[fpc-pascal] FPC docs about FindFirst
freedos.la at gmail.com
Tue Sep 24 18:57:41 CEST 2019
On 9/24/2019 12:24 AM, Marco van de Voort wrote:
> Op 2019-09-24 om 03:03 schreef Ralf Quint:
>> systutils, so having documentation that includes the differences
>> between the versions would be helpful.
>> Turbo Pascal (for DOS) didn't have a FindClose function, as
>> "officially", this would not be necessary on DOS. On all other OS,
>> including Windows, for many, many years (I first stumbled about
>> missing "FindClose" call in OS/2 some time in the early '90s) and got
>> used to *alway**s* terminate a file search with it, even if it is in
>> the case of DOS just a dummy routine that just returns without doing
>> nothing. Saves a lot of headaches trying to find the source of
>> apparent memory leaks in larger applications that do a lot of of file
> Note that afaik Long File Name supporting versions of the Dos unit
> with Turbo Pascal did have findclose, as afaik the LFN apis required
> it too.
I don't recall that there was a "DOS" unit in Turbo Pascal that was LFN
aware, at least not as part of an official Borland distribution up to
Borland Pascal Professional 7.01, the last version that I bought way
back then. I just checked the Reference Manual... ;-)
I have personally never cared about LFN in pure DOS, don't know if it
was maybe part of Borland Pascal for Windows or in Delphi 1.02, but I
think FindClose was part of Delphi 3, which I didn't buy until I moved
to the US and then used on Windows 95 and NT 4. Checking RBIL states
that FindClose is an INT21h function required for Long Filenames
(AX=71A1h) but "this function is only available when IFSMgr is running,
not under bare MS-DOS 7"
I now remember that I stumbled across the FindClose issue when running a
BP7 program in an OS/2 DOS box, rather than true OS/2 program. And that
I found the reason/solution in a Beta (alpha?) version of Metrowerks
Codewarrior for OS/2, which I had access to for a while (to bad that
that never got officially released, it would have given Borland a run
for their money)...
This email has been checked for viruses by Avast antivirus software.
More information about the fpc-pascal