Monitoring the input of the barcode scanner may result in partial data loss

[YiXiXiao]

Hi, When I am using the jcef framework to develop Windows desktop programs, I use jnativehook to listen to the barcode scanner and keyboard input. When I use the barcode scanner to continuously and quickly scan the code, there may be a shortage of execution of the NativeKeyListener callback method. For example, barcode 6901028240410 has a total of 13 digits, but nativeKeyTyped only executes 12 times, resulting in outputs of 6, 9, 0, 1, 2, 8, 2, 4, 0, 4, 1, 0. My program is as follows:

private void registerScanListener() { try { scanLogger.setLevel(java.util.logging.Level.OFF); GlobalScreen.setEventDispatcher(new SwingDispatchService()); GlobalScreen.registerNativeHook(); } catch (NativeHookException e) { e.printStackTrace(); }

    GlobalScreen.addNativeKeyListener(new NativeKeyListener() {
        @Override
        public void nativeKeyTyped(NativeKeyEvent nativeKeyEvent) {
          if (Character.isLetterOrDigit(nativeKeyEvent.getKeyCode())) {
              System.out.println(NativeKeyEvent.getKeyText(nativeKeyEvent.getKeyCode()));
          }
        }

        @Override
        public void nativeKeyPressed(NativeKeyEvent nativeKeyEvent) {

        }

        @Override
        public void nativeKeyReleased(NativeKeyEvent nativeKeyEvent) {

        }
    });
}

[kwhat]

I believe this is resolved in the . 3 relase, but I don't have a build yet.

[kwhat]

If you look at the debug log, do you get a message about restarting the hook?

[YiXiXiao]

If you look at the debug log, do you get a message about restarting the hook?

I'm very sorry, I haven't found any logs related to hook restart, and this issue may only occur when scanning quickly and continuously.

When will version. 3 be available?

Thank you very much!

[liaoliang]

barcode input type may lose charactor， how to solve