How to specify last line in "File.read$"

[Zim]

Hi;
Is there a way to specify to read the last line in a text file? I can't use a specific line number cause lines will get added.

EQ. ret$ = FILE.READ$(MYFILE.TXT, LAST_LINE) (would be nice)


Thanks Zim

[Zim]

I got this to work:

Code: [Local Link Removed for Guests]

lineNum = 1
FOR i=1 to 50
Dt$ = file.read$("/test.txt", lineNum)
dt = val(Dt$)
if dt <> 0 then
             lineNum = (lineNum + 1)
            else
            lineNum = (lineNum - 1)
           EXIT FOR
    endif
next i
Dt$ = file.read$("/test.txt", lineNum)
wlog Dt$

[PeterN]

I had the same problem with slow reading when searching for the actual line number.
So I narrowed down the first empty line first in large steps and then in finer steps to find the highest line number

Code: [Local Link Removed for Guests]

 
 GET_MAX_LINENUMBER_FROM_FILE:
'=========================================================================
filename$="/MY_FILE.TXT"
' my file has a content of more than 400 lines with  at least a three digit linenumber and some text
' reading it line by line last about 15s.
 'So I shortened that a bit

LINE_STEP            = 50 
MAX_LINENUMBER = 0
WLOG "Please wait ###########################################"
if file.exists(filename$) then
 ' first in rough steps up to behind the file boundary, because it reads very very slowly in steps of one.
 do
     MAX_LINENUMBER = MAX_LINENUMBER + LINE_STEP
    XX$=FILE.READ$(filename$,MAX_LINENUMBER)
    wlog "ROUGH TESTING ----> MAX_LINENUMBER=",MAX_LINENUMBER, " in file : "; filename$
  loop until len(XX$) < 6
  MAX_LINENUMBER = MAX_LINENUMBER - LINE_STEP
  
  'now starting from the determined rough position, read individual lines 
  do
    MAX_LINENUMBER = MAX_LINENUMBER + 1
    XX$=FILE.READ$(filename$,MAX_LINENUMBER)
  loop until len(XX$) < 6
  MAX_LINENUMBER = MAX_LINENUMBER - 1
  WLOG "###########################################"
  wlog "MAX_LINENUMBER=",MAX_LINENUMBER, " in file : "; filename$
endif
return