client.c

最简单的套接字编程

#include <stdio.h>
#include <Winsock2.h>
#pragma comment (lib,"ws2_32.lib") 

int main(void)
{
 	WORD wVersionRequested;
 	WSADATA wsaData;
 	int err;
	SOCKET sockClient;
	SOCKADDR_IN addrSrv;
	char recvBuf[50];
 
 	wVersionRequested = MAKEWORD( 1, 1 );
 
 	err = WSAStartup( wVersionRequested, &wsaData );
 	if ( err != 0 ) 
 	{
		return 0;
 	}
 
 	if ( LOBYTE( wsaData.wVersion ) != 1 || HIBYTE( wsaData.wVersion ) != 1 ) 
 	{
		WSACleanup( );
		return 0;
 	}
 
 	sockClient=socket(AF_INET,SOCK_STREAM,0);
 
 	
 	addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
 	addrSrv.sin_family=AF_INET;
 	addrSrv.sin_port=htons(6000);
 	connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
 	send(sockClient,"hello",strlen("hello")+1,0);
 	
 	recv(sockClient,recvBuf,50,0);
 	printf("%s\n",recvBuf);
 
 	closesocket(sockClient);
 	WSACleanup();
 	return 0;
}