关于WinUser键盘鼠标钩子

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");

		

	}

}

以上代码  
为什么执行 User32.INSTANCE.GetMessage(msg,null,0,0); 
才有HOOKPROC的callBack调用？
有没有去掉GetMessage就可调用callBack的方法 
主要是因为GetMessage阻塞了线程；
MFC的系统钩子我也看过了 
对这块很不理解 
抛砖引玉 多指教分多多送


------解决方案--------------------
没玩过jna，帮你顶下。