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The message definition can come from a buffer passed into the function. So I did some research and got something on MSDN has suggested the following code: 1
#include #include void ErrorExit(LPTSTR lpszFunction) { // Retrieve the system error message All you need to use it is to #include "atlstr.h". dwFlags SettingMeaning FORMAT_MESSAGE_FROM_HMODULE 0x00000800 A handle to the module that contains the message table to search.

If FORMAT_MESSAGE_ALLOCATE_BUFFER is set, this parameter specifies the minimum number of TCHARs to allocate for an output buffer. Also, GCDEF's code did not work at all. If the module has no message table resource, the function fails with ERROR_RESOURCE_TYPE_NOT_FOUND. Find complete coverage of the WPF, WCF, and WF foundations that support the core .NET platform.

It is ultra thin and the ink bleeds through from the back of the page. In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations? Whether you are moving to .NET for the first time or are already writing applications on .NET 2.0 or .NET 3.5, this book will provide you with a comprehensive grounding in Jun 5, 2008 at 1:31pm UTC Amag (8) Sorry I took too much time to react.

GetLastError function Retrieves the calling thread's last-error code value. 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), The function finds the definition in a message table resource based on a message identifier and a language identifier. Pro The Ultimate DevOps Toolkit lstring - A lightweight wrapper for std::string Deep Learning on Windows: A Getting Started Guide Pro Is your Database Ready for the Era of Big Data?

FORMAT_MESSAGE_FROM_HMODULE 0x00000800 The lpSource parameter is a module handle containing the message-table resource(s) to search. GetLastError() returns an integer value, not a text message. This escape sequence can be used to build up long lines or to terminate the message itself without a trailing new line character. If the function fails, the return value is zero.

This is especially important after a error that may have left your system in a fragile state. The function finds the message definition in a message table resource based on a message identifier and a language identifier. This again is for portability with Unicode. LPTSTR Error = 0; FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), 0, (LPTSTR)&Error, 0, NULL); cerr << Msg << (LPTSTR)Error << endl; LocalFree(Error); } Reply With Quote August 2nd, 2011,09:32 AM #9 ekhule

Repeating insert numbers when the source string contains width and precision specifiers may not yield the intended results. Some compilable code of mine follows. Block for plotting a function using different parameters Why are unsigned numbers implemented? Then inside the window "The specified procedure could not be found." along with Yes and No buttons.

The dwError is set in the parameter list by GetLastError(). SetWindowsHookEx Fails Return NULL HHOOK And GetLastError Returns Error Code 1260Do Windows GDI APIs return error code in GetLastError?2How to prevent JNI from overwriting GetLastError()2Is it possible to check if error Table of Contents Introducing VB 2010 Building Visual Basic 2010 Applications Core VB 2010 Programming Constructs, Part I Core VB 2010 Programming Constructs, Part II Defining Encapsulated Class Types Understanding Inheritance The following are possible values of the low-order byte.

On ANSI or DBCS the string is define as char type. up vote 65 down vote favorite 17 After a Windows API call, how can I get the last error message in a textual form? Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / STL Managed C++/CLI You can check out his blog at

We appreciate your feedback. If dwFlags includes FORMAT_MESSAGE_ALLOCATE_BUFFER, the function allocates a buffer using the LocalAlloc function, and places the pointer to the buffer at the address specified in lpBuffer. If you do not have a pointer of type va_list*, then specify the FORMAT_MESSAGE_ARGUMENT_ARRAY flag and pass a pointer to an array of DWORD_PTR values; those values are input to the The following example shows how to use an argument array and the width and precision specifiers.

Calling this function usually resets the operating system error state. C++ Copy #ifndef UNICODE #define UNICODE #endif #include #include void main(void) { LPWSTR pMessage = L"%1!*.*s! %4 %5!*s!"; DWORD_PTR pArgs[] = { (DWORD_PTR)4, (DWORD_PTR)2, (DWORD_PTR)L"Bill", // %1!*.*s! All escape sequences start with the percent character (%). Example of using MessageBox() ============================= IUnknown *(*pfnCreateObject)(void) = 0; *(FARPROC*)&pfnCreateObj = GetProcAddress(hInstDLL,"_CreateObj"); if (!pfnCreateObject) ErrorMessage("GetProcAddress"); If the GetProcAddress() above failed a MessageBox() would pop up with the caption: "GetProcAddress failed with

dwLanguageId [in] The language identifier for the requested message. This flag cannot be used with 64-bit integer values. Reply With Quote August 2nd, 2011,09:00 AM #4 GCDEF View Profile View Forum Posts Elite Member Power Poster Join Date Nov 2003 Location Florida Posts 12,481 Re: GetLastError() printing error I std::string GetLastErrorAsString() { //Get the error message, if any.

Hard-coded line breaks are coded with the %n escape sequence. The caller optionally can ask the function to search the system's message table resources for the definition. Pro VB 2010 and the .NET 4.0 Platform provides developers with a complete guide to the new technology, explaining the importance of all the key VB 2010 language features. Why is it a bad idea for management to have constant access to every employee's inbox?

His articles can be read at, and he also reviews .NET preparation kits, available at This flag cannot be used with FORMAT_MESSAGE_FROM_HMODULE or FORMAT_MESSAGE_FROM_SYSTEM. Reply With Quote August 2nd, 2011,09:27 AM #7 GCDEF View Profile View Forum Posts Elite Member Power Poster Join Date Nov 2003 Location Florida Posts 12,481 Re: GetLastError() printing error Originally How should I interpret "English is poor" review when I used a language check service before submission?

ValueMeaning FORMAT_MESSAGE_ALLOCATE_BUFFER 0x00000100 The function allocates a buffer large enough to hold the formatted message, and places a pointer to the allocated buffer at the address specified by lpBuffer. The function generates no new line breaks.   If the low-order byte is a nonzero value other than FORMAT_MESSAGE_MAX_WIDTH_MASK, it specifies the maximum number of characters in an output line. The function finds the message definition in a message table resource based on a message identifier and a language identifier. I dont see the text anywhere..

Most functions that set the thread's last-error code set it when they fail. This buffer cannot be larger than 64K bytes. Define "did not work". CString FormatErrorMessage(DWORD ErrorCode) { TCHAR *pMsgBuf = NULL; DWORD nMsgLen = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, ErrorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), reinterpret_cast(&pMsgBuf), 0, NULL); if (!nMsgLen) return _T("FormatMessage fail"); CString sMsg(pMsgBuf, nMsgLen);

It doesn't support Unicode - you can rewrite it to use std::wstring and FormatMessageW() - but I don't work with Unicode or Widechars myself, so I wouldn't know for sure how Reply With Quote August 2nd, 2011,09:52 AM #13 ekhule View Profile View Forum Posts Member Join Date Mar 2009 Posts 166 Re: GetLastError() printing error Ah ok, this works now: Code: This parameter is ignored if dwFlags includes FORMAT_MESSAGE_FROM_STRING. The last-error code is maintained on a per-thread basis.

However, over the years that author Andrew Troelsen spent working with the common language runtime (CLR), he gained a much deeper understanding of the .NET platform and the subtleties of the