关于c ++：将std :: String转换为char *

Coverting std::String to char *

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我需要将字符串传递到只接受char*的socket send()函数中。所以我在这里尝试转换它：

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void myFunc(std::string str) //Taking string here const is good idea? I saw it on some examples on web
{
char *buf = str.c_str; //taking buf const is good idea?
std::cout << str;
}

int main()
{
const std::string str ="hello world";
myFunc(str);
return 0;
}

给出错误：

1	test.cpp:6:18: error: cannot convert ‘std::basic_string<_CharT, _Traits, _Alloc>::c_str<char, std::char_traits<char>, std::allocator<char> >’ from type ‘const char* (std::basic_string<char>::)()const’ to type ‘char*’