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9.6

VB accessing MFC VC++ OLE server

Asked by aerol in Windows MFC Programming, Microsoft Programming

Tags: vts_pr8, disp_function

Hi All,

I hope I ask this question clearly. It is a difficult one. I have taken over some code so I don't understand everything. In VC++ (MFC) I have an OLE server running that accesses data in a CAD system. This is all OK. I then have a VB program that loads this "broker" and access the data. Everything is fine except now I want to pass an array of DOUBLES from the broker to VB. Up until now it has been string data, integers, and doubles, but not double arrays. Here is a few lines form the broker (VC++) side:

   DISP_FUNCTION(CBroker, "GetProperties", GetProperties, VT_EMPTY, VTS_PR8 VTS_PI4)    

   afx_msg void GetProperties(double FAR* dPropValue, long FAR* errorCode);

   void CBroker::GetProperties(double FAR* dPropValue, long FAR* errorCode)

So, in the above, the dPropValue is a double value that I would like to make a double array.

In the VB code I have (all the CreateObject stuff works fine):

   Dim dPropValue(100) As Double

   Broker.GetProperties dPropValue, errCodeLocal

I get a runtime error about "Type mismatch".

The bottom line is I don't know how to make this process work with arrays. With the single double values being passed (VTS_PR8), it works fine. This is a pointer to a double. I was thinking (hoping?) that an array would be handled similarily since an array name is really a pointer in C. I'm lost at this point. Can anybody suggest a solution???

Thanks!

Dave P
[+][-]08/13/02 08:44 AM, ID: 7217539Expert Comment

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[+][-]08/13/02 12:22 PM, ID: 7218127Author Comment

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[+][-]08/14/02 12:05 AM, ID: 7219082Accepted Solution

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About this solution

Zones: Windows MFC Programming, Microsoft Programming
Tags: vts_pr8, disp_function
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Solution Provided By: migel
Participating Experts: 1
Solution Grade: A
 
 
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