I have written a server program in C++ and also a client program in C++. Both are working fine but when if one client is communicating with the server then other client can't get connected to the same server. If suppose when I close the client 1 then also my 2nd client can't connect to the server. I have started my Server with multiple threads to connect to multiple clients but only one client is connecting.
MY server Program:
#include <iostream>
#include <winsock2.h>
#include <Windows.h>
#include <process.h>
#include <thread>
#pragma comment(lib,"ws2_32.lib")
static const int num_of_threads = 2;
void client_disconnected(SOCKET Socket);
void start_server()
{
WSADATA WsaDat;
if(WSAStartup(MAKEWORD(2,2),&WsaDat)!=0)
{
std::cout<<"WSA Initialization failed!\r\n";
WSACleanup();
system("PAUSE");
}
SOCKET Socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(Socket==INVALID_SOCKET)
{
std::cout<<"Socket creation failed.\r\n";
WSACleanup();
system("PAUSE");
}
SOCKADDR_IN serverInf;
serverInf.sin_family=AF_INET;
serverInf.sin_addr.s_addr=INADDR_ANY;
serverInf.sin_port=htons(8888);
if(bind(Socket,(SOCKADDR*)(&serverInf),sizeof(serverInf))==SOCKET_ERROR)
{
std::cout<<"Unable to bind socket!\r\n";
WSACleanup();
system("PAUSE");
}
listen(Socket,3);
SOCKET TempSock=SOCKET_ERROR;
while(TempSock==SOCKET_ERROR)
{
std::cout<<"Waiting for incoming connections...\r\n";
Sleep(5000);
TempSock=accept(Socket,NULL,NULL);
}
// If iMode!=0, non-blocking mode is enabled.
u_long iMode=1;
ioctlsocket(Socket,FIONBIO,&iMode);
Socket=TempSock;
std::cout<<"Client connected!\r\n\r\n";
// Main loop
for(;;)
{
int nError=WSAGetLastError();
if(nError!=WSAEWOULDBLOCK&&nError!=0)
{
client_disconnected(Socket);
break;
}
char *szMessage="Welcome to the server!\r\n";
send(Socket,szMessage,strlen(szMessage),0);
Sleep(2000);
}
}
void client_disconnected(SOCKET Socket)
{
std::cout<<"Client disconnected!\r\n";
// Shutdown our socket
shutdown(Socket,SD_SEND);
// Close our socket entirely
closesocket(Socket);
WSACleanup();
}
int main()
{
//starting multiple threads for invoking server
std::thread threads[num_of_threads];
//This statement will launch multiple threads in loop
for (int i = 0; i < num_of_threads; ++i) {
threads[i] = std::thread(start_server);
Sleep(2000);
}
for (int i = 0; i < num_of_threads; ++i) {
threads[i].join();
}
return 0;
}
My Client Program:
#include <iostream>
#include <winsock2.h>
#include <Windows.h>
#include <process.h>
#include "client.h"
#pragma comment(lib,"ws2_32.lib")
void MultipleClient :: receiveToClient(void*data)
{
WSADATA WsaDat;
if(WSAStartup(MAKEWORD(2,2),&WsaDat)!=0)
{
std::cout<<"Winsock error - Winsock initialization failed\r\n";
WSACleanup();
system("PAUSE");
}
// Create our socket
SOCKET Socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(Socket==INVALID_SOCKET)
{
std::cout<<"Winsock error - Socket creation Failed!\r\n";
WSACleanup();
system("PAUSE");
}
// Resolve IP address for hostname
struct hostent *host;
if((host=gethostbyname("localhost"))==NULL)
{
std::cout<<"Failed to resolve hostname.\r\n";
WSACleanup();
system("PAUSE");
}
// Setup our socket address structure
SOCKADDR_IN SockAddr;
SockAddr.sin_port=htons(8888);
SockAddr.sin_family=AF_INET;
SockAddr.sin_addr.s_addr=*((unsigned long*)host->h_addr);
// Attempt to connect to server
if(connect(Socket,(SOCKADDR*)(&SockAddr),sizeof(SockAddr))!=0)
{
std::cout<<"Failed to establish connection with server\r\n";
WSACleanup();
system("PAUSE");
}
// If iMode!=0, non-blocking mode is enabled.
u_long iMode=1;
ioctlsocket(Socket,FIONBIO,&iMode);
// Main loop
for(;;)
{
// Display message from server
char buffer[1000];
memset(buffer,0,999);
int inDataLength=recv(Socket,buffer,1000,0);
std::cout<<buffer;
//end client when server is disconnected
int nError=WSAGetLastError();
if(nError!=WSAEWOULDBLOCK&&nError!=0)
{
std::cout<<"Winsock error code: "<<nError<<"\r\n";
std::cout<<"Server disconnected!\r\n";
// Shutdown our socket
shutdown(Socket,SD_SEND);
// Close our socket entirely
closesocket(Socket);
break;
}
Sleep(2000);
}
WSACleanup();
system("PAUSE");
}
class Client{
public:
static unsigned int __stdcall receiveMessageThread(void *p_this)
{
MultipleClient* mc = static_cast<MultipleClient*>(p_this);
mc-> receiveToClient(p_this); // Non-static member function!
return 0;
}
void startThread()
{
HANDLE myhandleA;
myhandleA = (HANDLE)_beginthreadex(0,0,&Client::receiveMessageThread,this,0, 0);
WaitForSingleObject(myhandleA, INFINITE);
}
};
int main(void)
{
Client *c = new Client;
c->startThread();
return 0;
}
Please help me how to make multiple clients to connect with a single server. A sample code will be very useful(sorry for asking).
