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Remote Control PCs

, 20 Sep 2013
Two projects that work together to remote control PCs across a LAN.
// Remote Desktop System - remote controlling of multiple PC's
// Copyright (C) 2000-2009 GravyLabs LLC

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#pragma once

#include <set>
#include "afxsock.h"
#include "Packet.h"
#include "Common.h"

#define WM_ACCEPTCONN (WM_APP + 1)
#define WM_MAKECONN (WM_APP + 2)
#define WM_RECEIVEDATA (WM_APP + 3)
#define WM_CLOSECONN (WM_APP + 4)

// TCP stream socket class
class CTCPSocket : public CAsyncSocket
{
	typedef CAsyncSocket baseclass;
private:
	CTCPSocket(const CTCPSocket & rhs); // no
	void operator=(const CTCPSocket & rhs); // no

public:
	CTCPSocket();
	virtual ~CTCPSocket();

	BOOL Create(int nSocketPort = 0);
	BOOL Connect(LPCTSTR lpszHostAddress,UINT nHostPort);
	void SetParent(HWND hWndParent);
	BOOL ShutDown(int nHow = CSocket::both);
	BOOL InitTP();

	// Helper to send a packet
	CTCPSocket & operator << (CPacket & rhs);

	// Helper to receive a packet
	CTCPSocket & operator >> (CPacket & rhs);

	// Helper for sorting
	bool operator < (const CTCPSocket & rhs);

protected:
	// Low-level socket event callbacks, reposted to parent via WM_APP messages
	virtual void OnAccept(int nErrorCode);
	virtual void OnConnect(int nErrorCode);
	virtual void OnReceive(int nErrorCode);
	virtual void OnClose(int nErrorCode);

	// Low-level methods to send and receieve data over the socket
	virtual int Send(const void * lpBuf,int nBufLen,int nFlags = 0);
	virtual int Receive(void * lpBuf,int nBufLen,int nFlags = 0);

private:
	LPFN_TRANSMITPACKETS TransmitPackets;
	BOOL m_bListening;
	HWND m_hWndParent;
};

////////////////////////////////////////////////////////////////////////////
// Window sink message class
class CSocketWndSink : public CWnd
{
// Construction
public:
	CSocketWndSink(HWND hWndParent = NULL);
	~CSocketWndSink();

	void Connect(CString csIp,CString csPort);
	BOOL IsConnected();
	void ShutDown();

// Generated message map functions
protected:
	//{{AFX_MSG(CSocketWndSink)
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnPaint();
	//}}AFX_MSG

protected:
	// The parent dialog
	HWND m_hWndParent;

	// The client connectiun
	CTCPSocket m_Socket;
	BOOL m_bConnected;

	DECLARE_MESSAGE_MAP()

	// Handled socket event callbacks
	afx_msg LRESULT OnMakeConn(WPARAM wParam,LPARAM lParam);
	afx_msg LRESULT OnReceiveData(WPARAM wParam,LPARAM lParam);
	afx_msg LRESULT OnCloseConn(WPARAM wParam,LPARAM lParam);
};

// Connection to the server that receives DIB updates
class CSocketWndSinkThread : public CWinThread
{
	DECLARE_DYNCREATE(CSocketWndSinkThread)

	CSocketWndSinkThread();

public:
	CSocketWndSinkThread(HANDLE * phWork,HWND hWndParent,CString csIp,CString csPort);
	virtual ~CSocketWndSinkThread();
	virtual BOOL InitInstance();
	virtual BOOL PumpMessage();
	virtual int ExitInstance();
	BOOL IsConnected();

// Event synchronization
public:
	HANDLE m_hPumpMessage;

// Intialization
private:
	bool m_bPumpMessage;

protected:
	HANDLE * m_phWork;
	HWND m_hWndParent;
	CString m_csIp;
	CString m_csPort;
	CSocketWndSink * m_pSocketWnd;

protected:
	DECLARE_MESSAGE_MAP()
	afx_msg void OnConnectServer(WPARAM wParam,LPARAM lParam);
	afx_msg void OnEndThread(WPARAM wParam,LPARAM lParam);
};

////////////////////////////////////////////////////////////////////////////
// Socket message event sink
class CSocketEvent : public CWnd
{
// Construction
public:
	CSocketEvent(CWinThread * pThread);
	~CSocketEvent();
	BOOL IsClosed();

// Generated message map functions
protected:
	//{{AFX_MSG(CSocketEvent)
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnPaint();
	//}}AFX_MSG

protected:

	DECLARE_MESSAGE_MAP()

	// Socket events
	afx_msg LRESULT OnReceiveData(WPARAM wParam,LPARAM lParam);
	afx_msg LRESULT OnCloseConn(WPARAM wParam,LPARAM lParam);

	// Back pointers
	CWinThread * m_pThread;
	BOOL m_bClosed;
};

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License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

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About the Author

Andy Bantly
Founder
United States United States
Working as a software developer since 1989. Started out with Basic, FORTRAN and JCL, moved into Visual Basic 1.0, C, then C++, and now I work mainly in C++ using MFC, Win32, and ATL/COM. I use Microsoft Products only because that is what gives me gainful employment. Through work, I have a lot of experience with HTML, JavaScript, XSL transformations, the XMLHTTP object, PHP 4.x, and simple COM object integrations.
 
I've worked for the University of Oklahoma in the school of meteorology (Go SOONERS!), consulting, and now as a Senior Software Engineer. These things keep my lights on and electricity going. My dream job is to own a bowling alley and rub elbows with pro-bowlers! I'm also an avid pedicab driver and have my own cab. I like the hustle of picking up people in downtown and biking them to their destination.
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