error while registering the hotkey in C#

Question

I am using the below code to register hotkeys using c#. But sometimes i get the exception throwing "Couldn’t register the hot key." What will be the reason for this error ? And for not being consistent. How can i handle this ?

If i add hook.RegisterHotKey(ModifyKey.Control,Keys.V); no error but where as if I add

hook.RegisterHotKey(ModifyKey.Win, Keys.D); // Because of this exception throws

public void RegisterHotKey(ModifierKeys modifier, Keys key)
{
// increment the counter.
_currentId = _currentId + 1;

        // register the hot key.  
        if (!RegisterHotKey(_window.Handle, _currentId, (uint)modifier, (uint)key))  
            throw new InvalidOperationException("Couldn’t register the hot key."); // exception throws  
}  

Can anyone give me a solution to solve this and That will be very much useful for me thank in advance

Answer 1

@Dineshkumar.S , Welcome to Microsoft Q&A, based on my test from the answer, I reproduced your problem.

As Viorel suggested, we could get the error code to check where is the problem.

I change the following code in the RegisterHotKeyInternal method to get the error code.

If used the following code to register hotkey Windows+D, I will get the error code1409.

Based on the description from the GitHub, the error means that Hot key is already registered.

Therefore, Windows +D could not be registered as hotkeys.

I recommend that you don't use Windows Key as the hotkey, because Windows Key already defined many hotkeys.

Hope my explanation could help you.

Best Regards,
Jack

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