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int = GetKeyState(key) Retrieves the status of the specified key.
Parameterskey : int
Specifies a virtual key. If the desired virtual key is a letter or digit (A through Z, a through z, or 0 through 9), key must be set to the ASCII value of that character. For other keys, it must be a virtual-key code.Comments
The key status returned from this function changes as a given thread
reads key messages from its message queue. The status does not reflect the
interrupt-level state associated with the hardware. Use the win32api::GetAsyncKeyState method to retrieve that information.
Win32 API ReferencesGetKeyState
Return ValueThe return value specifies the status of
the given virtual key. 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.
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