Cant hide window from taskbar when executing application created with
Lazarus
lazarus / 34-Windows

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MaartenJB · 2021-08-16 11:54

Hi,

I want to launch an application with TProcess made with Lazarus, but
it won't let me hide the application. If I do the same with for
example mspaint.exe it works fine:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i uses ...,
process; var  aProcess: TProcess;begin   aProcess :=
TProcess.Create(nil);  try     if (CheckBox1.Checked)    then
aProcess.CommandLine := 'mspaint.exe'           // <--- Works    else
aProcess.CommandLine := 'C:\Temp\project1.exe';  // <--- Doesnt Work
 ( Vanilla Lazarus application )     aProcess.CurrentDirectory:=
ExtractFilePath(aProcess.CommandLine);    aProcess.Options :=
aProcess.Options - [poWaitOnExit];    aProcess.ShowWindow:=swoHIDE;  
 // <---  This should hide the application    aProcess.Execute; 
finally    aProcess.Free;  end;end;

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lucamar · 2021-08-16 12:53

Since you seem to be in Windows, try with:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i     {...
etc ...}    Exclude(aProcess.Options, poWaitOnExit); {==
aProcess.Options - [poWaitOnExit];}    Include(aProcess.Options,
poNoConsole);    aProcess.ShowWindow:=swoHIDE;    {... etc ...}
Note, though, that some programs don't like to be run hidden, so they
take steps to prevent it in their own initialization. There's nothing
you can do about it.

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winni · 2021-08-16 14:54

Hi!

For Windows only there is the  property TPROCESS.ShowWindow:

Try the option swoHide.

Winni

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lucamar · 2021-08-16 14:58

Quote from: winni on August 16, 2021, 04:54:47 pmFor Windows only
there is the  property TPROCESS.ShowWindow:

Try the option swoHide.
That was already in the OP's oiginal code. It's in fact what got him
baffled: that it works with mspaint.exe but not with (his?)
testmon.exe

Just saying ...

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winni · 2021-08-16 15:25

Hi!

What ist testmon.exe?

If it is your own code:
Does it got wsMaximized or fsStayOnTop?


Quote from: lucamar on August 16, 2021, 04:58:49 pm
That was already in the OP's oiginal code.

Sorry. Lack of concentration.
Just looking in the airspace over Afghanistan.
Turkish Airforce just flew in it with an A400M (TUAF580 )

Winni

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MaartenJB · 2021-08-17 06:59

Thanks for responding

@lucamar, I've tried it your suggestion, but it still appears in the
taskbar.

@winni, testmon.exe is just a blanco/vanilla Lazarus application, i've
changed the name to project1.exe to make it more clear.