C++ MFC server app with sockets crashes and I cannot find the fault, help!
- by usermeister
My program has one dialog and two sockets. Both sockets are derived from CAsyncSocket, one is for listening, other is for receiving data from client. My program crashes when client tries to connect to server application and server needs to initialize receiving socket.
This is my MFC dialog class.
class CFileTransferServerDlg : public CDialog
{
...
ListeningSocket ListenSock;
ReceivingSocket* RecvSock;
void OnAccept(); // called when ListenSock gets connection attempt
...
};
This is my derived socket class for receiving data that calls parent dialogs method when event is signaled.
class ReceivingSocket : public CAsyncSocket
{
CFileTransferServerDlg* m_pDlg; // for accessing parent dialogs controls
virtual void OnReceive(int nErrorCode);
}
ReceivingSocket::ReceivingSocket()
{
}
This is dialogs function that handles incoming connection attempt when listening socket gets event notification. This is where the crash happens.
void CFileTransferServerDlg::OnAccept()
{
RecvSock = new ReceivingSocket; /* CRASH */
}
OR
void CFileTransferServerDlg::OnAccept()
{
ReceivingSocket* tmpSock = new ReceivingSocket;
tmpSock->SetParentDlg(this);
CString message;
if( ListenSock.Accept(*tmpSock) ) /* CRASH */
{
message.LoadStringW(IDS_CLIENT_CONNECTED);
m_txtStatus.SetWindowTextW(message);
RecvSock = tmpSock;
}
}
My program crashes when I try to create a socket for receiving file sent from client application. OnAccept starts when Listening socket signals incoming connection attempt, but my application then crashes. I've tried running it on another computer and connection attempt was succesful. What could be wrong?
Error in debug mode:
Unhandled exception at 0x009c30e1 in FileTransferServer.exe: 0xC0000005: Access violation reading location 0xccccce58.
