c++实现socket通信测试

服务器端代码：

// socketTest.cpp : 定义控制台应用程序的入口点。
//


#include "stdafx.h"
#include <iostream>
#include <winsock.h>


#pragma  comment (lib,"ws2_32.lib")
#define  MAXBUFLEN 256
#define  PORT 44965

using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
	WSADATA Data;
	SOCKADDR_IN serverSockAddr;
	SOCKADDR_IN clientSockAddr;
	SOCKET serversocket;  //其实就是一个unsig int类型，用来记录已经建立或者尚未建立的套接字号
	SOCKET clientsocket;
	int addrlen = sizeof(SOCKADDR_IN);   //16
	int status;
	int numrcv;
	char buffer[MAXBUFLEN];

	//初始化windows Socket Dll
	status = WSAStartup(MAKEWORD(1,1),&Data);
	if (0!=status)
	{
		cout<<"初始化失败"<<endl;
	}

	//清0
	memset(&serverSockAddr,0,sizeof(serverSockAddr));
	//初始化
	serverSockAddr.sin_port = htons(PORT);
	serverSockAddr.sin_family = AF_INET;    //指定地址协议族
	serverSockAddr.sin_addr.s_addr = htonl(INADDR_ANY);  //初始化ip地址0,0,0,0 任何ip都可以连接

	//创建套接字
	serversocket = socket(AF_INET,SOCK_STREAM/*套接字类型*/,0/*套接字使用的特定协议*/);
	if (INVALID_SOCKET == serversocket)
	{
		cout<<"创建socket失败"<<endl;
	}

	//绑定socket到特定地址(结构体地址)
	status = bind(serversocket,(LPSOCKADDR)&serverSockAddr,sizeof(serverSockAddr));
	if (SOCKET_ERROR==status)
	{
		cout<<"绑定地址失败"<<endl;
	}

	//允许外来申请链接请求，或者说就是监听
	status = listen(serversocket/*套接字号*/,2/*最大容许链接的套接字个数*/);
	if (SOCKET_ERROR == status)
	{
		cout<<"监听失败"<<endl;
	}

	//当有请求申请是就接受链接请求
	clientsocket = accept(serversocket,(LPSOCKADDR)&clientsocket,&addrlen);


	while(1)
	{
		numrcv = recv(clientsocket/*已经建立的套接字*/,buffer/*接受输入数据缓冲器的指针*/,MAXBUFLEN/*接受缓冲区大小*/,0/*传输控制方式*/);

		if ((0==numrcv)||(numrcv==SOCKET_ERROR))
		{
			cout<<"链接受到限制"<<endl;

			status = closesocket(clientsocket);
			if (SOCKET_ERROR==status)
				cout<<"断开链接失败"<<endl;

			status = WSACleanup();
			if (SOCKET_ERROR==status)
				cout<<"清理链接失败"<<endl;
			return(1);
		}
		cout<<"接受到客户端发过来的消息内容是："<<buffer<<endl;

		cout<<"输入想要发送给客户端发送的消息内容并按回车发送"<<endl;

		int numsnt;
		char *toSendtxt=new char[256];
		cin>>toSendtxt;

		numsnt=send(clientsocket, toSendtxt, strlen(toSendtxt) + 1, 0);
		if (numsnt != (int)strlen(toSendtxt) + 1)
		{
			cout << "Connection terminated" << endl;

			status=closesocket(clientsocket);
			if (status == SOCKET_ERROR)
				cout<< "ERROR: closesocket unsuccessful" << endl;
			status=WSACleanup();
			if (status == SOCKET_ERROR)
				cout<< "ERROR: WSACleanup unsuccessful" << endl;
			return(1);
		}
		cout<<"等待继续接受客户端发来的消息.........."<<endl;
		
	}

	return 0;
}

/*总结通信服务器端，建立一个socket通信，        socket()
                    绑定这个socket到地址结构体，bind()
					监听外来申请建立链接请求,   listen() 
					接受外来申请的链接请求,     accept()
					接受客户端发来的消息内容，  recv()
					向客户端发送消息，          send()
*/

