Provide examples of using WindowsError and SystemError in the docs

[vitaut]

Provide 2-3 examples of real Windows error codes in the example so its usage makes sense and mention what happens if you enter a code that is not an official error code.

[patlecat]

Okay as discussed, here my example code that will let the user run through the Windows error codes by using the C++11 random generators - because rand() must not be used anymore!
Here's the list btw: http://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx

   #include <chrono>
   #include <random>

   unsigned long ulError = GetLastError(); // Get the error in this way

   // Setup the random number generator
    unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
    std::default_random_engine generator(seed);
    std::uniform_int_distribution<unsigned short> distribution (0, 15999); // Range of the Windows Error Codes
    unsigned short rand_error = distribution (generator);

    fmt::WindowsError gimmError (rand_error, " TestError: ");
    cerr << "\n***ERROR (" << rand_error << ")" << gimmError.what();

Output if you enter a number that is not a Windows error code: ***ERROR (6449) TestError: error code = 6449

[vitaut]

Thanks!

[vitaut]

Added examples, but still need to clarify what happens if you pass an invalid error code.

[vitaut]

Fixed in 326ade7.

[vitaut]

Took me only 7 months to close this =)

[patlecat]

Cool 👍