| Author |
Message |
< Erlang ~ Writing to text file |
| ishmael |
 Posted: Mon Aug 25, 2008 9:59 am |
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Joined: 23 Jul 2008
Posts: 9
Location: RSA
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Hi,
I have been trying to write data to text file, but with no luck. I have data a list of record that I want to write to text file(comma separated style).
I have tried using file:open(S, "~w~n", write). can you help?Code: {person, {name, surname, age, interests}}.
{person, {john, dow, 23,[soccer, polo]}}.
{person, {dan, Calr, 43,[music, games]}}.
{person, {saun, Ben, 21,[soccer, rugby]}}.
Code: I want the output file to look like.
[color=red]john, dow, 23, soccer, polo[/color] all data in lines |
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| michal |
| Posted: Wed Aug 27, 2008 10:17 am |
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User
Joined: 20 Jul 2006
Posts: 44
Location: London
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Hi,
What does it mean "no luck"? Did you get a crash? I would guess that you get undef crash, because there is no file:open function that would accept 3 arguments. Read here http://www.erlang.org/doc/man/file.html#open-2 and you will see that file:open function can only accept 2 arguments.
To write some data to a file you will need to format it. io:format/3 could be used for this (http://www.erlang.org/doc/man/io.html#format-3)
Code:
R1 = #person{name=john, surname=dow, age=23, interests=[soccer, polo]},
{ok, FileDescriptor} = file:open("output.txt", [write]),
io:format(FileDescriptor, "[color=red]~w, ~w, ~w, ~w[/color]~n",
[R1#person.name, R1#person.surname, R1#person.age, R1#person.interests]),
file:close(FileDescriptor).
Michal |
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http://www.erlang-consulting.com |
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| rkewlani |
| Posted: Mon Sep 22, 2008 6:24 am |
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User
Joined: 10 Sep 2008
Posts: 11
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hi,
If you want to write some data to a file, say to "a.txt"
then you can follow this approach-
1.open the file in append mode
{ok, WriteDescr} = file:open(a.txt, [raw, append]),
2.write the data on file
file:write(WriteDescr,"data to be written"),
3.close the file
file:close(WriteDescr). |
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| timrila |
| Posted: Tue Jun 12, 2012 8:45 am |
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Joined: 28 Mar 2012
Posts: 32
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| goods |
| Posted: Fri Jun 29, 2012 2:06 am |
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Joined: 28 Jun 2012
Posts: 14
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| dongdongwu |
| Posted: Thu Sep 20, 2012 5:41 am |
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Joined: 19 Sep 2012
Posts: 236
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