long myProject::Convert2To10(CString strBuff)
{
   long num = 0, sum = 0;
   int nLen = strBuff.GetLength();
   for ( int i = 0; i < nLen; i++ )
   {
      num = ( strBuff.GetAt(i) - 48 );
      num = num * (long)pow( 2, nLen - i - 1 );  
      sum += num;
    }
   return sum;
}