Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Retrieving information about all users currently logged on to the workstation (WinNT only)
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Converting strings between ANSI and OEM
How to play a waveform sound (a WAV file in particular)
Retrieveing general information about the driver and data source associated with an ODBC connection
Retrieving the name of the network resource associated with a local device
StrDup returns a pointer to the duplicate of a source VFP string
Using the heap of the calling process to allocate memory blocks
Using Video Capture: enumerating installed capture drivers
Converting characters to upper or lower case
Drawing a rectangle using Windows regular edges and borders
GDI+: loading image file, drawing on it, saving the result to another file
Retrieving the names of all sections in an initialization file
Setting the volume label
Opening the Page Setup dialog box to specify the attributes of a printed page
Pocket PC: System Registry Viewer
Using FillMemory
Using named pipes for interprocess communication
Winsock: how to retrieve a service information corresponding to a service name
Basic Volume information
Extended OS Version info
GDI+: Using Scale and Shear transformations
Retrieving country-specific dialing information from the Windows Telephony list of countries
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: 39  
Listed functions:
GetTimeZoneInformation
SetTimeZoneInformation
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