 

客户端代码：

// socketclientTest.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>

#include <winsock.h>

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

#define  MAXBUFLEN 256
#define PORT 44965
#define DEST_IP_ADDR "127.0.0.1" //想要链接的目标Server address

using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
	WSADATA Data;
	SOCKADDR_IN destSockAddr;
	SOCKET destSocket;
	unsigned long destAddr;
	int status;
	

	/* initialize the Windows Socket DLL */
	status=WSAStartup(MAKEWORD(1, 1), &Data);
	if (status != 0)
		cout<< "ERROR: WSAStartup unsuccessful"<<endl;

	/* convert IP address into in_addr form */
	destAddr=inet_addr(DEST_IP_ADDR);
	/* copy destAddr into sockaddr_in structure */
	memcpy(&destSockAddr.sin_addr, &destAddr, sizeof(destAddr));
	/* specify the port portion of the address */
	destSockAddr.sin_port=htons(PORT);
	/* specify the address family as Internet */
	destSockAddr.sin_family=AF_INET;

	/* create a socket */
	destSocket=socket(AF_INET, SOCK_STREAM, 0);
	if (destSocket == INVALID_SOCKET)
	{
		cout<< "ERROR: socket unsuccessful" << endl;

		status=WSACleanup();
		if (status == SOCKET_ERROR)
			cout<< "ERROR: WSACleanup unsuccessful" << endl;
		return(1);
	}
	
	cout<< "Trying to connect to IP Address: " << DEST_IP_ADDR <<endl;

	/* connect to the server */
	status=connect(destSocket, (LPSOCKADDR)&destSockAddr, sizeof(destSockAddr));
	if (status == SOCKET_ERROR)
	{
		cout<< "ERROR: connect unsuccessful" << endl;

		status=closesocket(destSocket);
		if (status == SOCKET_ERROR)
			cout<< "ERROR: closesocket unsuccessful"
			<< endl;
		status=WSACleanup();
		if (status == SOCKET_ERROR)
			cout<< "ERROR: WSACleanup unsuccessful"
			<< endl;
		return(1);
	}

	cout << "Connected..." << endl;

	while(1)
	{
		int numsnt;
		char *toSendtxt=new char[256];
		cout << "输入想要发送给服务器的消息内容并按回车发送:" << endl;
		cin>>toSendtxt;
		numsnt=send(destSocket, toSendtxt, strlen(toSendtxt) + 1, 0);
		if (numsnt != (int)strlen(toSendtxt) + 1)
		{
			cout << "Connection terminated" << endl;

			status=closesocket(destSocket);
			if (status == SOCKET_ERROR)
				cout<< "ERROR: closesocket unsuccessful" << endl;
			status=WSACleanup();
			if (status == SOCKET_ERROR)
				cout<< "ERROR: WSACleanup unsuccessful" << endl;
			return(1);
		}

		/* Wait before sending the message again */
		cout<<"向服务器发送的消息已经成功发送现在等待接受服务器发来的消息......"<<endl;
		int numrcv;
		char buffer[MAXBUFLEN];
		numrcv = recv(destSocket/*已经建立的套接字*/,buffer/*接受输入数据缓冲器的指针*/,MAXBUFLEN/*接受缓冲区大小*/,0/*传输控制方式*/);

		if ((0==numrcv)||(numrcv==SOCKET_ERROR))
		{
			cout<<"链接受到限制"<<endl;

			status = closesocket(destSocket);
			if (SOCKET_ERROR==status)
				cout<<"断开链接失败"<<endl;

			status = WSACleanup();
			if (SOCKET_ERROR==status)
				cout<<"清理链接失败"<<endl;
			return(1);
		}
		cout<<"服务器发来的消息内容是："<<buffer<<endl;
		
	} /* while */
	return 0;
}

/*总结通信客户端，  建立一个socket通信，          socket()
                    链接目标服务器端，            connect()
                    向服务器发送消息，            send()
					接受服务器端发来的消息内容，  recv()
					
*/