Read, edit a single line in a file?

Morphie · 25th July 2002, 19:31

Is it possible for NSIS to edit a single line in a file? Like overwrite line 2 of runmefirst.bat with "move ..\setup\*.* .\setup32"

kichik · 25th July 2002, 19:56

You will have to read the file using FileRead line by line and write to another temporary file, using FileWrite. When you reach the desired line write the line you want to replace it instead of the line read. After you write your line, continue reading and writing like before. Then just replace the old file with the temporary file.

Morphie · 25th July 2002, 22:29

That... is confusing.

Could you give me an example?

kichik · 26th July 2002, 11:49

PHP Code:


			
FileOpen $0 "file.txt" r

GetTempFileName $R0

FileOpen $1 $R0 w

loop:

   FileRead $0 $2

   IfErrors done

   StrCmp $2 "line to replace$\r$\n" 0 +3

      FileWrite $1 "replacement of line$\r$\n"

      Goto loop

   FileWrite $1 $2

   Goto loop



done:

   FileClose $0

   FileClose $1

   Delete "file.txt"

   CopyFiles /SILENT $R0 "file.txt"

   Delete $R0

Morphie · 26th July 2002, 17:23

THAT one helps! Thanks!

25th July 2002, 19:31	#1
Morphie Junior Member Join Date: May 2001 Location: Somewhere, I'm not sure... Posts: 9	Read, edit a single line in a file? Is it possible for NSIS to edit a single line in a file? Like overwrite line 2 of runmefirst.bat with "move ..\setup\. .\setup32"

25th July 2002, 19:56	#2
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	You will have to read the file using FileRead line by line and write to another temporary file, using FileWrite. When you reach the desired line write the line you want to replace it instead of the line read. After you write your line, continue reading and writing like before. Then just replace the old file with the temporary file. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

26th July 2002, 11:49	#4
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	PHP Code: `FileOpen $0 "file.txt" r GetTempFileName $R0 FileOpen $1 $R0 w loop: FileRead $0 $2 IfErrors done StrCmp $2 "line to replace$\r$\n" 0 +3 FileWrite $1 "replacement of line$\r$\n" Goto loop FileWrite $1 $2 Goto loop done: FileClose $0 FileClose $1 Delete "file.txt" CopyFiles /SILENT $R0 "file.txt" Delete $R0` NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

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25th July 2002, 22:29	#3
Morphie Junior Member Join Date: May 2001 Location: Somewhere, I'm not sure... Posts: 9	That... is confusing. Could you give me an example?

26th July 2002, 17:23	#5
Morphie Junior Member Join Date: May 2001 Location: Somewhere, I'm not sure... Posts: 9	THAT one helps! Thanks!