GetTimeZoneInformation function

[Guest_imported]

Can someone show me how to use the GetTimeZoneInformation function???

 

[2ffat]

Try this or something similar:

TZId = GetTimeZoneInformation((LPTIME_ZONE_INFORMATION) &TimeZoneInformation );

switch (TZId)
{
    case TIME_ZONE_ID_UNKNOWN:
         // Do something
         break;

     case TIME_ZONE_ID_STANDARD:
           // Do something
           break;

      case TIME_ZONE_ID_DAYLIGHT:
            // Do something
            break;

       default:
           //
           // Something is wrong with the time zone information.  Fail
           // the logon request.
           //

           NtStatus = STATUS_INVALID_LOGON_HOURS;
           break;
}

if (NT_SUCCESS(NtStatus))
{
    // Do something 
}

James P. Cottingham

I am the Unknown lead by the Unknowing.
I have done so much with so little
for so long that I am now qualified
to do anything with nothing.

 

[Guest_imported]

Thanks James for the code,

The complier didn't like the: TZId = GetTimeZoneInformation((LPTIME_ZONE_INFORMATION) &TimeZoneInformation );

Error being: Undefined symbol 'TimeZoneInformation'. and the Switch(TZId)line gave the error: Switch selection expression must be of integral type..

I didn't use any of the NtStatus lines as these were causing problems.

Your code with the Switch() is exactly what I want so I can run a program depending if it is daylight savings or not.

Can you see why the lines, TZId = GetTimeZoneInformation((LPTIME_ZONE_INFORMATION) &TimeZoneInformation ); and the Switch(TZId) would not work??

 

[2ffat]

My mistake, I forgot to define the variables. According to the sample code I have, you will need to define the following varaibles:

TIME_ZONE_INFORMATION TimeZoneInformation;
NTSTATUS NTStatus=STATUS_SUCCESS;
DWORD TZId;

TimeZoneInformation points to the structure of TIME_ZONE_INFORMATION. NTStatus has a type of NTSTATUS with an initial value of STATUS_SUCCESS. TZId is a double word. Hope this helps.
James P. Cottingham

I am the Unknown lead by the Unknowing.
I have done so much with so little
for so long that I am now qualified
to do anything with nothing.

 

[Guest_imported]

The only prob now is the NTSTATUS NTStatus=STATUS_SUCCESS;

I use BCB3 Standard... is NTSTATUS a declaration/function for a higher version of BCB?

 

[2ffat]

NTSTATUS should be part of MFC. It's not part of BCB. You can probably find another way to code this if you are desperate.
James P. Cottingham

I am the Unknown lead by the Unknowing.
I have done so much with so little
for so long that I am now qualified
to do anything with nothing.