How To Repair Wininet Error Codes Formatmessage Tutorial

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Wininet Error Codes Formatmessage

It may be logical though to try to call FormatMessageFromSystem in case FormatMessageFromHMODULE fails for the range of codes from INTERNET_ERROR_BASE to INTERNET_ERROR_LAST. This is rarely, if ever, of value, and as far as I can tell, having worked in three other major operating systems that supported a FormatMessage equivalent, this seems to arise Reply With Quote October 3rd, 2010,07:40 PM #11 Arjay View Profile View Forum Posts Moderator / MS MVP Power Poster Join Date Aug 2004 Posts 12,360 Re: FormatMessage fails to return At the call site, you can do something like CStdioFile f; if(!f.Open(dlg.GetPathName(), CFile::modeWrite | CFile::modeCreate)) { /* failed */ DWORD err = ::GetLastError(); CString errmsg = ErrorString(err); CString fmt; fmt.LoadString(IDS_OPEN_FAILED); CString

Browse other questions tagged c windows winapi wininet formatmessage or ask your own question. This must be a hex string prepended by '0x' prefix. Code readability/reuse is way important than worrying about that. The code uses FormatMessage() WinAPI function.

Why? For example, a message of the form is actually very useful. However, if the flags has been set to FORMAT_MESSAGE_FROM_HMODULE, then the specified module will be searched first; if the error code is not found in that module, then the system error

Newcomer Co./FlounderCraft Ltd., All Rights Reserved Last modified: May 14, 2011 CodeGuru Home VC++ / MFC / C++ .NET / C# Visual Basic VB Forums Register Help Remember A much better example of an error message is the next one. Also WinHttp error messages are located in WINHTTP.DLL and not WININET.DLL. I was using WinHttp* APIs like WinHttpOpen.

In this case, we revert to formatting a simple string. [22] Due to what is poor design, every message gets a \r\n (CRLF) appended to the end of the message. This is not intended to be a full tutorial on using FormatMessage, but simply an example of one of the most effective uses of the the call. Arjay, maybe you can write a static FormatMesageEx function that handles all system error codes from that page above? Thanks.

The reason I started using LoadLibrary instead of GetModuleHandle is because the latter didn't work for me. All rights reserved. I'm sure there'll be many people who can benefit from it in their code. Here is a simulated display of an AfxMessageBox.

  1. Now what seems odd about this is that for a 64-bit app, you might expect that you should be trying to load "WSOCK64.DLL", but it doesn't work that way.
  2. Operation failed." } } The usage is very simple: [↓] [vPodans] Get-ErrorMessage 0x80070005 Access is denied. [↓] [vPodans] # short notation of this error: [↓] [vPodans] Get-ErrorMessage 5 Access is denied.
  3. Yes it works.
  4. Why wasting CPU cycles calling FormatMessageFromHMODULE first for error codes that clearly don't attribute to the wininet library.

more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation The file cannot be opened. Reply With Quote Quick Navigation Visual C++ Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Visual C++ & C++ Programming Visual C++ Programming Visual It was WinInet, and now it's WinHttp..." OK, now I'm officially confused.

Reason: typos Ovidiu Cucu "When in Rome, do as Romans do." My latest articles: Reply With Quote October 3rd, 2010,07:18 AM #9 Arjay View Profile View Forum Posts Moderator check my blog WINHTTP.DLL also works and returns exact same error descriptions. Is there an illusion in the tutorial area? Where will the second Fantastic Beasts film be set?

Mi cuentaBúsquedaMapsYouTubePlayNoticiasGmailDriveCalendarGoogle+TraductorFotosMásShoppingDocumentosLibrosBloggerContactosHangoutsAún más de GoogleIniciar sesiónCampos ocultosBuscar grupos o mensajes Using FormatMessage Home Back To Tips Page The FormatMessage API call is very powerful, and particularly useful for issuing all kinds In every single one of these systems, dating back to 1968, I have had to eliminate the newline sequence from the error string before it was usable! Error code short (low bytes) part. Related 0Why is wparam changing if i use same message, with same paras?0Adding to HIMageList failing, cannot figure out why1Why WinAPI FormatMessage fails, always returns false0C++ WinINet FtpPutFile Error 120031WinInet request

Your tech support people will be greatly aided. Yesterday I wrote a PowerShell script that will convert Win32 error code to a readable text. In general you can find out if an error maps by using the ErrLook.exe tool found found in the \commonN\Tools folder.

