_32.lib")
#define PORT 4000
#define IP_ADDRESS "127.0.0.1"

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<<"客户端退出!"<<endl;
break;
}
cout<<"接收到客户信息为:"<<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<<"服务端已经启动"<<endl;

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

cout<<"客户端连接::"<<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);
}

//Close
closesocket(ServerSocket);
closesocket(ClientSocket);
WSACleanup();

return 0;
}

客户端代码如下：

// 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<<"连接成功!"<<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;
}
}

//Close
closesocket(ClientSocket);
WSACleanup();

return 0;
}

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