Error Message From Hresult
Contents |
Tips/Tricks Top Articles Beginner Articles Technical Blogs Posting/Update Guidelines Article Help Forum Article Competition Submit an article or tip Post your Blog quick answersQ&A Ask a Question View Unanswered Questions View hresult error lookup All Questions... C# questions Linux questions ASP.NET questions SQL questions VB.NET questions hresult error message c++ discussionsforums All Message Boards... Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and hresult error codes Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / STL Managed C++/CLI C# Free Tools Objective-C and Swift Database Hardware & Devices> System Admin Hosting and Servers Java .NET c++ hresult to string Framework Android iOS Mobile SharePoint Silverlight / WPF Visual Basic Web Development Site Bugs / Suggestions Spam and Abuse Watch features Competitions News The Insider Newsletter The Daily Build Newsletter Newsletter archive Surveys Product Showcase Research Library CodeProject Stuff communitylounge Who's Who Most Valuable Professionals The Lounge  The Insider News The Weird & The Wonderful The Soapbox Press Releases Non-English Language > General Indian
Convert Hresult To Win32 Error
Topics General Chinese Topics help What is 'CodeProject'? General FAQ Ask a Question Bugs and Suggestions Article Help Forum Site Map Advertise with us About our Advertising Employment Opportunities About Us Ask a Question All Questions All Unanswered FAQ How to get an error code out of an HRESULT Rate this: Please Sign up or sign in to vote. See more: C++ This is what I have: CComQIPtr
Chen - MSFTNovember 3, 200632 0 0 0 Everybody knows that you can use the HRESULT_FROM_WIN32 macro to convert a Win32 error
_com_error
code to an HRESULT, but how do you do the reverse? hresult formatmessage Let's look at the definition of HRESULT_FROM_WIN32: #define HRESULT_FROM_WIN32(x) \ ((HRESULT)(x) <= 0 ? ((HRESULT)(x)) \ convert hresult to error message : ((HRESULT) (((x) & 0x0000FFFF) | (FACILITY_WIN32 << 16) | 0x80000000))) If the value is less than or equal to zero, then the macro returns the http://www.codeproject.com/Questions/152658/How-to-get-an-error-code-out-of-an-HRESULT value unchanged. Otherwise, it takes the lower sixteen bits and combines them with FACILITY_WIN32 and SEVERITY_ERROR. How do you reverse this process? How do you write the function WIN32_FROM_HRESULT? It's impossible to write that function since the mapping provided by the HRESULT_FROM_WIN32 function is not one-to-one. I leave as an execise to draw the https://blogs.msdn.microsoft.com/oldnewthing/20061103-07/?p=29133 set-to-set mapping diagram from DWORD to HRESULT. (Original diagram removed since people hate VML so much, and I can't use SVG since it requies XHTML.) If you do it correctly, you'll have a single line which maps 0to S_OK, and a series of blocks that map blocks of 65536 error codes into the same HRESULT space. Notice that the values in the range 1 through 0x7FFFFFFFF are impossible results from the HRESULT_FROM_WIN32 macro. Furthermore, values in the range 0x80070000 through 0x8007FFFF could have come from quite a few original Win32 codes; you can't pick just one. But let's try to write the reverse function anyway: BOOL WIN32_FROM_HRESULT(HRESULT hr, OUT DWORD *pdwWin32) { if ((hr & 0xFFFF0000) == MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIN32)) { // Could have come from many values, but we choose this one *pdwWin32 = HRESULT_CODE(hr); return TRUE; } if (hr == S_OK) { *pdwWin32 = HRESULT_CODE(hr); return TRUE; } // otherwise, we got an impossible value return FALS
and removed. (September 2016) (Learn how and when to remove this template message) In the field of computer programming, the HRESULT is a data type used https://en.wikipedia.org/wiki/HRESULT in Windows operating systems, and the earlier IBM/Microsoft OS/2 operating system, https://bytes.com/topic/c-sharp/answers/760782-how-can-i-get-description-hresult to represent error conditions, and warning conditions. 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. HRESULTs are error message numerical error codes. Various bits within an HRESULT encode information about the nature of the error code, and where it came from. HRESULT error codes are most commonly encountered in COM programming, where they form the basis for a standardized COM error handling convention. Contents 1 HRESULT format 1.1 Format details 2 How HRESULTs work 3 Using HRESULTs convert hresult to 4 Examples 5 References 6 External links HRESULT format[edit] An HRESULT value has 32 bits divided into three fields: a severity code, a facility code, and an error code. The severity code indicates whether the return value represents information, warning, or error. The facility code identifies the area of the system responsible for the error. The error code is a unique number that is assigned to represent the exception. Each exception is mapped to a distinct HRESULT. HRESULTs are organized as follows:[1] Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Field S R C N X Facility Code Format details[edit] S - Severity - indicates success/fail 0 - Success 1 - Failure R - Reserved portion of the facility code, corresponds to NT's second severity bit. 1 - Severe Failure C - Customer. This bit specifies if the value is customer-defined or Microsoft-defined. 0 - Microsoft
help? Post your question and get tips & solutions from a community of 418,536 IT Pros & Developers. It's quick & easy. How can I get the description for a HRESULT? P: n/a wundertier Hi, I'm accessing COM objects from C#.net. In case of error a COMException is thrown which includes the HRESULT. But how do I get the description for the HRESULT? The Message property of the COMException does not contain any useful information. Example (I've got a german OS only, so I don't know the exact english version of these texts): HRESULT is: 800706ba Message is: "Die COM-Klassenfactory für die Komponente mit CLSID {E36D3A64-1FCE-11D3-B2EF-00104B066E1A} konnte aufgrund des folgenden Fehlers nicht abgerufen werden: 800706ba." (The COM-factory for the component with CLSID {E36D3A64-1FCE-11D3-
B2EF-00104B066E1A} could not be called because of the following error: 800706ba.) What I would like to get is what tools like ERRLOOK return: "Der RPC-Server ist nicht verfügbar." (RPC server is not available.) Is there a way to access these error texts from C#? Thanks for help! Steffi Jan 18 '08 #1 Post Reply Share this Question 3 Replies P: n/a KWienhold On 18 Jan., 10:55, "wundert...@web.de"