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TokenHerbz

Tue Apr 25, 2006 6:19 pm


searching and retriving specific information in a file.

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Hey, i was looking threw some tut's and didn't find anything to help me, and neither did that F10...

So i ask, can you read and write informaion in a spefic spot?

meaning:

i have a file: i want to add to it, line2, "this is a test", then again line 3" another test"

now i want to read just line 2, not line 1 or 3...  and get my vars (strings)

Anyways, anything to help me would be pleasent...


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TokenHerbz

Tue Apr 25, 2006 6:23 pm



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I cant edit:  I wanted to add this cause my previous post is a little hard to understand maybe,

i want to read and write by lines in the file


line 1
line 2
line 3


each line should have 3 vars in my program..

I want to beable to access only certain lines when needed, be able to add more, and delete them.    Sorry for that post :(  no edit tho.


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Cervantes

Tue Apr 25, 2006 6:27 pm



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You can use seek and tell in tandem to move to different parts of your file. However, even with these tools you cannot jump directly to a given line (unless you know how many bytes in a given line is).

You can cycle through lines, storing them in a temp variable, until you get the desired line.

As for adding more, you just have to open the file with the mod option.

open : file_stream, get, put, mod
I think that's the syntax.


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MysticVegeta

Tue Apr 25, 2006 6:40 pm



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I think that's the syntax.
not really


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TokenHerbz

Tue Apr 25, 2006 7:27 pm



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that  says:      "I think that's the syntax."  (for people with bad eyes)


well i will try with these tools, any other info would be nice.


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TokenHerbz

Tue Apr 25, 2006 7:45 pm



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EDIT:

Cervantes wrote:
[code]
 (unless you know how many bytes in a given line is). 
[code]

Can i check how many letters and spaces there are up to the givin line and use that info to determin where to start reading?

[code]
var1 var2 var3
var4 var5 var6
var7 var8 var7
%%all differnent length strings :P
[/code]

even if i found away to start reading at var 4, how do i only read var4, var5, var6???   and leave everything else there.


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Cervantes

Tue Apr 25, 2006 8:14 pm



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Sorry, forgot the filename.

var file_no : int
open : file_no, "foo.txt", put, get, mod


TokenHerbz: If you're at line 2 (var4), then just read the whole line to get var4, var5, and var6. You can use : * to get the whole line then break it up yourself, or you can omit the : * to get data separated by spaces.

If you don't want to read the vars after var6, you just don't read/get them.


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MysticVegeta

Wed Apr 26, 2006 1:39 pm



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that  says:      "I think that's the syntax."  (for people with bad eyes)


you know you could just copy it and paste it anywhere else to see what that means right?