client.cpp

vc++ Socket编程入门程序

#include <stdio.h>
#include <winsock2.h>
#define DATA "hello world!!"

void main(argc,argv)
{
	int argc;
	char *argv[];
	int sockid;
	struct sockaddr_in server_addr; //服务器的地址结构
	int err;
    WORD wVersionRequested; //需要的版本号
	WSADATA wsaData; //协商时使用的变量

	wVersionRequested=MAKEWORD(1,1);
	 
	//启动socket
	err=WSAStartup(wVersionRequested,&wsaData);
	
	//建立socket
	sockid=socket(AF_INET,SOCK_STREAM,0);
	if(sockid<0)
	{
		perror("there is error in opening stream socket");
		return;
	}

	//设置地址域
	server_addr.sin_family=AF_INET;
	//得到命令行中指定的服务器的提供服务的端口
	server_addr.sin_port=htons((unsigned short)atoi(argv[2]));

	//进行连接
	if(connect(sockid,(struct sockaddr*)&server_addr,sizeof(server_addr))<0)
	{
		perror("there is error in connecting stream socket");
		return;
	}

	//进行数据发送
	if((send(sockid,DATA,sizeof(DATA),0))<0)
	{
		perror("there is error in sending the data");
		return;
	}
	else
	{
		//发送成功
		printf("Sending successfully");
	}

	//关闭socket
	closesocket(sockid);
	WSACleanup();
	return;
}