Re: passing this object

From:

"Jung, William" <aopiyy001@yahoo.com>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 27 Nov 2008 03:25:49 -0800

Message-ID:

<6t0ti4hokqq121lnhhh5aohc5mu79lkdr2@4ax.com>

On Thu, 27 Nov 2008 06:19:52 -0500, David Wilkinson
<no-reply@effisols.com> wrote:

Jung, William wrote:

I would like to pass "this" object to a constructor of socket class -
Sock which extends CSocketComm.

Once the socket class processed the data, the socket class use the
reference of CVirtualScreen (this object) - screen.setMessage function
to pass back the message to CVirtualScreen.

Is the following a correct syntax of implementing it?

should I involve reference / pointer in this case?

Please advice the incorrect area of the following code.

===================
class CVirtualScreen
{
public:
    CVirtualScreen();
    ~CVirtualScreen();
    Sock *sock;
}
===================
CVirtualScreen::CVirtualScreen()
{
    // QUESTION ///////////////////////////
    // IS IT CORRECT WAY OF PASSING
    // THIS OBJECT TO SOCKET CLASS??
    // SHOULD I USE & REFERENCE??
    // SHOULD I USE POINTER??
    sock = new Sock(this);
}

// function must take std::string as parameter
CVirtualScreen::setMessage( std::string message )
{
    //setMessage to queue
}
===================
class Sock : public CSocketComm
{
public:
Sock(CVirtualScreen screen);
~Sock();

// QUESTION ///////////////////////////
// DO I DECLARE REFERENCE TO CVirtuaqlScreen LIKE THIS WAY??
CVirtuaqlScreen screen;

virtual void OnDataReceived(const LPBYTE lpBuffer, DWORD dwCount);
bool StartServer();

};
===================
Sock::Sock(CVirtualScreen screen)
{
    // QUESTION ///////////////////////////
    // CAN I SET REFERENCE TO CVirtualScreen LIKE THIS??
    // SHOULD I USE POINTER??
    screenObject = screen
    StartServer();
}
Sock::~Sock()
{
    StopComm();
}
void Sock::OnDataReceived(const LPBYTE lpBuffer, DWORD dwCount)
{
    // do some stuff and output the std::string object
    std::string message = ... etc
    // QUESTION ///////////////////////////
    // ONCE SOCKET PROCESSED THE MESSAGE AND EXTRACT THE DATA
    // SOCKET WILL PASS THE MESSAGE BACK TO CVirtualScreen TO
    // INSERT MESSAGE INTO A MESSAGE QUEUE
    // IS THE FOLLOWING COORECT SYNTAX TO PASS MESSAGE BACK TO
    // CVirtualScreen CLASS??
    screen.setMessage ( message );
}

William:

A question like this can most easily be answered by trying to compile your code.
Your code will generate a number of errors.

You should use a pointer member variable CVirtualScreen* in your Sock class, and
pass your "this" object to it as a CVirtualScreen*.

I would advise you to get a much better grasp of C++ before you try to use it
for socket programming.

I used a pointer syntax but I am still getting error
http://www.oniva.com/upload/1356/e.jpg

any idea what's wrong here?

the line of
    void Create1(CVirtualScreen *Vscreen);
AND
    CVirtualScreen *Vscreen;

is having problem

===============
Sock::Sock()
{
    StartServer();
}

void Sock::Create1(CVirtualScreen *screen)
{
    Vscreen = screen;
}

Sock::~Sock()
{
    StopComm();
}
===============
class Sock : public CSocketComm
{
public:
    Sock();
    ~Sock();
    void Create1(CVirtualScreen *Vscreen);
    CVirtualScreen *Vscreen;

};