函数功能:该函数检取指定虚拟键的状态。该状态指定此键是UP状态,DOWN状态,还是被触发的(开关每次按下此键时进行切换)。
1 |
SHORT GetKeyState(int nVirtKey); |
函数:
nVrtKey:定义一虚拟键。若要求的虚拟键是字母或数字(A~Z,a~z或0~9),nVirtKey必须被置为相应字符的ASCII码值,对于其他的键,nVirtKey必须是一虚拟键码。若使用非英语键盘布局,则取值在ASCIIa~z和0~9的虚拟键被用于定义绝大多数的字符键。例如,对于德语键盘格式,值为ASCII0(OX4F)的虚拟键指的是”0″键,而VK_OEM_1指”带变音的0键”
返回值:返回值给出了给定虚拟键的状态,状态如下:
若高序位为1,则键处于DOWN状态,否则为UP状态。
若低序位为1,则键被触发。例如CAPS LOCK键,被找开时将被触发。若低序位置为0,则键被关闭,且不被触发。触发键在键盘上的指示灯,当键被触发时即亮,键不被触发时即灭。
备注:当给定线程从它的消息队列中读键消息时,该函数返回的键状态发生改变。该状态井不反映与硬件相关的中断级的状态。使用SetKeyboardState可获取这一信息。
欲检取所有虚拟键状态信息,可以使用SetKeyboardState函数。
应用程序可以使用虚拟键码常数VK_SHIFT,VK_CONTROL和VK_MENU作为nVirtKey参数的值。它给出shift,ctrl或alt键的值而不区分左右键,应用程序也可以使用如下的虚拟键码常数作nVirtKey的值来区分前述键的左键、右键的情形。
VK_LSHIFT,VK_RSHIFT;VK_LCONTROL,VK_RCONTROL;VK_LMENU,VK_RMENU
仅当应用程序调用GetKeyboardSlate,SetKeyboardState,GetAsyncKeystate;GetKeyState和MapVirtualKey函数时,才可用这些区分左右键的常数。
Windows CE:GetKeyState函数仅能用于检查如下虚拟键的DOWN状态。
VK_LSHIFT,VKRSHIFT,VK_LCONTROL;VK_RCONTROL;VK_LMENU,VK_RMENU
GetKeyState函数只能用于检查VK_CAPITAL虚拟键的触发状态。
速查:Windows NT:3.1及以上版本;Windows:95及以上版本;Windows CE:1.I及以上版本;头文件:winuser.h;库文件:user32.lib。
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