dev-cpp-users

Re: [Dev-C++] Object passing itself

[Daniel G. <sp...@ho...>]

Ah, but Obj has two data members, which are a text string (which details the 
precise error) and an integer (which is the error code). SetErrorLog() 
outputs this information to a text file.

I suppose one way would be to make a copy of Obj (Obj2) and then pass obj
so
Obj2.SetErrorLog( Obj );


>From: "Abhijit Shylanath" <mu...@gm...>
>To: "Daniel Glenfield" 
><sp...@ho...>,<dev...@li...>
>Subject: Re: [Dev-C++] Object passing itself
>Date: Tue, 30 Jul 2002 22:16:20 +0530
>
>It seems it should work (though I haven't tried it)... though it beats me
>why you should pass in an exception object to an exception method... it
>defeats the purpose of OOP, that of every object being self-contained. It
>should, I feel, be
>
>Exception::SetErrorLog();
>
>--------------------------
>"I'm not as thunk as you drink I am."
>--------------------------
>Checked with NAV 2002
>http://mudeth.tripod.com
>
>----- Original Message -----
>From: "Daniel Glenfield" <sp...@ho...>
>To: <dev...@li...>
>Sent: Tuesday, July 30, 2002 6:58 PM
>Subject: [Dev-C++] Object passing itself
>
>
> > Can an object pass itself into the function it is calling?
> >
> > void DevModeDlg::OnSysCommand( UINT ID, LPARAM LParameter )
> > {
> >   try
> >   {
> >      DoOnSysCommandWork();
> >   }
> >   catch ( Exception &Obj )
> >   {
> >      Obj.SetErrorLog( &Obj )           // <--- Here
> >   }
> >
> > }
> >
> >
> > where SetErrorLog
> >
> > void Exception::SetErrorLog( Exception &Obj )
> > {
> >    //... create a text file and put in data contained in Obj.
> > }
> >
> > I tried 'this' but b/c I'm inside another class' function it tries to 
>pass
> > that object (DevModeDlg)




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Re: [Dev-C++] Object passing itself

[Daniel G. <sp...@ho...>]

A little of the code:

// A CLASS CONSTRUCTOR
AddPrinterDialog::AddPrinterDialog()
{
    mAddPrinterDialogPointer = NULL;
    mPointerToParent = NULL;

    /* If this pointer has failed to be assigned as specified then
       construction has failed (object cannot, and therefore never
       has, existed.
    */
    if ( mAddPrinterDialogPointer != NULL )
    {
        Exception ThrownObject( "AddPrinterDialog construction failed.", 31 
); // Error code 31
        throw ThrownObject;
    }
    else
    {
        ; // Do nothing
    }
}

Of course this thrown exception would be caught etc. and SetErrorLog would 
be called (below).


void Exception::SetErrorLog( Exception &Obj )
{
    ofstream ExceptionOfstreamObject; // For managing the text file

    // Create and name the text file
    ExceptionOfstreamObject.open( _T("Exception Caught Log.txt") );
    ExceptionOfstreamObject << Obj.GetErrorString() << endl;
    ExceptionOfstreamObject << Obj.GetErrorCode() << endl;

    ExceptionOfstreamObject.close();
}

That's the cuurent code. You can see why I want the obj to pass itself. I 
have a workaround, I just wondered if it was possible.


>From: "Abhijit Shylanath" <mu...@gm...>
>To: "Daniel Glenfield" 
><sp...@ho...>,<dev...@li...>
>Subject: Re: [Dev-C++] Object passing itself
>Date: Wed, 31 Jul 2002 02:49:47 +0530
>
> > Ah, but Obj has two data members, which are a text string (which details
>the
> > precise error) and an integer (which is the error code). SetErrorLog()
> > outputs this information to a text file.
>
>I still don't get it... won't this do?
>
>void Exception::SetErrorLog()
>{
>     ofstream f("log.txt");
>     f << text_string << endl;
>     f << "Error-code " << err_code << endl;
>}
>
>
>
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Re: [Dev-C++] Object passing itself

[Abhijit S. <mu...@gm...>]

> Ah, but Obj has two data members, which are a text string (which details
the
> precise error) and an integer (which is the error code). SetErrorLog()
> outputs this information to a text file.

I still don't get it... won't this do?

void Exception::SetErrorLog()
{
    ofstream f("log.txt");
    f << text_string << endl;
    f << "Error-code " << err_code << endl;
}