void GetKeyboardState(lpKeyState)
This function copies the status of the 256 virtual-keyboard keys to the buffer specified by the lpKeyState parameter. The high bit of each byte is set to 1 if the key is down, or it is set to 0 if it is up. The low bit is set to 1 if the key was pressed an odd number of times since startup. Otherwise, it is set to 0.
| Parameter | Type/Description | |
| lpKeyState | BYTE FAR * Points to the 256-byte buffer of virtual-key codes. |
None.
An application calls the GetKeyboardState function in response to a keyboard-input message. This function retrieves the state of the keyboard when the input message was generated.
To obtain state information for individual keys, follow these steps:
1.Create an array of characters that is 265 bytes long.
2.Copy the contents of the buffer pointed to by the lpKeyState parameter into the array.
3.Use the virtual-key code from the Appendix, “Virtual-Key Codes,” to obtain an individual key state.