Format Error Message Getlasterror
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over getlasterror formatmessage the past few weeks, and occasionally I’ve getlasterror codes needed to set up some debug points to print errors that getlasterror 2 occur during file and memory I/O. When something goes wrong inside the Win32 API, some methods will getlasterror c# 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
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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
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Forum Visual C++ & C++ Programming Visual C++ Programming GetLastError() printing error If this is your first visit, be sure to http://forums.codeguru.com/showthread.php?515010-GetLastError()-printing-error check out the FAQ by clicking the link above. You may have http://www.cplusplus.com/forum/windows/2068/ to register or Login before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Results 1 to 14 of 14 Thread: GetLastError() printing error Tweet Thread Tools Show Printable Version Email this error message Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode August 2nd, 2011,08:21 AM #1 ekhule View Profile View Forum Posts Member Join Date Mar 2009 Posts 166 GetLastError() printing error Hello, I found this function on the web to print a more verbose error message from GetLastError(): Code: void LastError(LPTSTR lpszFunction) { // Retrieve the format error message 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); 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); cerr << (LPCTSTR)lpDisplayBuf << endl; LocalFree(lpMsgBuf); LocalFree(lpDisplayBuf); } For some reason when I use this, it just prints out hex numbers and no strings.. Can anyone tell me how to fix this to work correctly? Regards, Ellay K. Reply With Quote August 2nd, 2011,08:30 AM #2 VictorN View Profile View Forum Posts Super Moderator Power Poster Join Date Jan 2003 Location Wallisellen (ZH), Switzerland Posts 18,674 Re: GetLastError() printing error Set a break point into this function, debug your application and see in the debugger where those "hex numbers" come from. Victor Nijegorodov Reply With Quote August 2nd, 2011,08:53 AM #3 ekhule View Profile View Forum Posts Member Join Date Mar 2009 Posts 166 Re: GetLastError() printing error I did that, and the problem seems to be here: Code: cerr
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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