C＃WIndows CE Compact Framework 2.0設置系統時區

Question

我想在我的Windows CE Mobile中以編程方式更改系統時區？我該怎麼做 ？？

我閱讀了一些帖子，但我無法做到這一點？

有人可以給一個示例代碼來實現它嗎？

Answer 1

，如果你越過DST這是容易的，但棘手：http://www.hjgode.de/wp/2010/10/08/windows-mobile-setsystemtime-and-dst-einsteins-relativity-theory/

 private DateTime startDateTime = DateTime.Parse("2010/9/24 11:42:00"); 

    [DllImport("coredll.dll", SetLastError = true)] 
    static extern Int32 GetLastError(); 

    [DllImport("coredll.dll", SetLastError = true)] 
    static extern bool SetSystemTime(ref SYSTEMTIME time); 
    [DllImport("coredll.dll", SetLastError = true)] 
    static extern void GetSystemTime(out SYSTEMTIME lpSystemTime); 

    [DllImport("coredll.dll")] 
    static extern bool SetTimeZoneInformation([In] ref TIME_ZONE_INFORMATION lpTimeZoneInformation); 
    [DllImport("coredll.dll", CharSet = CharSet.Auto)] 
    private static extern int GetTimeZoneInformation(out TIME_ZONE_INFORMATION lpTimeZoneInformation); 

    private const int TIME_ZONE_ID_UNKNOWN = 0; 
    private const int TIME_ZONE_ID_STANDARD = 1; 
    private const int TIME_ZONE_ID_DAYLIGHT = 2; 

    [StructLayoutAttribute(LayoutKind.Sequential)] 
    public struct SYSTEMTIME 
    { 
     public short wYear; 
     public short wMonth; 
     public short wDayOfWeek; 
     public short wDay; 
     public short wHour; 
     public short wMinute; 
     public short wSecond; 
     public short wMilliseconds; 
    } 
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] 
    public struct TIME_ZONE_INFORMATION 
    { 
     public int bias; 
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
     public string standardName; 
     public SYSTEMTIME standardDate; 
     public int standardBias; 
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
     public string daylightName; 
     public SYSTEMTIME daylightDate; 
     public int daylightBias; 
    } 
... 
    private bool disableDST(TIME_ZONE_INFORMATION tzi){ 
     //set wMonth in standardDate to zero 
     SYSTEMTIME stStd; 
     stStd=tzi.standardDate; 
     stStd.wMonth=0; 
     //set wMonth in daylightDate to zero 
     SYSTEMTIME stDST; 
     stDST=tzi.daylightDate; 
     stDST.wMonth=0; 

     tzi.daylightDate=stDST; 
     tzi.standardDate=stStd; 
     bool bRes = SetTimeZoneInformation(ref tzi); 
     if (bRes) 
      addText("*** Disabling DST OK***"); 
     else 
      addText("*** Disabling DST failed***"); 
     return bRes; 
    } 

這是否幫助？

編輯：添加TZ-信息數據庫信息： 見https://github.com/hjgode/win-mobile-code/tree/master/TimeZoneSet

要獲得TZ-信息我用下面的C/C++代碼：

... 
typedef void (*INITCITYDB)(void); 
typedef void (*UNINITCITYDB)(void); 
typedef void (*LOADTZDATA)(void); 
typedef void (*FREETZDATA)(void); 
typedef int (*GETNUMZONES)(void); 
typedef void * (*GETTZDATABYOFFSET)(int, int*); 
typedef void * (*GETTZDATA)(int); 
struct TZData 
{ 
    TCHAR *Name; 
    TCHAR *ShortName; 
    TCHAR *DSTName; 
    int GMTOffset; 
    int DSTOffset; 
}; 
... 

，然後該工具來獲取信息

... 
int getCityDB() 
{ 
TZData *pTZ = NULL; 
int index; 

// load the library 
HINSTANCE hLib = LoadLibrary(_T("CityDB.dll")); 
if (hLib==NULL) 
    return -1; 
// load the CityDB functions 
INITCITYDB InitCityDB = (INITCITYDB)GetProcAddress(
     hLib, _T("InitCityDb")); 
UNINITCITYDB UninitCityDB = (UNINITCITYDB)GetProcAddress(
     hLib, _T("UninitCityDb")); 
LOADTZDATA ClockLoadAllTimeZoneData = (LOADTZDATA)GetProcAddress(
     hLib, _T("ClockLoadAllTimeZoneData")); 
FREETZDATA ClockFreeAllTimeZoneData = (FREETZDATA)GetProcAddress(
     hLib, _T("ClockFreeAllTimeZoneData")); 
GETNUMZONES ClockGetNumTimezones = (GETNUMZONES)GetProcAddress(
     hLib, _T("ClockGetNumTimezones")); 
GETTZDATABYOFFSET ClockGetTimeZoneDataByOffset = 
     (GETTZDATABYOFFSET)GetProcAddress(hLib, _T("ClockGetTimeZoneDataByOffset")); 
GETTZDATA ClockGetTimeZoneData = (GETTZDATA)GetProcAddress(
     hLib, _T("ClockGetTimeZoneData")); 

// Init the library 
InitCityDB(); 

// load the TZ data 
ClockLoadAllTimeZoneData(); 

// find out how many zones are defined 
int zoneCount = ClockGetNumTimezones(); 
... 

現在你可以遍歷直通的所有數據，詳見GitHub的代碼：

... 
wsprintf(wBuff, L"=================CityDB====================\n"); 
wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 
// interate through them all 
for(int zone = 0 ; zone < zoneCount ; zone++) 
{ 
    // these are pointers to a timezone data struct 
    pTZ = (TZData*)ClockGetTimeZoneDataByOffset(zone, &index); 

    wsprintf(wBuff, L"index: %i\n", index); 
    wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
    WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 

    wsprintf(wBuff, L"\tshort name: %s\n", pTZ->ShortName ); 
    wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
    WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 

    wsprintf(wBuff, L"\tname: %s\n", pTZ->Name); 
    wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
    WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 

    wsprintf(wBuff, L"\tGMT offset: %i\n", pTZ->GMTOffset ); 
    wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
    WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 

    wsprintf(wBuff, L"\tdst name: %s\n", pTZ->DSTName ); 
    wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
    WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 

    wsprintf(wBuff, L"\tDST offset: %i\n", pTZ->DSTOffset); 
    wcstombs(buff, wBuff, sizeof(wBuff)*sizeof(TCHAR)); 
    WriteFile(hFile, buff, strlen(buff), &numWritten, NULL); 
} 
CloseHandle(hFile); 

// unload the TZ data 
ClockFreeAllTimeZoneData(); 

// uninit the library 
UninitCityDB(); 
... 

這裏是一個示例輸出：

index: 95 
short name: GMT+1 Prague,Budapest 
name: Central Europe Standard Time 
GMT offset: -60 
dst name: Central Europe Daylight Time 
DST offset: 0 
... 

index: 110 
short name: GMT+1 Berlin,Rome 
name: W. Europe Standard Time 
GMT offset: -60 
dst name: W. Europe Daylight Time 
DST offset: 0 

參見我的文章在http://community.intermec.com/t5/Device-Management/change-Time-Zone-with-xml/td-p/17007