ShowinTaskBar -- Backwards Question

[Guest]

I program in both C# WinForms and C++ Windows SDK. In C# WinForms there is a
property for the Form called ShowInTaskBar which removes the window from the
taskbar if False. This is a nice feature, however I would love to do this in
C++/Windows SDK. The question is how is this accomplished in Windows SDK?
Is it a flag when I do a CreateWindow?

I know this isn't a WinForm question, however I was hoping there was an old
hand at Windows GUI programming hanging around that could enlighten me.

-Wayne

 

[Jason Newell]

I believe you need to remove the WS_EX_TOOLWINDOW style from the window.
Google for 'WS_EX_TOOLWINDOW' to see examples.

Jason Newell
www.jasonnewell.net

 

[bj7lewis]

I believe you need to remove the WS_EX_TOOLWINDOW style from the window.

Google for 'WS_EX_TOOLWINDOW' to see examples.

That change the window's non-client window part to a tool window style but
yes removes the app from taskbar...

Try removing WS_EX_APPWINDOW from extended styles instead if you need the
normal non-client window style...

 

[Guest]

I program in both C# WinForms and C++ Windows SDK. In C# WinForms there is a
property for the Form called ShowInTaskBar which removes the window from the
taskbar if False. This is a nice feature, however I would love to do this in
C++/Windows SDK. The question is how is this accomplished in Windows SDK?

See "Managing Taskbar Buttons" at
http://msdn2.microsoft.com/en-us/library/bb776822.aspx

--Rob

 

[Linda Liu[MSFT]]

Hi Wayne,

Based on my understanding, you'd like to hide a form from the taskbar
through Windows API functions. If I'm off base, please feel free to let me
know.

To get what you want, the first step is to remove the WS_EX_APPWINDOW flag
from the extended window style of the form firstly. We can do this by
calling the Win32 function SetWindowLong. The second step is to set the
owner of this form to an invisible form.

The following is a sample in C#:

using System.Runtime.InteropServices;
public partial class Form1 : Form
{
public Form1()
{
int style = GetWindowLong(this.Handle, GWL_EXSTYLE);
style &= ~WS_EX_APPWINDOW;
SetWindowLong(this.Handle, GWL_EXSTYLE, style);
this.Owner = new Form();
}

public static int WS_EX_APPWINDOW = 0x40000;
public static int GWL_EXSTYLE = -20;

DllImport("user32.dll")]
public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int
dwNewLong);
[DllImport("user32.dll")]
public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

}

The following is sample in C++:
'How to dynamically show/hide the Taskbar application button'
http://www.codeguru.com/cpp/frameworks/advancedui/article.php/c3227/

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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