Is the Set designed properly?

For that matter, what file? When the error is something that needs to be displayed to the user, you can use my ErrorString function to get a nice CString. asked 6 years ago viewed 2260 times active 3 years ago Blog Stack Overflow Podcast #93 - A Very Spolsky Halloween Special Linked 1 Map errors returned from WinHttpSendRequest using FormatMessage This means that it was unable to find the error code in any of the sources specified.

This allows for internationalization. static CString DefaultError(DWORD err) { CString fmt; fmt.LoadString(IDS_DEFAULT_ERROR); CString s; s.Format(fmt, err, err); return s; } // DefaultError ErrorString for WinINet See also my essay on how to convert CInternetException errors if(Somevalue == NULL) { CString fmt; fmt.LoadString(IDS_INTERNAL_ERROR_23); CString msg; msg.Format(fmt, _T(__FILE__), __LINE__, _T(__FUNCTION__), name); AfxMessageBox(msg, MB_ERROR | MB_OK); return; } ... } where the string is IDS_INTERNAL_ERROR_23 some value Internal error have a peek at these guys You just need to tell FormatMessage() about this in order for it to retrieve the correct message: FormatMessage( // flags: FORMAT_MESSAGE_ALLOCATE_BUFFER // allocate buffer (free with LocalFree()) | FORMAT_MESSAGE_IGNORE_INSERTS // don't

Reply With Quote October 1st, 2010,10:23 PM #2 Arjay View Profile View Forum Posts Moderator / MS MVP Power Poster Join Date Aug 2004 Posts 12,360 Re: FormatMessage fails to return we have called a WinInet function, so wininet.dll is already loaded). Ovidiu Cucu "When in Rome, do as Romans do." My latest articles: Reply With Quote October 3rd, 2010,03:18 Send mail to [email protected] with questions or comments about this web site. The FORMAT_MESSAGE_ALLOCATE_BUFFER tells the API that it should allocate a buffer to hold the message. [16] The FORMAT_MESSAGE_FROM_SYSTEM flag indicates that the error code should be interpreted according to the system

Results 1 to 11 of 11 Thread: FormatMessage fails to return some error description Tweet Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch CString ErrorString(DWORD err) { CString Error; LPTSTR s; if(::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, err, 0, (LPTSTR)&s, 0, NULL) == 0) { /* failed */ // Unknown error code %08x (%d) CString fmt; But I decided to be sure, just in case, with the LoadLibrary. Sometimes the only information you have is Win32 error code and nothing else.

This code checks to see if there is a terminal CRLF... [23] ...and if so, overwrites the \r with a NUL character so the CRLF is truncated. [24] The function is However, do not remove the FORMAT_MESSAGE_IGNORE_INSERTS flag. How to use sort on an awk print command? If putting this functionality into a single method doesn't make sense to you, then you certainly don't have to do it.

It tells what the application-level error is, what file was being considered, and the description of the error code. Hopefully you are working in an environment where you are receiving frequent code reviews. However, this function additionally can produce text messages for network errors. To start viewing messages, select the forum that you want to visit from the selection below.

share|improve this answer edited Aug 12 '13 at 8:09 Cody Gray 147k23279371 answered Jan 29 '10 at 2:22 Shog9♦ 109k28184217 1 wow didn't know this! –Matt Joiner Jan 29 '10 Gettting an error message for an error code it's the last place where even Commander Data can think about "CPU cycles". But, yes, you're right, we don't talk about optimization when we're using MFC, or even worse, .NET framework Originally Posted by ovidiucucu "Miracle! The ErrorString function To make this work, I use the FormatMessage call.

But if the FORMAT_MESSAGE_ALLOCATE_BUFFER flag is specified, it is actually a pointer to a pointer to a character buffer. It was WinInet, and now it's WinHttp..." WinHttp API functions are implemented in WINHTTP.DLL which has no dependences to WININET.DLL. Does profunda also mean philosophically deep?