/// <summary>
/// Use the Initialize method with the gmtOffset parameter
/// to create a list of timezones which have a specific
/// offset value. For example, for all timezones at
/// GMT-5:00, pass -300 (minutes). To get all of the time
/// zones known to the OS, pass ALL_TIMEZONES_LIST or call
/// the method with no parameters.
/// </summary>
/// <param name="gmtOffset">Offset of the target timezones
/// from GMT (in minutes).</param>
public void Initialize( int gmtOffset )
{
TimeZoneInformation mTimeZoneInformation = new OpenNETCF.Win32.TimeZoneInformation();
// On Windows CE 3.0 other than Pocket PC, we can scan
// the registry for a list of timezones.
// HKLM\Time Zones is the root. Under this root are all
// of the timezone entries that the system knows about.
// The name of each key for a timezone entry is the
// 'standard time' description for the timezone (Eastern
// Standard Time, for example). Under this key are various
// values:
// Display - The name of the timezone for display purposes.
// This value includes the offset from GMT, as well as the
// name, in some form, of the timezone.
// Dlt - The name of the timezone for the 'daylight time'
// part of the year (Eastern Daylight Time, for example).
// TZI - A binary structure, like TIME_ZONE_INFORMATION,
// describing the characteristics of the timezone.
// Scan through the registry, looking for the indicated
// timezone offset from GMT in the display string. When
// we find it, we add it to a list, since there might
// be several matches (Arizona and normal MST would both
// match GMT-7, for example).
if (!System.IO.File.Exists("\\windows\\citydb.dll"))//OpenNETCF.EnvironmentEx.PlatformName.IndexOf("Pocket")==-1)
{
RegistryKey baseKey;
baseKey = Registry.LocalMachine.OpenSubKey("Time Zones", false);
if ( baseKey != null )
{
// Enumerate all keys under the base timezone key.
//string cls;
string[] subkeynames = baseKey.GetSubKeyNames();
foreach(string thiskeyname in subkeynames)
{
// Open the enumerated key.
RegistryKey tzKey = baseKey.OpenSubKey(thiskeyname, false);
if ( tzKey != null )
{
// Get the display name value for the timezone.
string dispName;
dispName = tzKey.GetValue("Display").ToString();
if(dispName != null)
{
// Extract the offset from GMT from the display string.
// The basic format of the string is:
// (GMT-%02d:%02d) <Name>
// The problem is when you are *at* GMT, where the sign
// and the numbers aren't present.
int hoursOffset = 999, minutesOffset = 999;
string hours;
string minutes;
hours = dispName.Substring( 4, 3 );
minutes = dispName.Substring( 8, 2 );
// For the case of GMT itself, there is no
// offset in the display name, so we
// set the offset to zero, in that case.
if ( ( hours[ 0 ] == '-' ) ||
( hours[ 0 ] == '+' ) )
{
hoursOffset = System.Int32.Parse( hours );
minutesOffset = System.Int32.Parse( minutes );
}
else
{
hoursOffset = 0;
minutesOffset = 0;
}
// Compute the timezone's total offset in minutes
int offset = hoursOffset * 60;
if ( hoursOffset < 0 )
{
offset -= minutesOffset;
}
else
{
offset += minutesOffset;
}
// We now have a value which we can compare to the
// value that the user gave us.
if ( ( gmtOffset == offset ) ||
( gmtOffset == ALL_TIMEZONES_LIST ) )
{
// Match. Add timezone to list. So far, we have
// the standard time name and the display name.
// We still need to get the DST name and the
// TIME_ZONE_INFORMATION.
string dstName;
dstName = tzKey.GetValue("Dlt").ToString();
// Read the time zone information from the
// registry. Unfortunately, this is something
// that only the Control Panel code actually
// knows about, so, if they change it, we break.
