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How To Get Error String From Getlasterror

here for a quick overview of the site Help Center Detailed answers to any questions you might getlasterror to string c++ have Meta Discuss the workings and policies of this site About delphi getlasterror to string Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads convert getlasterror to string with 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 getlasterror example c++ 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 in a textual form? GetLastError() returns an

Getlasterror Codes

integer value, not a text message. Thanks. c++ c winapi share|improve this question edited Jan 21 '15 at 19:24 Mr.C64 19.2k64180 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 this answer edited Jul 18 '15 at 0:05 answered Jun 30 '13 at 4:3

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Getlasterror Formatmessage

the past few weeks, and occasionally I’ve getlasterror 2 needed to set up some debug points to print errors that getlasterror c# 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

did some research and got something on http://msdn.microsoft.com/en-us/library/ms679360 MSDN has suggested the following code: 1
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#include #include void ErrorExit(LPTSTR lpszFunction) { // Retrieve the getlasterror to system error message for the last-error code LPVOID lpMsgBuf; LPVOID lpDisplayBuf; DWORD dw = GetLastError(); FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dw, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf, 0, NULL ); // Display the getlasterror to string error message and exit the process lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, (lstrlen((LPCTSTR)lpMsgBuf)+lstrlen((LPCTSTR)lpszFunction)+40)*sizeof(TCHAR)); StringCchPrintf((LPTSTR)lpDisplayBuf, LocalSize(lpDisplayBuf) / sizeof(TCHAR), TEXT("%s failed with error %d: %s"), lpszFunction, dw, lpMsgBuf); MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK); LocalFree(lpMsgBuf); LocalFree(lpDisplayBuf); ExitProcess(dw); } void main() { // Generate an error if(!GetProcessId(NULL)) ErrorExit(TEXT("GetProcessId")); } MSDN says one should link with the Kernel32.lib and use the Kernel32.dll to compile successfully. As I'm using Dev-C++, I linked with libkernel32.a but the above mentioned code is compiling with errors. What does it mean to use the Kernel32.dll so that this code can compile successfully? Is there any other way to retrieve the last err

 
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