


How to Translate Windows API Error Codes into Human-Readable Error Messages?
Nov 22, 2024 am 05:57 AMRetrieving Error Messages from Error Codes: Demystifying GetLastError()
Question:
After invoking Windows API functions, how can we access the corresponding error message in a comprehensible textual format? GetLastError() merely provides numeric error codes.
Answer:
To convert the numerical error code reported by GetLastError() into a meaningful string representation, we employ the following steps:
//Returns the last Win32 error, in string format. Returns an empty string if there is no error. std::string GetLastErrorAsString() { //Fetch the error message ID (if any) DWORD errorMessageID = ::GetLastError(); if (errorMessageID == 0) { return std::string(); //No error message recorded } LPSTR messageBuffer = nullptr; //Request Win32 to translate the error ID into a string representation //We specify options to allocate the message buffer dynamically and retrieve the localized system message 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); //Copy the error message into a string std::string message(messageBuffer, size); //Release the dynamically allocated buffer used by Win32 LocalFree(messageBuffer); return message; }
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