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Vc++ 6.0

Posted on 1998-12-22
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Last Modified: 2010-04-02
I have created a generic class in a ActiveX control project , which owns some properties and member fuctions that have itself special datatype(example: CPerson) and return type(example: CPerson), how can I use it in VB? Now, I can add the controller into VB, but I can't use the member fuctions and properties that I defined myself like those  member fuctions and properties which automatically inherit from MFC.
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Question by:WangHong
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Tommy Hui earned 600 total points
ID: 1180877
You have to make sure that CPerson is derived from CObject. Then in the constructor of the class call EnableAutomation(). Finally, you need to use IDispatch* instead of CPerson* in your methods and properties. To retrieve the IDispatch* from a CPerson* you need to use

  IDispatch* dispatch = person->GetIDispatch(FALSE);

You cannot safely convert from an IDispatch* to a CPerson* unless there is a specific interface (CLSID) that you can query IDispatch* for and get a valid interface pointer. My suggestion is to either make a specific interface and add it to CPerson's interface map. Another possible solution to this problem is to use the IDispatch interface directly. That is GetIDsofNames() and Invoke().
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by:WangHong
ID: 1180878
Sir, I have try your propose in a project. However, I still can't use the class properties or methods I defined myself. For example, I defined two classes named CPoint and CPoints use MFC class wizard as follow:
  class CPoint : public CCmdTarget
  {
   public:
      ...
   public:
     X : double;
     Y : double;
     ...(methods and properties)
   };

  class CPoints : public CCmdTarget
  {
   public:
      ...
   public:
     CPoint Items(short Index);
     void Add(CPoint aPoint);
     ...(methods and properties)
   };
   
   class CMyActiveXCtl : public COleControl
   {
    ....
    };
   And I suppose that I will use these two ActiveX Automation objects in VB 6.0 as follow:
   dim pt as new Point
   dim pts as new Points
   pt.x = 100.1
   pt.y = 200.1
   pts.Add(pt)
   
   May you tell me how can I realize these? If possible, please give me the actual steps and detail source code of the example.Thanks a lot.

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