C++ 获取键盘大小写状态

Windows GetKeyState 函数详解

最新推荐文章于 2025-10-18 00:15:00 发布

转载最新推荐文章于 2025-10-18 00:15:00 发布 · 1.6k 阅读

本文详细介绍了Windows API中的GetKeyState函数，该函数用于获取指定虚拟键的状态，包括按键是否按下、是否切换等。文章解释了参数nVirtKey的使用方法，以及返回值的含义，适用于使用非英语键盘布局的情况。

SHORT GetKeyState(
  int nVirtKey
);

Parameters

nVirtKey

Type: int

A virtual key. If the desired virtual key is a letter or digit (A through Z, a through z, or 0 through 9), nVirtKey must be set to the ASCII value of that character. For other keys, it must be a virtual-key code.

If a non-English keyboard layout is used, virtual keys with values in the range ASCII A through Z and 0 through 9 are used to specify most of the character keys. For example, for the German keyboard layout, the virtual key of value ASCII O (0x4F) refers to the "o" key, whereas VK_OEM_1 refers to the "o with umlaut" key.

Return Value

Type: SHORT

The return value specifies the status of the specified virtual key, as follows:

If the high-order bit is 1, the key is down; otherwise, it is up.
If the low-order bit is 1, the key is toggled. A key, such as the CAPS LOCK key, is toggled if it is turned on. The key is off and untoggled if the low-order bit is 0. A toggle key's indicator light (if any) on the keyboard will be on when the key is toggled, and off when the key is untoggled.

https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-getkeystate