error MIDL2003: redefinition : IMyInterface

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Hi,
I am modifying the MFC project odl file for adding new interface ILayer but it is already exists in other project so when I build all the projects I am getting the redefinition related error. as below:

f:\clearcase\compomap_source\compomap_cvob\source\vs2010\comworkspace\workspacetest\stdafx.h(68): warning C4278: 'min': identifier in type library '..\..\Debug\ComMapServer.exe' is already a macro; use the 'rename' qualifier
4>f:\clearcase\compomap_source\compomap_cvob\source\vs2010\comworkspace\workspacetest\stdafx.h(68): warning C4278: 'max': identifier in type library '..\..\Debug\ComMapServer.exe' is already a macro; use the 'rename' qualifier
5>  Processing C:\Program Files\Microsoft SDKs\Windows\v7.0A\include\msxml.idl
5>  msxml.idl
5>  Processing ..\ComWorkspace\ComWorkspace.idl
5>  ComWorkspace.idl
5>  Processing ..\ComMapWorks\ComMapServer\ComMapServer.idl
5>  ComMapServer.idl
5>.\CompoMap.odl(1329): error MIDL2003: redefinition : ILayer
5>.\CompoMap.odl(1521): error MIDL2003: redefinition : IItem
5>.\CompoMap.odl(2328): warning MIDL2214: semantic check incomplete due to previous errors
6>------ Build started: Project: compotest, Configuration: Debug Win32 ------

Posted 22-Dec-10 19:41pm

jamshed11

Updated 24-Dec-10 0:22am

Tony Richards

v3

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Tony Richards 24-Dec-10 6:23am

Fixed HTML encoding of angle brackets and apostrophe.

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fjdiewornncalwe · Answer 1 · 2010-12-24T06:14:00

Solution 1

You have pretty much answered your own question. Why are you redifining ILayer if it already exists elsewhere. Either define it under a unique name, or use the existing one.

Posted 24-Dec-10 6:14am

fjdiewornncalwe

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jamshed11 26-Dec-10 22:59pm

Thanks a lot for your reply. I am a new bee, here my requirement is to define new interface ILayer in project B with same name but different uuid and IID, also the member functions would be different hence I want to redefine the new interface with same name but different uuid and IID, but not able fix it till now. I am getting the same redefination error. I read somewhere in forum about using namespaces to access interfaces with same name. but in IDL file I dont know how to import or use namespace if one want to use namespace in .IDL file. It would be great if you know how to use namspace in .IDL file.
There is same question posted on code project with title "Duplicate Interface Names Across different components" please see that question too for more clearity about my question.

Thanks in Advance
Dnyanesh