How do MSFT WinRT components raise Exceptions with explanation text?

Question

Like: 

xception was thrown at line 401, column 7 in ms-appx://app/js/sync/serverCommunication.js

0x80070490 - JavaScript runtime error: Element not found.

WinRT information: Cannot find credential in Vault

If there is a handler for this exception, the program may be safely continued.

I am interested in raising this WinRT information myself, as the default COM error values not always fit the error I want to specify.

Answer 1

Hi Phil,

They do not provide customer messages in the exception.  That information is available only in the debugger.

http://social.msdn.microsoft.com/Forums/en-US/winappswithnativecode/thread/a8d4b1c1-3cff-48ff-ad40-ab22b7c7487c

-Jeff

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Jeff Sanders (MSFT)

Answer 2

This seems to work in Win8.1 finally!

throw ref new Platform::Exception("My text") will lead to a JS Exception object that has that text after 2 newlines in the "message" property.

Thanks for listening MSFT!