C++网络编程（4）

基本客户端实现

#include <iostream>
#include <arpa/inet.h>
#include <unistd.h>
#include <cstring>
int main()
{
	// make socket
	int soct1=socket(AF_INET,SOCK_STREAM,0);
	if(soct1 == -1)
	{
		std::cerr<<"create socket failed!"<<std::endl;
		return -1;
	}
	// init ip address
	struct sockaddr_in host;
	host.sin_family = AF_INET;
	host.sin_port = htons(12345);
	host.sin_addr.s_addr = INADDR_ANY;
	//connect
	int flag=connect(soct1,(sockaddr*)&host,sizeof(sockaddr));
	if (flag==-1)
	{
		std::cerr<<"connect failed"<<std::endl;
		return -1;
	}
	char buffer[1024];
	//communicate
	while (true)
	{	
		sprintf(buffer,"hello server!");
		send(soct1,buffer,strlen(buffer)+1,0);
		//reset buffer
		memset(buffer,0,sizeof(buffer));
		int rec1=recv(soct1,buffer,sizeof(buffer),0);
		if (rec1>0)
		{
			std::cerr<<buffer<<std::endl;
		}
		else if (rec1=0)
		{
			std::cerr<<"server disconnect"<<std::endl;
		}
		else
		{
			std::cerr<<"send failed"<<std::endl;
		}
		sleep(1);
	}
	close(soct1);
	
}