Question

我正在使用cocos2d创建一个iPhone应用程序，每次我尝试从函数返回一个变量，我在下面的代码中得到运行时错误...

     GB2ShapeCache *cache = [GB2ShapeCache sharedShapeCache];
    //EXC_BAD_ACCESS run time error here
    *eggFixture = [cache addFixturesToBody:body forShapeName:@"egg3"];

我不知道我做错了什么......这是addFixturesToBody的代码...

-(b2Fixture) addFixturesToBody:(b2Body*)body forShapeName:(NSString*)shape
{
    BodyDef *so = [shapeObjects objectForKey:shape];
    assert(so);
    b2Fixture *Fixi;
       FixtureDef *fix = so->fixtures;
    while(fix)
    {
        Fixi = body->CreateFixture(&fix->fixture);
        fix = fix->next;
    }

    return *Fixi;
}

在这里我定义了我的变量eggFixture

b2Fixture *eggFixture;

这是我稍后尝试使用b2fixture eggFixture的地方

for(pos = _contactListener->_contacts.begin(); 
        pos != _contactListener->_contacts.end(); ++pos) {
        MyContact contact = *pos;

        if ((contact.fixtureA == locations.platformFixture && contact.fixtureB == eggFixture) ||
            (contact.fixtureA == eggFixture && contact.fixtureB == locations.platformFixture)) {
            NSLog(@"Ball hit bottom!");
        }
    }

有任何帮助吗？谢谢你：）

Answer 1

看起来body是零。当身体为零时，它肯定会崩溃：

Fixi = body->CreateFixture(&fix->fixture);

This article has some tips for debugging issues like EXC_BAD_ACCESS.

变量返回运行时错误

1 个答案: