Build a backend server: client

Part of the protocol request specified in the previous article:

Request

Username/password, the contract username and password each accounted for 32 bytes (the same as the lowest 0)

The client's logic can be designed to:

1. Package the Username,password into the buffer

2. Connect the service side

3. Send Buffer

4. Current time of receiving binary system

5. Show time

The code is as follows:

Service-Side Address Setup section:

addr_server.sin_family = af_inet;  
Addr_server.sin_port = htons (port);  
ADDR_SERVER.SIN_ADDR.S_ADDR = inet_addr (IP);

To create a connection:

Sock_client = 

socket (af_inet, sock_stream, 0);

To connect the service-side code:

Flag = Connect ( 

sock_client, (struct sockaddr*) &addr_server, sizeof (Addr_server));

To set the buffer fill Username/password code:

sprintf (buffer, "%s", "username");  
sprintf (buffer +, "%s", "password");  
      
BUFFER[31]=BUFFER[63] = 0;

Next is send:

Flag = Send (sock_client, buffer, 

0);  
if (flag = =)  
{     
      printf ("Send ok\n");   
}

Receive part of code:

Flag = recv (sock_client, buffer, 0);  
if (flag!= sizeof (time_t))  
{  
       printf ("recv does not follow protocal\n");  
       Close (sock_client);  
       Continue;  
}

Converts the received binary data to a time

memcpy (curtime, buffer, sizeof (time_t) 

);  
struct TM *ptm = localtime (curtime);

Show Time:

printf ("System time:%

04d-%02d-%02d-%02d:%02d:%02d\n", Ptm->tm_year + 1900, Ptm->tm_mon + 1, ptm->tm_ Mday,  
        ptm->tm_hour, Ptm->tm_min, ptm->tm_sec);

Close connection:

printf ("Ok,now We close connection\n");  
Close (sock_client);

In the actual development, in order to pursue concurrent efficiency and enhance the effect of pressure, the client needs to have a loop, in addition to the simultaneous operation of multiple processes.

In the actual test, I found that the client's single process concurrent volume of about 10,000, so open a few more programs, already can meet the demand.

Detailed Code Download address:

Download Address: http://download.csdn.net/detail/xiaofei_hah0000/5205711

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/Servers/zs/