OpenEuphoria

2. Re: file properties with DIR function : Bug ?

• Posted by Robert Craig <rds at RapidEuphoria.com> Aug 14, 2006
• 738 views
• Last edited Aug 15, 2006

chadal wrote:
> I'm trying the DIR function to use the date time modified value of each file.
> 
> I've found difference between two results :
> 
> with the MS explorer.
> with the standard DIR function of Euphoria language.
> 
> the value of the second in the time property of the file is not the same  
> 
> here, my code :
> 
> }}}
<eucode>
> include file.e
> sequence d
> d = dir(current_dir())
> pretty_print(1,d,{})
> if getc(0) then
> end if
> </eucode>
{{{

> 
> here, the result for the last file :
> {
> {116't',101'e',115's',116't',95'_',100'd',105'i',114'r',46'.',101'e',
> 120'x',119'w'},
> {97'a'},
> 99'c',
> 2006,
> 8,
> 14,
> 15,
> 43'+',
> 26
> }
> 
> And the value of the modified date time property for the "test_dir.exw" file,
> 
> displaying by MS explorer on Window XP is : lundi 14 août 2006, 15 :43 : 24
> 
> the differenc is 2 seconds !
> 
> Anyone have an idea ? am I tired ? is it a bug ?

I checked a few files on my machine, and it looks ok. No difference.

The date stored on disk is only supposed to be accurate 
to 2 seconds, so it's really an off-by-one error, 
but I have no idea why you are seeing that. 

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com

4. Re: file properties with DIR function : Bug ?

• Posted by Robert Craig <rds at RapidEuphoria.com> Aug 21, 2006
• 733 views

chadal wrote:
> To be sure about my problem, i've wrote a small euphoria program using the
> dir32 library from archives. I've used FileTimeToLocalFileTime and
> FileTimeToSystemTime
> functions from kernel32.dll. the result confirms the différenc between the
> euphoria
> DIR function and windows functions.
>  Is it an installation trouble ?
>  To understand what's happened, what kind of checks can i do ?

I'm not sure what you mean by the "dir32" library, unless it's
Overman's dir232.zip (which I haven't looked at). 
I support the standard dir() in Euphoria. I don't know why the 
time stamp on a file could differ by 2 seconds in some cases. 
I haven't noticed it on my machine using dir(). 
I simply retrieve a C structure, and have to multiply the "seconds" 
field by 2, since for some reason Microsoft doesn't store the "seconds" 
but rather the "seconds divided by two". Maybe it's a Y2K bug   
Maybe in Europe Windows adjusted the clock at the turn 
of the millennium? Maybe it depends on the version of Microsoft's
file system that you are using. I have no idea.

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com

6. Re: file properties with DIR function : Bug ?

• Posted by Juergen Luethje <j.lue at gmx.de> Aug 21, 2006
• 746 views

Pete Lomax wrote:

