Comments for fydo.net

Comment on Sprite Merge (merge.py) by Ram K.

Ram K. — Fri, 24 Jun 2011 22:41:22 +0000

the following is what I did to get this working on python 3.2:
1.get:
PIL-1.1.7.win32-py3.2.‌exe
from:
http://www.lfd.uci.edu/~gohlke/pythonlibs/#pil
2. install it…
3. replace “print “Processing: ” + arg” with print (“Processing: “, arg) in merge.py.
4. go through the rest of the print statements and add parentheses so “print ‘Unknown option.’” becomes print (‘Unknown option.’) and so on…

profit

Comment on a tutorial on ‘dynamic’ arrays in C by tavaris

tavaris — Tue, 17 May 2011 21:30:31 +0000

Lets say you have to dynamically allocate an array of structs and you have to read a number in from an input file that tells you how big the array is going to be. How would you do that?

Comment on a tutorial on ‘dynamic’ arrays in C by Erik

Erik — Thu, 12 May 2011 18:21:01 +0000

@ulrich: While you’re right in that the pointer address might change as a new region in memory is allocated, realloc guarantees that the data is moved properly and the old memory freed. Thus, you don’t need to copy the data yourself (it is an error to do this: you’re accessing memory that has been free’d by realloc()).

Comment on a tutorial on ‘dynamic’ arrays in C by fydo

fydo — Wed, 16 Mar 2011 15:57:31 +0000

Frank,

I’m not getting any of those errors when compiling the code example using GCC 4.4.3. What compiler are you using?

Comment on a tutorial on ‘dynamic’ arrays in C by Frank

Frank — Wed, 16 Mar 2011 13:22:15 +0000

This code is giving a bunch of warnings and errors when trying to compile it:

test.c:4: warning: parameter names (without types) in function declaration
test.c: In function ‘addToArray’:
test.c:40: error: ‘num_elements’ undeclared (first use in this function)
test.c:40: error: (Each undeclared identifier is reported only once
test.c:40: error: for each function it appears in.)
test.c:40: error: ‘num_allocated’ undeclared (first use in this function)
test.c:48: error: ‘the_array’ undeclared (first use in this function)

The errors seem obvious, but I’m wondering how you’re using the function to avoid them? Seriously, when you make a tutorial like this, it would be a good idea to include an actual working example of implementing it.

Comment on Sprite Merge (merge.py) by Spritesheet Tool

Spritesheet Tool — Thu, 06 Jan 2011 09:07:10 +0000

[...] A friend of mine has a simple script tool for joining images up into sprite sheets. It is nice, but I didn’t want to deal with a command line thing every time and I wanted the process to be more accessible to users, so I created a GUI spritesheet tool in wxPython. [...]

Comment on a tutorial on ‘dynamic’ arrays in C by Martin Broadhurst

Martin Broadhurst — Mon, 18 Oct 2010 15:48:03 +0000

I should add that the main disadvantage of dynamic arrays is that each time you reallocate, the contents of the buffer need to be copied. If your array starts off small and gets very large, this copying can really impact on performace.
One solution is to have a dynamic array of arrays, and store the elements in the arrays. When you run out of space, you just add another array. You can have the size of each array larger than the previous one, so that you still double the capacity at each allocation, but no copying is involved.
I have written an implementation of this strucure here:
http://www.martinbroadhurst.com/articles/list-as-a-dynamic-array-of-increasing-sized-arrays.html

Comment on a tutorial on ‘dynamic’ arrays in C by Martin Broadhurst

Martin Broadhurst — Wed, 13 Oct 2010 08:23:06 +0000

Good work!
If you want to be able to use more than one dynamic array in a program, it’s a good idea to turn the array into a struct type.
You can store elements of any type if you make the array an array of void pointers.
I’ve written an implementation which you can find here:
http://www.martinbroadhurst.com/articles/dynamic-array.html

Comment on a tutorial on ‘dynamic’ arrays in C by glicholas

glicholas — Tue, 14 Sep 2010 18:26:48 +0000

By using this example I was able to implement an array made of doubles to represent x and y coordinates. I was able to read in an unknown amount and take all data. It worked for thousands and thousands of members. This is the most clear and precise example I was able to find anywhere on the net. Thanks a bunch!

Comment on a tutorial on ‘dynamic’ arrays in C by Nilesh

Nilesh — Sat, 31 Jul 2010 15:50:16 +0000

Man thanks a million!
I was struggling with dynamic structure array since last three days!
This tutorial has helped me like anything.
Thanks Thanks Thanks Thanks.