Re: custom VCL exceptions, how?

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#6737

From: Jonathan Benedicto
Date: Mon, 18 Apr 2005 16:17

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"Francisco M. Marzoa" <fmmarzoa@softronica.org> wrote in message 
news:4263da98@newsgroups.borland.com...
> It compiles fine, thanks a million. BTW, now it says that a return 
> statement that I've just after throw the extension is an 
> "Unreachable code". Do you know why?

You can remove that return. I hope I can explain this.

VCL apps are built like this : (much-simplified)

WinMain
{
    try
    {
        YourApplication
        {
            // if your code throws an exception, that does not have
            // a try / catch block around it somewhere, then the
            // exception gets caught back here in WinMain.
        }
    }
    catch()
    {
        HandleException
    }
}

So, you don't need that return because your methods will just stop 
executing, and the app will "hop" to the "nearest" try / catch block. 
By nearest, I mean like this:

try    // Then this one.
{
    try    // This is the nearest
    {
        throw Exception("...");
    }
}

try    // Not this one.
{
    OtherCode();
}

I've tried to explain it clearly, but I hope that you can follow it.

Jonathan

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Subject: Re: custom VCL exceptions, how?
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