Windows中的JNA键盘钩

Question

我整理了一个JNA代码，用于在Windows中安装键盘挂钩（使用JNA示例）。代码编译完成，一切都安装了钩子（成功获得了钩子的句柄），也可以成功卸载了钩子。但是，当我按键盘上的任意键时，永远不会调用该回调。这是我的代码（其中大部分是从JNA示例获得的类型定义，对于我来说，直接转到“ main”）

import com.sun.jna.IntegerType;

import com.sun.jna.Pointer;

import com.sun.jna.PointerType;

import com.sun.jna.Structure;

import com.sun.jna.FromNativeContext;

import com.sun.jna.ptr.IntByReference;

import com.sun.jna.ptr.PointerByReference;

import com.sun.jna.win32.StdCallLibrary;

import com.sun.jna.win32.StdCallLibrary.StdCallCallback;

import com.sun.jna.Native;

import com.sun.jna.Platform;

import com.sun.jna.Library;

import com.sun.jna.win32.W32APITypeMapper;

import com.sun.jna.win32.W32APIFunctionMapper;

import java.util.Map;

import java.util.HashMap;

public class HelloWorld {

    static Map UNICODE_OPTIONS = new HashMap() {

        {

            put("type-mapper", W32APITypeMapper.UNICODE);

            put("function-mapper", W32APIFunctionMapper.UNICODE);

        }

    };

    public static class LONG_PTR extends IntegerType {

        public LONG_PTR() { this(0); }

        public LONG_PTR(long value) { super(Pointer.SIZE, value); }

    }

    public static class UINT_PTR extends IntegerType {

        public UINT_PTR() { super(Pointer.SIZE); }

        public UINT_PTR(long value) { super(Pointer.SIZE, value); }

        public Pointer toPointer() { return Pointer.createConstant(longValue()); }

    }

    public static class ULONG_PTR extends IntegerType {

        public ULONG_PTR() { this(0); }

        public ULONG_PTR(long value) { super(Pointer.SIZE, value); }

    }

    public static class LRESULT extends LONG_PTR {

        public LRESULT() { this(0); }

        public LRESULT(long value) { super(value); }

    }

    public static class WPARAM extends UINT_PTR {

        public WPARAM() { this(0); }

        public WPARAM(long value) { super(value); }

    }

    public static class LPARAM extends LONG_PTR {

        public LPARAM() { this(0); }

        public LPARAM(long value) { super(value); }

    }

过去，我已经使用C ++和C＃多次完成了键盘/鼠标挂钩。这是我第一次尝试Java，只是不知道是否正确导入和映射了库。有任何想法吗？

Answer 1

看样子你需要打电话GetMessage或者PeekMessage，这是奇怪的-这是不是说明文档中提到的钩子或LowLevelKeyboardProc。我对API的这一部分了解不足，无法猜测原因。我只是使用示例类：import com.sun.jna.examples.win32.*;public class Callback {  public static User32.HHOOK hHook;  public static User32.LowLevelKeyboardProc lpfn;  public static volatile boolean quit = false;  public static void main(String[] args) throws Exception {    W32API.HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null);    lpfn = new User32.LowLevelKeyboardProc() {      public W32API.LRESULT callback(int nCode, W32API.WPARAM wParam,          User32.KBDLLHOOKSTRUCT lParam) {        System.out.println("here");        quit = true;        return User32.INSTANCE.CallNextHookEx(hHook, nCode, wParam, lParam            .getPointer());      }    };    hHook = User32.INSTANCE.SetWindowsHookEx(User32.WH_KEYBOARD_LL, lpfn, hMod,        0);    if (hHook == null)      return;    User32.MSG msg = new User32.MSG();    while (!quit) {      User32.INSTANCE.PeekMessage(msg, null, 0, 0, 0);      Thread.sleep(100);    }    if (User32.INSTANCE.UnhookWindowsHookEx(hHook))      System.out.println("Unhooked");  }}

Answer 2

一个极简的例子：import com.sun.jna.platform.win32.Kernel32;import com.sun.jna.platform.win32.User32;import com.sun.jna.platform.win32.WinDef.HINSTANCE;import com.sun.jna.platform.win32.WinDef.LPARAM;import com.sun.jna.platform.win32.WinDef.LRESULT;import com.sun.jna.platform.win32.WinDef.WPARAM;import com.sun.jna.platform.win32.WinUser.HOOKPROC;public class MainTestKeyHook {    public static void main(String[] args) throws Exception {        HOOKPROC hookProc = new HOOKPROC_bg();        HINSTANCE hInst = Kernel32.INSTANCE.GetModuleHandle(null);        User32.HHOOK hHook = User32.INSTANCE.SetWindowsHookEx(User32.WH_KEYBOARD_LL, hookProc, hInst, 0);        if (hHook == null)            return;        User32.MSG msg = new User32.MSG();        System.err.println("Please press any key ....");        while (true) {            User32.INSTANCE.GetMessage(msg, null, 0, 0);        }       }}class HOOKPROC_bg implements HOOKPROC {    public HOOKPROC_bg() {    }    public LRESULT callback(int nCode, WPARAM wParam, LPARAM lParam) {        System.err.println("callback bbbnhkilhjkibh nCode: " + nCode);        return new LRESULT(0);    }}