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YZ
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 Posted: Sun Jan 16, 2005 4:14 am Post subject: newbie Q about text files read/write |
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Hi,
how do I open text file for both read and write? reset(F) opens it for
reading only, while append(F) opens it for write only. It should be
something simple, but navigating delphi's help system is a hurdle in itself.
Thanks in advance
YZ
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Jud McCranie
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| Posted: Sun Jan 16, 2005 6:13 am Post subject: Re: newbie Q about text files read/write |
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On Sun, 16 Jan 2005 04:14:19 GMT, YZ <z@***.ohio-state.edu> wrote:
| Quote: | how do I open text file for both read and write? reset(F) opens it for
reading only, while append(F) opens it for write only. It should be
something simple, but navigating delphi's help system is a hurdle in itself.
|
I don't think a text file can be opened for both reading and writing,
although other kinds of files can.
---
Replace you know what by j to email
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Tom de Neef
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| Posted: Sun Jan 16, 2005 9:35 am Post subject: Re: newbie Q about text files read/write |
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"YZ" <z@***.ohio-state.edu> schreef in bericht
news:vSlGd.1246$e64.110 (AT) fe2 (DOT) columbus.rr.com...
| Quote: | Hi,
how do I open text file for both read and write? reset(F) opens it for
reading only, while append(F) opens it for write only. It should be
something simple, but navigating delphi's help system is a hurdle in
itself.
|
And rewrite(F) opens it for writing only too.
Textfiles are handled different from other files.
A convenient way of using them is to store the file in a Tstringlist and do
all the processing on that list.
myText:=Tstringlist.create;
myText.loadFromFile(filename); // reads the complete file
myText.add('a new string');
myText.delete(anyIndex);
myText.saveToFile(filename); // writes the lot back to disk
myText.free;
Note that for parameter storing, TiniFile is very convenient.
Tom
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J French
Guest
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| Posted: Sun Jan 16, 2005 9:39 am Post subject: Re: newbie Q about text files read/write |
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On Sun, 16 Jan 2005 04:14:19 GMT, YZ <z@***.ohio-state.edu> wrote:
| Quote: | Hi,
how do I open text file for both read and write? reset(F) opens it for
reading only, while append(F) opens it for write only. It should be
something simple, but navigating delphi's help system is a hurdle in itself.
|
Could you explain what you want to do
It might be that a TStringList or TFileStream is what you really need
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YZ
Guest
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| Posted: Sun Jan 16, 2005 5:47 pm Post subject: Re: newbie Q about text files read/write |
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J French wrote:
| Quote: | On Sun, 16 Jan 2005 04:14:19 GMT, YZ <z@***.ohio-state.edu> wrote:
Hi,
how do I open text file for both read and write? reset(F) opens it for
reading only, while append(F) opens it for write only. It should be
something simple, but navigating delphi's help system is a hurdle in itself.
Could you explain what you want to do
It might be that a TStringList or TFileStream is what you really need
|
I am writing a little utility for editing LaTeX bibliography files
(.bib), which are just text files with strings like this:
@ARTICLE{key,
Author={Author Name},
Title={Article Title},
Journal={Journal title},
Volume={Volume #},
Year={year},
Pages={123-456} }
etc..
I want to be able to add an entry to the file (this already works), to
delete an entry from the file, find entry in the file by one of the
fields (key, author, title, etc..), and edit the found entry. For that I
think I need the .bib file open for both write and read.
I will give it a try with TStringList. Thanks everyone.
YZ
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J French
Guest
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| Posted: Mon Jan 17, 2005 9:16 am Post subject: Re: newbie Q about text files read/write |
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On Sun, 16 Jan 2005 17:47:14 GMT, YZ <z@***.ohio-state.edu> wrote:
| Quote: | J French wrote:
On Sun, 16 Jan 2005 04:14:19 GMT, YZ <z@***.ohio-state.edu> wrote:
Hi,
how do I open text file for both read and write? reset(F) opens it for
reading only, while append(F) opens it for write only. It should be
something simple, but navigating delphi's help system is a hurdle in itself.
Could you explain what you want to do
It might be that a TStringList or TFileStream is what you really need
I am writing a little utility for editing LaTeX bibliography files
(.bib), which are just text files with strings like this:
@ARTICLE{key,
Author={Author Name},
Title={Article Title},
Journal={Journal title},
Volume={Volume #},
Year={year},
Pages={123-456} }
etc..
I want to be able to add an entry to the file (this already works), to
delete an entry from the file, find entry in the file by one of the
fields (key, author, title, etc..), and edit the found entry. For that I
think I need the .bib file open for both write and read.
I will give it a try with TStringList. Thanks everyone.
|
It looks as if you are messing around with an entire Text file
- a TStringList will work for that
Another alternative is to load the whole lot into one large String and
mess around with the directly using things like Pos() and PosEx()
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YZ
Guest
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| Posted: Mon Jan 17, 2005 8:06 pm Post subject: Re: newbie Q about text files read/write |
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Yes, I got it to work with TStringList. Thanks everyone once again.
YZ
| Quote: |
It looks as if you are messing around with an entire Text file
- a TStringList will work for that
Another alternative is to load the whole lot into one large String and
mess around with the directly using things like Pos() and PosEx()
|
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