Troublesome mouse/keyboard problem

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Hi people

i'm making a program to remotely block stuff from an administrator to a client PC
such as internet access, etc.

i want to block the mouse and keyboard on a button click, then enable when i click another button. however, the internet provides strange subclassing, hooks and registry keys. does anyone have a decent code?

The registry keys only work upon reboot-therefore not an option.

i'm using vb2010

by the way, does anyone know how to block AND UNBLOCK internet drivers?

thanks very much :)

Posted 31-Oct-12 1:15am

Rixterz123

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Sergey Alexandrovich Kryukov 31-Oct-12 14:13pm

What do you mean by VB, exactly? VB.NET, I presume? Then tag it VB.NET, which is not quite a VB. You are the one who is most interested in appropriate tags.
What "block a driver" is supposed to mean, exactly? The purpose? :-)
--SA

2 solutions

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Jacques Loubser · Answer 1 · 2012-11-02T20:55:00

Solution 1

Hi
You can try using DirectX. Run a Service or invisible program(one that never reaches the end of the Load Event) that uses DirectX to take sole control over the keyboard & mouse. I don't know if Windows will allow this, but it is supposed to work, especially with joysticks etc.

Jacques

Posted 2-Nov-12 20:55pm

Jacques Loubser

Comments

[no name] 4-Nov-12 14:21pm

Ok. Thanks for replying.
How would i go around controlling DirectX to control the mouse/keyboard?
i thought you could just have something like this in VB:
<DllImport #whatever#>

then:

button1.click:

blockMouseAndKeyboard(True)

then none of the system can be controlled
do you have anything like this?

Jacques Loubser 6-Nov-12 3:30am

Let me try and work out the code, then I will post it. I don't have it in VB, but I found a conversion tool.

[no name] 6-Nov-12 10:49am

brilliant! thanks so much for taking your time and not ignoring me like other web users :)

Nelek 11-Nov-12 10:40am

OP's comment moved from non-solution below
so... do you have the code yet? i'm sorry if it seems like i'm rushing you, but my project hangs on your answer. thanks :)

Jacques Loubser 12-Nov-12 7:33am

Done! Check out the solutions, it is among them.

Jacques Loubser · Answer 2 · 2012-11-12T01:32:00

Okay Here it Is

First, you must download ht Windows SDK (it has the Direct X SDK included) You will also want to download a redirstrabutable Direct X as you will your application will require it.

Second here are the Import statements:

VB

Imports Microsoft.DirectX
Imports Microsoft.DirectX.Direct3D

Then you must declare your variables:

VB

Dim keyboard As DirectInput.Device = Nothing
Dim mouse As DirectInput.Device = Nothing

To Get the Keyboard and Mouse use this:

C#

keyboard.SetCooperativeLevel(
this,
DirectInput.CooperativeLevelFlags.Background | DirectInput.CooperativeLevelFlags.Exclusive );
keyboard = new DirectInput.Device( DirectInput.SystemGuid.Keyboard );
keyboard.Acquire();

mouse = new DirectInput.Device( DirectInput.SystemGuid.Mouse );
mouse.SetCooperativeLevel(
this,
DirectInput.CooperativeLevelFlags.Background | DirectInput.CooperativeLevelFlags.Exclusive );
mouse.SetDataFormat( DirectInput.DeviceDataFormat.Mouse );
mouse.Acquire();

Note: This only gives exclusive access of the Keyboard and Mouse to your Program.
Your program can still get keyboard and mouse inputs (by polling) if you write the extra code.

Microsoft say over and over again on their website, "For security reasons, do not set the CooperativeLevelFlags to Exclusive"(on the keyboard and mouse). You have been warned!!!

Your program will have to handle getting rid of the restriction.
I thought of writing a small app that takes the keyboard and mouse exclusively. To start the restriction, start the app. Then to terminate the restriction, you will have to find some way to terminate the program properly, through the Application.Close() method. I have some Ideas, but I am not going to try to explain it.

I can't find a unacquire snippet, so I think unacquire is called on App Exit.
This code has been converted to VB from C# with the help of http://www.developerfusion.com[^]
If it does not work, I can write the small app in C# for you.