Knowledge Base Nr: 00161 siemensconv.cpp - http://www.swe-kaiser.de

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siemens datentypen nach intel konvertieren

  
float fData;
unsigned int nData;
...
case 'B': //BOOL
case 'C': //BYTE
    nData = m_dbitem[nDBindex].m_dbdata[nDW];
    if (nData&0x80) //negativ!
    {
      nData = - (128 - (nData&0x7f));
    }
    break;
case 'W': //WORD
    nData = m_dbitem[nDBindex].m_dbdata[nDW];
    nData = (nData<<8) & 0xff00;
    nData |= m_dbitem[nDBindex].m_dbdata[nDW+1];
    if (nData&0x8000) //negativ!
    {
      nData = - (32768 - (nData&0x7fff));
    }
    break;
case 'D': //DWORD
    nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+3]<<0) & 0x000000FF);
    nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+2]<<8) & 0x0000FF00);
    nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+1]<<16) & 0x00FF0000);
    nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+0]<<24) & 0xFF000000);
    if (nData&0x80000000) //negativ!
    {
      nData = - (2147483648 - (nData&0x7fffffff));
    }
    break;
case 'R': //REAL
    *nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+3]<<0) & 0x000000FF);
    *nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+2]<<8) & 0x0000FF00);
    *nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+1]<<16) & 0x00FF0000);
    *nData |= (((int)m_dbitem[nDBindex].m_dbdata[nDW+0]<<24) & 0xFF000000);
    memcpy(fData, nData, 4);
    break;
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