1. open file?
When I use Rob's built-in file open to open a binary file.
When I write a block of data to the file I get a message
Critical Error: Abort, Retry, Ignore, Fail? ( in WIN95 dos )
When I open a binary for r/w using Jacques DosOpen in doswrap.e
which uses #3D02 or #716C functions there is no error ?
What file open function is Eu using and what mode numbers do the mode
sequence really represent ???
Bernie
2. Re: open file?
This is the problem with file open
When I use the builtin open I get a file handle of 3
When I use Jacques DosOpen in doswrap.e I get a file handle of 5
If I open 2 dummey files before opening my binary file to force it
to be file handle 5 then I can write to it without the error message.
Bernie
3. Re: open file?
You didn't specify how you are opening the file but I assume the
following.
integer handle
handle = open("filename.ext", "rb") or "wb" but you should be using "ub" for
random data files.
PS: Just a hunch. (Really, more info. is needed to combat your problem)
Lucius L. Hilley III
lhilley at cdc.net
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> ---------------------- Information from the mail
header -----------------------
> Sender: Euphoria Programming for MS-DOS
<EUPHORIA at LISTSERV.MUOHIO.EDU>
> Poster: Bernie Ryan <bwryan at PCOM.NET>
> Subject: open file?
> --------------------------------------------------------------------------
-----
>
> When I use Rob's built-in file open to open a binary file.
>
> When I write a block of data to the file I get a message
>
> Critical Error: Abort, Retry, Ignore, Fail? ( in WIN95 dos )
>
> When I open a binary for r/w using Jacques DosOpen in doswrap.e
>
> which uses #3D02 or #716C functions there is no error ?
>
> What file open function is Eu using and what mode numbers do the mode
>
> sequence really represent ???
>
>
> Bernie
>
4. Re: open file?
Bernie Ryan writes:
> Critical Error: Abort, Retry, Ignore, Fail?
That's what happens when you write to a file that's already
open for some other purpose.
> When I use the builtin open I get a file handle of 3
> When I use Jacques DosOpen in doswrap.e I get a file handle of 5
The file handle number returned by DosOpen is not meant to be
the same as the file handle number returned by Euphoria's open().
If there's some relationship, it's just a coincidence, and should not
be relied on.
Why are you trying to use DosOpen?
In his comments Jacques assumes that loading a file into
memory with normal Euphoria operations is slow.
This is a myth. Do some measurements before you
decide that you need DosOpen. You'll probably
only save a few milliseconds, and your code won't
be portable to Windows or Linux.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
5. Re: open file?
On Fri, 4 Feb 2000 14:55:32 -0500, Robert Craig <rds at ATTCANADA.NET> wrote:
>The file handle number returned by DosOpen is not meant to be
>the same as the file handle number returned by Euphoria's open().
>If there's some relationship, it's just a coincidence, and should not
>be relied on.
>
>Why are you trying to use DosOpen?
>In his comments Jacques assumes that loading a file into
>memory with normal Euphoria operations is slow.
>This is a myth. Do some measurements before you
>decide that you need DosOpen. You'll probably
>only save a few milliseconds, and your code won't
>be portable to Windows or Linux.
>
>Regards,
> Rob Craig
> Rapid Deployment Software
> http://www.RapidEuphoria.com
Rob:
Then How do I write binary block structures to disks; a byte at a time ??
If a file handle is not standard then how will Euphoria ever be able to
use files when another application has them open under conflicting
handles. That means that a user also can only do things with files
that use built-in features. ( which aren't always there )
Thanks
Bernie
6. Re: open file?
Bernie Ryan writes:
> Then How do I write binary block structures to disks;
> a byte at a time ??
Using puts() you can write one byte, or a sequence of bytes at
one time. The data is buffered into an 8K chunk in memory before
the operating system is asked to write it to disk. You can write
a pretty large file in less than a second.
> If a file handle is not standard then how will Euphoria
> ever be able to use files when another application has
> them open under conflicting handles. That means
> that a user also can only do things with files that use
> built-in features. ( which aren't always there )
If the built-in file functions aren't good enough, you will
have to use DOS interrupts or WIN32 or
Linux API routines to open and manipulate the file.
So far I've seen very few cases where this was useful,
and none where it was necessary.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
7. Re: open file?
On Fri, 4 Feb 2000 17:04:01 -0500, Robert Craig <rds at ATTCANADA.NET> wrote:
>Using puts() you can write one byte, or a sequence of bytes at
>one time. The data is buffered into an 8K chunk in memory before
>the operating system is asked to write it to disk. You can write
>a pretty large file in less than a second.
Rob
Puts is for writing sequences. I have a binary block of memory that
I want to write to disk. Do I have to convert this block to a sequence
to write it to disk ?? What is the point of having binary files in
Euphoria if I have to convert everything to a sequence to write it
to disk ?? Maybe I'am missing something ??
Bernie
8. Re: open file?
- Posted by Robert Craig <rds at ATTCANADA.NET>
Feb 04, 2000
-
Last edited Feb 05, 2000
Bernie Ryan writes:
> Puts is for writing sequences. I have a binary block of memory
> that I want to write to disk. Do I have to convert this block to a
> sequence to write it to disk ?? What is the point of having
> binary files in Euphoria if I have to convert everything to a
> sequence to write it to disk ?? Maybe I'am missing something ??
puts(fn, peek({start, nbytes}))
If it takes more than a fraction of a second, let us know.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
9. Re: open file?
- Posted by Bernie Ryan <bwryan at PCOM.NET>
Feb 04, 2000
-
Last edited Feb 05, 2000
Thank You
That is ok
Bernie
