jna test【鼠标 键盘钩子】

package jna_test;

import com.sun.jna.platform.win32.WinDef.LRESULT;
import com.sun.jna.platform.win32.WinDef.WPARAM;
import com.sun.jna.platform.win32.WinUser.HOOKPROC;

interface LowLevelMouseProc extends HOOKPROC {
	LRESULT callback( int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam );
}

package jna_test;

import com.sun.jna.Structure;
import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinUser.POINT;

public class MOUSEHOOKSTRUCT extends Structure {
	public class ByReference extends MOUSEHOOKSTRUCT implements
			Structure.ByReference {
	};
	
	public POINT		pt;
	public HWND			hwnd;
	public int			wHitTestCode;
	public ULONG_PTR	dwExtraInfo;
}

package jna_test;

import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.User32;
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;
import com.sun.jna.platform.win32.WinUser.HHOOK;
import com.sun.jna.platform.win32.WinUser.KBDLLHOOKSTRUCT;
import com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc;
import com.sun.jna.platform.win32.WinUser.MSG;

public class MouseLLHook {
	
	// 鼠标钩子函数里判断按键类型的常数
	public static final int		WM_LBUTTONUP	= 514;
	public static final int		WM_LBUTTONDOWN	= 513;
	public static final int		WM_RBUTTONUP	= 517;
	public static final int		WM_RBUTTONDOWN	= 516;
	public static final int		WM_MOUSEHWHEEL	= 526;
	public static final int		WM_MOUSEWHEEL	= 522;
	public static final int		WM_MOUSEMOVE	= 512;
	
	static HHOOK				mouseHHK, keyboardHHK;	// 鼠标、键盘钩子的句柄
	static LowLevelMouseProc	mouseHook;				// 鼠标钩子函数
	static LowLevelKeyboardProc	keyboardHook;			// 键盘钩子函数
														
	// 安装钩子
	static void setHook() {
		HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle( null );
		mouseHHK = User32.INSTANCE.SetWindowsHookEx( WinUser.WH_MOUSE_LL,
				mouseHook, hMod, 0 );
		keyboardHHK = User32.INSTANCE.SetWindowsHookEx( WinUser.WH_KEYBOARD_LL,
				keyboardHook, hMod, 0 );
	}
	
	// 卸载钩子
	static void unhook() {
		User32.INSTANCE.UnhookWindowsHookEx( keyboardHHK );
		User32.INSTANCE.UnhookWindowsHookEx( mouseHHK );
	}
	
	public static void main( String[] args ) {
		
		keyboardHook = new LowLevelKeyboardProc() {
			
			@Override
			// 该函数参数的意思参考：http://msdn.microsoft.com/en-us/library/windows/desktop/ms644985(v=vs.85).aspx
			public LRESULT callback( int nCode, WPARAM wParam,
					KBDLLHOOKSTRUCT lParam ) {
				int w = wParam.intValue();
				// 按下alt键时w=.WM_SYSKEYDOWN; 按下其他大部分键时w=WinUser.WM_KEYDOWN
				if ( w == WinUser.WM_KEYDOWN || w == WinUser.WM_SYSKEYDOWN )
					System.out.println( "key down: vkCode = " + displayCode( lParam.vkCode ) );
				else
					if ( w == WinUser.WM_KEYUP || w == WinUser.WM_SYSKEYUP )
						System.out.println( "key up: vkCode = " + displayCode( lParam.vkCode )  );
				
				// 如果按下'q'退出程序，'q'的vkCode是81
				if ( lParam.vkCode == 81 ) {
					unhook();
					System.err.println( "program terminated." );
					System.exit( 0 );
				}
				return User32.INSTANCE.CallNextHookEx( keyboardHHK, nCode,
						wParam, lParam.getPointer() );
			}

			private char displayCode( int vkCode ) {
/*				if ( vkCode > 'a' && vkCode < 'z') {
					return "" + ( char ) vkCode;
				}
				if ( vkCode > 'A' && vkCode < 'Z') {
					return "" + ( char ) vkCode;
				}*/
				return (char ) vkCode ;
			}
		};
		
		mouseHook = new LowLevelMouseProc() {
			
			@Override
			// 该函数参数的意思参考：http://msdn.microsoft.com/en-us/library/windows/desktop/ms644986(v=vs.85).aspx
			public LRESULT callback( int nCode, WPARAM wParam,
					MOUSEHOOKSTRUCT lParam ) {
				switch ( wParam.intValue() ) {
					case WM_MOUSEMOVE:
						System.out.print( "mouse moved:" );
						break;
					case WM_LBUTTONDOWN:
						System.out.print( "mouse left button down:" );
						break;
					case WM_LBUTTONUP:
						System.out.print( "mouse left button up" );
						break;
					case WM_RBUTTONUP:
						System.out.print( "mouse right button up:" );
						break;
					case WM_RBUTTONDOWN:
						System.out.print( "mouse right button down:" );
						break;
					case WM_MOUSEWHEEL:
						System.out.print( "mouse wheel rotated:" );
						break;
				}
				System.out
						.println( "(" + lParam.pt.x + "," + lParam.pt.y + ")" );
				return User32.INSTANCE.CallNextHookEx( mouseHHK, nCode, wParam,
						lParam.getPointer() );
			}
		};
		
		System.out.println( "press 'q' to quit." );
		setHook();
		
		int result;
		MSG msg = new MSG();
		// 消息循环
		// 实际上while循环一次都不执行，这些代码的作用我理解是让程序在GetMessage函数这里阻塞，不然程序就结束了。
		while ( ( result = User32.INSTANCE.GetMessage( msg, null, 0, 0 ) ) != 0 ) {
			if ( result == -1 ) {
				System.err.println( "error in GetMessage" );
				unhook();
				break;
			} else {
				User32.INSTANCE.TranslateMessage( msg );
				User32.INSTANCE.DispatchMessage( msg );
			}
		}
		unhook();
	}
	
}