使用JNA消耗关键事件 [英] Using jna to consume key events
问题描述
在我正在编写的一个应用程序中，我需要消耗某些键事件，以便其他应用程序不对其进行处理.
In one of the applications I am writing i need to consume certain key events so other applications dont process them.
在我的代码中，我像这样制作com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc:
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);
}
}
当我在proc的末尾返回新的LRESULT(1)(末尾注释掉的代码)时，所有键盘事件都会被消耗.但是，当我用
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());
应当如此，并且仅尝试消耗我要消耗的主要键盘事件，而不消耗任何键盘事件.有谁知道为什么它不能让我消耗我想要的事件，或者不知道如何解决它?
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?
推荐答案
为了确保密钥已消耗"，您需要确保避免对所有调用下一个钩子(即返回LRESULT(1))给定密钥的事件变体，例如WM_KEYUP，WM_KEYDOWN以及可能的WM_CHAR.
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.
某些应用程序可能会查找键按下事件，其他应用程序会查找键按下事件，而其他一些应用程序只是为了生成字符输出，因此您必须使用与给定击键相关的 all 事件，以使所述击键正确进行"消失".
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".
这篇关于使用JNA消耗关键事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
