RE: Need some assistance with a function

From:
=?Utf-8?B?QXJtYW4gU2FoYWt5YW4=?= <armancho_x@rambler.ru(donotspam)>
Newsgroups:
microsoft.public.vc.mfc
Date:
Sun, 3 Jun 2007 22:43:00 -0700
Message-ID:
<C1E90D75-9EF9-4A0C-83BE-0C437463F6A8@microsoft.com>
Hi,

"Stick" wrote:

Hi,

First, I'm programming a WIN32 app which is an add-on. I do need to include
windows.h, and it would seem this prevents me from using any MFC stuff.


This is not the case. Windows.h doesn't [and cannot] "prevent" from using
MFC. Rather it is already included by MFC headers. So it is already there in
an MFC project.

Is the CByteArray class an MFC thing?


Yes.

Can I do something like this:

    CByteArray mac;
    mac.SetSize(MAC_DIM);

    for( int i = 0; i < MAC_DIM; i++ )
    {
        macAddress[i] = guid.Data4[i+2];
    }

meaning access the elements with array syntax?


Yes. operator [] has two overloads; one of them returns a non-const
reference of an element to allow it to be used as l-value.

Finally, I'm completely lost on how to write a functinon

    void MyClass::Buffer2HexString( CByteArray& , string& );

which, will return the array of bytes as a hex string, meaning convert the
byte array to a string of hex digits that can be printed easily.


Use std::stringstream or _ttot or smth else. A typical code might look like
so;

CString ByteArrayToHexes(const CByteArray &array)
{
    CString res;
    for (int j = 0; j < array.GetSize(); j ++)
    {
        BYTE val = array[j];
        TCHAR buf[4];
        _itot(val, buf, 16);
        res += CString(buf);
    }
    return res;
}

Might even be better to just return a string object, but what is really just
driving me crazy is the proper "UNICODE" aware way to do the above for a
small array of 6 bytes.


If _UNICODE is defined, _itot works with unicode symbols.

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