Re: Program lockup waiting for messages

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#8200

From: Jeff
Date: Mon, 15 Nov 2004 17:48

28 lines
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Thanks, I managed to get it to work with SendMessageTimeout(). I just set a 
short timeout.

"Dennis Jones" <nospam@bogus.com> wrote in message 
news:4198e62f@newsgroups.borland.com...
>
> "Jeff" <Jeff@nospam.com> wrote in message
> news:4198d752$1@newsgroups.borland.com...
>> Sure, here is one message being sent:
>> void __fastcall TfrmMain::btnStartClick(TObject *Sender)
>> {
>>     SendMessage(WinHandle, WM_STARTSCRIPT, 0, 0);
>> }
>
> There's your problem(s).
>
> 1. SendMessage() doesn't return until the message has been handled.
> 2. VCL event handlers (like your button click handler) are handled in the
> main VCL thread, and if an event handler blocks, everything grinds to a
> halt.
>
> You will probably want to create a separate thread that sends the message
> and waits for the reply.  Or, alternatively, if your app does not have to
> wait until the caller is done before continuing, use PostMessage instead.
>
> - Dennis
>
>

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Subject: Re: Program lockup waiting for messages
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