File pointer or pointer positioning

[Volkmaniac]

Knob showed me a way I could count occurrences of an item within a text file:

fopen 1 fname read text
While not feof 1
fgets 01 sLine
If strncmp sLine "CCXXXX" 6
A++
else
If strncmp sLine "CCXXA" 5
B++
else
If strncmp sLine "CCXB" 4
C++
else

Now I'd like to take things a step further. Is there a way I can conduct the same type of search but only on specific columns within a file? For instance, let's say I have a file layout that tells me that a two digit code is in position 220-221 of each record in a file. Is there a way I can tell the script to only search those specific positions?

 

[Volkmaniac]

Bingo,

It finally worked. The tabs are counted as positions and they go up to 1540 in the file. I would have never got it to work if you didn't tell me about the 2 bytes for carriage return.

All that work for this output:

05
05
05
05
02
05
07
05

It's still not recognizing eof but I could probably specify the number of times the loop can run. This could be very useful for extracting information from files:

fopen 0 "S:\Client Services\FASTDATA\1001\rec\RFIIAR2I" read
fseek 0 235 0
While not feof 0
fread 0 sDpv 2 len
termmsg "%s" sDpv
Termwrites "`n`r"
If strnicmp sDpv "01" 2
A++
else
If strnicmp sDpv "02" 2
B++
else
If strnicmp sDpv "03" 2
C++
else
Endif
Endif
Endif
ftell 0 FilePos
statmsg "File position = %ld" FilePos
fseek 0 1542 1
Endwhile
fclose 0


Thanks yet again for all your help

 

[knob]

Add this code after your fread command. It will check to see if the two-byte string is null. If so, then you are most likely at the end of the file:


if nullstr sDpv
exitwhile
endif

aspect@aspectscripting.com

http://www.aspectscripting.com