Conversion between char [] array, char * pointer, STD: string *

In the small game of cocos2d-x, the char * type string needs to be forcibly converted to void * pointer type, passed to the callback function through cccallfuncnd.

It is possible to find this:

// (A) is created using a string in double quotation marks.

Enemy * enemy = enemy: Create (this, "enemy/enemy2r.png ");

...

// (B) initialize

_ Bornaction = ccsequence: Create (ccanimate: Create (blastanimation ),
Cccallfuncnd: Create (this, callfuncnd_selector (tank: borncallback), (void *) filename ),
Null );

...

// (C) callback function

Char * STR = (char *) data;

The above method is acceptable. However, if you replace (a) with the following string:

Char STR [64] = {0 };
Sprintf (STR, "enemy/enemy1_dr.png", random );
Enemy * enemy = enemy: Create (this, STR );

In this case, the data obtained in the callback function is empty (for unknown reasons, do not spray the data ).

You can convert char * to STD: string * and then to void *. The data obtained by the callback function is normal. As follows:

_ Bornaction = ccsequence: Create (ccanimate: Create (blastanimation ),
Cccallfuncnd: Create (this, callfuncnd_selector (tank: borncallback), (void *) (new STD: string (filename ))),
Null );

...

// Callback

STD: string * STR = (STD: string *) data)-> c_str ();

The converted data will be normal. I do not know the specific reason. I guess there may be some differences between char [], char *, and "ABC.