cocos2d iphone - Getting EXC_BAD_ACCESS signal received when i tried to get collision detection -

i stuck @ position , don't know went wrong in this,

i have enabled arc in project. , made softbody follows

ball.h

    b2body *body[num_segment];     ccsprite *ball; 

ball.mm

    ball = [ccsprite spritewithfile:@"ball1.2.png"];     ball.tag = 1;       for(int i=0;i<num_segment;i++){         float theta = deltaangle*i;         float x = radius * cosf(theta);         float y = radius * sinf(theta);         b2vec2 circleposition = b2vec2(x/ptm_ratio,y/ptm_ratio);         b2bodydef bodydef;         bodydef.type = b2_dynamicbody;         bodydef.position = (center + circleposition);         bodydef.userdata = &ball;         body[i] = world->createbody(&bodydef);         outerbodyfixture[i]=body[i]->createfixture(&fixturedef);         [bodies addobject:[nsvalue valuewithpointer:body[i]]];     } 

and have given physics tiles follows,

tile.h

ccsprite *tile; 

tile.mm

tile = [layer1 tileat:ccp(i, j)]; tile.tag = 0; b2bodydef tiledef; tiledef.type = b2_staticbody; tiledef.position.set((tile.position.x+(tile.contentsize.width/2))/(ptm_ratio), (tile.position.y + (tile.contentsize.height/2))/ptm_ratio); tiledef.userdata = &tile; tilebody = world->createbody(&tiledef); 

now tried catch collision detection , have made code print tag number of colliding bodies. code follows,

std::vector<mycontact>::iterator pos;     (pos=_contactlistener->_contacts.begin();          pos != _contactlistener->_contacts.end(); ++pos) {         mycontact contact = *pos;          b2body *bodya = contact.fixturea->getbody();         b2body *bodyb = contact.fixtureb->getbody();         if (bodya->getuserdata() != null && bodyb->getuserdata() != null) { 

at point getting error: exc_bad_access

        ccsprite *spritea = (__bridge ccsprite *) bodya->getuserdata(); 

at point getting error: exc_bad_access

        ccsprite *spriteb = (__bridge ccsprite *) bodyb->getuserdata();               printf("contact :%d \n",spriteb.tag);         }     } 

don't know whats wrong code,,give me solution this

your problem store in userdata pointer pointer rather pointer itself.

tile pointing ccsprite instance , &tile points pointer ccsprite instance making casting incorrect.

so change :

tiledef.userdata = tile;