C / C++ / MFC

void MyTrim( LPTSTR lpszString )
{
    LPCTSTR lpsz = lpszString;
 
    while ('0' == *lpsz)
        lpsz = _tcsinc(lpsz);
 
    if (lpsz != lpszString)
    {
        // now we are pointing to the first non-zero character
        
        int nLength = _tcslen(lpszString) - (lpsz - lpszString);
        memmove(lpszString, lpsz, (nLength + 1) * sizeof(TCHAR));
        // you may need to insert a \0 character here
    }
}

CPaintDC dc(this);
CRect cRect; GetClientRect( cRect );
int nWidth = cRect.Width();
int nHeight = cRect.Height();
CBitmap cBitmap;

cBitmap.LoadBitmap( IDB_BITMAP1 );

DWORD* pBuffer = new DWORD[ nWidth * nHeight ];


DWORD dwSize = cBitmap.GetBitmapBits( nWidth * nHeight,
                                    pBuffer );
for ( int y = 0 ; y < nHeight ; y++ )
{
    for ( int x = 0; x < nWidth ; x++ )
    {
        if ( *(pBuffer+x+nWidth*y) < RGB( 64, 128 , 256 ) )
        {
            *(pBuffer+x+nWidth*y) = 0; //black
        }
        else
        {
            *(pBuffer+x+nWidth*y) = 0x00FFFFFF; //white
        }
    }
}

cBitmap.SetBitmapBits( nWidth * nHeight ,
                       pBuffer );

CDC cMemDC;
cMemDC.CreateCompatibleDC( &dc );

cMemDC.SelectObject( &cBitmap );

dc.BitBlt( 0,
           0,
           nWidth,
           nHeight,
           &cMemDC,
           0,
           0,
           SRCCOPY );


delete [] pBuffer;

for ( int x = 0 ; x < dwSize ; x++ )
{
     if ( pBuffer[x] < RGB( 64, 128 , 256 ) )
     {
         pBuffer[x] = 0; //black
     }
     else
     {
         pBuffer[x] = 0x00FFFFFF; //white
     }
 }

byte  grey = (byte)(
	(R * 0.299) +
	(G * 0.587) +
	(B * 0.114)
);