Re: Advice for Skybuck project.

Advice for Skystuck: stop giving adive...

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Skybuck Flying schreef:
> 1. Do not use exceptions to indicate failures of load library for
dynamic 
> linking of routines.
> 2. Do not use exceptions to indicate failures of get proc address for 
> dynamic linking of routines.
> 
> Also:
> 
> 3. Do not rely on the compiler to initialize the pointers to nil.
> 
> Bad usage example:
> 
> try
>     NewRoutine( ... );
> except
>     on WackyJWAExceptionCrapWhichIsIrrelevantForWinAPI do
>     begin
>         try
>             OldRoutine( ... );
>         except
>             // More crap goes here.
>         end;
> 
>     end;
> end;
> 
> ^^^ Generated instructions overhead is quite large = slow.
> 
> Instead:
> 
> 3. Initialize the pointers to nil explicitly via code.
> 2. Pointers will remain nil if get proc address failed.
> 1. Library pointer will remain nil if load library failed (?).
> 
> Better usage example:
> 
> if Assigned(NewRoutine) then
> begin
>     NewRoutine( ... );
> end else
> begin
>     if Assigned(OldRoutine) then
>     begin
>         OldRoutine( ... );
>     end;
> end;
> 
> ^^^ Nice and sleak, low overhead.
> 
> Finally if user really wants to know if a certain library was loaded 
> possible use the library handle:
> 
> If Assigned(SomeLibraryHandle) then
> begin
>     // writeln library was loaded
> end;
> 
> If dynamic link off then maybe set this too:
> 
> SomeLibraryHandle := -1; to indicate it was loaded.
> 
> Bye,
>   Skybuck. 
> 
>