OpenEuphoria

2. Re: Simple Program to Change a File's Date and Time

• Posted by don cole <doncole at pacbell.net> Nov 30, 2005
• 634 views

Dr Hank Heyman wrote:
> 
> Hello all,
> 
> If I wanted to write a simple program in Euphoria to run in DOS
> that allowed me to change a file's date and time, how would I
> do that?
> 
> A program that I've used a lot, XTree Gold 3.0, included
> such a feature.  I know there's a software interrupt
> that does this.  I also believe that Turbo Pascal has
> a function for it.
> 
> A use for this would be to edit a file and change
> the file date and time back to its original date
> and time to maintain the original chronological
> order of a series of files.
> 
> Plus it might help me get restarted in programming.
> 
> Any ideas?
> 
> BTW, I changed my email address a while ago and
> had stopped receiving my Euphoria messages.
> 
> Thanks in advance for any help or ideas.
> 
> Sincerely,
> 
> Dr. Heyman


See my program 'moredates.e' in the archives.

You might have to write a function find_date().

Don Cole
 A Bug is an un-documented feature.
A Feature is a documented Bug.

4. Re: Simple Program to Change a File's Date and Time

• Posted by Juergen Luethje <j.lue at gmx.de> Nov 30, 2005
• 638 views

I had sent the following message more than 4 hours ago by mail via
Topica. Since it did not come through until now, I post it again here
via web interface:

Dr Hank Heyman wrote:

> Hello all,
> 
> If I wanted to write a simple program in Euphoria to run in DOS
> that allowed me to change a file's date and time, how would I
> do that?
>
> A program that I've used a lot, XTree Gold 3.0, included
> such a feature.  I know there's a software interrupt
> that does this.  I also believe that Turbo Pascal has
> a function for it.
> 
> A use for this would be to edit a file and change
> the file date and time back to its original date
> and time to maintain the original chronological
> order of a series of files.

You'll find a program that does what you want at the end of this post.

> Plus it might help me get restarted in programming.

Many people consider this DOS interrupt stuff not so simple.
If you consider the program "simple", then getting restarted in
programming should be easy for you. 

Anyway, we'll help you here on this list whenever we can.

-------------------------------------------------------------------
-- DOS32 routines to get/set date and time of files;
-- by Juergen Luethje
-- (reference: "Ralf Brown's Interrupt List")
-- tested with Euphoria 2.5
-- in the DOS box of Windows 98, and on plain DOS

include machine.e

function allocate_low_string (sequence string)
   -- create a C-style null-terminated string in low memory
   -- (like Euphoria's allocate_string(), but for low memory)
   integer low_addr

   low_addr = allocate_low(length(string)+1)
   if low_addr then
      poke(low_addr, string)
      poke(low_addr+length(string), 0)
   end if
   return low_addr
end function

function open_file_DOS32 (sequence filename)
   -- open existing file for read/write
   -- out: file handle on success, or -1 on error
   sequence reg_list
   atom low_buff

   reg_list = repeat(0, REG_LIST_SIZE)
   low_buff = allocate_low_string(filename)
   reg_list[REG_AX] = #3D02                         -- method = read/write
   reg_list[REG_DS] = floor(low_buff / #10)
   reg_list[REG_DX] = remainder(low_buff, #10)
   reg_list[REG_FLAGS] = 1                          -- set carry flag
   reg_list = dos_interrupt(#21, reg_list)
   free_low(low_buff)

   if and_bits(reg_list[REG_FLAGS], 1) then
      return -1
   else
      return reg_list[REG_AX]
   end if
end function

procedure close_file_DOS32 (integer handle)
   sequence reg_list

   reg_list = repeat(0, REG_LIST_SIZE)
   reg_list[REG_AX] = #3E00
   reg_list[REG_BX] = handle
   reg_list = dos_interrupt(#21, reg_list)
end procedure

-------------------------------------------------------------------

global function get_filetime_DOS32 (sequence filename)
   -- in : filename: name of the target file
   -- out: date and time in DOS filetime format, or -1 on error
   sequence reg_list
   integer handle

   handle = open_file_DOS32(filename)
   if handle = -1 then
      return -1
   end if
   reg_list = repeat(0, REG_LIST_SIZE)
   reg_list[REG_AX] = #5700
   reg_list[REG_BX] = handle
   reg_list[REG_FLAGS] = 1                          -- set carry flag
   reg_list = dos_interrupt(#21, reg_list)
   close_file_DOS32(handle)

   if and_bits(reg_list[REG_FLAGS], 1) then
      return -1
   else
      return {reg_list[REG_DX],                     -- file's date
              reg_list[REG_CX]}                     -- file's time
   end if
end function

global function set_filetime_DOS32 (sequence filename, sequence filetime)
   -- in : filename: name of the target file
   --      filetime: sequence of the form {date,time} (DOS filetime format)
   -- out: 0 on success, or -1 on error
   sequence reg_list
   integer handle

