Converting String to Cstring in c++

问题

I am string to convert this string="apple", and want to put that into c-string of this style, char *c, that holds {a,p,p,l,e,'\0'}. Which Predefined method should I be using? Thank you ahead.

回答1:

.c_str() returns a const char*. If you need a mutable version, you will need to produce a copy yourself.

回答2:

vector<char> toVector( const std::string& s ) {
  string s = "apple";  
  vector<char> v(s.size()+1);
  memcpy( &v.front(), s.c_str(), s.size() + 1 );
  return v;
}
vector<char> v = toVector(std::string("apple"));

// what you were looking for (mutable)
char* c = v.data();

.c_str() works for immutable. The vector will manage the memory for you.

回答3:

string name;
char *c_string;

getline(cin, name);

c_string = new char[name.length()];

for (int index = 0; index < name.length(); index++){
    c_string[index] = name[index];
}
c_string[name.length()] = '\0';//add the null terminator at the end of
                              // the char array

I know this is not the predefined method but thought it may be useful to someone nevertheless.

来源：https://stackoverflow.com/questions/11821491/converting-string-to-cstring-in-c