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http://blog.csdn.net/qq452626100/article/details/52398830
private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
if (nCode == HC_ACTION )
{
var kc = (KeyCode)(wParam+97-65);
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms644984(v=vs.85).aspx
int int32Param = lParam.ToInt32();
var repeat_count = (ushort) (int32Param& 0xFFFF); //0 - 15 The repeat count.The value is the number of times the keystroke is repeated as a result of the user's holding down the key.
var scan_code = (ushort)((int32Param& 0xFF0000)>>16); //16 - 23The scan code.The value depends on the OEM.
var extended_key = 0!= ((int32Param& 0x1000000)>>24); //24 Indicates whether the key is an extended key, such as a function key or a key on the numeric keypad.The value is 1 if the key is an extended key; otherwise, it is 0.
var reserved = (ushort)((int32Param& 0x1E000000)>>25); //25 - 28Reserved.
var context_code = 0!= ((int32Param& 0x20000000)>>29); //29The context code.The value is 1 if the ALT key is down; otherwise, it is 0.
var previous_key_state=0!= ((int32Param& 0x40000000)>>30); //30The previous key state.The value is 1 if the key is down before the message is sent; it is 0 if the key is up.
var transition_state= 0!= ((int32Param& 0x80000000)>>31);//31 The transition state. The value is 0 if the key is being pressed and 1 if it is being released.
if( !previous_key_state && !transition_state)//有键按下
{
Debug.Log ("钩子键盘按下："+kc);
}
else if( previous_key_state && transition_state)
{
Debug.Log ("钩子键盘抬起："+kc);
}
return 1;
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
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