为什么一些KeyEvent键码抛出“IllegalArgumentException：无效的密钥代码”？ [英] Why are some KeyEvent keycodes throwing "IllegalArgumentException: Invalid key code"?

问题描述

我正在尝试使用 Robot 自动执行某些进程，并且在<$ c $中似乎是某些密钥代码（只有在正常输入时才需要保留shift的符号） c> KeyEvent 抛出 IllegalArgumentException 。这是在 main 中运行的所有代码：

I'm trying to automate some processes using Robot and it seems certain keycodes (only symbols that require you to hold shift when typing it normally) in KeyEvent are throwing an IllegalArgumentException. This is all the code that's running in main:

Robot r = new Robot();
r.keyPress(KeyEvent.VK_EXCLAMATION_MARK);

但是，使用以下解决方法可以正常工作：

However, it works fine using the following workaround:

Robot r = new Robot();
r.keyPress(KeyEvent.VK_SHIFT);
r.keyPress(KeyEvent.VK_1);

为什么抛出异常的想法？谢谢！

Any ideas why the exception is thrown? Thanks!

Java版本：1.6.0_23

Java version: 1.6.0_23

推荐答案

因为喜欢 Robot.keyPress 的文档说， keycode IllegalArgumentException c $ c>不代表有效密钥， VK_EXCLAMATION_MARK 不是有效密钥。

Because like the documentation for Robot.keyPress says, an IllegalArgumentException is thrown when the keycode doesn't represent a valid key, and VK_EXCLAMATION_MARK is not a valid key.

密钥代码是用于表示两件事：键盘上的键和键入字符事件。键入一个字符通常需要多个按键（按顺序，或同时，或两者）。但 Robot.keyPress 模拟按键的行为（因此名称），而不是键入字符的行为。

Keycodes are used to represent two things: keys on the keyboard, and "a character was typed" events. Typing a character often requires more than one keypress (in sequence, or simultaneously, or both). But Robot.keyPress simulates the act of pressing a key (hence the name), not the act of typing a character.

有关详细信息，请参阅KeyEvent的文档： http：/ /download.oracle.com/javase/6/docs/api/java/awt/event/KeyEvent.html

For more information, see the documentation for KeyEvent: http://download.oracle.com/javase/6/docs/api/java/awt/event/KeyEvent.html

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