jna笔记备份

需要下载 jna.jar 和 platform.jar V4.1.0（参考http://my.oschina.net/penngo/blog/12356）：

package jna_test;import com.sun.jna.platform.win32.*;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.KBDLLHOOKSTRUCT;import com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc;import com.sun.jna.win32.WinUser.Mouse.LowLevelMouseProc;import com.sun.jna.win32.WinUser.Mouse.MOUSEHOOKSTRUCT;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 = "+lParam.vkCode);                else if(w==WinUser.WM_KEYUP || w==WinUser.WM_SYSKEYUP)                    System.out.println("key up: vkCode = "+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());            }        };        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();    }   }

2.

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.WinDef.LRESULT;import com.sun.jna.platform.win32.WinDef.WPARAM;import com.sun.jna.platform.win32.WinUser.HOOKPROC;import com.sun.jna.platform.win32.WinUser.POINT;interface LowLevelMouseProc extends HOOKPROC {    LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam);}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;}