Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom HttpRequest class (WinINet)
Displaying icons in the system tray (VFP9)
How to create non-blocking Winsock server
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
How to copy the image of a form to the Clipboard using Bitmap API functions
How to print a bitmap file
Placing On-screen Alert on top of all windows
Adding an ODBC data source with the SQLConfigDataSource; use automatic or interactive mode
How to prevent users from accessing the Windows Desktop and from switching to other applications
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Accessing Windows Control Panel from VFP Application
How to draw custom Window Caption on FoxPro form
Adding user-defined items to the Control Menu of VFP form (requires VFP9)
How to put a horizontal text scrolling on the form (a news line, marquee)
Reading list of folders and files on FTP server
Accessing LSA Policy object (Local Security Authority)
Running MSDOS Shell as a child process with redirected input and output (smarter RUN command)
Semi-transparent Form
Compressing and decompressing files with Windows API Runtime Library routines
How to download a file from the FTP server using FtpGetFile
How to enable the SE_SHUTDOWN_NAME privilege for the application
Playing WAV sounds simultaneously
Accessing Adobe Reader 7.0 main menu from VFP application
Disconnecting USB Mass Storage Device programmatically
HOWTO: Use the Win32 API to Access File Dates and Times

User rating: 10/10 (1 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Versions:
click to open
Before you begin:
This sample code originates from HOWTO: Use the Win32 API to Access File Dates and Times

Unfortunately two regrettable errors make the original code unusable: missing @ character in GetFileTime call, and hex2dec function, never being tested I guess. So I was bold enough to make some fixes to it:
*********************************************************
* Function getftime
* Return the create date and time, last access date and time,
* last write date and time from a passed filename.
* 
* Passed:
* lcFileName (by value): fully-qualified filename
* 
* Returns:
* Logical .t. if completed successfully, .f. if not.
* 
* Return variables:
* ldCreateDate (date, by reference): Creation date
* lcCreateTime (character, by reference): Creation time (HH:MM:SS.mm)
* ldAccessDate (date, by reference): Last access date
* lcAccessTime (character, by reference): Last access time (HH:MM:SS.mm)
* lcLastWriteDate (date, by reference): Last write date
* lcLastWriteTime (character, by reference): Last write time (HH:MM:SS.mm)

STORE {} TO m.createdate, m.accessdate, m.lastwritedate
STORE "" TO m.createtime, m.accesstime, m.lastwritetime

m.OK = getftime("C:\Test.txt", @m.createdate, @m.createtime, ;
    @m.accessdate, @m.accesstime, @m.lastwritedate, @m.lastwritetime)

IF m.OK
    ? "Create date:      ", m.createdate
    ? "Create time:      " , m.createtime
    ? "Last access date: ", m.accessdate
    ? "Last access time: ", m.accesstime
    ? "Last write date:  ", m.lastwritedate
    ? "Last write time:  ", m.lastwritetime
ELSE
    ? "Error getting file times"
ENDIF
* End of usage example.

FUNCTION getftime
PARAMETERS lcFileName, ldCreateDate, lcCreateTime, ldAccessDate,;
    lcAccessTime, ldLastWriteDate, lcLastWriteTime

* DEFINEs for file share mode.
#DEFINE FILE_SHARE_READ  1
#DEFINE FILE_SHARE_WRITE 2

* DEFINEs for access right
 #DEFINE GENERIC_READ  hex2dec("80000000")
 #DEFINE GENERIC_WRITE hex2dec("40000000")

* DEFINES for Create Mode.
#DEFINE CREATE_NEW  1
#DEFINE CREATE_ALWAYS 2
#DEFINE OPEN_EXISTING 3
#DEFINE OPEN_ALWAYS 4
#DEFINE TRUNCATE_EXISTING 5

* File flag.
#DEFINE FILE_ATTRIBUTE_NORMAL hex2dec("80")

    * Blank filename or nonexistent file, no need to continue.
    IF EMPTY(lcFileName) OR NOT FILE(lcFileName)
        RETURN .F.
    ENDIF

    DECLARE INTEGER CreateFile IN kernel32;
        STRING lpFileName, INTEGER dwDesiredAccess,;
        INTEGER dwShareMode, INTEGER lpSecurityAttributes,;
        INTEGER dwCreationDisposition,;
        INTEGER dwFlagsAndAttributes, INTEGER hTemplateFile

    DECLARE INTEGER GetFileTime IN kernel32;
        INTEGER hFile, STRING @lpCreationTime,;
        STRING @lpLastAccessTime, STRING @lpLastWriteTime

    DECLARE INTEGER FileTimeToLocalFileTime IN kernel32;
        STRING @lpFileTime, STRING @lpLocalFileTime

