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char *m_char = new char[n+1];
string m_string = "abcdefg";
int n = m_string.size();
char *m_char = new char(n + 1);
strncpy(m_char, m_string.c_str(), n);
m_char[n] = '\0';
...
delete[] m_char; //记得不在需要m_char时,要释放内存哦