WinRT component with IDL

Question

I add a IDL file to expose the runtime class. Like this:

import "Windows.Media.idl";

#include <sdkddkver.h>

namespace Mpeg2Decoder
{
	[version(NTDDI_WIN8)]
    runtimeclass Mpeg2Decoder
    {
		[default] interface Windows.Media.IMediaExtension;
    }
}

When i compile it, report:

1>  MIDLRT Processing .\Mpeg2Decoder.idl
1>  Mpeg2Decoder.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\Windows.Media.idl
1>  Windows.Media.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\inspectable.idl
1>  inspectable.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\shared\wtypes.idl
1>  wtypes.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\shared\wtypesbase.idl
1>  wtypesbase.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\shared\basetsd.h
1>  basetsd.h
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\shared\guiddef.h
1>  guiddef.h
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\um\unknwn.idl
1>  unknwn.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\hstring.idl
1>  hstring.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\AsyncInfo.idl
1>  AsyncInfo.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\EventToken.idl
1>  EventToken.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\Windows.Foundation.idl
1>  Windows.Foundation.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\winrt\IVectorChangedEventArgs.idl
1>  IVectorChangedEventArgs.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\um\oaidl.idl
1>  oaidl.idl
1>  MIDLRT Processing C:\Program Files\Windows Kits\8.0\Include\um\objidl.idl
1>  objidl.idl
1>midlrt : error MIDL4034: Failed to load a dependency file. Windows.winmd (HRESULT:0x80070002 - Can't find the specify file )

I don't know what's the dependency file

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haha

Answer 1

Hello,

Would you please provide us more information about this issue? Like what function do you want to achieve. Maybe we can another alternative way to do this in metro.

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 2

I compare the project files, and find the problem: It lack of MIDL setting. But i create the project by the wizard, i can't find how to add a MIDL for WinRT component. So i just copy it from a  sample project file to solve it.

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haha

Answer 3

Go To Property Pages->MIDL->General.

Locate "Additional Metadata Directories", and add "$(WindowsSDK_MetadataPath)".

Hit compile.

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