Processcmdkey not trigerred in winforms window invoked from a C++ application

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We have a C# DLL which is invoked from a C++ application. The C# Winform window sits on top of the C++ Main Window. Noticed that we are unable to capture the ProcessCmdKey method. Any idea why we are unable to trigger this?

C#

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)

What I have tried:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)

Posted 11-Jul-17 6:34am

Guru16

Updated 11-Jul-17 7:15am

Afzaal Ahmad Zeeshan

v2

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Comments

Richard MacCutchan 11-Jul-17 12:51pm

You need to provide more information. Where is this method and how does it relate to the other windows?

Guru16 11-Jul-17 12:59pm

The method resides in Winform (Form1.cs). The C++ application invokes a method in c# Application.cs which in turn shows our Winform.

[no name] 11-Jul-17 13:28pm

Maybe a KeyPreview Issue?
Form.KeyPreview-Eigenschaft (System.Windows.Forms)[^]

Guru16 11-Jul-17 13:56pm

It's set to true.

[no name] 11-Jul-17 14:20pm

You wrote "The C# Winform window sits on top of the C++ MainWindow", what it means exactly? Is c# window's parent set to the C++ MainWindow?

Guru16 11-Jul-17 15:32pm

We have a C++ main window. From C++ we call a method in C# class. then we show a C# form which actually sits on top of that C++ window as a modal dialog.

Dave Kreskowiak 11-Jul-17 14:38pm

How exactly is the C# window instantiated and shown to the user?

I suspect it's because the C# window isn't connected to the message pump in the C++ parent code.

Guru16 11-Jul-17 15:23pm

The C++ component invokes a method in C# class..then within c# we do a Form.Show and show our C# window.

Dave Kreskowiak 11-Jul-17 16:11pm

OK, I was looking more for the code on the C++ side. Is this an MFC app, CLI, ???

Is the C# library exposed through COM?

Guru16 11-Jul-17 16:23pm

MFC application. And yes C# library is COM exposed.

Dave Kreskowiak 11-Jul-17 16:32pm

OK, normally you wouldn't show the form. Normally, you'd create a UserControl or similar (still expoed through COM) and add the control to a MFC Dialog. The message routing goes through the normal C++ code instead of relying on your to wire it up yourself to a C# Form, something like this[^].

Instead of Form.Show, you might want to try Application.Run instead. I've never seen a Form being used, but have seen controls used.

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