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Managing Device References in DirectInput for Creating a Virtual Keyboard

This guide outlines how to manage ambiguous references when working with the DirectInput API in Microsoft DirectX, particularly for distinguishing between different device types. We explore creating a virtual keyboard by declaring a DirectInput device and initializing it. The document details two methods for gathering user input: polling and event notification, with a focus on the polling method for this implementation. It also explains how to retrieve keyboard state information to check specific key presses and respond accordingly, using the function GetCurrentKeyboardState().

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Managing Device References in DirectInput for Creating a Virtual Keyboard

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  1. DirectInput

  2. using Microsoft.DirectX.DirectInput;

  3. Error ambigious reference

  4. Teh keyboard is also a device • So we need so make them distinguishable

  5. We could distinguish beteween the two different types of devices writing out their full names Microsoft.DirectX.Direct3D.Device mydevice; Microsoft.DirectX.DirectInput.Devicemykeyboard;

  6. Or we could use alias • using DirectInput = Microsoft.DirectX.DirectInput; • using Direct3D = Microsoft.DirectX.Direct3D;

  7. We need to change all the graphic-card-type -devices we have in the code, as for example Device mindevice = null; to Direct3D.Device mindevice = null;

  8. How to create a virtual keyboard First we need to declare a variable of the type DirectInput.Device DirectInput.Devicemykeyboard=null;

  9. How to create a virtual keyboard Then we need to create it /initialize it

  10. Best done in a function void intierartangentbordet() { mykeyboard=new DirectInput.Device (DirectInput.SystemGuid.Keyboard); mykeyboard.SetCooperativeLevel(this,DirectInput.CooperativeLevelFlags.Background|DirectInput.CooperativeLevelFlags.NonExclusive ); mykeyboard.Acquire(); }

  11. So now we have a vritual keyboard • How can the program get information about • When/if a tangent is used by a user.

  12. There are two different ways 1) polling 2)event notifier

  13. There are two different ways 1) polling // the program aske the keyboard 2)event notifier// the keyboard informs the program by sending an event....

  14. We will use the first method • Polling. • In each lap the program askes the keyboard if there might be a tangent down or not?

  15. In order to ”ask” the keyboard we will use a function called • GetCurrentKeyboardState()

  16. In order to ”ask” the keyboard we will use a function called • GetCurrentKeyboardState() • This function returns an array with information about the status of the keyboard

  17. If we want to know if down arrow is hit • Then we check the array returned by the • GetCurrentKeyboardState • In this case called kstate • kstate[DXinput.Key.DownArrow]

  18. DirectInput.KeyboardStatekstate = mykeyboard.GetCurrentKeyboardState();if (kstate[DirectInput.Key.DownArrow]) • Change the y coordinate….…….. • else • ...........

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