Re: ftdi_eeprom_get_strings() failure when the device has no serial number

[David Walton <dwaltoneng@xxxxxxxxx>]

The cpp wrapper also has problems when the device does not have a serial number.

The following code was run with a single usb device attached. The device does not have a serial number:

#include "ftdi.hpp"
#include <iostream>
#include <iomanip>

int main(int argc, char **argv)
{
    int vid = 0x0403, pid = 0x6010;

    Ftdi::Context context;
    Ftdi::List *list = Ftdi::List::find_all(context, vid, pid);
    for (Ftdi::List::iterator it = list->begin(); it != list->end(); it++)
    {
        std::cout << "Test1 " << it->vendor() << ", " << it->description() << std::endl;
        std::cout << "Test2 " << it->vendor() << ", " << it->description() << std::endl;
        std::cout << "Test3 " << it->vendor() << ", " << it->description() << ", " << it->serial() << std::endl;
        std::cout << "Test4 " << it->vendor() << ", " << it->description() << ", " << it->serial() << std::endl;
        std::cout << "Test5 " << it->vendor() << ", " << it->description() << ", " << it->serial() << std::endl;
    }

    delete list;

    return EXIT_SUCCESS;
}

Program output:

Test1 Lattice, Lattice FTUSB Interface Cable
Test2 Lattice, Lattice FTUSB Interface Cable
Test3 Lattice, Lattice FTUSB Interface Cable,
Test4    $  $  $  $  C  s  , Cable,
Test5    $  $  $  $  C  s  , Cable,

Once it->serial() has been accessed, it->vendor() and it->description() have been corrupted.

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