    DECLARE INTEGER FileTimeToSystemTime IN kernel32;
        STRING @lpFileTime, STRING @lpSystemTime

    DECLARE INTEGER GetLastError IN kernel32
    DECLARE INTEGER CloseHandle IN kernel32 INTEGER hObject

    * 2 DWORDs * 4 bytes each = an 8-byte buffer.
    STORE SPACE(8) TO CreationTime, LastAccessTime, lastwritetime

    * Same buffers for local time.
    STORE SPACE(8) TO LocalCreationTime,;
        LocalLastAccessTime, LocalLastWriteTime

    * 16-byte buffers for when we convert from the FILETIME
    * structs to the more human-readable SYSTEMTIME structures.
    STORE SPACE(16) TO ctSystemTime, laSystemTime, lwSystemTime

    * Open an existing file.
    lhFileHandle = CreateFile(lcFileName, GENERIC_READ,;
        FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)

    IF lhFileHandle <= 0
        =MESSAGEB ("Error in CreateFile - " + lcFileName + ": Error code - " + ;
            LTRIM(STR(GetLastError())))
        RETURN .F.
    ENDIF

    * Make the GetFileTime call, to get Create, Access and Update times.
    m.retval = GetFileTime (lhFileHandle,;
        @CreationTime, @LastAccessTime, @lastwritetime)

    IF m.retval = 0
    * 32 = Sharing violation
    * 87 = Invalid parameter
        =MESSAGEB("Error calling GetFileTime. Error code: " + ;
            LTRIM(STR(GetLastError())))
        RETURN .F.
    ENDIF

* Successfully performed the GetFileTime call -
* now convert each of the three times to local time.
* If any of them fail, then exit.
    IF     FileTimeToLocalFileTime (@CreationTime, @LocalCreationTime) = 0;
        OR FileTimeToLocalFileTime (@LastAccessTime,@LocalLastAccessTime) = 0;
        OR FileTimeToLocalFileTime (@lastwritetime, @LocalLastWriteTime) = 0 

        = MESSAGEB("FileTimeToLocalFileTime Failed. Error code: " + ;
            LTRIM(STR(GetLastError())))
        RETURN .F.
    ENDIF

* Now you have a local filetime, convert each to a systemtime that
* you can work with.
* If any of the calls fail, then exit.
    IF     FileTimeToSystemTime (@LocalCreationTime, @ctSystemTime) = 0;
        OR FileTimeToSystemTime (@LocalLastAccessTime, @laSystemTime) = 0;
        OR FileTimeToSystemTime (@LocalLastWriteTime, @lwSystemTime) = 0

        = MESSAGEB("FileTimeToSystemTime call failed. Error code: " ;
            + LTRIM(STR(GetLastError())))
        RETURN .F.
    ENDIF

    ctstYear = Str2Word(LEFT(ctSystemTime, 2))
    ctstMonth = Str2Word(SUBSTR(ctSystemTime, 3, 2))
    ctstDayofWeek = Str2Word(SUBSTR(ctSystemTime, 5, 2))
    ctstDay = Str2Word(SUBSTR(ctSystemTime, 7, 2))
    ctstHour = Str2Word(SUBSTR(ctSystemTime, 9, 2))
    ctstMinute = Str2Word(SUBSTR(ctSystemTime, 11, 2))
    ctstSecond = Str2Word(SUBSTR(ctSystemTime, 13, 2))
    ctstMilliSecond = Str2Word(SUBSTR(ctSystemTime, 15, 2))

* Unpack the integers in last access time SystemTime structure.
    lastYear = Str2Word(LEFT(laSystemTime, 2))
    lastMonth = Str2Word(SUBSTR(laSystemTime, 3, 2))
    lastDayofWeek = Str2Word(SUBSTR(laSystemTime, 5, 2))
    lastDay = Str2Word(SUBSTR(laSystemTime, 7, 2))
    lastHour = Str2Word(SUBSTR(laSystemTime, 9, 2))
    lastMinute = Str2Word(SUBSTR(laSystemTime, 11, 2))
    lastSecond = Str2Word(SUBSTR(laSystemTime, 13, 2))
    lastMilliSecond = Str2Word(SUBSTR(laSystemTime, 15, 2))

