Bug Cannot query value of control '/VirtualMouse/position'

Hello,

I'm using version 1.0.2 - January 21, 2021 and I downloaded the sample "Gamepad mouse cursor", everything works great, but when I set gameObject.setActive(false) and set gameObject.setActive(true) , there is a error:

InvalidOperationException: Cannot query value of control '/VirtualMouse/position' before 'VirtualMouse' has been added to system!

UnityEngine.InputSystem.InputControl.ResolveDeviceIndex () (at Library/PackageCache/com.unity.inputsystem@1.0.2/InputSystem/Controls/InputControl.cs:904)
UnityEngine.InputSystem.InputControl.get_currentStatePtr () (at Library/PackageCache/com.unity.inputsystem@1.0.2/InputSystem/Controls/InputControl.cs:787)
UnityEngine.InputSystem.InputControl`1[TValue].ReadValue () (at Library/PackageCache/com.unity.inputsystem@1.0.2/InputSystem/Controls/InputControl.cs:939)
UnityEngine.InputSystem.UI.VirtualMouseInput.TryEnableHardwareCursor () (at Assets/Samples/Input System/1.0.2/Gamepad Mouse Cursor/VirtualMouseInput.cs:393)
UnityEngine.InputSystem.UI.VirtualMouseInput.OnEnable () (at Assets/Samples/Input System/1.0.2/Gamepad Mouse Cursor/VirtualMouseInput.cs:284)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr, Boolean&)



How can I disable the virtual cursor and enable it without error? I want to use the system mouse again.

 

I'm having this same problem, did you solve it? :/

 

I just had the same issue and thought I’d post some notes. The issue in my case happens when loading a new scene which contains VirtualMouseInput. I can currently work around this by disabling the VirtualMouseInput component and then enabling it from another components Start() method.

 

Using 2019.4.20f1 LTS and I am getting this bug.

I tried disabling the component before its game object was deactivated and then enabling it after its game object was activated like the previous post describes but still getting the error.

UPDATE: Fixed it

To fix it go to OnEnable in the VirtualMouseInput script

Find this bit of code

Code (CSharp):

1.    // Hijack system mouse, if enabled.
2.             if (m_CursorMode == CursorMode.HardwareCursorIfAvailable)
3.                 TryEnableHardwareCursor();

By default its above this bit of code

Code (CSharp):

1.  // Add mouse device.
2.             if (m_VirtualMouse == null)
3.             {
4.                 m_VirtualMouse = (Mouse)InputSystem.AddDevice("VirtualMouse");
5.             }        
6.             else if (!m_VirtualMouse.added)
7.             {
8.              
9.                 InputSystem.AddDevice(m_VirtualMouse);
10.             }

You want it to be after the above code so move move it beneath it so it looks like this

Code (CSharp):

1.     // Add mouse device.
2.             if (m_VirtualMouse == null)
3.             {
4.                 m_VirtualMouse = (Mouse)InputSystem.AddDevice("VirtualMouse");
5.             }        
6.             else if (!m_VirtualMouse.added)
7.             {
8.              
9.                 InputSystem.AddDevice(m_VirtualMouse);
10.             }
11.        
12.             // Hijack system mouse, if enabled.
13.             if (m_CursorMode == CursorMode.HardwareCursorIfAvailable)
14.                 TryEnableHardwareCursor();
15.  

You can now deactivate/activate the gameObject the VirtualMouse is on and it will work without an error popping up.

 

When virtual mouse is spawned, controller mode switches to keyboard and mouse even when using the gamepad, do you know any fix? playerinput.currentcontrolscheme switches to keyboard andmouse

 

Are you using the example that uses VirtualMouseInput.cs?

Is the gamepad detected? If you use

Code (CSharp):

1. Debug.Log(Gamepad.all.Count + " gamepad's detected");

Is more than one detected?

 

Yes the gamepad is detected but for some reason the controls switch to keyboard and mouse, unless I move the stick a bit before spawning the virtual mouse

 

Nevermind the problem was that I wasnt spawning the virtual cursor prefab all good now, thank you

 

Two years have passed, and I've had to resort to this workaround since I encountered the same issue mentioned in the original post. When I attempt to activate the "Virtual Mouse" while using a gamepad and deactivate it when the player switches to a mouse, I still encounter the same error.

Is there a more efficient or effective solution to make this work seamlessly?

 

InputSystem is now version 1.7.0 and it still has this error.

And using imaginationrabbit idea is not possible as the script will redo any changes immediately itself.

You need to do this with the InputSystem package before:
https://support.unity.com/hc/en-us/articles/9113460764052-How-can-I-modify-built-in-packages

Then you can modify the script as imaginationrabbit said and the error is gone.

But for me I found out that scaling the virtual mouse rect transform to 0 is better than to deactivate it. It fixed for me some other errors as well and still acts as if the virtual mouse is deactivated.

 

any chances of this gettings fixed?

edit: Instead of removing and adding the m_VirtualMouse you can DisableDevice and EnableDevice it instead and then it doesn't throw exceptions.

 

Where do you call DisableDevice and EnableDevice?

 

In a copy of a VirtualMouseInput.cs (renamed the class and file to VirtualMouseInput2) file that is inside my Assets folder instead of the Packages,

Enable the device after the mouse is created or added in the OnEnable block

Code (CSharp):

1. // Add mouse device.
2. if (m_VirtualMouse == null)
3.     m_VirtualMouse = (Mouse)InputSystem.AddDevice("VirtualMouse");
4. else if (!m_VirtualMouse.added)
5.     InputSystem.AddDevice(m_VirtualMouse);
6.  
7. InputSystem.EnableDevice(m_VirtualMouse);

Modify the OnDisable, to use DisableDevice instead of RemoveDevice

Code (CSharp):

1. // Remove mouse device.
2. if (m_VirtualMouse != null && m_VirtualMouse.added)
3.     InputSystem.DisableDevice(m_VirtualMouse);

Remember to attach the copied VirtualMouseInput2 instead of the VirtualMouseInput. You can use the Debug mode of the inspector to replace the reference to the script file.