Appending Files - GameCreators Forum

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Quirkyjim

17

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Joined: 18th Oct 2008

Location: At my computer

Posted: 2nd Dec 2008 03:00

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I wrote a file like such:

+ Code Snippet

Function Append(date$, action$)

   open to read 3, "Logs\"+date$+"_log.log"

   temp1 = 1
   temp = 1
   repeat
      read string 3,null$

      inc temp

   until file end(3)

   temp2 = temp + 1
   dim null_reads$(temp2)

   repeat

      read string 3, null_reads$(temp1)
      inc temp1

   until file end(3)

   temp2 = temp1 + 1
   null_reads$(temp2) = action$

   for write_string = 1 to temp2

      [i]write string 3, null_reads$(write_string)[/i]

   [b]next write_string[/b]

   close file 3
   undim null_reads$(temp2)

endfunction

To write onto another file. However, it's not working. It goes to the line in bold and says that it can't write to a file. I think it means the one in talics though. Please help!

~QJ

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BN2 Productions

22

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Joined: 22nd Jan 2004

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Posted: 2nd Dec 2008 04:48

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You can't write to a file that was open to read. You have to open to write first. The problem with appending data, is that the open to write command will create a new file and cause an error if the file exists. To solve this you can a) make a new file and copy all data from the first to the second and then add stuff, or b)open to write at the beginning(of the program) and don't close the file.

Ever notice how in Microsoft word, the word "microsoft" is auto corrected to be "Microsoft" but "macintosh" just gets the dumb red underline?

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Quirkyjim

17

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Joined: 18th Oct 2008

Location: At my computer

Posted: 4th Dec 2008 21:59

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DUH!!!

+ Code Snippet

delete file "Logs\"+date$+"_log.log"

~QJ

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TDK

Retired Moderator

23

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Joined: 19th Nov 2002

Location: UK

Posted: 5th Dec 2008 18:17

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Quote: "To solve this you can a) make a new file and copy all data from the first to the second and then add stuff, or b)open to write at the beginning(of the program) and don't close the file."

There is a third option too.

At the start of your program, check to see if the file exists. If it does, load all the data into a string array. If it doesn't, then create the file.

During the program, add any new data to the end of the array.

At the end of the program (or any other preferred moment), delete the file, create a new file using the same name and write all the array data to it.

TDK

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