WinAPI: How to get the caps lock state?

问题:

How can get whether Caps Lock is on or off? I tried to search it but all I'm finding is how to toggle or turn it on/off which is exactly opposite of what I'm looking for.

I'm trying to do that in both C++ and Delphi.
Please help

回答1:

You want the GetKeyState() function:

http://msdn.microsoft.com/en-us/library/ms646301(VS.85).aspx

with the VK_CAPITAL key code. Rest of the virtual key codes are here:

http://technet.microsoft.com/en-us/subscriptions/index/dd375731(v=vs.85).aspx

回答2:

I found this link and the code snippet below that might help you

if ((GetKeyState(VK_CAPITAL) & 0x0001)!=0)
  AfxMessageBox("Caps Lock ON!");
else
  AfxMessageBox("Caps Lock OFF!");

回答3:

Use GetAsyncKeyState with VK_CAPITAL (0x14)