TZREG tzr = new TZREG();
int tzrSize = tzr.ToByteArray().Length;
TimeZoneInformation tzi = new TimeZoneInformation();
byte[] btzr;
btzr = (byte[])tzKey.GetValue("TZI");
tzr = new TZREG( btzr );
tzi.Bias = tzr.Bias;
tzi.StandardBias = tzr.StandardBias;
tzi.DaylightBias = tzr.DaylightBias;
tzi.StandardDate = tzr.StandardDate;
tzi.DaylightDate = tzr.DaylightDate;
// Don't forget to copy the standard name and
// daylight name to the structure.
tzi.DaylightName = dstName;
tzi.StandardName = thiskeyname;
// Copy the display name from the registry to
// the class.
tzi.DisplayName = dispName;
this.Add( tzi );
}
}//endif dispname null
// close the timezone key.
tzKey.Close();
}//endif tzkey null
}//end foreach subkeynames
// Close the key.
baseKey.Close();
}
}
else
{
//Pocket PC
InitCityDb();
ClockLoadAllTimeZoneData();
int nZones = ClockGetNumTimezones();
//tzData = new TZData[nZones];
for( int i = 0; i < nZones; i++ )
{
IntPtr p = ClockGetTimeZoneDataByOffset(i);
TZData tmp= new TZData(p);
if ( ( gmtOffset == tmp.GMTOffset ) ||
( gmtOffset == ALL_TIMEZONES_LIST ) )
{
TimeZoneInformation tzi = new TimeZoneInformation();
tzi.Bias = tmp.GMTOffset;
tzi.DaylightBias =tmp.DSTOffset;
// tzi.StandardDate = tzr.StandardDate;
// tzi.DaylightDate = tzr.DaylightDate;
// Don't forget to copy the standard name and
// daylight name to the structure.
tzi.DaylightName = tmp.DSTName;
tzi.StandardName = tmp.Name;
// Copy the display name from the registry to
// the class.
tzi.DisplayName = tmp.ShortName;
this.Add(tzi);
}
}
ClockFreeAllTimeZoneData();
UninitCityDb();
}
}
/// <summary>
/// Use the Initialize method with the gmtOffset parameter
/// to create a list of timezones which have a specific
/// offset value. For example, for all timezones at
/// GMT-5:00, pass -300 (minutes). To get all of the time
/// zones known to the OS, pass ALL_TIMEZONES_LIST or call
/// the method with no parameters.
/// </summary>
/// <param name="gmtOffset">Offset of the target timezones
/// from GMT (in minutes).</param>
public void Initialize(int gmtOffset)
{
TimeZoneInformation mTimeZoneInformation = new OpenNETCF.Win32.TimeZoneInformation();
// On Windows CE 3.0 other than Pocket PC, we can scan
// the registry for a list of timezones.
// HKLM\Time Zones is the root. Under this root are all
// of the timezone entries that the system knows about.
// The name of each key for a timezone entry is the
// 'standard time' description for the timezone (Eastern
// Standard Time, for example). Under this key are various
// values:
// Display - The name of the timezone for display purposes.
// This value includes the offset from GMT, as well as the
// name, in some form, of the timezone.
// Dlt - The name of the timezone for the 'daylight time'
// part of the year (Eastern Daylight Time, for example).
// TZI - A binary structure, like TIME_ZONE_INFORMATION,
// describing the characteristics of the timezone.
// Scan through the registry, looking for the indicated
// timezone offset from GMT in the display string. When
// we find it, we add it to a list, since there might
// be several matches (Arizona and normal MST would both
// match GMT-7, for example).
if (!System.IO.File.Exists("\\windows\\citydb.dll")) //OpenNETCF.EnvironmentEx.PlatformName.IndexOf("Pocket")==-1)
{
RegistryKey baseKey;
baseKey = Registry.LocalMachine.OpenSubKey("Time Zones", false);
if (baseKey != null)
{
// Enumerate all keys under the base timezone key.
