Cocos2D-X - EXC_BAD_ACCESS (code=2, address=0x0) when initializing a CCTMXTiledMap

问题

I'm trying to create a game in Cocos2D-X with a tile map and I'm getting the below error:

EXC_BAD_ACCESS (code=2, address=0x0) in the line setContentSize(CCSizeZero); of the method CCTMXTiledMap::initWithTMXFile(const char *tmxFile)

I'm creating the tile map in this way:

tileMap->initWithTMXFile("TileMap.tmx");
this->background = tileMap->layerNamed("Background");

Somebody knows what it's happening?

Please, could you help me?

回答1:

Ok, I've found the problem. Just a little of theory:

EXC_BAD_ACCESS code=2 means that the pointer is corrupt and this could happen because:

• The pointer could have never been initialized.
• The pointer could have been accidentally written over because you overstepped the bounds of an array.
• The pointer could be part of an object that was casted incorrectly, and then written to.
• Any of the above could have corrupted a different pointer that now points at or near this pointer, and using that one corrupts this one (and so on).

So, in my case, I thought that initWithTMXFile was good enough to initialize the tileMap pointer but I was wrong. The solution is that first thing before initWithTMXFile, tileMap must be initialized. So, the correct block of code is:

this->tileMap = new CCTMXTiledMap();
this->tileMap->initWithTMXFile("TileMap.tmx");
this->background = tileMap->layerNamed("Background");
this->addChild(tileMap);

I hope it helps.

来源：https://stackoverflow.com/questions/16363513/cocos2d-x-exc-bad-access-code-2-address-0x0-when-initializing-a-cctmxtiledm