delphi vista setlocaltime: delphi, kernel32, setlocaltime, vista

delphi vista setlocaltime

Hi,
I've built a browser shell for a group of clients which runs on vista using a stardard manifest. All settings saved in user appdata folder. This needs to be non admin application in order to start as shell, because vista wont allow admin applications to startup as shell or run when set to start as admin.

My issue is, this program gets a date/time from a server, so the date and time on all machines involved is the same. I'm using the setlocaltime call, but in vista this dosnt work, and returns false.

Is there another mathod to set the local machine time on vista that will work, without messing with uac or manifest files?

Regards,
Allan.

function setsystemtime(timestamp:tdatetime):boolean;
var
  SystemTime: TSystemTime;
begin
  DateTimeToSystemTime(timestamp, SystemTime);
  result:= SetLocalTime(SystemTime);
  PostMessage(HWND_BROADCAST, WM_TIMECHANGE, 0, 0);
end;

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Here is some code I found in the Codegear newsgroups, modified according to the thread.

function SetPCSystemTime (dt:TDateTime) :Boolean;
const
  se_systemtime_name = 'SeSystemtimePrivilege';
var
  st :TSystemTime;
  hToken: THandle;
  ReturnLength: DWORD;
  tkp, PrevTokenPriv: TTokenPrivileges;
  luid: TLargeInteger;
begin
  Result := False;
  if (YearOf(dt) < 2008) then Exit;  // for prudence :)
  if (Win32Platform = ver_platform_win32_nt) then
  begin
    if OpenProcessToken (GetCurrentProcess, token_adjust_privileges or token_query, hToken) then
    begin
      try
        if not LookupPrivilegeValue (nil, se_systemtime_name, luid) then Exit;
 
        tkp.PrivilegeCount := 1;
        tkp.Privileges[0].luid := luid;
        tkp.Privileges[0].Attributes := se_privilege_enabled;
 
        // if not AdjustTokenPrivileges (hToken, False, tkp, SizeOf(TTokenPrivileges), PrevTokenPriv, ReturnLength) then Exit;
        if not AdjustTokenPrivileges (hToken, False, tkp, 0, PTokenPrivileges(nil)^, PDWORD(nil)^) then Exit;
        
        {After adjusting the time, you really should restore the privileges to what they were.}
 
        if (GetLastError <> error_success) then raise Exception.Create (SysErrorMessage (GetLastError));
      finally
        CloseHandle (hToken);
      end;
    end;
  end;
  DateTimeToSystemTime (dt, st);
  Result := Windows.SetLocalTime (st);
end;

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delphi vista setlocaltime

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delphi

kernel32

setlocaltime

vista

Delphi Curiosities

Delphi Programming

Windows Vista

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