Getting a line from a text file with a variable

[UtahCode197]

Hi,
Is there a way of getting a certain line set by a variable and putting it into a field.
I've got the code below but it returns a compiling error:

Code: Select all

put line sVariable of URL "file:/list.txt" into field "result"

And also...is there a way to store the amount of lines that are in a file as a variable?

Thanks

[Klaus]

Hi Rory,

hm, the script looks OK!? Sure the pathname is correct?
The leading / is puzzling me a bit and try with an absolute pathname.

Just made a test and this works fine:

Code: Select all

on mouseUp
   put specialfolderpath("desktop") & "/testtext.txt" into tFile
   put 2 into sVariable
   put line sVariable of URL ("file:" & tFile) 
end mouseUp

Got the correct line in the message box!

Here the answer to your questions:

Code: Select all

on mouseUp
   ## Add your pathname here:
   put specialfolderpath("desktop") & "/testtext.txt" into tFile

   ## Read the file completely!
   put URL ("file:" & tFile) into tCompleteFile

   ## Now extract your line:
   put 2 into sVariable
   put line sVariable of tCompleteFile into fld "result"

   ## Put the number of lines into the variable tNumOfLines:
   put the num of lines of tCompleteFile into tNumOfLines
end mouseUp

Best

Klaus

[UtahCode197]

I think I've spotted the problem. I was trying to put the thumbPosition of a scrollbar as the value of sVariable but I think it hasn't worked. How would I do this. I've just tried setting sVariable to thumbPosition in code under the scrollbar and then using sVariable as you've shown me but it's not working. Do you know how I can make this work?

Thanks so far

[Klaus]

Hi Rory,

...
put the thumbpos of sb "your scrollbar here..." into sVariable
...
should do the trick!

Hint:
I use a lot of valid abbreviations, lazy moi
cd = card
sb = scrollbar
btn = button
grp = group
grc = graphic
bg = background
fld = field


Best

Klaus

P.S.
Here some really great learning resources for the basics of Livecode:
http://www.hyperactivesw.com/revscriptc ... ences.html

[SparkOut]

The thumbpos may not be an integer, therefore you could not (say) get line 1.7 of the file.
If you round the thumbpos value in the variable, does that work?