Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "what is the socket encapsulation method of C++". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Configure the pro file under QT

TEMPLATE = app

CONFIG + = console

CONFIG-= app_bundle

CONFIG-= qt

LIBS + =-lWs2_32 # # Mark using Ws2_32.lib,-l under window to indicate that you want to link to the following libraries

#-lWs2_32,link Ws2_32.lib

SOURCES + = main.cpp\

Udp.cpp

Include (deployment.pri)

QtcAddDeployment ()

HEADERS + =\

Udp.h

two。 Write udp.h files

# ifndef UDP_H

# define UDP_H

# ifdef MYLINUX

# include

# include

# include / * See NOTES * /

# include

# define SOCKET int

# else

# include

# endif

Class myudp

{

Private:

The inner members of the SOCKET st;// class are generally not exposed.

Public:

Myudp ()

~ myudp ()

Int socket_send (const char * IP,const char * buf, int len)

Int socket_recv (char * buf, int len, char * srcIP)

Int socket_bind (short int port)

}

# endif / / UDP_H

3. Write udp.cpp

# include

# include

# include "udp.h"

/ / # define MYLINUX-definition of makefile file under linux-DMYLINUX

Int myudp::socket_send (const char * IP,const char * buf, int len)

{

St = socket (AF_INET, SOCK_DGRAM, 0)

/ / create a socket. The first parameter is to specify which protocol to use for socket. AF_INET stands for using TCP/IP protocol.

/ / the second parameter SOCK_DGRAM means to use the UDP protocol

/ / the third parameter is generally 0 by default.

Struct sockaddr_in addr

Memset (& addr, 0, sizeof (addr)); / / initialize the structure addr

Addr.sin_family = AF_INET;// represents the address of a TCP/IP to be used

Addr.sin_port = htons (8080); / / host to net short

Addr.sin_addr.s_addr = inet_addr (IP)

/ / IP address resolution

/ / unsigned long laddr = inet_addr ("192.168.6.200")

/ / unsigned char * p = & laddr

/ / printf ("% u,% u\ n", * (p), * (packs 1), * (packs 2), * (packs 3))

Size_t rc = 0

/ / send udp data

Rc = sendto (st,buf,len,0, (struct sockaddr *) & addr,sizeof (addr))

Return rc

}

Int myudp::socket_recv (char * buf, int len, char * srcIP)

{

Struct sockaddr_in sendaddr;// comes from the sender's IP address

Memset (& sendaddr,0,sizeof (sendaddr))

# ifdef MYLINUX

Socklen_t len

# else

Int addrlen

# endif

Addrlen = sizeof (sendaddr)

Memset (buf,0,len)

Size_t rc = recvfrom (st,buf,len,0, (struct sockaddr *) & sendaddr,&addrlen)

/ / inet_ntoa (sendaddr.sin_addr); / / this function is non-reentrant

/ / multithreaded call, this function will have a problem

If (srcIP)

Strcpy (srcIP,inet_ntoa (sendaddr.sin_addr))

/ / printf ("% s:\ n% s\ n", srcIP, buf)

Return rc

}

Myudp::myudp ()

{

# ifndef MYLINUX

/ / initialize socket

DWORD ver

WSADATA wsaData

Ver = MAKEWORD (1J1); / / when calling WASStartup, I want to tell windows what version of socket I use

WSAStartup (ver, & wsaData); / / windows requires that as long as you use socket, the first step is to call this function.

/ / initialization completed

# endif

St = socket (AF_INET,SOCK_DGRAM,0); / / define a socket

}

Myudp::~myudp ()

{

# ifdef MYLINUX

Close (st)

# else

Closesocket (st); / / close socket

WSACleanup (); / / release related resources within win socket

# endif

}

Int myudp::socket_bind (short port)

{

Struct sockaddr_in addr

Memset (& addr,0,sizeof (addr)); / / initialize addr

Addr.sin_family = AF_INET;// represents the address of a TCP/IP to be used

Addr.sin_port = htons (port)

Addr.sin_addr.s_addr = htonl (INADDR_ANY); / / as the receiver, I do not need to specify a specific IP address. I will accept data at whatever IP the host is accepted.

/ / addr.sin_addr.s_addr = inet_addr ("192.168.2.100")

Return bind (st, (struct sockaddr *) & addr, sizeof (addr)); / / bind the port number to the program

}

The implementation code of 4.main.c

# include

# include "udp.h"

Using namespace std

Int main (int argc, char * args [])

{

If (argc > 1)

{

Myudp udp

Char buf [1024] = {0}

While (1)

{

Memset (buf, 0, sizeof (buf))

Gets (buf)

Udp.socket_send (args [1], buf, strlen (buf))

If (strcmp (buf, "exit") = = 0)

Break

}

} else

{

Myudp udp

Char buf [1024] = {0}

If (udp.socket_bind (8080) >-1)

{

Char ip [100] = {0}

While (1)

{

Memset (buf, 0, sizeof (buf))

Memset (ip, 0, sizeof (ip))

Udp.socket_recv (buf,sizeof (buf), ip)

If (strncmp (buf, "exit", 4) = = 0)

Break

Cout

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