output.txt

λ:~/src clang++ -o test_static_cast ./test_static_cast.cpp 
./test_static_cast.cpp:7:42: error: no matching conversion for static_cast from 'std::string' (aka 'basic_string<char>') to 'std::vector<unsigned char>'
    std::vector<unsigned char> new_str = static_cast<std::vector<unsigned char> >(test_string);

test_static_cast.cpp

#include <cstdio>
#include <string>
#include <vector>

int main(int argc, char *argv[]) {
    std::string test_string = "Hello, world!";
    std::vector<unsigned char> new_str = static_cast<std::vector<unsigned char> >(test_string);
    printf("%s\n", new_str);
}

went with:

  string strAddrOrPubKey = params[0].get_str();
  std::vector<unsigned char> vchAddrOrPubKey(strAddrOrPubKey.length() +1 );
  std::copy(strAddrOrPubKey.c_str(), strAddrOrPubKey.c_str() + strAddrOrPubKey.length() + 1, vchAddrOrPubKey.begin());