How to convert a hex string to an unsigned long?

Question

I have following hex value

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

How to convert this in to an unsigned long?

score 12 · Answer 1 · answered May 09 '11 at 08:22

12

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/

answered May 09 '11 at 08:22

Adam

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I think he might actually want `stroul` or `stoul` since he wants an `unsigned long`. – ThisGuyCantEven Nov 21 '21 at 01:05

score 11 · Accepted Answer · answered May 09 '11 at 08:32

11

#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;
}

answered May 09 '11 at 08:32

hidayat

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Shouldn't that be `std::setbase(16)` or `std::hex`? – ildjarn May 09 '11 at 08:34

How to convert a hex string to an unsigned long?

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