keybd_event KEYEVENTF_EXTENDED需要键说明 [英] keybd_event KEYEVENTF_EXTENDEDKEY explanation required

问题描述

在文档中它说:

KEYEVENTF_EXTENDEDKEY (0x0001):如果指定，则在扫描代码之前加上前缀字节，其值为0xE0(224).

KEYEVENTF_EXTENDEDKEY (0x0001): If specified, the scan code was preceded by a prefix byte having the value 0xE0 (224).

有人可以解释这是什么意思吗?

Can someone explain what this means?

这有什么区别:

keybd_event(RIGHT, 0, 0, 0);
keybd_event(RIGHT, 0, 2, 0);

和这个:

keybd_event(RIGHT, 0, 1 | 0, 0);
keybd_event(RIGHT, 0, 1 | 2, 0);

因为当我执行这段代码时，我看不出没有区别吗?

because when I execute this code I can't see no difference?

此外，"byte bScan"的用途是什么?在描述中为:密钥的硬件扫描代码.那是什么意思?

Also, what is "byte bScan" for? In description it is: A hardware scan code for the key. What that means?

推荐答案

简单(且不完整)的解释是KEYEVENTF_EXTENDEDKEY的意思是此击键来自数字小键盘"

The simple (and incomplete) explanation is that KEYEVENTF_EXTENDEDKEY means "this keystroke is from the numeric keypad"

由于大多数程序的行为与在数字键盘(扩展键)上按"1"时在"q"键上方按"1"时的行为相同-通常，您不会期望看到在模拟键盘输入时设置此标志时没有任何区别.

Since most programs behave the same if you hit '1' above the 'q' key as they do when you hit '1' on the numeric keypad (which is an extended key) - you wouldn't normally expect to see any difference when you set this flag when simulating keyboard input.

注意键的位置的程序通常会对此标志做出响应.

Programs that pay attention to the location of a key will usually respond to this flag.

bScan值是原始硬件扫描代码.有关扫描代码的说明，请参见 http://en.wikipedia.org/wiki/Scancode .像扩展键标志一样，大多数程序都不关注扫描代码.如果程序希望将键盘视为一堆按钮，则可以使用这些值.

The bScan value is a raw hardware scancode. For an explanation of scancodes look here http://en.wikipedia.org/wiki/Scancode. Like the Extended key flag, most programs pay no attention to scancodes. The values are there in case the program wants to treat the keyboard as a bunch of buttons.

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