C / C++ / MFC

Matt Godbolt wrote:

If you're just trying to allow one connection in, denying all others after a successful connection, then you can close the listening socket after accept()ing.

If you really need to give a 'connection refused' message to a subset of people, you should consider using a firewall instead.

// Create a listening socket.
SOCKET listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
// Bind to local address (NB the localAddress is not initialised here; it's of type struct sockaddr*)
bind(listenSocket, localAddress);

// Start listening on this socket.  NB Passing a backlog of 1 here doesn't limit the number of connections to one.
listen(listenSocket, 1);

// Accept a connection
sockaddr_in connectingAddress;
int connectingAddressSize = sizeof(connectingAddress);
SOCKET incomingConnection = accept(listenSocket, &connectingAddress, &connectingAddressSize);

// We now have a socket 'incomingConnection' which we can read and write to to talk to the incoming connection.
// It's now safe to close the listening socket - effectively closing the port to any further connections.
closesocket(listenSocket);

// ...read and write to incomingConnection...

closesocket(incomingConnection);

CFile file;
if(file.Open("source.gif",CFile::modeRead|CFile::typeBinary))
int nLength = file.GetLength();

if(nLength >0)
{
byte* pBuffer = new byte[nLength];
file.Read(pBuffer,nLength);

CFile fileWrite;
if(fileWrite.Open("destination.gif",CFile::modeCreate|CFile::modeWrite|CFile::typeBinary);
   fileWrite.Read(pBuffer,nLength);
fileWrite.Close();
}

file.Close();
}

ifstream is( "myFile.gif", ios::binary );
char Data;
if( !is ) {
    cerr << "Error opening file" << endl;
	return false;
	}
	else
		printf("file opened successfully");

	while( is.read( (char*) &Data, sizeof(char) ) ) {
	//Do whatever you like
	}

Uday Janaswamy wrote:

From CDialog i have to Show a CFormView. How we can achieve this.