egghelp/eggheads community

Read/Write specific line

2003-10-08T23:18:10-04:00

i can't be sur because i don't know what the imput is i tryed various combinations

like file start end ..

i get stuff like this is not an integer ..

i know that doens't make the script wrong its me i know that but just not sur what this exactly means

# Usage: replaceLines [replacement data (optional)]

Statistics: Posted by Ofloo — Wed Oct 08, 2003 11:18 pm

Read/Write specific line

2003-10-08T19:30:36-04:00

could you give me a write syntax cause ive been reading the manual on lreplace and trying to understand it but i am affraid my knowledge about this topic isn't what it supposed to be to understand the therms that are being used ?

so what is the input syntax for your script ? i always get funny out puts :/

I wrote a line on how to use the last two procs (re-read my post). There might be bugs in my code though (I didn't test it iirc ) Give me a example of what you're doing and what you expect as a result and I'll try to help you on the right track

Statistics: Posted by user — Wed Oct 08, 2003 7:30 pm

Read/Write specific line

2003-10-08T19:28:54-04:00

proc getLine {file line} {lindex [split [read [set f [open $file]]][close $f] \n] $line}
Heh why do you obfuscate things so much? There's really nothing wrong with using a few more lines

Actually, in this case the "ubfuscation" was for a reason. If I were to store the contents of the file in a variable, the proc would require 2*[file size $file] to execute (because a copy of the data is passed along to the commands when variable substitution is performed (at least that's how it is in older tcl versions))

Statistics: Posted by user — Wed Oct 08, 2003 7:28 pm

Read/Write specific line

2003-10-08T16:48:11-04:00

could you give me a write syntax cause ive been reading the manual on lreplace and trying to understand it but i am affraid my knowledge about this topic isn't what it supposed to be to understand the therms that are being used ?

so what is the input syntax for your script ? i always get funny out puts :/

Statistics: Posted by Ofloo — Wed Oct 08, 2003 4:48 pm

Read/Write specific line

2003-09-28T14:22:47-04:00

might sound stupid, but i am supposed to open the file write before i do this and close after ... and do i require to use it in a while or just like that ...

# Fetch a single line
proc getLine {file line} {lindex [split [read [set f [open $file]]][close $f] \n] $line}

Statistics: Posted by Ofloo — Sun Sep 28, 2003 2:22 pm

Read/Write specific line

2003-09-28T14:17:39-04:00

tnx verry mutch ima try it test it abuse it .. and ill let you know if something is wrong hehe

Statistics: Posted by Ofloo — Sun Sep 28, 2003 2:17 pm

Read/Write specific line

2003-09-27T20:05:08-04:00

# Fetch a single line
proc getLine {file line} {lindex [split [read [set f [open $file]]][close $f] \n] $line}

Heh why do you obfuscate things so much? There's really nothing wrong with using a few more lines :)

Statistics: Posted by stdragon — Sat Sep 27, 2003 8:05 pm

Read/Write specific line

2003-09-26T21:32:31-04:00

Code:

# Fetch a single lineproc getLine {file line} {lindex [split [read [set f [open $file]]][close $f] \n] $line}# Insert data at the given line# Accepts the same values for line number as 'linsert' does for index (check your manual)# Will create the file if it doesn't exist.proc addLine {file line data} {if {[file readable $file]} {set d [split [read [set f [open $file r+]]] \n]seek $f 0} {set d ""set f [open $file w]}puts -nonewline $f [join [linsert $d $line $data] \n]close $f}# Replace one or more lines# Usage: replaceLines    [replacement data (optional)]# Accepts the same values for indexes as 'lreplace' (check your manual)proc replaceLines {args} {if {[llength $args]>=3} {foreach {file start end} $args breakset cmd [list lreplace [split [read [set f [open $file r]]] \n] $start $end]close $fif {[llength $args]>3} {lappend cmd [lindex $args 3]}puts -nonewline [set f [open $file w]] [join [eval $cmd] \n]close $f} {error "wrong # args: should be \"[lindex [info level 0] 0] file start end ?replacement?\""}}

...btw: line numbers are zero-based, like lists, meaning the first line is called "0"

Statistics: Posted by user — Fri Sep 26, 2003 9:32 pm

Read/Write specific line

2003-09-26T17:51:43-04:00

How do i read a specific line from txt and or change it like i read line 5 and or i want to write to line 5 .. the reading i can do with counter and while but writing how would i do that ?

Statistics: Posted by Ofloo — Fri Sep 26, 2003 5:51 pm