Well, here is this constructor:
Qt Code: 
  1. class CMerchandizeOrder
  2. {
  3. public:
  4.     CMerchandizeOrder();
  5.     CMerchandizeOrder(structOrder& order);
  6. ....
  7. };
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and here is implemetantion:
Qt Code: 
  1. CMerchandizeOrder::CMerchandizeOrder()
  2. {
  3.     m_OrderValues.iMerchandizeID=0;
  4.     m_OrderValues.iMerchandizeQuantity=0;
  5.     m_OrderValues.rMerchandizePrice=0.00;
  6.     m_OrderValues.rSubtotal=0.00;
  7.     //m_OrderValues.strDisplayString=QString("Test Artikel Blank Constructor");
  8.     m_OrderValues.strMerchandizeName=QString("Test Artikel");
  9.     setDisplayString(m_OrderValues.iMerchandizeID,
  10.                      m_OrderValues.strMerchandizeName,
  11.                      m_OrderValues.iMerchandizeQuantity,
  12.                      m_OrderValues.rMerchandizePrice,
  13.                      m_OrderValues.rSubtotal);
  14. }
  15.  
  16. CMerchandizeOrder::CMerchandizeOrder(structOrder& order)
  17. {
  18.     m_OrderValues.iMerchandizeID=order.iMerchandizeID;
  19.     m_OrderValues.iMerchandizeQuantity=order.iMerchandizeQuantity;
  20.     m_OrderValues.rMerchandizePrice=order.rMerchandizePrice;
  21.     m_OrderValues.rSubtotal=order.rSubtotal;
  22.     m_OrderValues.strMerchandizeName=order.strMerchandizeName;
  23.     setDisplayString(m_OrderValues.iMerchandizeID,
  24.                      m_OrderValues.strMerchandizeName,
  25.                      m_OrderValues.iMerchandizeQuantity,
  26.                      m_OrderValues.rMerchandizePrice,
  27.                      m_OrderValues.rSubtotal);
  28. }
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Will try with init function.