Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Displaying icons in the system tray (VFP9)
Windows Shell Icons displayed and exported to ICO files (Vista)
Attaching menu to a top-level form
GDI+: reading and writing metadata in JPEG and TIFF files
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Creating the Open dialog box to specify the drive, directory, and name of a file to open
How to detect if additional monitor is connected and active
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Storing screen shot of a form to bitmap file
Creating irregularly shaped FoxPro form using transparency color key
Time in milliseconds represented as string (e.g. 1 hour 24 min 36 sec)
GDI+: Storing content of the Clipboard to a bitmap file
Winsock: retrieving Web pages using sockets (HTTP, port 80)
Custom FTP Class for Visual FoxPro application
Detecting changes in connections to removable drives (VFP9)
Extended MessageBox Class
Using Month Calendar Control (VFP9, Comctl32.dll)
Class library providing access to the System Registry
How to download a file from the FTP server using FtpGetFile
How to retrieve version information for the specified file
Reading list of folders and files on FTP server
Semi-transparent Form
Uploading local file to FTP server with FtpPutFile
Printing Image File, programmatically set print page orientation to landscape
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: 123  
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 (174.129.76.87)
52 sec.Example: 'Displaying system dialog that selects a folder'
1.97 min.Example: 'How to display Windows On-Screen Keyboard'
3.5 min.Solution: 'ContextMenu ActiveX Control'
7.23 min.Example: 'Reading and setting explicit Application User Model ID for the current process (Win7)'
Google
Advertise here!