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How to use ATL COM object created in VC++ in another ATL COM object in VC++

Posted on 2003-11-12
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Last Modified: 2013-12-14
I have ATL COM created in MS  Visual C++ 6.0, now I would like to use that in the different ATL COM object. How do I do it? Are there any changes to existing ATL Object in order to make it usable in a new ATL object? What do I have to do to get functionality of first ATL object in the second ATL object. I have a source code for first object and .dll and .lib files.

More details please.
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Question by:germaks
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by:Dexstar
ID: 9735938
germaks:

> I have ATL COM created in MS  Visual C++ 6.0, now I would like to use that in
> the different ATL COM object. How do I do it? Are there any changes to existing
> ATL Object in order to make it usable in a new ATL object? What do I have to
> do to get functionality of first ATL object in the second ATL object. I have
> a source code for first object and .dll and .lib files.

I would do it like this.  In a header file for your new ATL object, add this:

     #import "<PATH>\ObjectOne.dll" no_namespaces

(Where <PATH> and ObjectOne point to your original DLL file).

Then, here is some sample code of using your object (called YourObject, in this example).  Be sure to wrap your code in try/catch blocks to catch _com_error& e's.

     try
     {
          IYourObjectPtr spObject;

          spObject.CreateObject( __uuidof(YourObject) );
          spObject->SomeMethod();
     }
     catch ( _com_error& e )
     {
          // Handle the error
     }


Hope that helps,
Dex*
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Author Comment

by:germaks
ID: 9736532
It almost works,
when I compile it I get the error that CreateObject is not a member of '_com_ptr_t<class _com_IIID<struct IVerify,&struct __s_GUID _GUID_bc555c18_f885_4b65_aebf_683ba81cc964> >'

here is the code

IVerifyPtr LicV;
LicV.CreateObject( __uuidof(Verify) );
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Dexstar earned 500 total points
ID: 9741275
germaks:

Oops.  My mistake.  This line should be this:
     LicV.CreateInstance( __uuidof(Verify) );

(It's a hazard of going back and forth between VB and C++ all day...)

Dex*
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