[DUG] Usage - initialization and finalization

[Alister Christie]

I was reading Mastering Delphi 2005 the other day (I'm working my way 
through it - from what I understand there arn't any good D2006 books as 
yet).  Anyway there was a discussion on how initialize and finalize 
operate under .Net.  Given the very non-object orientatedness of 
initialize and finalize it's pretty impressive how the Borland (DevCo) 
team were able to get so much of the Delphi functionality into .Net.  I 
say this not having written a Delphi.net app however.

I've certainly learnt quite a bit from reading it as I've gone from D6/7 
-> D2006 (even though I'm less than a third of the way through it).

Alister

Paul A Norman wrote:
> Point of interest - something basic for me and possibly others to learn.
>  
> I've only ever used unit 'initialization and finalization' "blindly" 
> since Delphi 3 days for Activex / OLE type stuff, as just someting 
> that you have to do - without understanding.
>  
> initialization
>   OleInitialize(nil);
>  
> finalization
>   OleUninitialize;
>  
> Otherwise I've used the *onFormComplete* and *onDestroy* to set intial 
> stuff up and then release stuff.
>  
> But I am guessing that *Finailization* is a better place to release 
> stuff (*help avoid memoery leakage under certain circumstances*?), but 
> *Initialization* would have to be used for *Finalization* to be 
> acceptable..
>  
> I've read the Delphi 2005 help and googled a bit, but am not yet sure 
> just what sorts of code can be put in the Initialization and Finalization.
>
>    1. Can anything declared as a unit *VAR* or *CONST* be dealt with
>       or used in Initialization ? it appears so to me from what I see
>       (below).
>    2. Could I safely .*create* and .*free* objects respectively?
>
> I  was reading through a *Unit* the other day and saw all sorts of 
> things in *Initialization*  there that surprised me.
>  
> Can any one please point me to a good reference on this, or in our new 
> learning sharing attitude, explain it for every ones benefit here?
>  
> initialization
>   FillChar(BrowserData,SizeOf(BrowserData),#0);
>   OleInitialize(nil);
>   New(PtrWGUID);
>   New(PtrMGUID);
>   New(PtrDGUID);
>   PtrWGUID^:=CGID_WebBrowser;
>   PtrMGUID^:=CGID_MSHTML;
>   PtrDGuid:=PGUID(nil);
>   GetBrowserData(BrowserData);
>   IEStr:=IEVerStr;
>   OnMessageCompNo:=0;
>
> finalization
>   Dispose(PtrWGUID);
>   Dispose(PtrMGUID);
>   Dispose(PtrDGUID);
>   OleUninitialize;
>
> end.
>  
>  
>  
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-- 
Alister Christie
Computers for People
Ph: 04 471 1849 Fax: 04 471 1266
http://www.salespartner.co.nz
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Wellington