[Tutorial] How to read and write to a file in Turing

[unknowngiver]

hey
what if i want to write to a file without overwriting the current stuff...and also wt if iwant to overwrite SOME of the file but not all

for example

lets say on my program where users can change the OPTIONS of the game..

the OPTIONS are saved in a file called options.txt

so it may look like
options.txt:

code:

skin = "redmonster" language = "english" background_music = "bg.mid" bg_image = "bg.jpg"

and the user goes to the options and changes ONLY the skin to something else..let say "blue"
how would i make it so thts the only thing tht changes??

[Cervantes]

You'd probably cycle through your data file until you reach the line that defines the skin colour, then overwrite it with the new line.

Note, however that that line has a certain number of bytes (one byte per character). You cannot change the number of bytes that line has (since that would screw up following lines). Thus, you must make sure the line you are inserting is less than or equal to the current line. If the replacement line is shorter, pad it with spaces.

You will need to use the mod option when opening the file:

code:

open : file_stream, "filename.txt", put, mod

[seawad_]

When I try to do:

put : file, "Hi, I like to eat hamburgers"

Turing says:

Put attempted on incompatible stream number 1.

Please help.
I would like to know how to fix this problem.

[Tony]

how are you initializing your file variable?

[ylcc23]

When ever I try to open the .txt file I need for my program, I get syntax error at 'end'. Expected '.' I'm not sure what is causing the syntax error, as I used the code from this tutorial. Error occurs at end loop. I think it has something to do with the colon in my get, but I'm not entirely sure.

Turing:

proc instructions     var file : int     open : file, "checkers instructions.txt", put, mod     loop         exit when eof (file)         get : file     end loop end instructions

[Insectoid]

your get instruction is missing something.

[ylcc23]

I've tried a different way of reading the file, but it returns a blank screen. Not sure why it won't work.

Turing:

proc instructions     open : file, "checkers instructions.txt", get     assert file > 0     for i : 1 .. 2         exit when eof (file)         get : file, list (i)     end for     close : file end instructions

[Insectoid]

Well that code doesn't output anything, so there's nothing to write to the screen.

[ylcc23]

I've added in a put statement but all that does is print 2 in the top left corner of my screen. Any advice?

Turing:

proc instructions     open : file, "checkers instructions.txt", get     assert file > 0     for i : 1 .. 2         exit when eof (file)         get : file, list (i)     end for     put file     close : file end instructions

[Insectoid]

Putting a file will not output the contents of that file. You need to put the variables that you stored the contents of file in.

[Raknarg]

As a side note, you are getting 2 because 'file' is an integer, and all it stores is a streamID