* Unpack the integers in last write time SystemTime structure.
    lwstYear = Str2Word(LEFT(lwSystemTime, 2))
    lwstMonth = Str2Word(SUBSTR(lwSystemTime, 3, 2))
    lwstDayofWeek = Str2Word(SUBSTR(lwSystemTime, 5, 2))
    lwstDay = Str2Word(SUBSTR(lwSystemTime, 7, 2))
    lwstHour = Str2Word(SUBSTR(lwSystemTime, 9, 2))
    lwstMinute = Str2Word(SUBSTR(lwSystemTime, 11, 2))
    lwstSecond = Str2Word(SUBSTR(lwSystemTime, 13, 2))
    lwstMilliSecond = Str2Word(SUBSTR(lwSystemTime, 15, 2))

* Close the file handle.
    llRetCode = CloseHandle(lhFileHandle)

* Format the return variables.
    ldCreateDate = CTOD(LTRIM(STR(ctstMonth)) + "/" + ;
        LTRIM(STR(ctstDay)) + "/" + LTRIM(STR(ctstYear)))

    lcCreateTime = PADL(LTRIM(STR(ctstHour)), 2, "0") + ":" + ;
        PADL(LTRIM(STR(ctstMinute)), 2, "0") + ":" + ;
        PADL(LTRIM(STR(ctstSecond)), 2, "0") + "." + ;
        PADL(LTRIM(STR(ctstMilliSecond)), 3, "0")

    ldAccessDate = CTOD(LTRIM(STR(lastMonth)) + "/" + ;
        LTRIM(STR(lastDay)) + "/" + LTRIM(STR(lastYear)))

    lcAccessTime = PADL(LTRIM(STR(lastHour)), 2, "0") + ":" + ;
        PADL(LTRIM(STR(lastMinute)), 2, "0") + ":" + ;
        PADL(LTRIM(STR(lastSecond)), 2, "0") + "." + ;
        PADL(LTRIM(STR(lastMilliSecond)), 3, "0")

    ldLastWriteDate = CTOD(LTRIM(STR(lwstMonth))+ ;
        "/"+LTRIM(STR(lwstDay)) + "/" + LTRIM(STR(lwstYear)))

    lcLastWriteTime = PADL(LTRIM(STR(lwstHour)), 2, "0") + ":" + ;
        PADL(LTRIM(STR(lwstMinute)), 2, "0") + ":" + ;
        PADL(LTRIM(STR(lwstSecond)), 2, "0") + "." + ;
        PADL(LTRIM(STR(lwstMilliSecond)), 3, "0")

* Function hex2dec - Convert a character hex value into decimal.
* Handy for dealing with Hex declarations in API calls.
* Passed: m.hex (character hex value)
* Returns: Decimal value
FUNCTION hex2dec
PARAMETER m.hex
    m.decimal = 0
    FOR i = LEN(m.hex) TO 1 STEP -1
        m.decimal = m.decimal + (AT(SUBSTR(m.hex, i, 1), ;
            "0123456789ABCDEF") - 1) * 16 ^ (LEN(m.hex) - i)
    NEXT
RETURN m.decimal

* Function str2word - Converts low-high format string representation
* to a 16-bit integer (word) value. Useful for unrolling structure
* members containg WORD types.
* 
* Passed: Low-high string representation of 16-bit integer
* Returns: numeric value
FUNCTION Str2Word
PARAMETERS m.wordstr
    PRIVATE i, m.retval

    m.retval = 0
    FOR i = 0 TO 8 STEP 8
        m.retval = m.retval + (ASC(m.wordstr) * (2^i))
        m.wordstr = RIGHT(m.wordstr, LEN(m.wordstr) - 1)
    NEXT
RETURN m.retval


User rating: 10/10 (1 votes)
Rate this code sample:
  • ~
8038 bytes  
Created: 2001-10-28 10:13:20  
Modified: 2007-05-04 08:01:54  
Visits in 7 days: 170  
Listed functions:
CloseHandle
CreateFile
FileTimeToLocalFileTime
FileTimeToSystemTime
GetFileTime
GetLastError
Printer friendly API declarations
My comment:
It seems that calling MODIFY FILE in VFP6 completely removes the previous file state, because the file creation time changes to become equivalent to the last write time. This is in contrast to the Notepad editing, which preserves the original creation datetime value.

FoxPro ADIR() function places information about files into an array and then returns the number of files. It returns only date and time the file was last modified.

In C# version, I use managed FileInfo object instead of accessing file times through the System.Runtime.InteropServices namespace.
Word Index links for this example:
Translate this page:
  Spanish    Portuguese    German    French    Italian  
FreeTranslation.com offers instant, free translations of text or web pages.
User Contributed Notes:
There are no notes on this subject.


Copyright 2001-2014 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. 

Privacy policy
Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.1.68), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (54.234.2.94)
10 sec.Function: 'GetDefaultPrinter'
Function group: 'Printing and Print Spooler'
Google
Advertise here!