dizou
14th September 2011 17:07 UTC

Having trouble with appending to end of file
This is the code I have:

    Var /GLOBAL Log
    StrCpy $Log "$DESKTOP\Uninstall_Log.txt"
    Var /GLOBAL LogFile
    FileOpen $LogFile $Log w
    FileWrite $LogFile "Uninstall Log$\r$\n"
    FileClose $LogFile

    ;Do some other stuff

    FileOpen $LogFile $Log a
    FileWrite $LogFile "Version: $Version$\r$\n"
    FileClose $LogFile

However, when this code executes, all I see in the file is this:

Version: 6.3

Why is it not appending to the file?

MSG
14th September 2011 17:13 UTC

It's all in the manual: http://nsis.sourceforge.net/Docs/Chapter4.html#4.9.5.2

"In all open modes, the file pointer is placed at the beginning of the file."

dizou
14th September 2011 17:15 UTC

Ah ok. So can I keep the file open throughout the whole script? If in between the NSIS FileWrite calls, I append stuff to the file by another means, will the file pointer move as I append? or will it stay at the last NSIS append?

Edit: I can use FileSeek to do this?

Afrow UK
14th September 2011 20:01 UTC

Yes, use FileSeek (see http://nsis.sourceforge.net/Simple_write_text_to_file). If it is only the installer that is writing to the file, you may keep the file handle open for the full duration of the install. Have you thought about using the logging build of NSIS too?

Stu