cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   zon7
   Member

   I have been playing with the code for Box2d and everything went ok. But when I try to make a new project from the template ot goes wrong.
   First I create the project and compile. No problems
   Then I add the folder "external/Box2d" to the headers search path, and then #import "Box2D.h" into the HelloWorldScene.h
   It brings a lot of errors. Most of them are solved if I rename the .m files as .mm (or change them to FileType "sourcecode.cpp.objcpp".
   But there are still two errors.
   "Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.0 failed with exit code 1"

   I have tryed linking the "libbox2d.a" generated from the cocos2d-iphone project but no luck there.

   Can anyone help?

   Posted 2 years ago #
2. 

   natanavra
   Member

   I've experienced the error gcc error myself, I didn't use anything, I opened the template erased the Helloworld Scene stuff and created my own scene, and initalized,
   and it linked me to a warning about an init method, which I call:

   - (id)init {
      if(self = [super init]){ // Warning is here.... "...parenthasis.."
   
      }
      return self;
   }

   That doesn't happen with 0.8.

   Anyone experienced this before? Riq?

   Posted 2 years ago #
3. 

   riq
   Key Master

   - (id)init {
      if((self = [super init])){ // use 2 parenthesis, instead of 1
   
      }
      return self;
   }

   By default, the template treats all warnings as errors, so you might want to disable it if you are going to use box2d, since the box2d code has many many warnings.

   Posted 2 years ago #
4. 

   natanavra
   Member

   If I may ask Riq, why are 2 parentesis required? does the initialization code returns something else in 0.8.1??
   It basically assigns the super calls initialize to self, and checks if self != nil so what's wrong with 1 parentesis??
   Sorry for being ignorant...

   Posted 2 years ago #
5. 

   riq
   Key Master

   it's to distinguish the assignment from the evaluation. the if from the =

   Posted 2 years ago #
6. 

   adunsmoor
   Member

   As riq said, the compiler is trying to help you in case you meant "==" instead of "=".
   Consider the following code:

   int value = 32;
     // ...
     if (value = GetDefaultValue()) {
       // ...
     }

   Is that a bug? Did I mean to assign the default value to value or did I mean to compare value against the default value? It's a fairly easy bug to introduce but can be very hard to diagnose. So the compiler writers chose to issue a warning when it occurs. The extra set of parenthesis signal to the compiler that you intended to do the assignment.

   For more details take a look at the -Wparenthesis section at
   http://developer.apple.com/documentation/developertools/gcc-4.2.1/gcc/Warning-Options.html

   Posted 2 years ago #
7. 

   jbishop
   Member

   could someone respond to the original posters question? I am also having trouble with integrating box2d.

   -thanks

   Posted 2 years ago #
8. 

   tjweir
   Member

   @jbishop Did you try?
   "By default, the template treats all warnings as errors, so you might want to disable it if you are going to use box2d, since the box2d code has many many warnings. "

   Posted 2 years ago #
9. 

   jbishop
   Member

   For the record:
   1) include box2d.h
   2) rename .m -> .mm
   3) build libbox2d.a
   4) add framework
   5) add search path to box2d.h
   6) disable warnings as errors

   That seems to be the last step... how do I do it?

   -thx!

   Posted 2 years ago #
10. 

    jbishop
    Member

    aha... was looking for a checkbox, but is under 'user-defined'; compiles fine now (with 19 warnings) (RESOLVED)

    Posted 2 years ago #
11. 

    kenny
    Member

    Hi,

    What steps should we execute for version 0.8.1?? I am getting about 3K errors :-( . Please let me know what I am missing.

    I have the Box2D and updated my "Header Search Paths" with "." and clicked recursive. But no luck.

    Thanks,

    Kenny

    Posted 2 years ago #
12. 

    steve
    Member

    What steps should we execute for version 0.8.1?? I am getting about 3K errors :-( . Please let me know what I am missing.

    I'm not sure about 0.8.1, but I've seen that many errors with Box2D when a file ended in .m instead of .mm (for C++).

    Posted 2 years ago #
13. 

    kenny
    Member

    Thanks Steve. The extension is .mm....

    -Kenny

    Posted 2 years ago #

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