Computer Science Canada

reading/writing

Author:	Bunny_Man_OC [ Mon Dec 25, 2006 1:51 am ]
Post subject:	reading/writing
im making a game on turing, and i need to draw a line behinde my ship, but the line isn't exactly... permannent, so i decided to right the directions the ship goes to a file... but i need to read it as well... if i close the file so i cna read it, then it will right over hwat whas written befor,e and it wont work properly. is there a way to have it read and write to a file at the same time?? or maybe transfer teh contents of one file to another, so that i can read from the new file, w/o having to close teh old file?? any help or otehr idea's would be appreciated

Author:

Cervantes [ Tue Dec 26, 2006 9:47 am ]

Post subject:

It is possible to open a file and append information to it. Do it like this:

code:

var f : int
open : f, "foo.txt", put, mod, seek

seek : f, *
put : f, "hello"

You could perhaps also do some tricks with File.Copy.

However, I wonder if using a file is the best idea. Why not just store your information in a (flexible) array? What does the data look like. Is it really really big?

Author:

Bunny_Man_OC [ Tue Dec 26, 2006 3:54 pm ]

Post subject:

Cervantes wrote:

It is possible to open a file and append information to it. Do it like this:

code:

var f : int
open : f, "foo.txt", put, mod, seek

seek : f, *
put : f, "hello"

the data is stored as a string, I store the direction that the ship has moved.

i tried to make an array and store the direction to an array. but the array would have to add subscripts to itself... and i didn't kow how to add one to it, so i was put using a counter and declaring an array every time an acion was taken. and then giving it a value .

code:

procedure storeDirection
if up = true then
count += 1
var direction : array 1 .. count of string
direction (count) := "up"
elsif down (etc..)
end storeDirection

i really wasn't sur eif that was a good idea, and figured it would probably flood the program with variables... or if it did work, that it would delete the previous entries, and make a new array, and only write data rto the last slot.

so i figured that using a dat file and writng information to it would be the best way to do it. then i could write the direction taken, and read it later so i could draw (from the ships starting point) a line in every directiuon it took. (since the ship moves "speed" pixels in one direction every move)

Author:

Bunny_Man_OC [ Tue Dec 26, 2006 3:56 pm ]

Post subject:

Cervantes wrote:

It is possible to open a file and append information to it. Do it like this:

code:

var f : int
open : f, "foo.txt", put, mod, seek

seek : f, *
put : f, "hello"

i tried the seek thing, and it keeps saying "put attempted on incompatable stream number 1" so i must have done something wrong... Embarassed

Author:	Cervantes [ Tue Dec 26, 2006 4:12 pm ]
Post subject:
You should learn how to use flexible arrays. That oughta solve all your problems, I think.

Author:	Bunny_Man_OC [ Wed Dec 27, 2006 7:39 pm ]
Post subject:
Cervantes wrote: You should learn how to use flexible arrays. That oughta solve all your problems, I think. thanks for the help its much appreciated... I've read the first half... i have to understand multi-dimensional arrays befor ei can understand how to operate a flexible multi dimentional one. so I shall read up on it in the turing help reference

Author:	[Gandalf] [ Wed Dec 27, 2006 7:46 pm ]
Post subject:
Woah woah woah... Flexible multi dimensional array? You're bound to run into more than a few problems with that, seeing as how Turing's support of such arrays is limited/non-existent. Why exactly do you need an array with multiple dimensions in the first place?

Author:	Bunny_Man_OC [ Wed Dec 27, 2006 9:03 pm ]
Post subject:
[Gandalf] wrote: Woah woah woah... Flexible multi dimensional array? You're bound to run into more than a few problems with that, seeing as how Turing's support of such arrays is limited/non-existent. Why exactly do you need an array with multiple dimensions in the first place? well, i'm usig the array to draw a line on the screen. each subscript will equal a direction, and i'll us the directions to draw the line out. this line is technically temporary, but when the ship touches a boarder, it becomes permanent, so i can use a multi dimentional array for drawing a new line. he said you can change one of the upper bounds, as long as you leave the otehr one alone, so tahts what I'll do. and this way I can draw out a bunch of different lines. unless someone can think of a better way to do this. i thought it seemed logical, but i guess there might be an easier way to do it. but since i redraw the playing grid every loop, i need something like this to ensure all of the lin is srawn again (since the line might be odd hsapes and not just one big line from point a to b)

Author:	Clayton [ Wed Dec 27, 2006 10:01 pm ]
Post subject:
Why not use records? that way you can keep a flexible array of coordinates for each of the lines, that way you don't have to worry about a second dimension. Check for the tutorial in the Turing Walkthrough

Author:	Bunny_Man_OC [ Wed Dec 27, 2006 10:07 pm ]
Post subject:
Freakman wrote: Why not use records? that way you can keep a flexible array of coordinates for each of the lines, that way you don't have to worry about a second dimension. Check for the tutorial in the <a href="http://www.compsci.ca/v2/viewtopic.php?t=8808">Turing Walkthrough</a> i guess I can try that out... but ive never quite understood how to use records all that well, so i guess a tutorial on em wouldn't be that bad of an idea right now

You can syndicate this boards posts using the file backend.php or view the topic map using sitemap.php.

Terms of Use | Privacy Policy