0x80000004 - JavaScript runtime error: No such interface supported

Question

In my C++ runtime component, it throws an exception with customzied hresult and a string.

    if (ER_OK != status) {
        throw Platform::Exception::CreateException(0x80000000 | (int)(status), "My Error message"));
    }

For the javascript app that uses the c++ runtime component, the exception is shown as "0x80000004 - JavaScript runtime error: No such interface supported". This is very misleading to developers.

=========================The Visual Studio Debugger Output=================================

Unhandled exception at line 291, column 13 in ms-appx://a9486bc2-5b1b-4c01-ba95-c7bf7ac2739a/js/alljoyn.js

0x80000004 - JavaScript runtime error: No such interface supported

WinRT information: No such interface supported

Answer 1

Hi Renjie,

You cannot trap custom exceptions in JavaScript.  Instead provide a mechanism to get a custom string back if there was an error.

-Jeff

---

Jeff Sanders (MSFT)

Answer 2

Hi Jeff,

I understand that I cannot trap custom exceptions in JavaScript. But I don't understand why the exception is mapped to 0x80000004(No such interface supported). On C#, it shows as "System.Exception".

Answer 3

OK. That is because my error code is status = 4, so 0x80000000 | (int)(status) = 0x80000004

In Winerror.h

//
// MessageId: E_NOINTERFACE
//
// MessageText:
//
// No such interface supported
//
#define E_NOINTERFACE                    _HRESULT_TYPEDEF_(0x80000004L)

Is there any way to make my hresult is really unique so that it will not be recognized as a system defined error code.

Answer 4

After I set the C bit of the HResult, it seems OK now.

    if (ER_OK != status) {
        throw Platform::Exception::CreateException(0xC0000000 | (int)(status), "My Error message"));
    }

http://en.wikipedia.org/wiki/HRESULT