问题
Possible Duplicate:
How do I tokenize a string in C++?
Hello I was wondering how I would tokenize a std string with strtok
string line = "hello, world, bye";
char * pch = strtok(line.c_str(),",");
I get the following error
error: invalid conversion from ‘const char*’ to ‘char*’
error: initializing argument 1 of ‘char* strtok(char*, const char*)’
I'm looking for a quick and easy approach to this as I don't think it requires much time
回答1:
I always use getline for such tasks.
istringstream is(line);
string part;
while (getline(is, part, ','))
cout << part << endl;
回答2:
std::string::size_type pos = line.find_first_of(',');
std::string token = line.substr(0, pos);
to find the next token, repeat find_first_of but start at pos + 1.
回答3:
You can use strtok by doing &*line.begin() to get a non-const pointer to the char buffer. I usually prefer to use boost::algorithm::split though in C++.
回答4:
strtok is a rather quirky, evil function that modifies its argument. This means that you can't use it directly on the contents of a std::string, since there's no way to get a pointer to a mutable, zero-terminated character array from that class.
You could work on a copy of the string's data:
std::vector<char> buffer(line.c_str(), line.c_str()+line.size()+1);
char * pch = strtok(&buffer[0], ",");
or, for more of a C++ idiom, you could use a string-stream:
std::stringstream ss(line);
std::string token;
std::readline(ss, token, ',');
or find the comma more directly:
std::string token(line, 0, line.find(','));
来源：https://stackoverflow.com/questions/12627262/c-tokenize-std-string