> On Mon, 21 Aug 2006 06:44:07 -0700, Robert Craig
> <guest at RapidEuphoria.com> wrote:
> 
>> I simply retrieve a C structure, and have to multiply the "seconds"
>> field by 2, since for some reason Microsoft doesn't store the "seconds"
>> but rather the "seconds divided by two". Maybe it's a Y2K bug  
> 
> That's odd. On my win98 box here, using kernel32 api, I just peek2u
> the seconds and it is spot on. Try this:
> }}}
<eucode>
> -- dir() clone using windows api:
> include dll.e
> include machine.e
> 
> if platform()!=2 then ?9/0 end if   --Win32 rqd (for kernel32!)
> 
> constant
>     -- FILETIME structure:
> --  FTdwLowDateTime     = 0,    --  DWORD dwLowDateTime
> --  FTdwHighDateTime    = 4,    --  DWORD dwHighDateTime
>     FTsize              = 8,
>     -- WIN32_FIND_DATA structure:
>     FDwFileAttributes   = 0,    --  DWORD dwFileAttributes
> --  FDtCreationTime     = 4,    --  FILETIME ftCreationTime
> --  FDtLastAccessTime   = 12,   --  FILETIME ftLastAccessTime
>     FDtLastWriteTime    = 20,   --  FILETIME ftLastWriteTime
>     FDnFileSizeHigh     = 28,   --  DWORD    nFileSizeHigh
>     FDnFileSizeLow      = 32,   --  DWORD    nFileSizeLow
> --  FDwReserved0        = 36,   --  DWORD    dwReserved0
> --  FDwReserved1        = 40,   --  DWORD    dwReserved1
>     FDcFileName         = 44,   --  TCHAR    cFileName[ MAX_PATH(=260)
> ]
> --  FDcAltFileName      = 304,  --  TCHAR    cAlternateFileName[ 14 ]
>     FDsize              = 318,
>     -- SYSTEMTIME structure:
>     STwYear             = 0,    --  WORD wYear
>     STwMonth            = 2,    --  WORD wMonth
> --  STwDayOfWeek        = 4,    --  WORD wDayOfWeek
>     STwDay              = 6,    --  WORD wDay
>     STwHour             = 8,    --  WORD wHour
>     STwMinute           = 10,   --  WORD wMinute
>     STwSecond           = 12,   --  WORD wSecond
> --  STwMillisecs        = 14,   --  WORD wMilliseconds
>     STsize = 16,
> 
>     INVALID_HANDLE_VALUE = -1,
> 
>     kernel32 = open_dll("kernel32.dll"),
>     C_PTR = C_POINTER,
>     xFindFirstFile =
> define_c_func(kernel32,"FindFirstFileA",{C_PTR,C_PTR},C_PTR),
>     xFindNextFile =
> define_c_func(kernel32,"FindNextFileA",{C_PTR,C_PTR},C_INT),
>     xFindClose = define_c_proc(kernel32,"FindClose",{C_PTR}),
>     xFileTimeToLocalFileTime =
> define_c_func(kernel32,"FileTimeToLocalFileTime",{C_PTR,C_PTR},C_INT),
>     xFileTimeToSystemTime =
> define_c_func(kernel32,"FileTimeToSystemTime",{C_PTR,C_PTR},C_INT),
> 
>     xFindData = allocate(FDsize),
>     xLocalFileTime = allocate(FTsize),
>     xSystemTime = allocate(STsize),
> 
>     attrbits={#01,#02,#04,#00,#10,#20}, -- no volume_id
>     attrchar={'r','h','s','v','d','a'}
> 
> function peek_string(atom addr)
> atom last
>     last = addr
>     while peek(last) do
>         last += 1
>     end while
>     if addr != last then
>         return peek( {addr, last - addr} )
>     else
>         return ""
>     end if
> end function
> 
> function peek2u(atom addr)
>     return peek(addr) + peek(addr+1)*256
> end function
> 
> function ConvertAttributes(integer c)
> --
> -- Convert the bitmap of file attributes into a text string
> --
> sequence res
>     res=""
>     for i=1 to length(attrbits) do
>         if and_bits(c,attrbits[i]) then
>             res&=attrchar[i]
>         end if
>     end for
>     return res
> end function
> 
> global function apidir(sequence path)
> integer d
> atom lpPath, h
> sequence res
>     while 1 do
>         --
>         -- Force consistent use of '\\' vs '/'.
>         --
>         d=find('/',path)
>         if d=0 then exit end if
>         path[d]='\\'
>     end while
>     if length(path) and path[length(path)]='\\' then
>         path&="*.*"
>     elsif not find('*',path) and not find('?',path) then
>         --
>         -- Check if the passed path is a directory
>         --
>         lpPath = allocate_string(path)
>         h = c_func(xFindFirstFile,{lpPath,xFindData})
>         if h != INVALID_HANDLE_VALUE then
>             if and_bits(peek(xFindData+FDwFileAttributes),#10) then
>                 path &= "\\*.*"
>             end if
>             c_proc(xFindClose,{h})
>         end if
>         free(lpPath)
>     end if
>     lpPath = allocate_string(path)
>     h = c_func(xFindFirstFile,{lpPath,xFindData})
>     free(lpPath)
>     if h = INVALID_HANDLE_VALUE then return -1 end if
>     res={}
>     while 1 do
>         if
> c_func(xFileTimeToLocalFileTime,{xFindData+FDtLastWriteTime,xLocalFileTime})
> then end if
>         if c_func(xFileTimeToSystemTime,{xLocalFileTime,xSystemTime})
> then end if
>         res=append(res,{peek_string(xFindData+FDcFileName),
> 
> ConvertAttributes(peek4u(xFindData+FDwFileAttributes)),
> 
> peek4s(xFindData+FDnFileSizeHigh)*#100000000+peek4u(xFindData+FDnFileSizeLow),
>                         peek2u(xSystemTime+STwYear),
>                         peek2u(xSystemTime+STwMonth),
>                         peek2u(xSystemTime+STwDay),
>                         peek2u(xSystemTime+STwHour),
>                         peek2u(xSystemTime+STwMinute),
>                         peek2u(xSystemTime+STwSecond)})
>         if not c_func(xFindNextFile,{h,xFindData}) then exit end if
>     end while
>     c_proc(xFindClose,{h})
>     return res
> end function
> 
> include ppp.e        -- or use pretty_print().
> include file.e
> pp(dir("C:\\*.bak"))
> pp(apidir("C:\\*.bak"))
> if getc(0) then end if
> </eucode>
{{{



