About WinUser keyboard and mouse hook

import com.sun.jna.platform.win32.Kernel32;
  import com.sun.jna.platform.win32.User32;
  import com.sun.jna.platform.win32.WinUser;
  import com.sun.jna.platform.win32.WinDef.HMODULE;
  import com.sun.jna.platform.win32.WinDef.LRESULT;
  import com.sun.jna.platform.win32.WinDef.WPARAM;
  import com.sun.jna.platform.win32.WinUser.HHOOK;
  import com.sun.jna.platform.win32.WinUser.HOOKPROC;
  import com.sun.jna.platform.win32.WinUser.KBDLLHOOKSTRUCT;
  import com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc;
  import com.sun.jna.platform.win32.WinUser.MSG;
  
  /**
   * @author Administrator
   */
  public class MyHooker extends Thread{
  
  	
  	private static HHOOK kHHOOK=null;
  	private static HHOOK mHHOOK=null;
  	private static HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null); 
  	private static MSG msg=new MSG();
  	
  	public void run(){
  		HOOKPROC kHOOK=new LowLevelKeyboardProc(){
      		public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT lParam) {  
      			MyThread.i=0;
      			return User32.INSTANCE.CallNextHookEx(kHHOOK, nCode,wParam,lParam.getPointer());
      		}
      	}; 
      	HOOKPROC mHOOK=new LowLevelKeyboardProc(){
      		public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT lParam) {  
      			MyThread.i=0;
      			return User32.INSTANCE.CallNextHookEx(mHHOOK, nCode,wParam,lParam.getPointer());
      		}
      	}; 
      	kHHOOK= User32.INSTANCE.SetWindowsHookEx(WinUser.WH_KEYBOARD_LL,kHOOK,hMod,0);  
  		mHHOOK= User32.INSTANCE.SetWindowsHookEx(WinUser.WH_MOUSE_LL,mHOOK,hMod,0); 
  		System.out.println("^^^^^^^^^^^^^^^^");
  		
  		User32.INSTANCE.GetMessage(msg,null,0,0);
  		
  		/*while(true){
  			boolean a=User32.INSTANCE.PeekMessage(msg,null,0,0,1);
  			System.out.println("PeekMessage:"+a);
  		}*/
  		System.out.println("$$$$$$$$$$$$$$$$");
  	}
  	
  	public static void unHook(){
  		System.out.println("unHook start...");
  		//User32.INSTANCE.DispatchMessage(msg);
  		User32.INSTANCE.UnhookWindowsHookEx(kHHOOK);  
  		User32.INSTANCE.UnhookWindowsHookEx(mHHOOK); 
  		System.out.println("unHook end");
  		
  	}
  }

code above
Why perform User32.INSTANCE.GetMessage (msg, null, 0,0);
have HOOKPROC of callBack call ?
There are not removed can call GetMessage method callBack
mainly because GetMessage blocking the thread ;
MFC system hook I have seen
not understand that piece
initiate a lot more advice of delivery


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never played jna, Bangniding next .
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Am I a cold field Timor ?
Top about !
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