[c++] How to copy std::string into std::vector<char>?

Possible Duplicate:
Converting std::string to std::vector<char>

I tried:

std::string str = "hello";
std::vector<char> data;
std::copy(str.c_str(), str.c_str()+str.length(), data);

but it does not work=( So I wonder How to copy std::string into std::vector<char> or std::vector<uchar> ?

You need a back inserter to copy into vectors:

std::copy(str.c_str(), str.c_str()+str.length(), back_inserter(data));