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Type Library Converter tool (TlbImp.exe) version 4.0.30319.1 changes any "false" Default Boolean arguments to "true"

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The Type Library Converter tool (TlbImp.exe) version 4.0.30319.1 changes any "false" default arguments to "true". Please see the details below for an understanding.
I created an ATL project named COMInteropTest and added an interface named IMyCOMServer. I added two methods namely: MyCOMServerMethodA() and MyCOMServerMethodB() with default arguments.

 

// COMInteropTest.idl : IDL source for COMInteropTest//// This file will be processed by the MIDL tool to// produce the type library (COMInteropTest.tlb) and marshalling code.

import "oaidl.idl";import "ocidl.idl";

[    object,    uuid(B139EA01-6552-43CF-B52F-50642D9D45AB),    dual,    nonextensible,    pointer_default(unique)]

interface IMyCOMServer : IDispatch{[id(1)] HRESULT MyCOMServerMethodA([in, defaultvalue(1)] VARIANT_BOOL bTestA);[id(2)] HRESULT MyCOMServerMethodB([in, defaultvalue(0)] VARIANT_BOOL bTestB);};

[    uuid(02A71855-FB48-419A-895B-63DF2E325706),    version(1.0),]library COMInteropTestLib{    importlib("stdole2.tlb");    [        uuid(CC9B6244-FB56-4CCA-B9FA-B71B5ECBC2C6)    ]    coclass MyCOMServer    {        [default] interface IMyCOMServer;    };};

  

Used Type Library Converter tool from VS 2008 to create the Interop shown below:

 

Here is what I see under .Net reflector. The default arguments are not changed.

 

Used Type Library Converter tool from VS 2010 to create the Interop shown below:

 

Here is what I see under .Net reflector. The default value of “false” is converted to “true”.

This is a code defect with TlbImp.exe version 4.0.30319.1 which has been fixed on the next version of Visual Studio. A possible workaround is to use TlbImp.exe from the Win8 developer preview build where this is fixed.

I installed Visual Studio 2011 Developers preview from www.microsoft.com/download/en/details.aspx?displaylang=en&id=27543 and extracted TLBIMP.exe from \Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools. The version of TLBIMP.exe is 4.030319.17020. I checked to see that it is handling the default Boolean arguments correctly.

Written By
Shamik Misra
Support Escalation Engineer, Microsoft Developer Support