convert string to long long

Question

Hi, I'm using VS 2008 to create a C++ DLL (not managed) project and I need convert a char* to a long long type. Is there an easy way to do it?

Thanks in advance :)

Answer 1

Try _atoi64. This takes char* and returns __int64.

Answer 2

The easiest way is to use the std::stringstream (it's also the most typesafe...)

std::stringstream sstr(mystr);
__int64 val;
sstr >> val;

You may need to target a 64-bit application for this to work.

C++ FAQ

Answer 3

If you're using boost, lexical_cast is the way to go, in my opinion.

long long ll = boost::lexical_cast<long long>(mystr)

Answer 4

Asked and answered soooo many times: See: http://stackoverflow.com/questions/200090/how-do-you-convert-a-c-string-to-an-int