Re: HRESULT return value in Javascript without exception

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Try describing your interface method in IDL like this:

HRESULT Testfunc1([out, retval] long *pResult);

and in C++ :

STDMETHODIMP Cwork::Testfunc1(long *pResult)
{
*pResult = 111;
return S_OK;
}


--
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin


"Rob" <Rob@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:5FF4D402-603F-46B3-8025-1D9A48D069B3@xxxxxxxxxxxxxxxx
Tried that, but the project (ATL activex) doesn't compile such a member.
It says that all interface members must return HRESULT.

Error, returnvalue, whatever.... ( is S_OK an error? )
What matters to me is that Javascript seems unable to typecast the 4 byte
piece of memory (HRESULT==LONG in C++) that is returned to something
usefull.

Greetings,
Rob.


"bruce barker" wrote:

HResult is meant to return errors, and is not the return value of a
interface. change the com interface to return an int value, then
javascript can access it.

-- bruce (sqlwork.com)

Rob wrote:
Hi,
If I call my own DLL from Javascript, a HRESULT is returned.
Javascript cannot cast this to an integer.
Is there any other way of typecasting this returnvalue to integer,
wihout
using the exception method which is described everywhere ?
Please note that I am unfamiliar with javascript, I am used to C/C++.

My Javascript call looks like :

var result;
result = Testfunc1();

The function is called OK, but the returnvalue cannot be converted.
It is printed as "undefined".
I just need 0 or 1 to be returned (or 2 other values, one for OK, and
one
for ERROR)
So I tried the following :

result = (Testfunc1() & 255) ;

But this always returns 0 for some reason....

It seems unlogical and not neat, to throw exceptions when really
nothing
serious happenned, just to convert the returnvalue. Also the
clientcode will
be poluted with a lot of extra (rather poorly structured) lines.
So If I could just get the low-byte of the HRESULT, this would be
enough for
me.

Please Help !

Greetings,
Rob.
























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