将MoMu + stk添加到我的cocos2d项目中会导致解析问题

Question

I am trying to follow the tutorial http://arivibes.com/realtime-audio-on-ios-tutorial-making-a-mandolin/ and when I simply added the following to my .h:

#import <AudioToolbox/AudioToolbox.h>
#include "Stk.h"
#include "Mandolin.h"

and the following to my .mm:

#import "mo_audio.h"

I get "Parse Issue Expected unqualified-id" and "Parse Issue expected ')'". The error comes from the following line in Stk.h:

const StkFloat TWO_PI = 2 * PI;

...

I should also mention, the .h and .mm files that I added those import/includes to are not the AppDelegate or ViewController as the tutorial showed, but rather my game's main CCLayer class.

Answer 1

Aha.. The problem was that I was including both the MoMu API and Stk.. MoMu's mo_def.h also defined TWO_PI, so I modified Stk.h to:

#ifndef TWO_PI
const StkFloat TWO_PI = 2 * PI;
#endif

And that solved the problem.

Answer 2

I suspect there is an issue with your Stk distribution, since in Stk.h I can read:

const StkFloat PI           = 3.14159265358979;
const StkFloat TWO_PI       = 2 * PI;

and everything should be fine. You can check what you have there.

As a workaround, try changing that PI into:

M_PI

or add:

#define PI M_PI

in some of your header files. But this would not explain what is happening.