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Dr.Disrespect
Grandmaster Cheater
![]() Reputation: 3
Joined: 17 Feb 2016
Posts: 526
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 Posted: Fri Apr 15, 2016 10:46 am Post subject: Lua I/O question. |
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I want to read stuff from a txt file with the name "123".
For example, in 123.txt, the characters are:
| Code: |
abcd
efgh
ijkl
mnop
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To be more specific, there are four lines and each line has 4 characters. If I want to read the third character of each line. How to do that? I only know I may need to use "io.line" combined with "io.read". 
Now I use io.read() to read the whole file and then use "string.sub()" to read the third characters of each line by manually counting their position in the file, for example "c = #t +3", "g = #t +8", #t is the length of all the characters. It must be a better way than this.
Thanks in advance.
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Redouane
Master Cheater
![]() Reputation: 3
Joined: 05 Sep 2013
Posts: 363
Location: Algeria
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| Posted: Fri Apr 15, 2016 11:23 am Post subject: Re: Lua I/O question. |
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| fmanager wrote: | I want to read stuff from a txt file with the name "123".
For example, in 123.txt, the characters are:
| Code: |
abcd
efgh
ijkl
mnop
|
To be more specific, there are four lines and each line has 4 characters. If I want to read the third character of each line. How to do that? I only know I may need to use "io.line" combined with "io.read".
Now I use io.read() to read the whole file and then use "string.sub()" to read the third characters of each line by manually counting their position in the file, for example "c = #t +3", "g = #t +8", #t is the length of all the characters. It must be a better way than this.
Thanks in advance. |
| Code: | local file = io.open('123.txt','r');
for line in file:lines() do
print('third character is '..line:sub(3,3))
end |
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Dr.Disrespect
Grandmaster Cheater
![]() Reputation: 3
Joined: 17 Feb 2016
Posts: 526
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| Posted: Fri Apr 15, 2016 11:25 am Post subject: Re: Lua I/O question. |
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| Redouane wrote: | | fmanager wrote: | I want to read stuff from a txt file with the name "123".
For example, in 123.txt, the characters are:
| Code: |
abcd
efgh
ijkl
mnop
|
To be more specific, there are four lines and each line has 4 characters. If I want to read the third character of each line. How to do that? I only know I may need to use "io.line" combined with "io.read".
Now I use io.read() to read the whole file and then use "string.sub()" to read the third characters of each line by manually counting their position in the file, for example "c = #t +3", "g = #t +8", #t is the length of all the characters. It must be a better way than this.
Thanks in advance. |
| Code: | local file = io.open('123.txt','r');
for line in file:lines() do
print('third character is '..line:sub(3,3))
end |
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Thank you so much, I have been stuck with this issue for a while. 
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