Tamas Rudnai wrote:


> Hi Vitality,

My name really is "Vitaliy", without the "t" -- it's not a typo. ;-)

> Unfortunately I have no Delhpi on my computer, just downloaded the source
> code for TurboPower Async Pro library and had a quick glance on
> IsPortAvailable function. Do you know exactly which line causes the error?
> Is that possible that TApdWin32Dispatcher.Create fails so that DeviceLayer
> remains nil therefore when it it throws an exception DeviceLayer.Free will
> hangs your app? If yes the obvious solution is to check if that 
> DeviceLayer
> is nil or not before referencing to it. If that Create function does not
> throws an exception but leaves DeviceLayer nil when fails then it is 
> another
> issue so check that value before using it.
>
> If the error is somewhere else just delete my mail :-)

There was no error. The program would simply stop responding. However, after 
some fiddling I found that the program will eventually unfreeze (it takes 
about 4 minutes per port).

A colleague pointed out that HyperTerminal enumerates the ports instantly, 
so I ran the process monotor (mentioned a few days earlier on this list), 
and found that HT grabs the list directly from the Registry. Now I'm doing 
the same, and the enumeration problem is gone.

I would like to find a solution for being able to not "hang" the program 
when I actually open a BT port for writing.

VItaliy 

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