Show/Hide icon of my application in the Window taskbar at run time

[sqrt(-1)]

Hi all,

I'd like that my application is hidden in the tray when the user minimizes it.
The portion of the tray handling works correctly, but I'm not able to manage a small detail:
When the application is minimized in the tray, the panel becomes invisible but the application icon remains in the Windows taskbar. But I want the icon in the taskbar to disappear when the application is hidden in the tray and to reappear when the panel is visible.

In this document http://digital.ni.com/public.nsf/allkb/6E660558F3D420C786256FCB005B4F52  is reported how to hide the taskbar icon. It works but it cannot be applied at run time.

MSDN documents report this:

To prevent the window button from being placed on the taskbar, create the unowned window with the WS_EX_TOOLWINDOW extended style. As an alternative, you can create a hidden window and make this hidden window the owner of your visible window.

The Shell will remove a window's button from the taskbar only if the window's style supports visible taskbar buttons. If you want to dynamically change a window's style to one that doesn't support visible taskbar buttons, you must hide the window first (by calling ShowWindow with SW_HIDE), change the window style, and then show the window.

So, I've tried to use WINAPI (user32.dll) but without success.

[GerdW]

Hi i,

did you try the INI key "HideRootwindow=True" for your executable?

Don't you get a taskbar entry when your main window is open?

[sqrt(-1)]

Hi all,

Sorry, I've duplicated my post of some hours ago because, for some reason, I receive e-mail notifications related to my post but I'm not able to view it anymore.

Here is my problem:

I'd like that my application is hidden in the tray when the user minimizes it.
The portion of the tray handling works correctly, but I'm not able to manage a small detail:
When the application is minimized in the tray, the panel becomes invisible but the application icon remains in the Windows taskbar. But I want the icon in the taskbar to disappear when the application is hidden in the tray and to reappear when the panel is visible.

In this document http://digital.ni.com/public.nsf/allkb/6E660558F3D420C786256FCB005B4F52 is reported how to hide the taskbar icon. It works but it cannot be applied at run time.

MSDN documents report this:
To prevent the window button from being placed on the taskbar, create the unowned window with the WS_EX_TOOLWINDOW extended style. As an alternative, you can create a hidden window and make this hidden window the owner of your visible window.

The Shell will remove a window's button from the taskbar only if the window's style supports visible taskbar buttons. If you want to dynamically change a window's style to one that doesn't support visible taskbar buttons, you must hide the window first (by calling ShowWindow with SW_HIDE), change the window style, and then show the window.

So, I've tried to use WINAPI (user32.dll) but without success.

As suggested by GerdW, I've already tried the INI key "HideRootwindow=True" for my executable. It hides the application icon in the taskbar, but I cannot show/hide it at run time.

[zou]

> So, I've tried to use WINAPI (user32.dll) but without success.

No need to reinvent the wheel.

You can download:

Windows API Function Utilities (32-bit) for LabVIEW

https://forums.ni.com/t5/Example-Code/Windows-API-Function-Utilities-32-bit-for-LabVIEW/ta-p/3996462

[Alexander_Sobolev · Accepted solution]

For application.exe in file application.ini add row HideRootWindow=True

When you activate VI, set VI-> Property node Front Panel window.Minimizable = True, show window (invoke node VI.Open, window state = standard).

When hiding, you need to track that, set Minimizable = False

Taskbar icon will appear and disappear with window

[sqrt(-1)]

Thanks Alexander. I just needed to set Minimizable = FALSE

It works fine!!

[azadplc007]

Thanks for your tips, Alex... 

I got what I expected !!!

[NI_CN-navI]

Hi Alexander

For app.exe  is  okay；

But it doesn't work  when I run VI directlly as i follow below .png shortcut ，still show its icon in taskbar；

Do you have other methods ?

Thx