Read Serial Comm input buffer

I got this sample code from MSDN, But I got no idea how to convert the read byte as below:

PHP Code:

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DWORD PortReadThread (LPVOID lpvoid)
{
    BYTE Byte;
    wchar_t InBuff[1];
    DWORD dwCommModemStatus, dwBytesTransferred;

    // Specify a set of events to be monitored for the port.
    SetCommMask (hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RLSD | EV_RING);

    while (hPort != INVALID_HANDLE_VALUE) 
    {
        // Wait for an event to occur for the port.
        WaitCommEvent (hPort, &dwCommModemStatus, 0);

        // Re-specify the set of events to be monitored for the port.
        SetCommMask (hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING);

        if (dwCommModemStatus & EV_RXCHAR) 
        {
            // Loop for waiting for the data.
            do 
            {
                // Read the data from the serial port.
                ReadFile (hPort, &Byte, 1, &dwBytesTransferred, 0);

                // Display the data read.
                if (dwBytesTransferred == 1)
                {
                    // How to convert the Byte to wchar_t buffer -> InBuff ??
                    // Help                
                }
            } while (dwBytesTransferred == 1);

        }
    }

    return 0;
} 


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