🚀 go-pugleaf

Hi,

Original question was in <language cpp>, but it was suggested to post 
this question here. So here it is again. Sorry for the inconvenience.

I am writing a PVCR program to schedule recording of TV shows, and I 
want the computer to allow the Standby mode between recordings. I am 
using waitable timers in order to wake up the computer before every new 
recording, but that doesn't happen. I can see that the waitable timer 
functions, because my program receives it's signal at the correct time, 
as long as the computer does not go into standby. But I want my computer 
to wake from standby too.

I have written the following code snippet, that I have found browsing 
the net, and adapted to my needs:

SYSTEMTIME sTimeCurrent, sTimeRecord;

GetLocalTime(&sTimeCurrent);
sTimeRecord = sTimeCurrent;
sTimeRecord.wMinute += 1; //Wake up after one minute for this test case
//Convert to a FILETIME
FILETIME fLocalTime;
SystemTimeToFileTime(&sTimeRecord,&fLocalTime);

//Convert from local time to UTC time
//since the system works on UTC internally.
FILETIME fTime;
LocalFileTimeToFileTime(&fLocalTime,&fTime);

//Put time into a LARGE_INTEGER structure
//for the SetWaitableTimer function
LARGE_INTEGER liDueTime;

liDueTime.HighPart = fTime.dwHighDateTime;
liDueTime.LowPart = fTime.dwLowDateTime;

//Create the WaitableTimer
HANDLE hTimer = CreateWaitableTimer(NULL,TRUE,"VideoTimer");

if( hTimer != NULL )
{
   CancelWaitableTimer( hTimer );
   //Set the timer with the required time. Set the last
   //parameter to true to wake up the computer if asleep
   if( SetWaitableTimer(hTimer, &liDueTime, 0, NULL, NULL, true ))
   {
     StandbyPanel->Caption = "Timer has been set!";

     //* This executes a thread that uses
     //* WaitForSingleObject( hTimer, 90000 );
     //* It either updates the StandbyPanel with the current DateTime
     //* or gives a failure message after the 90 seconds timeout
     mWaitingTest.mExecuteThread( new( HERE ) CWaitingThread( hTimer ));
     //* In this example the Panel shows the date time after one minute
     //* Thus the signal is received by the thread

     //* Set the system to standby and it should wake after 1 minute
     SleepEx( 1000, false );
     StandbyPanel->Caption = "Going to sleep now!";
     //* Here I initiate the Standby mode
     //* But when I enable this the computer does not wake at
     //* the desired time of one minute
//  SetSuspendState( FALSE, FALSE, FALSE );
   }
   else
   {
     StandbyPanel->Caption = "Failed to set Timer!";
   }
}
else
{
   StandbyPanel->Caption = "Failed to create Timer!";
}


What am I missing here? As far as I know this piece of code should work, 
but is there something else that has to be done to wake up the computer?

Thanks in advance.

Wiljo.