client

#define _CRT_SECURE_NO_DEPRECATE

#include <stdio.h> 
#include <stdlib.h>
#include <winsock2.h>
#include <iostream>
using namespace std;
#define SERVER_PORT 5208 //侦听端口

#pragma comment(lib,"wsock32.lib")

int main()
{
	WORD wVersionRequested;
	WSADATA wsaData;
	int ret,flag,i;
	SOCKET sClient; //连接套接字
	struct sockaddr_in saServer; //地址信息
	char *ptr;
	BOOL fSuccess = TRUE;
	//WinSock初始化
	wVersionRequested = MAKEWORD(2, 2); //希望使用的WinSock DLL的版本
	ret = WSAStartup(wVersionRequested, &wsaData);
	if(ret!=0)
	{
        printf("WSAStartup() failed!\n");
        return 5;
	}
	//确认WinSock DLL支持版本2.2
	if(LOBYTE(wsaData.wVersion)!=2 || HIBYTE(wsaData.wVersion)!=2)
	{
        WSACleanup();
        printf("Invalid WinSock version!\n");
        return 4;
	}
	//创建Socket,使用TCP协议
	sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (sClient == INVALID_SOCKET)
	{
        WSACleanup();
        printf("socket() failed!\n");
        return 3;
	}
	//构建服务器地址信息
	saServer.sin_family = AF_INET; //地址家族
	saServer.sin_port = htons(SERVER_PORT); //注意转化为网络节序
	saServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	//连接服务器
	ret = connect(sClient, (struct sockaddr *)&saServer, sizeof(saServer));
	if (ret == SOCKET_ERROR)
	{
        printf("connect() failed!\n");
        closesocket(sClient); //关闭套接字
        WSACleanup();
        return 2;
	}
 
	char sendMessage[]="Hello this is client message.Here's Roy speaking!\n"; 
	ret = send (sClient, (char *)&sendMessage, sizeof(sendMessage), 0);
	char message[100],message2[100],receivemessage[100];
	if (ret == SOCKET_ERROR)
		{
			printf("send() failed!\n");
			return 1;
		}
	while(1)
	{
		printf("1.just listen\t2.say something: ");
		scanf("%d",&flag);
		if(flag == 2)
		{
			if (ret == SOCKET_ERROR)
			{
				printf("send() failed!\n");
				return 1;
			}
			printf("\nEnter what you wanna say:\n");
			
			/*scanf("%s",message);
			printf("%s",message);*/

			getchar();
			gets(message);
			ret = send (sClient, (char *)&message, sizeof(message), 0);
			if (ret == SOCKET_ERROR)
			{
				printf("send() failed!\n");
				return 1;
			}
		}
		if(flag == 1)
		{
			ret = recv(sClient, receivemessage, 100, 0);
			if (ret == SOCKET_ERROR)
			{
				printf("send() failed!\n");
				return 1;
			}
			printf("Server said:  %s\n",receivemessage);
		}
	}
	closesocket(sClient); //关闭套接字
	WSACleanup();
}