Subject:
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Re: Post-processing huge [POV] text files in Delphi
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sat, 7 Sep 2002 14:02:17 GMT
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Viewed:
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361 times
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You could use the 'text' type and process the reading and writing line
by line manly insteat by using tstringlist, I asume.
quick code for quick copy:
var infile, outfile: text;
line: string;
assignfile(infile, 'bigfile.pov');
reset(infile);
assignfile(outfile, 'bigfile.~pov');
rewrite(outfile);
while not eof(infile) do
begin
readln(infile, line);
//do something with line
writeln(outfile, line);
end;
closefile(infile);
closefile(outfile);
You can also look into blockread and blockwrite in combination with type
'file' or tfilestream for binary reads and writes. It's harder to work
with strings then but it is much faster working with buffers.
Roland
Tore Eriksson wrote:
> Very often, I have just changed a little detail in a model converted to POV
> by L3P. Then after I run the model through L3P again, I have to manually set
> all the modifications not handled by L3P arguments again.
>
> I try to make a utility program to fix this problem automatically, but there
> is a problem.
>
> I have never been any good at making programs that are able to handle large
> files. Afraid of making memory alloction mistakes and too lazy to learn
> about it, I just the let my programs:
> * read the file line by line
> - edit/insert line if needed
> - copy line into a temp file
> * finally, if temp file is different from original file
> - delete original file
> - rename temp file into original file's name
> * if more files to process then open next and so on
>
> I find this method quite fool-proof, but not very effective, especially when
> processing POV files that often reach the size of 12 Mb and more. But I only
> know how to do this in C; in Delphi I use ReadFromFile and SaveToFile that
> are extremely easy to use but tend to fail when files are larger that 64k
> (or was it even 32k depending on with object the file content is read into?).
>
>
> Any help would be greatly appreviated.
> /Tore
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Message has 1 Reply:
 | | Re: Post-processing huge [POV] text files in Delphi
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| Thanks Roland! I think that's exactly what I was looking for. Sometimes I wish there were a dictionary or cross-reference for people that know what a keyword is named in one programming language. Pressing F1 is a good thing - but only when you know (...) (22 years ago, 7-Sep-02, to lugnet.cad.dev)
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Message is in Reply To:
| | Post-processing huge [POV] text files in Delphi
|
| Very often, I have just changed a little detail in a model converted to POV by L3P. Then after I run the model through L3P again, I have to manually set all the modifications not handled by L3P arguments again. I try to make a utility program to fix (...) (22 years ago, 7-Sep-02, to lugnet.cad.dev)
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