從Java中捕獲鼠標點擊並用作熱鍵？

Question

對於鍵盤，我用這個來捕獲鍵盤輸入：JIntellitype

這個作品非常好，但我也想捕捉鼠標事件（特別是點擊），並把它們作爲全球的「熱鍵」。

平臺只有Windows，語言是Java。我更喜歡一個不錯的Java包，並希望避免直接使用JNI/JNA調用或Win32（如果它們在一個很好的包裝中，這些都沒問題）。

Answer 1

如果你想使用JNA，你可以使用類似於下面的代碼。

使用JNA 3.3.0和JNA平臺JAR。

更多關於LowLevelMouseProc函數的doco here和鼠標事件here。

MouseHook.java：

package jnatest; 

import jnatest.WinUserX.LowLevelMouseProc; 
import jnatest.WinUserX.MSLLHOOKSTRUCT; 

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.MSG; 

public class MouseHook 
{ 
    private static volatile boolean quit; 
    private static HHOOK hhk; 
    private static LowLevelMouseProc mouseHook; 

    public static void main(String[] args) 
    { 
     System.out.println("Press middle button to quit."); 
     final User32 lib = User32.INSTANCE; 
     HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null); 
     mouseHook = new LowLevelMouseProc() 
     { 
      public LRESULT callback(int nCode, WPARAM wParam, MSLLHOOKSTRUCT info) 
      { 
       if (nCode >= 0) 
       { 
        switch (wParam.intValue()) 
        { 
         case WinUserX.WM_LBUTTONDOWN: 
          System.out.println("Left button click at " + info.pt.x + ", " + info.pt.y); 
          break; 
         case WinUserX.WM_LBUTTONUP: 
          System.out.println("Left button release."); 
          break; 
         case WinUserX.WM_MBUTTONDOWN: 
          System.out.println("Middle button."); 
          quit = true; 
          break; 
        } 
       } 
       return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer()); 
      } 
     }; 
     hhk = lib.SetWindowsHookEx(WinUser.WH_MOUSE_LL, mouseHook, hMod, 0); 
     new Thread() 
     { 
      public void run() 
      { 
       while (!quit) 
       { 
        try { Thread.sleep(10); } catch(InterruptedException e) { } 
       } 
       System.err.println("unhook and exit"); 
       lib.UnhookWindowsHookEx(hhk); 
       System.exit(0); 
      } 
     }.start(); 

     // This bit never returns from GetMessage 
     int result; 
     MSG msg = new MSG(); 
     while ((result = lib.GetMessage(msg, null, 0, 0)) != 0) 
     { 
      if (result == -1) 
      { 
       System.err.println("error in get message"); 
       break; 
      } 
      else 
      { 
       System.err.println("got message"); 
       lib.TranslateMessage(msg); 
       lib.DispatchMessage(msg); 
      } 
     } 
     lib.UnhookWindowsHookEx(hhk); 
    } 
}   

WinUserX.java：

package jnatest; 

import com.sun.jna.Structure; 
import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR; 
import com.sun.jna.platform.win32.WinDef.LRESULT; 
import com.sun.jna.platform.win32.WinDef.WPARAM; 
import com.sun.jna.platform.win32.WinUser; 

public interface WinUserX extends WinUser 
{ 
    public int WM_LBUTTONDOWN = 0x0201; 
    public int WM_LBUTTONUP = 0x0202; 
    public int WM_MOUSEMOVE = 0x0200; 
    public int WM_MOUSEWHEEL = 0x020A; 
    public int WM_MOUSEHWHEEL = 0x020E; 
    public int WM_RBUTTONDOWN = 0x0204; 
    public int WM_RBUTTONUP = 0x0205; 
    public int WM_MBUTTONDOWN = 0x0207; 

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

    public class MSLLHOOKSTRUCT extends Structure 
    { 
     public POINT pt; 
     public int mouseData; 
     public int flags; 
     public int time; 
     public ULONG_PTR dwExtraInfo; 
    } 
}