Write To File Only If Blank - GameCreators Forum

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XdFZero

19

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Joined: 24th Oct 2004

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Posted: 6th May 2006 04:26

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Hello,

What I want to be able to do is, open the text file "log.txt" and write on the next line which has nothing on it.

For example, the "log.txt" has the current 2 lines in it:

Log Information 1
Log Information 2

now I want to add to the next line down, without deleting the first one.

I could do this command before I write to it:

open to read 1,"log.txt"
read string 1,Test1$
read string 1,Test2$
read string 1,Test3$
close file 1

and then do:

if Test1$ = ""
write string 1,"Log Information 3"
else
if Test2$ = ""
write string 1,"Log Information 3"
else
if Test3$ = ""
write string 1,"Log Information 3"
endif
endif
endif

however, this does work, but i am planning to have upto 40 lines.... and it would be easier to just find out if the line has nothin in it or not, and write if its free without doing this whole verfication....

Is their such command to do so?

Thanks you for your time.

Apperciate it!

I iz n00b

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TDK

Retired Moderator

21

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Joined: 19th Nov 2002

Location: UK

Posted: 6th May 2006 08:50 Edited at: 6th May 2006 08:51

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Simply use a string array:

+ Code Snippet

Dim TextLines$(1000): Rem Up to 1000 lines capacity
Open to read 1,"log.txt"
LineCounter=1
Repeat
  Read String 1,TextLines$(LineCounter)
  Inc LineCounter
Until File End(1)=1
Close file 1

Rem LineCounter now equals number of lines read in PLUS 1!

TextLines$(LineCounter) = "New Line Of Info"

Delete File "log.txt"
Open to Write 1,"log.txt"
For N=1 To LineCounter
  Write String 1,TextLines$(N)
Next N
Close file 1

I've just typed this in from memory so it's not been tested in DB. Should point you in the right direction though even if there is the odd error...

TDK_Man

DB Tutorials, Hints & Tips, Utils and lots more...
A New IDE For DB Classic!

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MartinS

18

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Joined: 15th Dec 2005

Location: Rochester, NY

Posted: 7th May 2006 09:48

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Are you using DarkBASIC Classic or Pro? In DarkBASIC Professional, the file must not exist, so therefore your code wouldn't work. I'm not sure about DB Classic, though.

Martin

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TDK

Retired Moderator

21

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Joined: 19th Nov 2002

Location: UK

Posted: 7th May 2006 19:24

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Quote: " Are you using DarkBASIC Classic or Pro? In DarkBASIC Professional, the file must not exist, so therefore your code wouldn't work. I'm not sure about DB Classic, though."

Is that regarding my code snippet?

If so, you should note the line:

Delete File "log.txt"

just before the Open to Write.