QString,char,string之间赋值

1)QString赋值给char *

    QString q_str;

    char *str = q_str.toLatin1().data();

2)char [] 赋值给string

    char str[20];

    string str1(str);

3)char *赋值给QString

    char *str;

    QString q_str;

    q_str += str;