C++ Socket編程 基礎一：簡單的server 和client

#include <WINSOCK2.H>
#include <stdio.h>
#pragma comment (lib,"ws2_32.lib")
#define SERVERPORT 6000

int main(int argc,char**argv)
{
	WORD myVersionRequest; 
	WSADATA wsaData ;
	myVersionRequest=MAKEWORD(1,1);
	int err; 


	err=WSAStartup(myVersionRequest,&wsaData);
	if(!err){
		printf("已打開套接字\n"); 
	}else{ 
		printf("ERROR:嵌套字未打開!");
		return 1; 
	}//進一步綁定套接字


	SOCKET serSocket=socket(AF_INET,SOCK_STREAM,0);//創建了可識別套接字
	//需要綁定的參數
	SOCKADDR_IN addr; 
	addr.sin_family=AF_INET;
	addr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
	//ip地址
	addr.sin_port=htons(SERVERPORT);//綁定端口
	bind(serSocket,(SOCKADDR*)&addr,sizeof(SOCKADDR));//綁定完成
	listen(serSocket,5);//其中第二個參數代表能夠接收的最多的連接數
	SOCKADDR_IN clientsocket;
	int len=sizeof(SOCKADDR);
	while(1) { 
		SOCKET serConn=accept(serSocket,(SOCKADDR*)&clientsocket,&len);
		//如果這裏不是accept而是conection的話。。就會不斷的監聽
		char sendBuf[100]; 
		sprintf(sendBuf,"hello, %s !",inet_ntoa(clientsocket.sin_addr));//找對對應的IP並且將這行字打印到那裏
		printf("Send:%s\n",sendBuf); 
		send(serConn,sendBuf,strlen(sendBuf)+1,0);
		char receiveBuf[100];//接收
		recv(serConn,receiveBuf,sizeof(receiveBuf),0);
		printf("recv:%s\n",receiveBuf); 
		closesocket(serConn);//關閉
		WSACleanup();//釋放資源的操作
		return 0; 
	}
	return 1; 
}

客戶端：

#include <WINSOCK2.H>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")
int main(int argc,char **argv)
{
	int err;
	WORD versionRequired;
	WSADATA wsaData;
	versionRequired=MAKEWORD(1,1);
	err=WSAStartup(versionRequired,&wsaData);//協議庫的版本信息
	if (!err)    {
		printf("客戶端嵌套字已經打開!\n");
	}else{
		printf("ERROR:客戶端的嵌套字打開失敗!\n");
		return 1;//結束
	}
	SOCKET clientSocket=socket(AF_INET,SOCK_STREAM,0);

	SOCKADDR_IN clientsock_in;
	clientsock_in.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
	clientsock_in.sin_family=AF_INET;
	clientsock_in.sin_port=htons(6000);

	//bind(clientSocket,(SOCKADDR*)&clientsock_in,strlen(SOCKADDR));//注意第三個參數
	//listen(clientSocket,5);
	connect(clientSocket,(SOCKADDR*)&clientsock_in,sizeof(SOCKADDR));//開始連接
	char receiveBuf[100];
	if(true){

		printf("Send:%s\n","hello,this is client");
		send(clientSocket,"hello,this is client",strlen("hello,this is client")+1,0);

		recv(clientSocket,receiveBuf,101,0);
		printf("Recv:%s\n",receiveBuf);

		closesocket(clientSocket);
		WSACleanup();
	}
	return 0;
}