使用jna消费按键事件
在我正在编写的应用程序之一中,我需要使用某些关键事件,以便其他应用程序不处理它们。
在我的代码中,我创建了一个 com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc ,如下所示:
import com.sun.jna.Native;
import com.sun.jna.platform.win32.Kernel32;
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.platform.win32.User32;
import com.sun.jna.platform.win32.WinUser;
public class KeyHook implements Runnable{
private static volatile boolean quit = false;
private static HHOOK hhk;
private static LowLevelKeyboardProc keyboardHook;
private Main main;
User32 lib;
HMODULE hMod;
public boolean isHooked = false;
public KeyHook(final Main main) {
this.main = main;
lib = User32.INSTANCE;
hMod = Kernel32.INSTANCE.GetModuleHandle(null);
Native.setProtected(true);
}
@Override
public void run() {
keyboardHook = new LowLevelKeyboardProc() {
public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT info) {
if (nCode >= 0 && main.getPane().getTabCount() > 0) {
switch (wParam.intValue()) {
case WinUser.WM_KEYUP:
if(info.vkCode == main.getListenMouse()){
main.listen();
return new LRESULT(1);
}
else if(info.vkCode == main.getStopListenMouse()){
main.stopListening();
return new LRESULT(1);
}
else if(info.vkCode == main.getStart()){
main.start();
return new LRESULT(1);
}
else if(info.vkCode == main.getPause()){
main.pause();
return new LRESULT(1);
}
else if(info.vkCode == main.getStop()){
main.stopRunning();
return new LRESULT(1);
}
else if(info.vkCode == 0x7B){
main.nextTab();
return new LRESULT(1);
}
break;
case WinUser.WM_KEYDOWN:
break;
case WinUser.WM_SYSKEYUP:
break;
case WinUser.WM_SYSKEYDOWN:
quit = true;
break;
}
}
return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
//return new LRESULT(1);
}
};
hhk = lib.SetWindowsHookEx(WinUser.WH_KEYBOARD_LL, keyboardHook, hMod, 0);
}
}
当我在过程末尾返回一个新的 LRESULT(1) 时(在末尾注释掉代码),所有键盘事件都是消耗了。但是,当我将其替换为
return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
应有的样子,并且仅尝试消耗我想要消耗的主键盘事件时,它不会消耗任何键盘事件。有谁知道为什么它不允许我消费我想要的事件,或者知道如何修复它,这样它就会发生?
In one of the applications I am writing i need to consume certain key events so other applications dont process them.
In my code i make a com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc like so:
import com.sun.jna.Native;
import com.sun.jna.platform.win32.Kernel32;
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.platform.win32.User32;
import com.sun.jna.platform.win32.WinUser;
public class KeyHook implements Runnable{
private static volatile boolean quit = false;
private static HHOOK hhk;
private static LowLevelKeyboardProc keyboardHook;
private Main main;
User32 lib;
HMODULE hMod;
public boolean isHooked = false;
public KeyHook(final Main main) {
this.main = main;
lib = User32.INSTANCE;
hMod = Kernel32.INSTANCE.GetModuleHandle(null);
Native.setProtected(true);
}
@Override
public void run() {
keyboardHook = new LowLevelKeyboardProc() {
public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT info) {
if (nCode >= 0 && main.getPane().getTabCount() > 0) {
switch (wParam.intValue()) {
case WinUser.WM_KEYUP:
if(info.vkCode == main.getListenMouse()){
main.listen();
return new LRESULT(1);
}
else if(info.vkCode == main.getStopListenMouse()){
main.stopListening();
return new LRESULT(1);
}
else if(info.vkCode == main.getStart()){
main.start();
return new LRESULT(1);
}
else if(info.vkCode == main.getPause()){
main.pause();
return new LRESULT(1);
}
else if(info.vkCode == main.getStop()){
main.stopRunning();
return new LRESULT(1);
}
else if(info.vkCode == 0x7B){
main.nextTab();
return new LRESULT(1);
}
break;
case WinUser.WM_KEYDOWN:
break;
case WinUser.WM_SYSKEYUP:
break;
case WinUser.WM_SYSKEYDOWN:
quit = true;
break;
}
}
return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
//return new LRESULT(1);
}
};
hhk = lib.SetWindowsHookEx(WinUser.WH_KEYBOARD_LL, keyboardHook, hMod, 0);
}
}
When I return a new LRESULT(1) at the end of my proc (commented out code at the end), all keyboard events are consumed. However, when i replace it with
return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
as it should be, and only try to consume the main keyboard events i want to consume, it doesn't consume any of the keyboard events. Does anyone have any idea of why it won't let me consume the events I want or have any idea how to fix it so it will?
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为了确保某个键被“使用”,您需要确保避免在给定键的所有事件变体(即 WM_KEYUP、WM_KEYDOWN 和可能的 WM_CHAR)上调用下一个挂钩(即返回 LRESULT(1))。
某些应用程序可能会查找按键按下事件,其他应用程序可能会查找按键按下事件,而其他应用程序可能只是查找生成的字符输出,因此您必须消耗与给定击键相关的所有事件以使所述击键正确“消失”。
In order to ensure that a key is "consumed", you need to ensure that you avoid calling the next hook (i.e. return LRESULT(1)) on all event variants of a given key, i.e. WM_KEYUP, WM_KEYDOWN, and possibly WM_CHAR.
Some applications may look for key up events, others for key down, and others simply for the produced character output, so you must consume all events related to a given keystroke to make said keystroke properly "disappear".