C++ in socket programming examples
- 2020-05-24 05:57:07
- OfStack
C++, socket programming examples
There are three types of sockets programming: streaming sockets (SOCK_STREAM), datagram sockets (SOCK_DGRAM), original sockets (SOCK_RAW). socket programming based on TCP is using streaming sockets. In this program, add two projects to one workspace. To link a library file for ws2_32.lib.
Steps of server-side programming:
1: load the socket library and create the socket (WSAStartup()/socket());
2: bind the socket to an IP address and a port (bind());
3: set the socket to listen mode and wait for connection request (listen());
4: after the request arrives, accept the connection request and return a new socket corresponding to the connection (accept());
5: use the returned socket to communicate with the client (send()/recv());
6: return and wait for another connection request;
7: close the socket, close the loaded socket library (closesocket()/WSACleanup()).
The server-side code is as follows:
#include <stdio.h>
#include <Winsock2.h>
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup( );
return;
}
SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
listen(sockSrv,5);
SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);
while(1)
{
SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
char sendBuf[50];
sprintf(sendBuf,"Welcome %s to here!",inet_ntoa(addrClient.sin_addr));
send(sockConn,sendBuf,strlen(sendBuf)+1,0);
char recvBuf[50];
recv(sockConn,recvBuf,50,0);
printf("%s\n",recvBuf);
closesocket(sockConn);
}
}
Steps of client programming:
1: load the socket library and create the socket (WSAStartup()/socket());
2: make a connection request to the server (connect());
3: communicate with the server (send()/recv());
4: close the socket, close the loaded socket library (closesocket()/WSACleanup()).
The client code is as follows:
#include <stdio.h>
#include <Winsock2.h>
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup( );
return;
}
SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
send(sockClient,"hello",strlen("hello")+1,0);
char recvBuf[50];
recv(sockClient,recvBuf,50,0);
printf("%s\n",recvBuf);
closesocket(sockClient);
WSACleanup();
}
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