El 27/3/23 a les 11:06, Sven Barth via lazarus ha escrit:
Luca Olivetti via lazarus <lazarus@lists.lazarus-ide.org
<mailto:lazarus@lists.lazarus-ide.org>> schrieb am Mo., 27. März 2023,
10:34:
El 27/3/23 a les 10:13, Jean SUZINEAU via lazarus ha escrit:
>
> Le 27/03/2023 à 09:46, Luca Olivetti via lazarus a écrit :
>> procedure TUpdateThread.Execute;
>> begin
>> while not Terminated do
>> begin
>> FWaitForm.ShowProgress;
>> Sleep(30);
>> end;
>> end;
>
> Usually I use TThread.Synchronize to ensure that the graphic code
is run
> by the main thread.
>
> But it won't work if your main thread is blocking.
Exactly
>
> May be you should do the inverse move the lengthy operation to a
> separate thread and keep the main thread for the splash screen ?
Yes, I usually do that, but in this case it's not possible (the lengthy
operation is just a TSQLQuery.open that I cannot delegate to a
different thread).
You need to find a way then, because the GUI handling *must* be done in
the main thread.
Opening the query in a thread[*] seems to have no ill effects, so that's
what I'm doing now.
[*] instead of opening the query I spawn a thread that opens it, wait
for it to finish while executing Application.ProcessMessages and
eventually reraise the exception that was generated inside the thread.
Bye
--
Luca Olivetti
Wetron Automation Technology http://www.wetron.es/
Tel. +34 93 5883004 (Ext.3010) Fax +34 93 5883007
--
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