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Dr.Disrespect
Grandmaster Cheater
![]() Reputation: 3
Joined: 17 Feb 2016
Posts: 526
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 Posted: Sat Jun 10, 2017 1:02 pm Post subject: Why tonumber() returns nil? |
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| Code: |
List = createStringlist() <----create the string list
local f = io.open("d:\\ID_Info.txt","r") <-------- then get the file
io.input(f)
local str = io.read("*all") <-------- read the file into a string
for i in string.gmatch(str, "%S+") do <---- get rid of whitespace
List.add(i) <-----------the string list is filled correctly
end
f:close()
print(List[0]) <-----this returns "1", which is correct
print(type(List[0])) <----------- this returns string ,which is also correct
print(tonumber(List[0])) <---------this returns nil, which is wrong, but why?????????????
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I have been working on this for an hour, but still can't figure out the problem. Please take a look at the code, my question is in the comments, thanks a lot.
Edit: I fixed the problem by doing the following:
1. Add an empty line in the file;
2. use the number "1" as the first index.
The txt file looks like this:
1 12312321
2 234345432534
3 23432443
......
1036 234234324
The first column is the line number, the second is some string data.
_________________
**************
A simple example is better then ten links. 
Last edited by Dr.Disrespect on Sat Jun 10, 2017 2:42 pm; edited 3 times in total |
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mgr.inz.Player
I post too much
 Reputation: 218
Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00
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| Posted: Sat Jun 10, 2017 2:40 pm Post subject: |
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c:\ID_Info.txt contains 1500100900
| Code: | List = createStringlist()
local f = io.open("c:\\ID_Info.txt","r")
local str = f:read("*all")
for i in string.gmatch(str, "%S+") do
List.add(i)
end
f:close()
print(List[0])
print(type(List[0]))
print(tonumber(List[0])) |
output:
| Code: | 1500100900
string
1500100900
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Dr.Disrespect
Grandmaster Cheater
![]() Reputation: 3
Joined: 17 Feb 2016
Posts: 526
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| Posted: Sat Jun 10, 2017 2:43 pm Post subject: |
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| mgr.inz.Player wrote: | c:\ID_Info.txt contains 1500100900
| Code: | List = createStringlist()
local f = io.open("c:\\ID_Info.txt","r")
local str = f:read("*all")
for i in string.gmatch(str, "%S+") do
List.add(i)
end
f:close()
print(List[0])
print(type(List[0]))
print(tonumber(List[0])) |
output:
| Code: | 1500100900
string
1500100900
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|
Thanks for the reply. I think my problem was related to the content in the file. The content looked like this:
| Code: |
1 sadfadsf
2 234243
3 adfadf
.....
1036 32424324
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The first column is the line number, the second is some data.
After I added one empty line at the beginning, and used "1" as the first index, the problem was gone.
_________________
**************
A simple example is better then ten links. |
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