Problems with modal dialog when calling C# from C++

Lester · Joined: 13 Dec 2007 Posts: 2

I have main application (with main window) created in C++/MFC. From
there I call function in C# class library to display a modal WPF
dialog. Dialog shows up OK, but it doesn't behave really modal. While
it is not possible to go to the main window by clicking directly on it
(dialog keeps focus), the application shows twice in the taskbar (1
entry for main window, 1 entry for the WPF dialog). Through the
taskbar I can switch to main window and even though it behaves
disabled, this definitely doesn't look profesional. The application is
supposed to show up in the taskbar only once.

I tried to pass from C++ a window handle to C#, using it to construct
NativeWindow and pass it as an owner, however, Window.Owner doesn't
accept NativeWindow type.

Any ideas how to make this work?

Thank you,

LK

Archived from group: microsoft>public>dotnet>languages>csharp

Nicholas Paldino [.NET/C# · Joined: 08 Aug 2007 Posts: 71

Lester,

You probably want to use the WindowInteropHelper class:

http://msdn2.microsoft.com/en-us/library/system.windows.interop.windowinterophelper.aspx

Once you pass the instance of your Window that you want to show, you can
use the Handle and Owner properties to set the owner of the window, and to
get the handle to work with.

--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

"Lester" wrote in message @a35g2000prf.googlegroups.com...
>I have main application (with main window) created in C++/MFC. From
> there I call function in C# class library to display a modal WPF
> dialog. Dialog shows up OK, but it doesn't behave really modal. While
> it is not possible to go to the main window by clicking directly on it
> (dialog keeps focus), the application shows twice in the taskbar (1
> entry for main window, 1 entry for the WPF dialog). Through the
> taskbar I can switch to main window and even though it behaves
> disabled, this definitely doesn't look profesional. The application is
> supposed to show up in the taskbar only once.
>
> I tried to pass from C++ a window handle to C#, using it to construct
> NativeWindow and pass it as an owner, however, Window.Owner doesn't
> accept NativeWindow type.
>
> Any ideas how to make this work?
>
> Thank you,
>
> LK

Lester · Joined: 13 Dec 2007 Posts: 2

With WindowInteropHelper, it is not possible to get the focus back on
the parent (C++) window. However, both windows (parent C++ and child
C# WPF dialog) still show in the taskbar.

Is there any way to remove WPF dialog from the taskbar, or prevent it
from showing up there?

Thank you,

Lester

On Dec 13, 7:33 am, "Nicholas Paldino [.NET/C# MVP]"
wrote:
> Lester,
>
> You probably want to use the WindowInteropHelper class:
>
> http://msdn2.microsoft.com/en-us/library/system.windows.interop.windo...
>
> Once you pass the instance of your Window that you want to show, you can
> use the Handle and Owner properties to set the owner of the window, and to
> get the handle to work with.
>
> --
> - Nicholas Paldino [.NET/C# MVP]
> - m...@spam.guard.caspershouse.com
>

Nicholas Paldino [.NET/C# · Joined: 08 Aug 2007 Posts: 71

Lester,

With the window handle, you will have to make it so that the extended
window handle does not have the WS_EX_APPWINDOW bit set, so that it doesn't
appear in the taskbar.

Or, you could create a .NET form, host the WPF control in that, and then
set the ShowInTaskbar property of the form to false.

--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

"Lester" wrote in message @d4g2000prg.googlegroups.com...
> With WindowInteropHelper, it is not possible to get the focus back on
> the parent (C++) window. However, both windows (parent C++ and child
> C# WPF dialog) still show in the taskbar.
>
> Is there any way to remove WPF dialog from the taskbar, or prevent it
> from showing up there?
>
> Thank you,
>
> Lester
>
> On Dec 13, 7:33 am, "Nicholas Paldino [.NET/C# MVP]"
> wrote:
>> Lester,
>>
>> You probably want to use the WindowInteropHelper class:
>>
>> http://msdn2.microsoft.com/en-us/library/system.windows.interop.windo...
>>
>> Once you pass the instance of your Window that you want to show, you
>> can
>> use the Handle and Owner properties to set the owner of the window, and
>> to
>> get the handle to work with.
>>
>> --
>> - Nicholas Paldino [.NET/C# MVP]
>> - m...@spam.guard.caspershouse.com
>>

Nicholas Paldino [.NET/C# · Joined: 08 Aug 2007 Posts: 71

Sorry, that should be "extended window style", not "extended window
handle".

--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

"Nicholas Paldino [.NET/C# MVP]" wrote in
message @microsoft.com...
> Lester,
>
> With the window handle, you will have to make it so that the extended
> window handle does not have the WS_EX_APPWINDOW bit set, so that it
> doesn't appear in the taskbar.
>
> Or, you could create a .NET form, host the WPF control in that, and
> then set the ShowInTaskbar property of the form to false.
>
>
> --
> - Nicholas Paldino [.NET/C# MVP]
> - mvp@spam.guard.caspershouse.com
>
>
> "Lester" wrote in message
> @d4g2000prg.googlegroups.com...
>> With WindowInteropHelper, it is not possible to get the focus back on
>> the parent (C++) window. However, both windows (parent C++ and child
>> C# WPF dialog) still show in the taskbar.
>>
>> Is there any way to remove WPF dialog from the taskbar, or prevent it
>> from showing up there?
>>
>> Thank you,
>>
>> Lester
>>
>> On Dec 13, 7:33 am, "Nicholas Paldino [.NET/C# MVP]"
>> wrote:
>>> Lester,
>>>
>>> You probably want to use the WindowInteropHelper class:
>>>
>>> http://msdn2.microsoft.com/en-us/library/system.windows.interop.windo...
>>>
>>> Once you pass the instance of your Window that you want to show, you
>>> can
>>> use the Handle and Owner properties to set the owner of the window, and
>>> to
>>> get the handle to work with.
>>>
>>> --
>>> - Nicholas Paldino [.NET/C# MVP]
>>> - m...@spam.guard.caspershouse.com
>>>
>

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