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{
!**************************************
! Name: Closing other applications from
! your application
! Description:RazorBlade (yes, this is a
! nickname) sent me an e-mail explaining h
! ow to close other applications from your
! Delphi application. I then digged in the
! Delphi help files to be able to give you
! some additional information.
! By: Emiel Hollander
!
!This code is copyrighted and has ! limited warranties.Please see http://w
! ww.Planet-Source-Code.com/vb/scripts/Sho
! wCode.asp?txtCodeId=52&lngWId=7 !for details. !**************************************
To close an application, you have to send the message WM_QUIT
to that
application. Messages were introduced because Windows is completely
event-driven. Messages are being sent between Windows and applications
and
between applications themselves all the time. Windows generates a
message every
time, for example, the mouse passes over one of the application's
windows.
A message identifier is a named constant that identifies the
purpose of a
message. When a window procedure receives a message, it uses a
message
identifier to determine how to process the message. For example,
the WM_QUIT
message tells the application to terminate. Search in the Win32
Programmer's
Reference for "WM_" without the quotes and you'll find all the
messages possible.
First you have to find the termination status of an application.
Most of the
times, when the application hasn't terminated, this will be
STILL_ACTIVE. Use
the function GetExitCodeProcess for this. I'll put the termination
status in the
integer intExitCode. I have the handle of the application I want to
close ready
in the variable AppHandle.
}
GetExitCodeProcess(AppHandle, intExitCode);
{
Now that you have the termination status, you can post a WM_QUIT
message to
the application. Posting a WM_QUIT message requires that
you also send the
termination status.
}
PostMessage(AppHandle, WM_QUIT, intExitCode, 0);
{
The last parameter has to be 0 (zero) because there is room for two
parameters in the PostMessage function.
When posting a WM_QUIT message only one
of them is used, so the other one should be zero.
<p>Now the application should terminate.
}
]]>