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community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to get the error message from the error code returned by GetLastError()? up vote 65 down vote favorite 17 After a Windows API call, how can I get the last error message getlasterror c# in a textual form? GetLastError() returns an integer value, not a text message. Thanks. c++ c winapi share|improve this question edited Jan 21 '15 at 19:24 Mr.C64 19.1k64180 asked Sep 7 '09 at 0:05 Jena there use to be an exe error lookup in the tool section in visual studio which do this pretty well when you only need message from error for debugging. –ColdCat Jan 11 '14 at 1:55 add a comment| 9 Answers 9 active oldest votes up vote 61 down vote //Returns the last Win32 error, in string format. Returns an empty string if there is no error. std::string GetLastErrorAsString() { //Get the error message, if any. DWORD errorMessageID = ::GetLastError(); if(errorMessageID == 0) return std::string(); //No error message has been recorded LPSTR messageBuffer = nullptr; size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorMessageID, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL); std::string message(messageBuffer, size); //Free the buffer. LocalFree(messageBuffer); return message; } share|improve
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the past few weeks, and occasionally I’ve formatmessagew needed to set up some debug points to print errors that c# getlasterror message occur during file and memory I/O. When something goes wrong inside the Win32 API, some methods will http://stackoverflow.com/questions/1387064/how-to-get-the-error-message-from-the-error-code-returned-by-getlasterror return a system error code directly (such as all of the registry methods) and others will simple return a NULL pointer or a 0-length DWORD and require you to poll the GetLastError method yourself. Unfortunately, these http://www.aaronstannard.com/win32-errors-how-to-format-getlasterror()-output-into-readable-strings/ error codes are just long integers (DWORDs) and don’t contain any of that human-friendly information that I’m used to for .NET exceptions. I created a Gist on Github that shows how we do it and have also included the code below: Discussion, links, and tweets I'm the CTO and co-founder of Petabridge, where I'm making distributed programming for .NET developers easy by working on Akka.NET and Helios. Tweet Follow @Aaronontheweb P.S. Get the latest from Aaronontheweb Have my most recent essays and articles delivered directly to your mailbox. Please enable JavaScript to view the comments powered by Disqus. Copyright 2010 - 2015 Aaron Stannard
Articles Technical Blogs Posting/Update Guidelines Article Help Forum Article Competition Submit an article or tip Post your Blog quick http://www.codeproject.com/Tips/479880/GetLastError-as-std-string answersQ&A Ask a Question View Unanswered Questions View All Questions... C# https://www.sqlite.org/c3ref/errcode.html questions Linux questions ASP.NET questions SQL questions VB.NET questions discussionsforums All Message Boards... Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / error message STL Managed C++/CLI C# Free Tools Objective-C and Swift Database Hardware & Devices> System Admin Hosting and Servers Java .NET 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 get error message 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 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 Articles » Platforms, Frameworks & Libraries » Win32/64 SDK & OS » General Tip/TrickBrowse CodeStatsRevisions (2)Alternatives Comments Add your ownalternative version Tagged as VC7VC7.1VC8.0VC6WinXPWin2003Win2KWin-SDKWin32Dev Stats 20.1K views4 bookmarked Posted 18 Oct 2012 GetLastError as std::string Orjan Westin, 19 Oct 2012 BSD 4.75 (4 votes) 1 2 3 4 5 4.75/5 - 4 votesμ 4.75, σa 0.76 [?] Rate this: Please Sign up or sign in to vote. Simple function to get the text message corresponding to a system error. This function retrieves the last error code, if any, and g
int sqlite3_extended_errcode(sqlite3 *db); const char *sqlite3_errmsg(sqlite3*); const void *sqlite3_errmsg16(sqlite3*); const char *sqlite3_errstr(int); If the most recent sqlite3_* API call associated with database connection D failed, then the sqlite3_errcode(D) interface returns the numeric result code or extended result code for that API call. If the most recent API call was successful, then the return value from sqlite3_errcode() is undefined. The sqlite3_extended_errcode() interface is the same except that it always returns the extended result code even when extended result codes are disabled. The sqlite3_errmsg() and sqlite3_errmsg16() return English-language text that describes the error, as either UTF-8 or UTF-16 respectively. Memory to hold the error message string is managed internally. The application does not need to worry about freeing the result. However, the error string might be overwritten or deallocated by subsequent calls to other SQLite interface functions. The sqlite3_errstr() interface returns the English-language text that describes the result code, as UTF-8. Memory to hold the error message string is managed internally and must not be freed by the application. When the serialized threading mode is in use, it might be the case that a second error occurs on a separate thread in between the time of the first error and the call to these interfaces. When that happens, the second error will be reported since these interfaces always report the most recent result. To avoid this, each thread can obtain exclusive use of the database connection D by invoking sqlite3_mutex_enter(sqlite3_db_mutex(D)) before beginning to use D and invoking sqlite3_mutex_leave(sqlite3_db_mutex(D)) after all calls to the interfaces listed here are completed. If an interface fails with SQLITE_MISUSE, that means the interface was invoked incorrectly by the application. In that case, the error code and message may or may not be set. See also lists of Objects, Constants, and Functions.