Direct Input 7 Keyboard Class

Environment: Win9x, Windows NT/2000, DirectX Installed

Introduction

To use the class, define a global variable :-

CDIKeyboard myKeyboard;

You will have to supply the HWND for the parent window under which you wish to take Keyboard Control.

The class has the following public methods:-

• CDIKeyboard.SetHWND(HWND)
  

  Set the windows handle to which Direct Input Will be attached to. Must be the Parent Window.

 

• void CDIKeyboard.SetHWND(CWnd*)
  

  
  Set the windows handle to which Direct Input Will be attached to. Must be the Parent Window. MFC Version.

  CDIKeyboard mkbrd;
  mkbrd.SetHWND(this);
  

 

• bool CDIKeyboard.PollDevice(void)
  

  
  Obtain and update the keyboard state information.

 

• bool CDIKeyboard.IsKeyPressed(unsigned char)
  

  
  returns true if a DIK_KEY is pressed, false if not. Example:

  mkbrd.IsKeyPressed(DIK_F1);
  

 

• bool CDIKeyboard.Acquire(bool state)
  

  
  Acquire/Unacquire the Keyboard Device.  You will need to Unacquire the device if you want Windows to handle WM_CHAR, WM_KEYUP, WM_KEYDOWN messages.

  state=true To Acquire
  state=false To UnAcquire

  Returns : true=Operation Successful, false=Operation unsuccessful

Before obtaining keyboard state information you will need to set the HWND of the parent window of your application.  Use PollDevice method before checking the Keyboard state information and IsKeyPressed(key) method to check a particular key has been pressed.

The following code snippet can be used to show which keys have been pressed

bool m_bInput;
myKeyboard.PollDevice();
	
m_bInput=myKeyboard.IsKeyPressed(DIK_F1)?true:false;

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