Absolute Time measure in milliseconds on pocket pc

Hi maghcc,
Why not calculate it by using both GetTickCount and GetSystemTime together?

David Maisonave (Axter)
Cheers!

Hi Export:

How to use them togother?

Does GetTickCount()  reterive the time elapsed since the system started?

Is like this ?

GetSystemTime() + GetTickCount()  ??


Thanks very much !


           Mag

If you are very particular then GetTickCount also is not going to work,.. Check out the implmentation for advanced tick count in this thread

https://www.experts-exchange.com/questions/20672393/Windows-System-Tick-Time-Resolution-Networking-Select-loop.html

~Hemanth

// initialization
startTime = GetSystemTime();

while(startTime == GetSystemTime());  // wait till time changes (second changes)

refTickCount = GetTickCount();             // get refernce tick count

// usage
tmTime = GetSystemTime();         // without ms

time_ms = (GetTickCount() - refTickCount) % 1000;  // modulo to get

tmTime2 = GetSystemTime();        

if(tmTime != tmTime2) { // has time hanged in the meantime ?
   time_ms = 0;
};

tmTime2.wMiliseconds += time_ms;

More or less

Should be:
tmTime2.wMiliseconds = time_ms;

or maybe better (if it works on your platform)

// initialization
startTime = GetSystemTime();

while(startTime == GetSystemTime());  // wait till time changes (second changes)

refTickCount = GetTickCount();             // get refernce tick count

// usage (simply add elapsed ms to startTime)
SystemTimeToFileTime(&startTime, &fileTime);

// * 10000 because FILETIME is expressed in 100 ns units
*(ULARGE_INTEGER *)&fileTime += (GetTickCount() - refTickCount) * 10000;  

FileTimeToSystemTime(&fileTime, &resTime);

Hi Expert:

I deeply appreciate your help.

But have one problem. Here is my code segment.

SYSTEMTIME startTime;
SYSTEMTIME secondTime;
DWORD refTickCount = 0;

// initialization
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) {
   GetSystemTime(&startTime);

    while (1){
        GetSystemTime(&secondTime);
        if ((startTime.wMinute != secondTime.wMinute) || (startTime.wSecond != secondTime.wSecond))
          break;
     }

     refTickCount = GetTickCount();             // get refernce tick count
   
     some code statements;
}


DWORD WINAPI DoWaitNotifThread(PVOID pArg)
{
     FILETIME fileTime;
     SYSTEMTIME resTime;

     // usage (simply add elapsed ms to startTime)
     SystemTimeToFileTime(&startTime, &fileTime);

    // * 10000 because FILETIME is expressed in 100 ns units
    *(ULARGE_INTEGER *)&fileTime += (GetTickCount() - refTickCount) * 10000;

    FileTimeToSystemTime(&fileTime, &resTime);

    SystemTimeToFileTime(&startTime, &fileTime);

}


Is FILETIME structure by declare in fileTime variables ?

If using FILETIME structure , I don't know what fields either dwLowDateTime or dwHighDateTime which be used?

Thanks very much!!

                 Mag

Thans so much!

             Mag