The old DOS time format uses "seconds divided by two"
(I belive the purpose was to save storage space).

-- The following constants can also be used to refer
-- to elements of EUPHORIA's date() function:
constant
E_YEAR = 1, E_MONTH = 2, E_DAY = 3,
E_HOUR = 4, E_MINUTE = 5, E_SECOND = 6

global function dos_time (sequence t)
   -- in : {year,month,day,hour,minute,second}
   -- out: 32-bit integer in DOS time format
   integer hiWord, loWord

   hiWord = (t[E_YEAR]-1980)*#200 + t[E_MONTH]*#20 + t[E_DAY]        -- date
   loWord = t[E_HOUR]*#800 + t[E_MINUTE]*#20 + floor(t[E_SECOND]/2)  -- time

   return hiWord*#10000 + loWord
end function

Regards,
   Juergen

-- 
Please excuse my flawed English. My native language is Euphoria.

8. Re: file properties with DIR function : Bug ?

• Posted by chadal <francois.chadal at girce.caisse-epargne.fr> Aug 22, 2006
• 720 views

Hello Pete,

thank for your answer. I've used your code and the two results show différent
 values of the second property for a file.
Have you the same ? is it a "normal" différence between DOS ans windows XP ?

Cordialement,
François.

10. Re: file properties with DIR function : Bug ?

• Posted by Pete Lomax <petelomax at blueyonder.co.uk> Aug 22, 2006
• 716 views

On Tue, 22 Aug 2006 08:20:21 -0700, chadal <guest at RapidEuphoria.com>
wrote:

>Hello Pete,
>
> thank for your answer. I've used your code and the two results show diff=
=E9rent values of the second property for a file.
>Have you the same ?
On win98, I get exactly the same values for the seconds from both
dir() and apidir(), every time. I don't have XP to test it on.

Regards,
Pete

12. Re: file properties with DIR function : Bug ?

• Posted by chadal <francois.chadal at girce.caisse-epargne.fr> Aug 23, 2006
• 760 views

Hello Rob,

  Thank you to have made the tests. I am reassured. I prefer that. 
That confirms a concern with Windows and not a problem of defective installation
on my machine.

Cordialement,
FC

PostScriptum: All the discs of my machine are assembled NTFS