TStringList->LoadFromFile throws exception

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TStringList->LoadFromFile throws exception

Postby mataus » Tue, 17 Jun 2008 08:23:31 GMT

Hello all.

I have problem with TStringList->LoadFromFile().  I have to make a program 
that shows information from text log file.  The file is always opened by a 
second program that keeps writtin .

When i call TStringList->LoadFromFile() i get exception "Cannot open file 
C:\Program Files\Company\event log.txt".  I think this is becuase log file 
is openned, by second program.  But notepad can open the file.

Can anyone help me?

matus 



Re: TStringList->LoadFromFile throws exception

Postby Remy Lebeau (TeamB) » Wed, 18 Jun 2008 02:08:38 GMT







TStrings::LoadFromFile() attempts to open the file with fmShareDenyWrite 
sharing rights specified.  Since your other app already has the file opened 
for writing, such access will always fail while the other app is using the 
file.  To get around it, you will have to use LoadFromStream() instead. 
That way, you can instantiate your own TFileStream with less restrictive 
sharing rights specified, ie:

    TFileStream *Stream = new TFileStream(FileName, fmOpenRead | 
fmShareDenyNone);
    try
    {
        Strings->LoadFromStream(Stream);
    }
    __finally
    {
        delete Stream;
    }


Gambit 



Re: TStringList->LoadFromFile throws exception

Postby Mark Jacobs » Wed, 18 Jun 2008 22:52:34 GMT





That is a lovely example. Thanks Remy.
-- 
Mark Jacobs
 http://www.**--****.com/  



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 with (Control as TListBox).Canvas do
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5.TSTringList LoadFromFile

"Chad Eddy" < XXXX@XXXXX.COM > wrote in message
news:3f15b185$ XXXX@XXXXX.COM ...
> I am using a TStringList to load files and do some file
> I/O on them.  This works with most files, but not with
> the .doc and .chm's that I try.

Those are not plain-text formats.  Well, .doc may be, but only if it is
encoded in RTF formatting.

> After the load from file, I have a count of 1 line, which
> has a small amount of charachters.

Probably because those formats have binary data in them that is preventing
LoadFromFile() from parsing the entire file.  LoadFromFile() only works
correctly for plain-text files.

> Is there something I have to do different for some files?

Yes - don't use TStringList for what you are trying to do.  Access the file
directly.


Gambit


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