Re: Convert Byte [] to byte

<dhu.prasanna@gmail.com> ha scritto nel messaggio
news:5440539b-d59d-497d-afdb-31baeabe1f41@d27g2000prf.googlegroups.com...


If you want to convert an array of BYTEs, you may use a function like so:

<code>

// ---------------------------------------------------------------------
// Converts a vector of bytes into an hex string.
// ---------------------------------------------------------------------
CString ByteVectorToHexString( const std::vector< BYTE > & bytes )
{
    if ( bytes.empty() )
        return _T("");

    // Will contain the complete string
    CString result;

    // Temporary buffer to convert one byte to hex
    TCHAR buf[10];

    // For each byte in the array
    const int count = static_cast<int>( bytes.size() );
    for ( int i = 0; i < count; i++ )
    {
        // Print the hex byte to temporary string buffer
        int b = static_cast<int>( bytes[i] );
        StringCbPrintf( buf, sizeof(buf), _T("%02X"), b );

        // Concatenate this byte to the rest of string
        result += buf;
    }

    return result;
}

</code>

I store the byte array in a std::vector<BYTE>.

You can use the above function like so:

<code>

std::vector< BYTE > bytes(3);
bytes[0] = 0x2C;
bytes[1] = 0xF3;
bytes[2] = 0x12;

// Print
MessageBox(
  NULL,
  ByteVectorToHexString(bytes),
  _T("Test"),
  MB_OK );

</code>

You need to #include <vector> for the std::vector class, and <StrSafe.h> for
the StringCbPrintf function.


If you want to change the values of the bytes stored into the array, you may
use code like so:

 bytes[0] = 0x02;
 bytes[1] = 0x8D;
 bytes[2] = 0x37;
 ...

If you want to check array bounds, you can use at() instead of operator[]
(i.e. bytes.at(1) = ... ).
If you want to change vector size, you can use std::resize.

HTH,
Giovanni