Re: Avoiding multiple programinstances and restore the firstone

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#6595

From: JD
Date: Tue, 26 Apr 2005 06:38

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Hans Galema <notused@notused.nl> wrote:
>
> [...]
>              ::SendMessage( hwnd, WM_SYSCOMMAND, SC_RESTORE, 0);
>              ::SetForegroundWindow( hwnd );

This code is problematic if the window is not minimized
because it will disable the Minimize border icon. Ultimately,
the problem is with Windows incorrectly recording the window
state (unless you apply WS_EX_APPWINDOW to the window's
ExStyle but then you get 2 icons on the task bar) so testing
if it's minimized is useless.

The only solution is to manually track the window state and
have the second instance send the first instance a custom
message so that the first instance can decide what to do.

This component does exactly that:

    http://newsgroups.borland.com/cgi-bin/dnewsweb?cmd=article&group=borland.public.cppbuilder.vcl.components.writing&item=19759&utag=

~ JD

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