Re: [BLACKBOX] Program freezes when window loses focus

From: [at]} <Chris>
Date: Tue, 29 Mar 2011 08:31:16 +1030

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>-----Original Message-----
>From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
>Rex Couture
>Sent: Tuesday, 29 March 2011 4:53 AM
>To: BLACKBOX{([at]})nowhere.xy
>Subject: Re: [BLACKBOX] Program freezes when window loses focus
>
> BlackBox also has a ReadKey method that might be
>applicable. I assume the application is not really freezing,
>and it should respond to keystrokes -- right?
>

Wrong. The problem is related to the way the "Windows Message Queue" is
handled. For a description of how this operates see:

http://msdn.microsoft.com/en-us/library/ms644928(v=vs.85).aspx

The problem is highlighted in the section with the heading "Examining the
Message Queue":

"Unless your application periodically examines the message queue during the
operation for mouse and keyboard messages, it will not respond to user input
until after the operation has completed."

Regards,
Chris Burrows

CFB Software
http://www.cfbsoftware.com
 

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Received on Tue Mar 29 2011 - 00:01:16 UTC