JNA键盘钩在Windows中

我已经在Windows上安装了一个JNA代码来安装键盘钩子（使用JNA的例子）。 代码编译和一切，我得到安装的钩子（我成功处理钩），我也可以卸载钩成功。 但是，当我按下键盘上的任何键时，回叫将永远不会被调用。 这里是我的代码（大部分是从JNA例子中获得的types定义，直接到我的部分去“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); } } public static class KBDLLHOOKSTRUCT extends Structure { public int vkCode; public int scanCode; public int flags; public int time; public ULONG_PTR dwExtraInfo; } static HANDLE INVALID_HANDLE_VALUE = new HANDLE() { { super.setPointer(Pointer.createConstant(-1)); } public void setPointer(Pointer p) { throw new UnsupportedOperationException("Immutable reference"); } }; public static class HANDLE extends PointerType { public Object fromNative(Object nativeValue, FromNativeContext context) { Object o = super.fromNative(nativeValue, context); if (INVALID_HANDLE_VALUE.equals(o)) return INVALID_HANDLE_VALUE; return o; } } public static class HHOOK extends HANDLE { } public static class HINSTANCE extends HANDLE { } public static class HMODULE extends HINSTANCE { } public interface User32 extends StdCallLibrary { User32 INSTANCE = (User32)Native.loadLibrary("user32", User32.class, UNICODE_OPTIONS); static final int WH_KEYBOARD_LL = 13; public static interface HOOKPROC extends StdCallCallback { LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT lParam); } HHOOK SetWindowsHookEx(int idHook, HOOKPROC lpfn, HMODULE hMod, int dwThreadId); LRESULT CallNextHookEx(HHOOK idHook, int nCode, WPARAM wParam, LPARAM lParam); LRESULT CallNextHookEx(HHOOK idHook, int nCode, WPARAM wParam, Pointer lParam); boolean UnhookWindowsHookEx(HHOOK idHook); } public interface Kernel32 extends StdCallLibrary { Kernel32 INSTANCE = (Kernel32)Native.loadLibrary("kernel32", Kernel32.class, UNICODE_OPTIONS); HMODULE GetModuleHandle(String name); } public static HHOOK hHook; public static User32.HOOKPROC lpfn; public static volatile boolean quit = false; public static void main(String[] args) throws Exception { HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null); System.out.println(hMod); lpfn = new User32.HOOKPROC() { public LRESULT callback(int nCode, WPARAM wParam, 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); System.out.println(hHook); if(hHook != null) System.out.println("Keyboard hooked, type anything to quit"); while(!quit) { Thread.sleep(100); } if(User32.INSTANCE.UnhookWindowsHookEx(hHook)) System.out.println("Unhooked"); } } 

过去，我使用C ++和C＃多次完成键盘/鼠标钩子。 这是我第一次尝试使用Java，而我只是不知道我是否正确导入和映射库。 有任何想法吗？

谢谢。

Answer 1

看来你需要调用GetMessage或PeekMessage ，这是奇怪的 – 它没有在Hooks或LowLevelKeyboardProc的文档中提到。 我不太了解API的这部分内容，猜测原因。

我只是使用了示例类：

 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

一个简约的例子：

 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); } }