cocos2dx tolua传递参数分析：tolua_Cocos2d_CCNode_addChild00 == void CCNode::addChild(CCNode *child)tolua_Cocos2d_CCNode_addChild01 == void CCNode::addChild(CCNode *child, int zOrder)tolua_Cocos2d_CCNode_addChild02 == void CCNode::addChild(CCNode *child, int zOrder, int tag)上面是使用tolua把C++转到lua，上面三个分别对应不同的参数个数。我们这里分析一下最后一个：/* method: addChild of class CCNode */#ifndef TOLUA_DISABLE_tolua_Cocos2d_CCNode_addChild02static int tolua_Cocos2d_CCNode_addChild02(lua_State* tolua_S){ tolua_Error tolua_err; //这里判断参数是否合法，只能判断参数类型是否合法，如果参数类型检查不通过，就会报错 if (!tolua_isusertype(tolua_S,1,"CCNode",0,&tolua_err) ||!tolua_isusertype(tolua_S,2,"CCNode",0,&tolua_err) ||!tolua_isnumber(tolua_S,3,0,&tolua_err) ||!tolua_isnumber(tolua_S,4,0,&tolua_err) ||!tolua_isnoobj(tolua_S,5,&tolua_err) ) goto tolua_lerror; else { //例如：middleBg:addChild(testSprite, Z_ORDER_1, 200) //我们传递进来的参数和下面的一一对应 //这里可以清楚的看到传入参数的次序，第一是middleBg … CCNode* self = (CCNode*) tolua_tousertype(tolua_S,1,0); — middleBg — 1 CCNode* child = ((CCNode*) tolua_tousertype(tolua_S,2,0)); — testSprite — 2 int zOrder = ((int) tolua_tonumber(tolua_S,3,0));– Z_ORDER_1 — 3 int tag = ((int) tolua_tonumber(tolua_S,4,0));– 200– 4#ifndef TOLUA_RELEASE if (!self) tolua_error(tolua_S,"invalid 'self' in function 'addChild'", NULL);#endif { //这里就把testSprite加到了middleBg self->addChild(child,zOrder,tag); } } return 0;tolua_lerror: return tolua_Cocos2d_CCNode_addChild01(tolua_S);}#endif //#ifndef TOLUA_DISABLE例子：//middleBg:addChild(testSprite, Z_ORDER_1, 200) 在传递参数中，，我们没有对Z_ORDER_1赋值，即为nil，则就//出现了下面的错误，看下这里argument #3 ，表明是第三个参数错误，而这里我们明明是第二个参数，看下上面的分析//我想大家应该明白了，通过这种方法，我们以后查找这类问题，就会方便很多。03-31 10:09:50.499: D/cocos2d-x debug info(3169): LUA ERROR: [string "xxxxxxxxxxxxx…"]:171: error in function 'addChild'.03-31 10:09:50.499: D/cocos2d-x debug info(3169):argument #3 is 'nil'; '[no object]' expected.03-31 10:09:50.499: D/cocos2d-x debug info(3169): stack traceback:03-31 10:09:50.499: D/cocos2d-x debug info(3169): [C]: in function 'addChild'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx…"]:171: in function 'initMiddle'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx…"]:35: in function 'initUI'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx…"]:27: in function 'ctor'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx"]:34: in function 'create'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx"]:38: in function 'new'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx"]:44: in function 'pushScene'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx"]:309: in function 'callBack'03-31 10:09:50.499: D/cocos2d-x debug info(3169): [string "xxxxxxxxxxxxx"]:653: in function <[string "xxxxxxxxxxxxx"]:651>
任何的限制，都是从自己的内心开始的。
