发送数据hello函数执行了两次。

[AIGPTchina]

void CPosSysView::OnButton2() 
{
	char key[33]={0};
	char scport[10]={0};
	char dsp[1024];
	char dspbuffer[1024]={0};
	unsigned short usport;
	bool handshavar=FALSE;
	
	
	usport = atoi(scport);
	
	
	WSADATA wsa_data;
    SOCKET msg_soc = 0; /* 客户端 socket 句柄 */
    struct sockaddr_in srv_addr;   /* 客户端地址 */
    unsigned short port = 3456;
    int result = 0, ready, addr_len = sizeof(srv_addr);
    u_long non_block = 1;
    int  retflag = FALSE;
    char data_buf[2048*10];

    char *ip_addr = "127.0.0.1";
	
    fd_set read_all, read_set, write_all, *write_fds = NULL;
    struct timeval timeval = { 5000, 0 };
	
	
    WSAStartup(WINSOCK_VERSION, &wsa_data); /* 初始化 WinSock 资源 */
    msg_soc = socket(AF_INET, SOCK_STREAM, 0);
    result = ioctlsocket(msg_soc, FIONBIO, &non_block);

    /* 设置 socket 集合 */
    FD_ZERO(&read_all);
    FD_ZERO(&write_all);
    FD_SET(msg_soc, &read_all);

    /* 填写要连接的服务器 */
    srv_addr.sin_family = AF_INET;
    srv_addr.sin_port = htons(port);
    srv_addr.sin_addr.s_addr = inet_addr(ip_addr);
	

    result = connect(msg_soc, (struct sockaddr *)&srv_addr, addr_len);
    if (result == 0) /* 连接成功 */
	{	
        write_fds = NULL;
    }
	else if (WSAGetLastError() == WSAEWOULDBLOCK)
    {
        write_fds = &write_all;
        FD_SET(msg_soc, &write_all);
    }
    else
    {
        closesocket(msg_soc);
    }

    while (1)
    {
		/* 设置 socket 集合 */
		FD_ZERO(&read_all);
		FD_SET(msg_soc, &read_all);
        read_set = read_all;
		struct timeval timeval = {5000, 0 };
        ready = select(0, &read_set, write_fds, NULL, &timeval);
        if (ready <= 0) /* 出错或超时 */
        {
            break;
        }

        /* 连接成功的 socket 是可写的 */
        if (write_fds && FD_ISSET(msg_soc, write_fds))
        {
            sock = msg_soc;
			if(handshavar == false)
			{
			    hello();//不知道为什么这个函数执行了两次？			    //break;
			    //write_fds = NULL;
			}
			else if(handshavar == true)
			{
				ticate();
				retflag = true;
			}
        }
		
        if (FD_ISSET(msg_soc, &read_set)) /* socket 有数据可以读 */
        {
            result = recv(msg_soc, data_buf, 8196, 0);
            if (result > 0)
            {
                data_buf[result] = 0;
				handshavar = true;
				if (retflag == true)
				{
					break;
				}
            }
            else
			{
                break;
            }
        }
    }

    closesocket(msg_soc);
    WSACleanup();
    //}
  
}

1、为什么这个函数执行了两次也就是发送数据两次 hello(); 我想执行一次发送数据然后再去接收数据。