OpenEuphoria

Re: system() and copy in DOS

• Posted by Travis Beaty <tbeaty at osage.net> Jul 30, 2003
• 437 views

Hello!

Okay, thanks everyone.  Juergen, I'll look into the library.  I wanted 
to try to have all the include files be cross-platform, but it's now 
looking more like I'm going to have to make a separate include file 
which contains all the platform-specific code.  I guess that's okay, 
just not how I originally planned.

Thanks everyone!

Travis Beaty
Osage, Iowa.





Juergen Luethje wrote:
> 
> 
> Me wrote:
> 
> 
>>Rob wrote:
>>
>>
>>>Travis Beaty wrote:
>>>
>>>>In Linux, this works fine.  However, in Windows XP I'm having a bit of a
>>>>problem because the filename being copied is truncated to eight
>>>>characters.  Apparently it is a problem with long filenames, which as I
>>>>recall Euphoria has had some issues with in the past.  I don't think
>>>>that it is Euphoria though, because of the fact that Euphoria isn't
>>>>actually doing the copying, it is simply calling the DOS copy command
>>>>via a call to system().
>>>
>>>When you run the system() command in ex.exe,
>>>XP runs an old version of DOS that
>>>only supports 8.3 filenames.
>>
>>
>>In that situation, *long* filenames can be processed by using my library
>>"Lfn.zip" from the user contributions page.
>>Instead of
>>   system("del "  & bkname, 2)
>>   system("copy " & name & " " & bkname, 2)
>>
>>one has then to write
>>   system("del "  & short_name(bkname), 2)
>>   system("copy " & short_name(name) & " " & short_name(bkname), 2)
> 
>                                                ^^^^^^^^^^^^^^^^^^
> Oops. If forgot to mention, that this may not lead to the desired
> result. 'short_name(file)' only works as expected, if 'file' already
> exists. To achieve this, don't delete it before copying. If the
> destination file does *not* already exist, just let your program first
> create a small destination file with the desired long 'bkname'.
> 
> BTW: I personally prefer to let my program copy the data itself, using a
> small while() loop. I don't know, which method is faster.
> 
> 
>>>If you run system() using exw.exe
>>>(or exwc.exe - see euphoria\bin\makecon.exw)
>>>you'll get full support for long filenames.
> 
> 
> Best regards,
>    Juergen
>