LineRead

Author: Instructor (talk, contrib)

Page for NSIS 2.07 and below users

You can use the latest version of headers (recommended) or the following function code (put the function code in your script before calling it)

Function Description

____________________________________________________________________________
 
                            LineRead v1.2
____________________________________________________________________________
 
Thanks Afrow UK (Based on his idea of Function "ReadFileLine")
 
 
Get line in file specified with number.
 
 
Syntax:
${LineRead} "[File]" "[LineNumber]" $var
 
"[File]"         ; Input text file
                 ;
"[LineNumber]"   ; [No|-No]
                 ;   3    line number from start
                 ;   -5   line number from end
                 ;
$var             ; Result: Line
 
 
Note:
-Error flag if input file isn't exists
-Error flag if line number not found

Example:

Section
	${LineRead} "C:\a.log" "-1" $R0
	; $R0="Last line$\r$\n"
SectionEnd

Function Code

Function LineRead
	!define LineRead `!insertmacro LineReadCall`
 
	!macro LineReadCall _FILE _NUMBER _RESULT
		Push `${_FILE}`
		Push `${_NUMBER}`
		Call LineRead
		Pop ${_RESULT}
	!macroend
 
	Exch $1
	Exch
	Exch $0
	Exch
	Push $2
	Push $3
	Push $4
	ClearErrors
 
	IfFileExists $0 0 error
	IntOp $1 $1 + 0
	IntCmp $1 0 error 0 plus
	StrCpy $4 0
	FileOpen $2 $0 r
	IfErrors error
	FileRead $2 $3
	IfErrors +3
	IntOp $4 $4 + 1
	Goto -3
	FileClose $2
	IntOp $1 $4 + $1
	IntOp $1 $1 + 1
	IntCmp $1 0 error error
 
	plus:
	FileOpen $2 $0 r
	IfErrors error
	StrCpy $3 0
	IntOp $3 $3 + 1
	FileRead $2 $0
	IfErrors +4
	StrCmp $3 $1 0 -3
	FileClose $2
	goto end
	FileClose $2
 
	error:
	SetErrors
	StrCpy $0 ''
 
	end:
	Pop $4
	Pop $3
	Pop $2
	Pop $1
	Exch $0
FunctionEnd