conver string to char * code example
Example 1: string to char*
std::string str = "string";
const char *cstr = str.c_str();
Example 2: java convert a string to char[]
String string = "ABCDEF" ;
char[] charsFromString = string.toCharArray(); // { 'A', 'B', 'C', 'D', 'E', 'F' }