Common Hresult Error Codes
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Hresult 80004003
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Hresult S_false
Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping hresult 0x80131500 each other. Join them; it only takes a minute: Sign up What values to return for S_OK or E_FAIL from c# .net code? up vote 10 down vote favorite 3 I'm implementing a COM interface that should return https://msdn.microsoft.com/en-us/library/windows/desktop/aa378137(v=vs.85).aspx int values either S_OK or E_FAIL. I'm ok returning S_OK as I get that back from another call (Marshal.QueryInterface), but if I want to return a failure value what actual value do I use for E_FAIL? (It's such a basic fundamental question that it's hard to find an answer to) Assuming it's a specific number defined in the Win32 API, is there way to use it within .net code without declaring my own constant? thanks! Update http://stackoverflow.com/questions/362861/what-values-to-return-for-s-ok-or-e-fail-from-c-sharp-net-code (answered below): Maybe I'm being a complete plonker, but I'm having problems with this. According to my Platform SDK, HRESULT is a LONG, which is a 32-bit signed integer, right? So possible values –2,147,483,648 to 2,147,483,647. But 0x80004005 = 2,147,500,037 which is > 2,147,483,647. What gives!? This means when I try to put this in my code: const int E_FAIL = 0x80004005; I get a compiler error Cannot implicitly convert type 'uint' to 'int'. Update 2: I'm going to declare it like this: const int E_FAIL = -2147467259; because if I try to do something like this: const UInt32 E_FAIL = 0x80004005; return (Int32)E_FAIL; I get a compiler error Constant value '2147500037' cannot be converted to a 'int' (use 'unchecked' syntax to override) Phew! Who knew how tricky it would be to declare a standard return value.... Somewhere there must be a class lurking that I should have used like return Win32ReturnCodes.E_FAIL; ... sigh ULTIMATE SOLUTION: I now do this by getting the (massive but very useful) HRESULT enum from pinvoke.net and adding it to my solution. Then use it something like this: return HRESULT.S_OK; c# .net com return-value share|improve this question edited Feb 2 '10 at 15:04 asked Dec 12 '08 at 14:12 Rory 19.7k32116177 add a comment| 6 Answers 6 active oldest votes up vote 7 down vote accepted E_FAIL is Hex 80004005 in WinError.h Yo
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with http://stackoverflow.com/questions/12852626/why-is-hresult-0-for-success us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why is HRESULT 0 for success? up vote 4 down vote favorite I just ran into something very awkward while working with HRESULT return values, it seems that success is 0 and failure is 1. What is the logic behind this? I error codes actually tried if(!hr) and failed miserably, wasting an hour of my life until I figured out the actual success retval is 0. I would like to call the person who thought of this an idiot, but I'll try to cool down - hoping someone will shed some light on this convention. c++ windows share|improve this question asked Oct 12 '12 at 5:11 Fractal Resurgence 122212 2 This is a very common convention, not just limited to Microsoft - typically there is only one common hresult error way to succeed and multiple ways to fail, so 0 = SUCCESS, and values other than 0 are used to indicate the cause of failure. –Paul R Oct 12 '12 at 5:15 The rule of thumb is "When you see a non-bool error code, check the range and meaning of its possible values". –Steed Oct 12 '12 at 6:21 add a comment| 3 Answers 3 active oldest votes up vote 9 down vote accepted The original purpose of HRESULTs was to formally lay out ranges of error codes for both public and Microsoft internal use in order to prevent collisions between error codes in different subsystems of the OS/2 Operating System. That's why, value of 0 (of highest bit of HRESULT) means 'no error', that is, success. But one should be careful, since it is possible for HRESULT to have highest bit set to 0 and other bits set different from 0. That means, the check if(0 == hr) { ... } may not work for some successful cases. The correct way to check for success is if(0 <= hr) { ... }. Wikipedia has more detailed information. SUCCEEDED and FAILED macros can be used to avoid mistakes when dealing with HRESULT values. if(0 <= hr) { ... } and if(SUCCEEDED(hr)) { ... } are basically the same things. share|improve this answer edited Oct 12 '12 at 6:20 answered Oct 12 '12 at 5:15 bhovhannes 2,3671132 Ah, there is merit to that. Since one uses
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