How to get an error code out of an HRESULT

Question

0.00/5 (No votes)

See more:

This is what I have:

CComQIPtr<ICSFTHST>	spHst;

HRESULT hr1  = CoCreateInstance(
    CClsid::m_CSFTHST, NULL, CLSCTX_LOCAL_SERVER, IID_ICSFTHST, 
    (void **)&spHst);

Sometimes hr1 is success and sometimes it's failure!

I have been trying all ways to get the error code out of hr1, it's been days now, and I am so frustated.

How do I get the error code out of hr1? Please help!

Posted 1-Feb-11 4:42am

amarasat

Updated 1-Feb-11 4:59am

Nish Nishant

v2

Add a Solution

3 solutions

Solution 3

Already ried this one, but not much luck!!

*pdwWin32 = HRESULT_CODE(hr);

Tried everything, finally this is helping a lot!!

CString sErrorMsg = _com_error(hr1).ErrorMessage();

But i wonder the above statement is always returning "Operation completed sucessfully"

May be -com-error is different from what Andrew said, because according to the link andrew gave

Or you can just check the return value with the MSDN docs for CoCreateInstance[^]

S_OK shows a different description.

Posted 1-Feb-11 8:19am

amarasat

Comments

amarasat 1-Feb-11 14:38pm

Thanks a lot everyone, i have a question now!!

CComQIPtr<icsfthst> spHst;

HRESULT hr1 = CoCreateInstance(
CClsid::m_CSFTHST, NULL, CLSCTX_LOCAL_SERVER, IID_ICSFTHST,
(void **)&spHst);

Since the hr1 value is S_OK, Is there anyway i can check to see if the pointer &spHst is still valid:
like it is pointing to a valid location or not?

or can i put the value of the pointer into a CString and output it to a file:

spHst.p is the value, i have to check if this points to a valid location if not or so make a log of this value in a trace file.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Nish Nishant · Accepted Answer · 2011-02-01T04:55:00

Solution 1

Raymond Chen has blogged about this:

See http://blogs.msdn.com/b/oldnewthing/archive/2006/11/03/942851.aspx[^]

Posted 1-Feb-11 4:55am

Nish Nishant

Comments

Henry Minute 1-Feb-11 11:08am

Excellent link. + 5

Espen Harlinn 1-Feb-11 11:33am

Well, that's a good link :)

Nish Nishant 1-Feb-11 11:35am

Thank you, Espen and Henry.

Sergey Alexandrovich Kryukov 1-Feb-11 12:36pm

Good, relevant, a 5.
--SA

Andrew Brock · Accepted Answer · 2011-02-01T05:02:00

Solution 2

Read the article on MSDN[^] about HRESULT.

You may be able to use FormatMessage[^] to get error text (see the remarks section).

Or you can just check the return value with the MSDN docs for CoCreateInstance[^]

Posted 1-Feb-11 5:02am

Andrew Brock

Comments

Espen Harlinn 1-Feb-11 11:39am

Good 5+

Sergey Alexandrovich Kryukov 1-Feb-11 12:36pm

Correct, my 5.
--SA