error with using strptime in c++

I've tried to understand use of strptime() in c++ and to be able to do it, I write a short code :

#include <time.h>
#include <iostream>
Test(string dtime)  
{
    string s = dtime;

    struct tm timeDate;
    strptime(s,"%y-%m-%d %H:%M", &timeDate);
    cout<<timeDate.tm_sec<<endl;
}

dtime will always be like 2013:03:15 16:08. I got the error it says that :

Test(std::string)’:
Test.cpp:17:41: error: cannot convert ‘std::string* {aka std::basic_string<char>*}’ to ‘const char*’ for argument ‘1’ to ‘char* strptime(const char*, const char*, tm*)

Is there anyone to help me to solve my problem ? Thanks in advance

Solution 1:

The declaration of strptime is:

char *strptime(const char *s, const char *format, struct tm *tm);

The first argument expects a const char *. You are passing a std::string

Convert s to a C style char *

strptime(s.c_str(),"%y-%m-%d %H:%M", &timeDate);