Idle time of an application

how to calculate idle time of an application in mfc.

If an application session has been idle for more than 15 minutes how to re-authenticate 开发者_运维问答session.

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You need the "GetLastInputInfo" API.

UINT GetIdleMS()
{
   LASTINPUTINFO li = { 0 };
   li.cbSize        = sizeof(LASTINPUTINFO);
   GetLastInputInfo(&li);
   return GetTickCount() - li.dwTime;
}