SetTimeZoneInfo unable to read the timezone name for the next time

[Vignesh97]

Hi All

I have used SetTimeZoneInfo to change time zone of my system.

The date and time is changed according to the timezone i have chosen.

But , in the Timezone settings dialog box, it says "Your current time zone is not recognized. Please select a valid time zone."

Because of this , i'm not able to read the system time zone for the next time.

I tried changing in the registry too. even then i'm facing the same problem.

The registry path i used is : "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation"

and "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\TimeZoneInformation"*
*
My code is here*
@
QString RegKey = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones";
QSettings settings(RegKey, QSettings::NativeFormat);
QStringList childKeys = settings.childGroups();
int i = 0;
QString strStdName;
for (QStringList::iterator it = childKeys.begin();it != childKeys.end(); ++it)
{
QString strtimeZone = RegKey + "\" + *it;
QSettings settings1(strtimeZone, QSettings::NativeFormat);
QString str = settings1.value("Display",0).toString();
strStdName = settings1.value("Std",0).toString();
if(str == strDisplayName)
{
QString RegKey1 = "SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones";
QString newRegKey = RegKey1 + "\" + strStdName;
LPCWSTR lpString = newRegKey.utf16();
if( RegOpenKey(HKEY_LOCAL_MACHINE,lpString,&hk) == ERROR_SUCCESS)
{
dwType = REG_SZ;

            if( RegQueryValueEx(hk,L"TZI",0, &dwType, (BYTE *) &binary_data, &size) == ERROR_SUCCESS)
            {
                tz.Bias = binary_data.Bias;
                tz.DaylightBias = binary_data.DaylightBias;
                tz.DaylightDate = binary_data.DaylightDate;
                tz.StandardBias = binary_data.StandardBias;
                tz.StandardDate = binary_data.StandardDate;
                QSettings settingsTimeZone(newRegKey, QSettings::NativeFormat);
                 muiStd = settingsTimeZone.value("MUI_Std").toString();
                 muiDlt= settingsTimeZone.value("MUI_Dlt",0).toString();
                 muiDisplay= settingsTimeZone.value("MUI_Display",0).toString();
            }
            break;
        }

     }
 }
RegCloseKey(hk);


bStatus =  SetTimeZoneInformation(&tz);
if( !SetTimeZoneInformation( &tz ) )
{
    qDebug("STZI failed (%s)\n", GetLastError());
    return 0;
}

QSettings settingsTimeZoneCurrent("HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation" , QSettings::NativeFormat);        
QSettings settingsTimeZoneCurrent001("HKEY_LOCAL_MACHINE\\SYSTEM\\ControlSet001\\Control\\TimeZoneInformation" , QSettings::NativeFormat);        

settingsTimeZoneCurrent.setValue("TimeZoneKeyName",strStdName);
settingsTimeZoneCurrent.setValue("StandardName",muiStd);
settingsTimeZoneCurrent.setValue("DaylightName",muiDlt);
settingsTimeZoneCurrent001.setValue("TimeZoneKeyName",strStdName);
settingsTimeZoneCurrent001.setValue("StandardName",muiStd);
settingsTimeZoneCurrent001.setValue("DaylightName",muiDlt);

if(bStatus == false)
{
    DWORD dwErrorCode = GetLastError();
    return false;
}

// Disable the privilege

tkp.Privileges[0].Attributes = 0;
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, (PTOKEN_PRIVILEGES) NULL, 0);

@
strDisplayName is the name of the TimeZone which will come from UI.

Can anyone help me in this regard please.

Thanks in advance.

[Please wrap code in @ tags; mlong]

[yaseminyilmaz]

Hi Vignesh97 and all,

I'm sorry it is a not a answer. I have to implement same thing as you done. Could you please say how I can use SetTimeZoneInformation within a Qt application (created by Qt Creator)? Which lib files should it be included to .Qt's pro file?

[Vignesh97]

Use

#include <windows.h>

Hope it will help u.

[yaseminyilmaz]

It is required to add Advapi32.lib library to .pro file so that the registry functions of Win32 API can be recognised by Qt.

[raidsan]

It seem that you miss two field data of "tz":
@WCHAR StandardName[32];
WCHAR DaylightName[32]; @

@ bStatus = SetTimeZoneInformation(&tz);
if( !SetTimeZoneInformation( &tz ) )
{
qDebug("STZI failed (%s)\n", GetLastError());
return 0;
}

typedef struct _TIME_ZONE_INFORMATION {
LONG Bias;
WCHAR StandardName[32];
SYSTEMTIME StandardDate;
LONG StandardBias;
WCHAR DaylightName[32];
SYSTEMTIME DaylightDate;
LONG DaylightBias;
} TIME_ZONE_INFORMATION
@