   handle = open_file_DOS32(filename)
   if handle = -1 then
      return -1
   end if
   reg_list = repeat(0, REG_LIST_SIZE)
   reg_list[REG_AX] = #5701
   reg_list[REG_BX] = handle
   reg_list[REG_DX] = filetime[1]                   -- file's date
   reg_list[REG_CX] = filetime[2]                   -- file's time
   reg_list[REG_FLAGS] = 1                          -- set carry flag
   reg_list = dos_interrupt(#21, reg_list)
   close_file_DOS32(handle)

   if and_bits(reg_list[REG_FLAGS], 1) then
      return -1
   else
      return 0
   end if
end function


constant
   E_YEAR = 1, E_MONTH = 2, E_DAY = 3,
   E_HOUR = 4, E_MINUTE = 5, E_SECOND = 6

global function time_to_dos_time (sequence t)
   -- in : sequence of the form {year,month,day,hour,minute,second}
   -- out: date and time in DOS filetime format
   --      (positive 32-bit integer in the interval [#00210000, #F19FBF7E]),
   --      split in its high and low words
   integer hiword, loword

   hiword = ((t[E_YEAR]-1980)*#10 + t[E_MONTH])*#20 + t[E_DAY]        -- date
   loword = (t[E_HOUR]*#40 + t[E_MINUTE])*#20 + floor(t[E_SECOND]/2)  -- time
   return {hiword, loword}
end function

-------------------------------------------------------------------

-- * Demo * --
include get.e                   -- for wait_key()

procedure wait (sequence msg)
   object void
   puts(2, msg & "\n\nPress any key ...")
   void = wait_key()
end procedure


sequence filename, dos_time, eu_time
integer fn, error

-- Sample file name and time
filename = "test.txt"
eu_time = {2001,3,20,14,23,6}

-- Create a test file
fn = open(filename, "w")
if fn = -1 then
   wait(sprintf("Cant't create file '%s'.", {filename}))
   abort(1)
end if
puts(fn, "This is old text.\n")
close(fn)


-- Demo 1: "manually" set an old file time
dos_time = time_to_dos_time(eu_time)

error = set_filetime_DOS32(filename, dos_time)
if error then
   wait(sprintf("Cant't set time of file '%s'.", {filename}))
   abort(1)
end if
puts(1, "#1: success\n")


-- Demo 2: get the time of an arbitrary file,
--         change its contents and reset its time
dos_time = get_filetime_DOS32(filename)

fn = open(filename, "a")
if fn = -1 then
   wait(sprintf("Cant't open file '%s'.", {filename}))
   abort(1)
end if
puts(fn, "This is new text.\n")
close(fn)

error = set_filetime_DOS32(filename, dos_time)
if error then
   wait(sprintf("Cant't set time of file '%s'.", {filename}))
   abort(1)
end if
wait("#2: success\n")
-------------------------------------------------------------------

Regards,
   Juergen

-- 
Have you read a good program lately?

6. Re: Simple Program to Change a File's Date and Time

• Posted by "Juergen Luethje" <j.lue at gmx.de> Nov 30, 2005
• 612 views

Dr Hank Heyman wrote:

> Hello all,
>
> If I wanted to write a simple program in Euphoria to run in DOS
> that allowed me to change a file's date and time, how would I
> do that?
>
> A program that I've used a lot, XTree Gold 3.0, included
> such a feature.  I know there's a software interrupt
> that does this.  I also believe that Turbo Pascal has
> a function for it.
>
> A use for this would be to edit a file and change
> the file date and time back to its original date
> and time to maintain the original chronological
> order of a series of files.

You'll find a program that does what you want at the end of this post.

> Plus it might help me get restarted in programming.

Many people consider this DOS interrupt stuff not so simple.
If you consider the program "simple", then getting restarted in
programming should be easy for you. 

Anyway, we'll help you here on this list whenever we can.

-------------------------------------------------------------------
-- DOS32 routines to get/set date and time of files;
-- by Juergen Luethje
-- (reference: "Ralf Brown's Interrupt List")
-- tested with Euphoria 2.5
-- in the DOS box of Windows 98, and on plain DOS

include machine.e

function allocate_low_string (sequence string)
   -- create a C-style null-terminated string in low memory
   -- (like Euphoria's allocate_string(), but for low memory)
   integer low_addr

   low_addr = allocate_low(length(string)+1)
   if low_addr then
      poke(low_addr, string)
      poke(low_addr+length(string), 0)
   end if
   return low_addr
end function

function open_file_DOS32 (sequence filename)
   -- open existing file for read/write
   -- out: file handle on success, or -1 on error
   sequence reg_list
   atom low_buff

