Question about append to a file

Ben_101July 22, 2008 at 10:12 AM#

Hello all,
I am completely new in scripting an installer, and I would to open a file to write 1 line at the end of it.

I have created a function:
Function writeLogFile ;
ClearErrors
FileOpen $0 $INSTDIR\file.dat a
IfErrors done
FileWrite $0 "new text"
FileClose $0
done:
FunctionEnd

But this write always the line on the first line of the file.
Can someone help me on this ?
Thanks !

pospecJuly 22, 2008 at 10:15 AM#

Try FileSeek after opening the file: http://nsis.sourceforge.net/Reading_...iting_in_files

LoRd_MuldeRJuly 22, 2008 at 10:16 AM#

Re: Question about append to a file

Originally posted by Ben_101
Hello all,
I am completely new in scripting an installer, and I would to open a file to write 1 line at the end of it.

I have created a function:
Function writeLogFile ;
ClearErrors
FileOpen $0 $INSTDIR\file.dat a
IfErrors done
FileWrite $0 "new text"
FileClose $0
done:
FunctionEnd

But this write always the line on the first line of the file.
Can someone help me on this ?
Thanks !

Do it like this 😉

Function writeLogFile

  ClearErrors

  FileOpen $0 $INSTDIR\file.dat a

  IfErrors done

  FileSeek $0 0 END          ; <-- Set pointer to the end of the file

  FileWrite $0 "new text"

  FileWrite $0 "$\r$\n"      ; <-- Add carriage return

  FileClose $0

  done:

FunctionEnd

pospec was faster 😁

Ben_101July 23, 2008 at 10:17 AM#

This is working fine now.
Thank you for your help !