java 监听 键盘 全局

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();
    }

}