C++ COM ambiguity for "createinstance" from "ccomcoclass" and "stddispatchimpl"

Question

0.00/5 (No votes)

See more:

C#

Sorry somehow some text is missing in my previous question. Thanks for bearing with me. Here is complete question-

Working on VS2013.

I have created a classs-

class ATL_NO_VTABLE CMyClass : 
	public CComObjectRootEx <<CComMultiThreadModel>>,
	public CComCoClass<<CMyClass, CLSID_MyClass&>>,
	public IDispatchImpl<<IMyInterface3, IID_IMyInterface3, LIBID_myLib,  1, 0>>,  
        public StdDispatchImpl<<CMyClass>>;

In another cpp file I'm creating instance as follows-

CMyClass::CreateInstance(_pMyClass);

<b>Here I get error, saying:  
error C2385: ambiguous access of 'CreateInstance'
          could be the 'CreateInstance' in base 'ATL::CComCoClass<<CMyClass, CLSID_MyClass>>'
or could be the 'CreateInstance' in base 'StdDispatchImpl<<CMyClass&>>
		  
I need all the base class to derive from for my development purpose.
Kindly advice how to resolve the ambiguity.

If I exclude last line from my class (i.e. public StdDispatchImpl <<CMyClass>>), Compiler will be very happy to compile it successfully.

note: I need to use CreateInstance  from StdDispatchImpl<<CMyClass&>>


Thanks,
Praveen

What I have tried:

google..

I need all the base class to derive from for my development purpose.
Kindly advice how to resolve the ambiguity.
note: I need to use "CreateInstance" from 'StdDispatchImpl<<CMyClass>>'

Posted 25-Jul-16 21:02pm

Praveen0711

Updated 26-Jul-16 19:02pm

v6

Add a Solution

Comments

barneyman 27-Jul-16 1:06am

CMyClass::StdDispatchImpl<cmyclass>::CreateInstance ?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KarstenK · Answer 1 · 2016-07-25T21:23:00

Solution 1

Such problems often occur, when you change names after creating such classes. I only can guess, that the naming glue between CMyClass, CLSID_MyClass and IMyInterface3 is broken. Best is creating this files from the scratch again.

Include the error messages of the compiler!!!

Posted 25-Jul-16 21:23pm

KarstenK

Comments

Praveen0711 26-Jul-16 5:20am

Sorry somehow some text is missing in my previous question. Thanks for bearing with me. Here is complete question-

Working on VS2013.

I have created a classs-

class ATL_NO_VTABLE CMyClass :
public CComObjectRootEx <<CComMultiThreadModel>>,
public CComCoClass<<CMyClass, &CLSID_MyClass>>,
public IDispatchImpl<<IMyInterface3, &IID_IMyInterface3, &LIBID_myLib, 1, 0>>,
public StdDispatchImpl< CMyClass >

In another cpp file I'm creating instance as follows-

CMyClass::CreateInstance(&_pMyClass);

Here I get error, saying:
error C2385: ambiguous access of 'CreateInstance'
could be the 'CreateInstance' in base 'ATL::CComCoClass<<CMyClass,&CLSID_MyClass>>'
or could be the 'CreateInstance' in base 'StdDispatchImpl<<CMyClass>>'

I need all the base class to derive from for my development purpose.
Kindly advice how to resolve the ambiguity.

If I exclude last line from my class (i.e. public StdDispatchImpl< CMyClass >), Compiler will be very happy to compile it successfully.

note: I need to use "CreateInstance" from 'StdDispatchImpl<<CMyClass>>'

Thanks,
Praveen