Using Win32 functions in Visual FoxPro Image Gallery
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Retrieving information specific to the current Time Zone

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*| typedef struct _TIME_ZONE_INFORMATION { 
*|     LONG       Bias;                  0        4
*|     WCHAR      StandardName[ 32 ];    4       64
*|     SYSTEMTIME StandardDate;         68       16
*|     LONG       StandardBias;         84        4
*|     WCHAR      DaylightName[ 32 ];   88       64
*|     SYSTEMTIME DaylightDate;        152       16
*|     LONG       DaylightBias;        168        4
*| } TIME_ZONE_INFORMATION, *PTIME_ZONE_INFORMATION; total 172 bytes
#DEFINE TIME_ZONE_SIZE  172
DO decl

LOCAL cTimeZone, cTimeZone_, nId
cTimeZone = Repli(Chr(0), TIME_ZONE_SIZE)

? "*** Retrieving current TimeZone info..."
nId = GetTimeZoneInformation(@cTimeZone)
= ShowTimeZoneInfo(cTimeZone)

?
? "*** Changing bias and standard name parameters..."
LOCAL nNewBias, cStandardName, cDaylightName
nNewBias = 301
*cStandardName = PADR(StrConv("Scarborough Standard",5),64,Chr(0))
cStandardName = PADR("My City Standard", 64, Chr(0))
cDaylightName = PADR("My City Daylight", 64, Chr(0))
cTimeZone_ = num2dword(nNewBias) + cStandardName +;
    SUBSTR(cTimeZone, 69, 20) +;
    cDaylightName +;
    SUBSTR(cTimeZone, 153)

= SetTimeZoneInformation(cTimeZone_) && setting
cTimeZone_ = Repli(Chr(0), TIME_ZONE_SIZE)  && clearing buffer
= GetTimeZoneInformation(@cTimeZone_) && re-populating buffer
= ShowTimeZoneInfo(cTimeZone_)

?
? "*** Back to old settings..."
= SetTimeZoneInformation(cTimeZone)
cTimeZone = Repli(Chr(0), TIME_ZONE_SIZE)
= GetTimeZoneInformation(@cTimeZone)
= ShowTimeZoneInfo(cTimeZone)
* end of main

FUNCTION GetTimeZoneType(nId)
#DEFINE TIME_ZONE_ID_UNKNOWN     0
#DEFINE TIME_ZONE_ID_STANDARD    1
#DEFINE TIME_ZONE_ID_DAYLIGHT    2
    DO CASE
    CASE nId = TIME_ZONE_ID_STANDARD
        RETURN "StandardDate member"
    CASE nId = TIME_ZONE_ID_DAYLIGHT
        RETURN "DaylightDate member"
    CASE nId = TIME_ZONE_ID_UNKNOWN
        RETURN "The system cannot determine the current time zone"
    OTHER
        RETURN "The Time Zone ID is invalid"
    ENDCASE

PROCEDURE ShowTimeZoneInfo(cTimeZone)
    ? "Bias (minutes between UTC and local):", buf2dword(SUBSTR(cTimeZone, 1,4))
    ? "Standard Bias:", buf2dword(SUBSTR(cTimeZone, 85,4))
    ? "Daylight Bias:", buf2dword(SUBSTR(cTimeZone, 169,4))
    ? "Standard name:", STRTRAN(SUBSTR(cTimeZone, 5,32), Chr(0),"")
    ? "Daylight name:", STRTRAN(SUBSTR(cTimeZone, 89,32), Chr(0),"")
    ? "Standard Date:",;
        buf2word(SUBSTR(cTimeZone,69,2)),;
        buf2word(SUBSTR(cTimeZone,71,2)),;
        buf2word(SUBSTR(cTimeZone,73,2)),;
        buf2word(SUBSTR(cTimeZone,75,2)),;
        buf2word(SUBSTR(cTimeZone,77,2)),;
        buf2word(SUBSTR(cTimeZone,79,2))
    ? "Daylight Date:",;
        buf2word(SUBSTR(cTimeZone,153,2)),;
        buf2word(SUBSTR(cTimeZone,155,2)),;
        buf2word(SUBSTR(cTimeZone,157,2)),;
        buf2word(SUBSTR(cTimeZone,159,2)),;
        buf2word(SUBSTR(cTimeZone,161,2)),;
        buf2word(SUBSTR(cTimeZone,163,2))

FUNCTION buf2dword(lcBuffer)
RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
    BitLShift(Asc(SUBSTR(lcBuffer, 2,1)),  8) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 3,1)), 16) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 4,1)), 24)

FUNCTION buf2word(lcBuffer)
RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
       Asc(SUBSTR(lcBuffer, 2,1)) * 256

FUNCTION num2dword(lnValue)
#DEFINE m0  256
#DEFINE m1  65536
#DEFINE m2  16777216
    IF lnValue < 0
        lnValue = 0x100000000 + lnValue
    ENDIF
    LOCAL b0, b1, b2, b3
    b3 = Int(lnValue/m2)
    b2 = Int((lnValue - b3*m2)/m1)
    b1 = Int((lnValue - b3*m2 - b2*m1)/m0)
    b0 = Mod(lnValue, m0)
RETURN Chr(b0)+Chr(b1)+Chr(b2)+Chr(b3)

FUNCTION num2word(lnValue)
RETURN Chr(MOD(m.lnValue,256)) + CHR(INT(m.lnValue/256))

PROCEDURE decl
    DECLARE INTEGER GetTimeZoneInformation IN kernel32;
        STRING @lpTimeZoneInformation

    DECLARE INTEGER SetTimeZoneInformation IN kernel32;
        STRING lpTimeZoneInformation



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3808 bytes  
Created: 2001-07-25 12:00:00  
Modified: 2004-06-18 16:07:56  
Visits in 7 days: 77  
Listed functions:
GetTimeZoneInformation
SetTimeZoneInformation
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