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Article #6736

Re: custom VCL exceptions, how?

#6736
From: Francisco M. Marzoa
Date: Mon, 18 Apr 2005 16:19
55 lines
2555 bytes
I think I've got it, thanks a lot again, Jonathan.

Jonathan Benedicto wrote:
> "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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Date: Mon, 18 Apr 2005 18:19:02 +0200
From: "Francisco M. Marzoa" <fmmarzoa@softronica.org>
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Subject: Re: custom VCL exceptions, how?
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