如何将十六进制字符串转换为unsigned long？

Question

I have following hex value

CString str;
str = T("FFF000");

How to convert this in to an unsigned long ?

Answer 1

You can use strtol function which works on regular C strings. It converts a string to a long using a specified base:

long l = strtol(str, NULL, 16);

details and good example: http://www.cplusplus.com/reference/clibrary/cstdlib/strtol/

Answer 2

#include <sstream>
#include <iostream>

int main()
{

    std::string s("0xFFF000");
    unsigned long value;
    std::istringstream iss(s);
    iss >> std::hex >> value;
    std::cout << value << std::endl;

    return 0;
}