   reg_list = repeat(0, REG_LIST_SIZE)
   low_buff = allocate_low_string(filename)
   reg_list[REG_AX] = #3D02                         -- method = read/write
   reg_list[REG_DS] = floor(low_buff / #10)
   reg_list[REG_DX] = remainder(low_buff, #10)
   reg_list[REG_FLAGS] = 1                          -- set carry flag
   reg_list = dos_interrupt(#21, reg_list)
   free_low(low_buff)

   if and_bits(reg_list[REG_FLAGS], 1) then
      return -1
   else
      return reg_list[REG_AX]
   end if
end function

procedure close_file_DOS32 (integer handle)
   sequence reg_list

   reg_list = repeat(0, REG_LIST_SIZE)
   reg_list[REG_AX] = #3E00
   reg_list[REG_BX] = handle
   reg_list = dos_interrupt(#21, reg_list)
end procedure

-------------------------------------------------------------------

global function get_filetime_DOS32 (sequence filename)
   -- in : filename: name of the target file
   -- out: date and time in DOS filetime format, or -1 on error
   sequence reg_list
   integer handle

   handle = open_file_DOS32(filename)
   if handle = -1 then
      return -1
   end if
   reg_list = repeat(0, REG_LIST_SIZE)
   reg_list[REG_AX] = #5700
   reg_list[REG_BX] = handle
   reg_list[REG_FLAGS] = 1                          -- set carry flag
   reg_list = dos_interrupt(#21, reg_list)
   close_file_DOS32(handle)

   if and_bits(reg_list[REG_FLAGS], 1) then
      return -1
   else
      return {reg_list[REG_DX],                     -- file's date
              reg_list[REG_CX]}                     -- file's time
   end if
end function

global function set_filetime_DOS32 (sequence filename, sequence filetime)
   -- in : filename: name of the target file
   --      filetime: sequence of the form {date,time} (DOS filetime format)
   -- out: 0 on success, or -1 on error
   sequence reg_list
   integer handle

   handle = open_file_DOS32(filename)
   if handle = -1 then
      return -1
   end if
   reg_list = repeat(0, REG_LIST_SIZE)
   reg_list[REG_AX] = #5701
   reg_list[REG_BX] = handle
   reg_list[REG_DX] = filetime[1]                   -- file's date
   reg_list[REG_CX] = filetime[2]                   -- file's time
   reg_list[REG_FLAGS] = 1                          -- set carry flag
   reg_list = dos_interrupt(#21, reg_list)
   close_file_DOS32(handle)

   if and_bits(reg_list[REG_FLAGS], 1) then
      return -1
   else
      return 0
   end if
end function


constant
   E_YEAR = 1, E_MONTH = 2, E_DAY = 3,
   E_HOUR = 4, E_MINUTE = 5, E_SECOND = 6

global function time_to_dos_time (sequence t)
   -- in : sequence of the form {year,month,day,hour,minute,second}
   -- out: date and time in DOS filetime format
   --      (positive 32-bit integer in the interval [#00210000, #F19FBF7E]),
   --      split in its high and low words
   integer hiword, loword

   hiword = ((t[E_YEAR]-1980)*#10 + t[E_MONTH])*#20 + t[E_DAY]        -- date
   loword = (t[E_HOUR]*#40 + t[E_MINUTE])*#20 + floor(t[E_SECOND]/2)  -- time
   return {hiword, loword}
end function

-------------------------------------------------------------------

-- * Demo * --
include get.e                   -- for wait_key()

procedure wait (sequence msg)
   object void
   puts(2, msg & "\n\nPress any key ...")
   void = wait_key()
end procedure


sequence filename, dos_time, eu_time
integer fn, error

-- Sample file name and time
filename = "test.txt"
eu_time = {2001,3,20,14,23,6}

-- Create a test file
fn = open(filename, "w")
if fn = -1 then
   wait(sprintf("Cant't create file '%s'.", {filename}))
   abort(1)
end if
puts(fn, "This is old text.\n")
close(fn)


-- Demo 1: "manually" set an old file time
dos_time = time_to_dos_time(eu_time)

error = set_filetime_DOS32(filename, dos_time)
if error then
   wait(sprintf("Cant't set time of file '%s'.", {filename}))
   abort(1)
end if
puts(1, "#1: success\n")


-- Demo 2: get the time of an arbitrary file,
--         change its contents and reset its time
dos_time = get_filetime_DOS32(filename)

fn = open(filename, "a")
if fn = -1 then
   wait(sprintf("Cant't open file '%s'.", {filename}))
   abort(1)
end if
puts(fn, "This is new text.\n")
close(fn)

error = set_filetime_DOS32(filename, dos_time)
if error then
   wait(sprintf("Cant't set time of file '%s'.", {filename}))
   abort(1)
end if
wait("#2: success\n")
-------------------------------------------------------------------

Regards,
   Juergen

-- 
Have you read a good program lately?