Windows Socket编程TCP范例

参考文章:
1.Windows Socket编程
2.揭开Socket编程的面纱

    Windows下Socket TCP编程的大体流程如下：
    Server端
      1、初始化Windows Socket库.
      2、创建Socket.
      3、绑定Socket.
      4、监听.
      5、Accept.
      6、接发数据.
    Client端
      1、初始化Windows Socket库.
      2、创建Socket.
      3、连接.
      4、接发数据.

    以下示例中，服务端接受客户端连接，并创建线程接收数据并输出。
    客户端连接服务端，并向服务器端发送数据。
    即非常简单的：Client端向Server端发送数据,Server端为每个Client端连接创建一个线程以接收数据并输出,连接结束则结束对应线程。

Server.cpp

#include <iostream>
#include <windows.h>
#include <process.h>

using namespace std;

#pragma comment(lib, "Ws2_32.lib")

#define PORT_NO 6000
#define BACKLOG 10

unsigned __stdcall clientThrd(void *lpParam)
{
	SOCKET sockClient = (SOCKET)lpParam;
	int ret = 0;
	char recvBuffer[MAX_PATH] = {0};

	// 接收数据------
	while (1)
	{
		memset(recvBuffer, 0, sizeof(recvBuffer));
		ret = recv(sockClient, recvBuffer, sizeof(recvBuffer), 0);
		if (ret == 0)
		{
			cout << "Connection has been gracefully closed." << endl;
			break;
		}
		else if (ret == SOCKET_ERROR) 
		{
			cout << "Connection has been closed ungracefully." << endl;
			break;
		}

		cout << "Receive Data from Client:" << recvBuffer << endl;
	}

	closesocket(sockClient);

	return 0;
}

int main(int argc, char* argv[])
{
	WSADATA wsaData;
	int ret;
	WORD wVersionRequested = MAKEWORD(2, 2);
	SOCKET sockSrv, sockConn;
	SOCKADDR_IN addrSrv, addrClient;
	HANDLE hThread = NULL;
	
	// 初始化Windows Socket------
	ret = WSAStartup(wVersionRequested, &wsaData);
	if (ret != 0) 
	{
		cout << "WSAStartup() failed:" << WSAGetLastError() << endl;
		return -1;
	}

	// 创建Socket------
	sockSrv = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == sockSrv)
	{
		cout << "socket() failed:" << WSAGetLastError() << endl;
		WSACleanup();
		return -1;
	}
	addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(PORT_NO);

	// Bind Socket------
	ret = bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));
	if (SOCKET_ERROR == ret)
	{
		cout << "bind() failed:" << WSAGetLastError() << endl;
		closesocket(sockSrv);
		WSACleanup();
		return -1;
	}

	// 监听------
	ret = listen(sockSrv, BACKLOG);
	if (SOCKET_ERROR == ret)
	{
		cout << "listen() failed:" << WSAGetLastError() << endl;
		closesocket(sockSrv);
		WSACleanup();
		return -1;
	}

	cout<< "Server started......" << endl;

	// Accept------
	int len=sizeof(SOCKADDR);
	while(1)
	{
		sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
		if (INVALID_SOCKET == sockConn)
		{
			cout << "accept() failed:" << WSAGetLastError() << endl;
			break;
		}
		hThread = (HANDLE)_beginthreadex(NULL, 0, clientThrd, (void*)sockConn, 0, NULL);
		if (hThread == 0)
		{
			cout << "_beginthreadex() failed." << endl;
			break;
		}
		CloseHandle(hThread);
	}

	// 清理资源------
	closesocket(sockSrv);
	WSACleanup();

	cout << "exit..." << endl;
	return 0;
}

Client.cpp

#include <iostream>
#include <windows.h>

using namespace std;

#pragma comment(lib, "Ws2_32.lib")

#define PORT_NO 6000
#define SRV_IP_ADDR "127.0.0.1"

int main(int argc, char* argv[])
{
	int ret;
	WSADATA wsaData;
	WORD wVersionRequested = MAKEWORD(2, 2);
	SOCKET sockClient;
	SOCKADDR_IN addrSrv;
	
	// 初始化Windows Socket------
	ret = WSAStartup(wVersionRequested, &wsaData);
	if (ret != 0) 
	{
		cout << "WSAStartup() failed:" << WSAGetLastError() << endl;
		return -1;
	}

    // 创建Socket------
	sockClient = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == sockClient)
	{
		cout << "socket() failed:" << WSAGetLastError() << endl;
		WSACleanup();
		return -1;
	}

	addrSrv.sin_addr.S_un.S_addr = inet_addr(SRV_IP_ADDR);
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(PORT_NO);

	// 连接------
	ret = connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));
	if (SOCKET_ERROR == ret)
	{
		cout << "connect() failed:" << WSAGetLastError() << endl;
		closesocket(sockClient);
		WSACleanup();
		return -1;
	}
	else
	{
		cout << "connect() successfully." << endl;
	}

	// 发送数据------
	char sendBuf[MAX_PATH] = {0};
	while (1)
	{
		cin.getline(sendBuf, sizeof(sendBuf));
		if (strcmp(sendBuf, "exit") == 0)
		{
			break;
		}
		ret = send(sockClient, sendBuf, strlen(sendBuf)+1, 0);
		if (SOCKET_ERROR == ret)
		{
			cout << "send() failed:" << WSAGetLastError() << endl;
			closesocket(sockClient);
			WSACleanup();
			return -1;
		}
	}

	// 清理资源-------
	closesocket(sockClient);
	WSACleanup();

	cout << "exit..." << endl;
	return 0;
}