reading/writing

[Bunny_Man_OC]

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

[Cervantes]

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?

[Bunny_Man_OC]

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"

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?

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)

[Bunny_Man_OC]

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"

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?

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

[Cervantes]

You should learn how to use flexible arrays. That oughta solve all your problems, I think.

[Bunny_Man_OC]

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

[[Gandalf]]

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?

[Bunny_Man_OC]

[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)

[Clayton]

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

[Bunny_Man_OC]

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 Turing Walkthrough

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