Linux under Qt+googleprotobuf+socket

When I was ready to graduate recently, I kept busy. Internship in the company with the elder brother and strong brother contacted Googleprotobuf, feel this thing is a good thing, but at that time, Net Dragon Company to the bottom are done, contact is directly call their good interface. I do not know the socket and other network programming, and now ready to go to Shanghai to find a job, he pondered the next.

For personal reasons, I prefer the Linux system, I chose the Linux platform Qt to do this demo. Installing things with Linux is also a lot easier.

First, let's install Googleprotobuf.

wget http://protobuf.googlecode.com/files/protobuf-your version number. tar.gz

Tar zxvf protobuf-your version number. tar.gz

CD protobuf-your version number

./configure--prefix=/usr/

Make

sudo make install

/sbin/ldconfig-v

The last command is to avoid problems with the library when you use the PROTOC command.

Now let's write a proto file named: Qtpeople.proto, which reads as follows:

Packageqtpeople;

Messagepeople

{

Required String name=1;

Required Int32 id=2;

Required String passwd=3;

}

Now we need to generate the H and CC files with the following command:

Protoc-i=. --cpp_out=./Qtpeople.proto (the parameter meaning of this command manprotoc found)

QTPeople.pb.cc

Qtpeople.pb.h

Qtpeople.proto
Now we use QT to create two new projects, named: Qtprotoc, Qtprotos, and add Libs +=-l/usr/lib-lprotobuf in the pro file,

Because this is the demo of the test, I will directly use the project generated main file, in the main file include Qtpeople.pb.h

File.

The contents of the main file of Qtprotoc are as follows:

#include <QCoreApplication>

/*

-----know how to be silent------

*/

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <iostream>

#include <QDebug>

#include "Qtpeople.pb.h"

#define MAXSIZE 1024

#define SERVERIP "127.0.0.1"

#define ServerPort 2236

#define DATA "This is guest"

using namespace Std;

void Client ()

{

int mysock,recvbytes;

string data;

Char Buf[maxsize];

struct sockaddr_in serveraddr;

Qtpeople::P eople peo;

PEO.SET_ID (1002);

Peo.set_name ("Def");

PEO.SET_PASSWD ("1234567");

Peo. Serializetostring (&data);

Char Sendmsg[maxsize];

strcpy (Sendmsg,data.c_str ());

if ((Mysock=socket (af_inet,sock_stream,0)) ==-1)

{

Qdebug () << "Sockt error";

Exit (-1);

}

Bzero (&serveraddr,sizeof (SERVERADDR));

Serveraddr.sin_family=af_inet;

Serveraddr.sin_port=htons (ServerPort);

SERVERADDR.SIN_ADDR.S_ADDR=INET_ADDR (ServerIP);

if (Connect (mysock, (struct sockaddr *) &serveraddr,sizeof (struct sockaddr)) = =-1)

{

Qdebug () << "Connect error";

Exit (-1);

}

Write (mysock,sendmsg,sizeof (sendmsg));

if ((Recvbytes=recv (mysock,buf,maxsize,0)) ==-1)

{

Qdebug () << "received error";

Exit (-1);

}

Qdebug () << "sucess";

buf[recvbytes]= ' + ';

String Getmsg=buf;

cout<<getmsg<<endl;

BOOL Isget=peo. Parsefromstring (getmsg);

Qdebug () <<isGet;

cout<< "id=" <<peo.id () <<endl;

cout<< "Name=" <<peo.name () <<endl;

cout<< "passwd=" <<peo.passwd () <<endl;

Close (Mysock);

Google::p rotobuf::shutdownprotobuflibrary ();

}

int main (int argc, char *argv[])

{

Qcoreapplication A (argc, argv);

Client ();

return A.exec ();

}

The contents of the Qtprotosmain file are as follows:

#include <QCoreApplication>

/*

-----know how to be silent------

*/

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <iostream>

#include <QDebug>

#include "Qtpeople.pb.h"

#define Servport 2236

#define BACKLOG 10

#define MAXSIZE 1024

using namespace Std;

void Server () {

int SOCKFD, CLIENT_FD;

string data;

struct sockaddr_in my_addr;

struct sockaddr_in remote_addr;

Qtpeople::P eople peo;

PEO.SET_ID (1001);

Peo.set_name ("abc");

PEO.SET_PASSWD ("7654321");

Peo. Serializetostring (&data);

Char Sendmsg[maxsize];

strcpy (Sendmsg,data.c_str ());

Creating sockets

if ((SOCKFD = socket (af_inet, sock_stream, 0)) ==-1) {

Perror ("Socket create failed!");

Exit (1);

}

Bound Port Address

my_addr.sin_family = af_inet;

My_addr.sin_port = htons (Servport);

MY_ADDR.SIN_ADDR.S_ADDR = Inaddr_any;

Bzero (& (My_addr.sin_zero), 8);

if (Bind (SOCKFD, (struct sockaddr*) &my_addr, sizeof (my_addr)) = =-1) {

Perror ("Bind error!");

Exit (1);

}

Listening port

if (Listen (SOCKFD, BACKLOG) = =-1) {

Perror ("Listen error");

Exit (1);

}

Qdebug () << "before while OK";

while (1) {

Qdebug () << "while first OK";

socklen_t sin_size = sizeof (REMOTE_ADDR);

Qdebug () << "before accept OK";

/* if ((client_fd = Accept (SOCKFD, (struct sockaddr *) &remote_addr,&sin_size)) {

Perror ("Accept error!");

Continue

}

*/

Client_fd=accept (SOCKFD, (struct sockaddr *) &remote_addr,&sin_size);

Qdebug () <<client_fd;

if (client_fd==-1)

{

Perror ("Accept error");

Continue

}

Qdebug () << "Accept OK";

CLIENT_FD = Accept (SOCKFD, (struct sockaddr *) &remote_addr,&sin_size);

printf ("Received a connection from%s\n", (char*) Inet_ntoa (REMOTE_ADDR.SIN_ADDR));

Qdebug () << "before fork OK";

Child process Segments

if (!fork ()) {

Qdebug () << "fork OK";

Accept instructions sent by the client

int rval;

Char Buf[maxsize];

if ((Rval = Read (CLIENT_FD, buf, MAXSIZE)) < 0) {

Perror ("Reading stream error!");

Continue

}

Qdebug () << "read OK";

buf[maxsize]= ' + ';

String Getmsg=buf;

BOOL Isget=peo. Parsefromstring (getmsg);

Qdebug () <<isGet;

cout<< "id=" <<peo.id () <<endl;

cout<< "Name=" <<peo.name () <<endl;

cout<< "passwd=" <<peo.passwd () <<endl;

Send a message to the client

if (Send (Client_fd,sendmsg, strlen (sendmsg), 0) = =-1)

Perror ("Send error!");

Close (CLIENT_FD);

Exit (0);

}

Close (CLIENT_FD);

}

Close (SOCKFD);

}

int main (int argc, char *argv[])

{

Qcoreapplication A (argc, argv);

Server ();

return A.exec ();

}

Linux under Qt+googleprotobuf+socket