How to map custom exception type to an HRESULT?

[JaiganeshKumaran]

I have a few custom exception types that need to reported with a custom HRESULT from a Windows Runtime component. I notice that there is winrt_to_hresult_handler but that won't really work in my case; I only need to handle a few exception types and then leave the reset to be handled by C++/WinRT, however, overriding the handler implies that you have to handle all exception types. Also another library (example: WIL) may have already overridden the handler, so me overriding it will prevent those exceptions being reported correctly, unless I take care to dispatch into them.

[JaiganeshKumaran]

Another idea I have is to make these custom exceptions inherit from a C++/WinRT exception type. For example, I have a custom not_implements class, which could inherit from hresult_not_implements on Windows. Though there is a downside of having to construct an hstring immediately.

[JaiganeshKumaran]

Here's another idea - provide a custom base class with a virtual function to convert the exception to an hresult_error.

struct convertible_to_hresult_error
{
    virtual winrt::hresult_error get_hresult_error();
}:

[kennykerr]

Exception types are not extensible in C++/WinRT.

[JaiganeshKumaran]

Exception types are not extensible in C++/WinRT.

But I do want to have my own exception types whose information can be transferred across components with a custom HRESULT. I do not want to it to be reported as E_FAIL.

[kennykerr]

You could serialize your exception type and transport it via ILanguageExceptionErrorInfo2 after creating a winrt::hresult_error. You can query for this interface using try_as.

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