//string cls;
string[] subkeynames = baseKey.GetSubKeyNames();
foreach (string thiskeyname in subkeynames)
{
// Open the enumerated key.
RegistryKey tzKey = baseKey.OpenSubKey(thiskeyname, false);
if (tzKey != null)
{
// Get the display name value for the timezone.
string dispName;
dispName = tzKey.GetValue("Display").ToString();
if (dispName != null)
{
// Extract the offset from GMT from the display string.
// The basic format of the string is:
// (GMT-%02d:%02d) <Name>
// The problem is when you are *at* GMT, where the sign
// and the numbers aren't present.
int hoursOffset = 999, minutesOffset = 999;
string hours;
string minutes;
hours = dispName.Substring(4, 3);
minutes = dispName.Substring(8, 2);
// For the case of GMT itself, there is no
// offset in the display name, so we
// set the offset to zero, in that case.
if ((hours[0] == '-') ||
(hours[0] == '+'))
{
hoursOffset = System.Int32.Parse(hours);
minutesOffset = System.Int32.Parse(minutes);
}
else
{
hoursOffset = 0;
minutesOffset = 0;
}
// Compute the timezone's total offset in minutes
int offset = hoursOffset * 60;
if (hoursOffset < 0)
{
offset -= minutesOffset;
}
else
{
offset += minutesOffset;
}
// We now have a value which we can compare to the
// value that the user gave us.
if ((gmtOffset == offset) ||
(gmtOffset == ALL_TIMEZONES_LIST))
{
// Match. Add timezone to list. So far, we have
// the standard time name and the display name.
// We still need to get the DST name and the
// TIME_ZONE_INFORMATION.
string dstName;
dstName = tzKey.GetValue("Dlt").ToString();
// Read the time zone information from the
// registry. Unfortunately, this is something
// that only the Control Panel code actually
// knows about, so, if they change it, we break.
TZREG tzr = new TZREG();
int tzrSize = tzr.ToByteArray().Length;
TimeZoneInformation tzi = new TimeZoneInformation();
byte[] btzr;
btzr = (byte[])tzKey.GetValue("TZI");
tzr = new TZREG(btzr);
tzi.Bias = tzr.Bias;
tzi.StandardBias = tzr.StandardBias;
tzi.DaylightBias = tzr.DaylightBias;
tzi.StandardDate = tzr.StandardDate;
tzi.DaylightDate = tzr.DaylightDate;
// Don't forget to copy the standard name and
// daylight name to the structure.
tzi.DaylightName = dstName;
tzi.StandardName = thiskeyname;
// Copy the display name from the registry to
// the class.
tzi.DisplayName = dispName;
this.Add(tzi);
}
} //endif dispname null
// close the timezone key.
tzKey.Close();
} //endif tzkey null
} //end foreach subkeynames
// Close the key.
baseKey.Close();
}
}
else
{
//Pocket PC
InitCityDb();
ClockLoadAllTimeZoneData();
int nZones = ClockGetNumTimezones();
//tzData = new TZData[nZones];
for (int i = 0; i < nZones; i++)
{
IntPtr p = ClockGetTimeZoneDataByOffset(i);
TZData tmp = new TZData(p);
if ((gmtOffset == tmp.GMTOffset) ||
(gmtOffset == ALL_TIMEZONES_LIST))
{
TimeZoneInformation tzi = new TimeZoneInformation();
tzi.Bias = tmp.GMTOffset;
tzi.DaylightBias = tmp.DSTOffset;
// tzi.StandardDate = tzr.StandardDate;
// tzi.DaylightDate = tzr.DaylightDate;
// Don't forget to copy the standard name and
// daylight name to the structure.
tzi.DaylightName = tmp.DSTName;
tzi.StandardName = tmp.Name;
// Copy the display name from the registry to
// the class.
tzi.DisplayName = tmp.ShortName;
this.Add(tzi);
}
}
ClockFreeAllTimeZoneData();
UninitCityDb();
}
}
