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VB Migration

Posted on 2000-05-04
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Last Modified: 2010-04-02
The problem: Using an ActiveX dll

In VB, in the references dialog y can select any registered dll such as 'Olemsg.dll'.
Then in any piece of code i can instantiate objects exposed in the library using a simple and cheap Dim statement e.g.:
Dim obj As MAPI.Recipient
'or
Set obj = CreateObject("MAPI.Recipient")


How do I do the same in C++? I'm using VC++ 6.0

Thanks
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Question by:trillo
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2 Comments
 
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Expert Comment

by:vbk_bgm
ID: 2779921
You need to derive a class from the type library (View -> ClassWizard and Add new class from the type lib). Select the classes that you need for your app.
Then you could create object using CreateDispatch and delete using ReleaseDispatch
For instance, if you are creating for Excel Automation.
m_Excel.CreateDispatch(Excel.Application);
where mExcel is of type Application in this case.
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Accepted Solution

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MUpchu777 earned 100 total points
ID: 2794932
If your talking about COM Objects (which is what I see in your example), the easiest solution is to use the #import statement.  The syntax is #import "<name of dll or tlb file here>".  There are a few other parameters, but that is the basic gist.  VC will wrap the COM object with smart pointer classes that handle referencing and dereferencing for you.  THis is a highly recommended way to work with COM Objects in VC.
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