Home > Error Code > Winapi Error Code To String

Winapi Error Code To String

Contents

Escape sequenceMeaning %0Terminates a message text line without a trailing new line character. Notify me of new posts by email. The buffer must be declared TCHAR, and cast to LPTSTR. FORMAT_MESSAGE_MAX_WIDTH_MASK 0x000000FF The function ignores regular line breaks in the message definition text. http://pubdimensions.com/error-code/winapi-error-code.php

Home Consulting About Talks Open Source Win32 Errors: How to Format GetLastError() Output into Readable Strings November 13, 2013 I’ve been doing a moderate amount of native Win32 C++ programming over FORMAT_MESSAGE_IGNORE_INSERTS 0x00000200 Insert sequences in the message definition are to be ignored and passed through to the output buffer unchanged. These values are also defined in the corresponding header (.h) files with the Microsoft Windows Platforms SDK or DDK. Used to indicate HRESULT values that are not status values, but are instead message ids for display strings. http://stackoverflow.com/questions/1387064/how-to-get-the-error-message-from-the-error-code-returned-by-getlasterror

Getlasterror Codes

Win32 weirdness. Required fields are marked *Comment Name * Email * Website Time limit is exhausted. Return value The return value is the calling thread's last-error code. Multiple threads do not overwrite each other's last-error code.

This format string can be used to include a single period at the beginning of a line without terminating the message text definition. %!A single exclamation point. Unsourced material may be challenged 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 share|improve this answer answered Sep 7 '09 at 0:10 Jonathan Graehl 7,3342335 add a comment| up vote 9 down vote In general, you need to use FormatMessage to convert from a Formatmessagew lpBuffer [out] A pointer to a buffer that receives the null-terminated string that specifies the formatted message.

dwFlags SettingMeaning FORMAT_MESSAGE_FROM_HMODULE 0x00000800 A handle to the module that contains the message table to search. Getlasterror To String These escape sequences and their meanings are shown in the following tables. other_error, // library generated error security_error, // includes access rights, permissions failures read_only_error, io_error, path_error, not_found_error, // not_directory_error, busy_error, // implies trying again might succeed already_exists_error, not_empty_error, is_directory_error, out_of_space_error, out_of_memory_error, out_of_resource_error, https://msdn.microsoft.com/en-us/library/windows/desktop/ms679351(v=vs.85).aspx Hard-coded line breaks are coded with the %n escape sequence.

LocalFree(messageBuffer); return message; } share|improve this answer edited Jul 18 '15 at 0:05 answered Jun 30 '13 at 4:32 Jamin Grey 4,63022133 1 I believe you actually need to pass Getlasterror C# If you want to repeat "Bill", as in the previous example, the arguments must include "Bill" twice. The severity code indicates whether the return value represents information, warning, or error. The formatted string would then be "  Bi Bob   Bill".

Getlasterror To String

Please help improve this article by adding citations to reliable sources. Tweet Follow @Aaronontheweb P.S. Getlasterror Codes Windows 10:  LocalFree is not in the modern SDK, so it cannot be used to free the result buffer. Getlasterror Formatmessage This flag cannot be used with FORMAT_MESSAGE_FROM_STRING.

Privacy policy About Wikipedia Disclaimers Contact Wikipedia Developers Cookie statement Mobile view this contact form You can always find phrase "If the function fails, the return value is blah-blah-blah. The caller should use the LocalFree function to free the buffer when it is no longer needed. The error code is a unique number that is assigned to represent the exception. Getlasterror 2

To convert a system error into an HRESULT value, use the HRESULT_FROM_WIN32 macro. How to use sort on an awk print command? Some functions call SetLastError under conditions of success; those cases are noted in each function's reference page. have a peek here Please enable JavaScript to view the comments powered by Disqus.

By the way there's C example in FormatMessage topic. Str_elems This parameter is ignored if dwFlags includes FORMAT_MESSAGE_FROM_STRING. nSize [in] If the FORMAT_MESSAGE_ALLOCATE_BUFFER flag is not set, this parameter specifies the size of the output buffer, in TCHARs.

When something goes wrong inside the Win32 API, some methods will return a system error code directly (such as all of the registry methods) and others will simple return a NULL

std::string GetLastErrorAsString() { //Get the error message, if any. The function copies the formatted message text to an output buffer, processing any embedded insert sequences if requested. The function finds the message definition in a message table resource based on a message identifier and a language identifier. Getlasterror 126 This format string is useful when FormatMessage is supplying regular line breaks so the message fits in a certain width. %rA hard carriage return without a trailing newline character. %tA single

Error codes are 32-bit values (bit 31 is the most significant bit). Therefore, do not use untrusted or unknown message strings with inserts enabled because they can contain more insertion sequences than Arguments provides, or those that may be of the wrong type. If you want to include error messages from your own modules, you'll need to add the FORMAT_MESSAGE_FROM_HMODULE flag, and provide the handle to the module. Check This Out Generally, successful functions return the S_OK HRESULT value (which is equal to zero).

When HRESULTs are displayed, they are often rendered as an unsigned hexadecimal value, usually indicated by a 0x prefix. Do Not Call GetLastError() ! Most functions in the Win32 API that set the thread's last error code value set it when they fail; a few functions set it when they succeed. Facility - indicates the system service that is responsible for the error.

FORMAT_MESSAGE_FROM_STRING 0x00000400 The lpSource parameter is a pointer to a null-terminated string that contains a message definition. Sum other numbers Reverse Lookup: getting keys from values Why can't the second fundamental theorem of calculus be proved in just two lines? 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 is built up from three basic parts, the high bits indicate the severity, the middle bits encode the facility which indicates the source of the error, the low 16 bits

It does pop up in some shell wrapper functions, like SHGetValue(). 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 For example, the insert numbers for the previous example could change to "%1!*.*s! %4 %5!*s!". That is because some functions call SetLastError with a zero when they succeed, wiping out the error code set by the most recently failed function.

Like ERROR_FILE_NOT_FOUND is mapped from the STATUS_OBJECT_NAME_NOT_FOUND file system driver error code. The more advanced features of the IErrorInfo error mechanisms—help links, and on-demand localization—are rarely used. Important: LocalAlloc() has different options: LMEM_FIXED, and LMEM_MOVABLE. lpSource [in, optional] The location of the message definition.

Outer Space. LPWSTR GetFormattedMessage(LPWSTR pMessage, ...) { LPWSTR pBuffer = NULL; va_list args = NULL; va_start(args, pMessage); FormatMessage(FORMAT_MESSAGE_FROM_STRING | FORMAT_MESSAGE_ALLOCATE_BUFFER, pMessage, 0, 0, (LPWSTR)&pBuffer, 0, &args); va_end(args); return pBuffer; } Requirements Minimum supported For example, if the source string is "%1!*.*s! %4 %5!*s!", the arguments could be, 4, 2, Bill, Bob, 6, Bill (if using the FORMAT_MESSAGE_ARGUMENT_ARRAY flag).