Home > Error Message > Getlasterror Formatmessage

Getlasterror Formatmessage

Contents

Syntax C++ Copy DWORD WINAPI FormatMessage( _In_     DWORD   dwFlags, _In_opt_ LPCVOID lpSource, _In_     DWORD   dwMessageId, _In_     DWORD   dwLanguageId, _Out_    LPTSTR  lpBuffer, _In_     DWORD   nSize, _In_opt_ va_list *Arguments ); Parameters dwFlags [in] The formatting options, and how to interpret FormatMessage() uses LMEM_FIXED, so HeapFree can be used. And Delphi example is here: function GetLastErrorText: string; var C: array[Byte] of Char; begin FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM, nil, GetLastError, LOCALE_USER_DEFAULT, C, SizeOf(C), nil); Result:=C; end; Software for developers Delphi Components .Net Components Multiple threads do not overwrite each other's last-error code.

lpMsgBuf = LocalFree(lpMsgBuf); return sRet; } catch (Exception e) { return "Unable to get error code string from System -> " + e.ToString(); } } } share|improve this answer answered Jan lpSource [in, optional] The location of the message definition. My compiler seems not to recognize the header file . The type of this parameter depends upon the settings in the dwFlags parameter. http://stackoverflow.com/questions/1387064/how-to-get-the-error-message-from-the-error-code-returned-by-getlasterror

Getlasterror Formatmessage

Probably it should be just a char*, cuz my compiler gives me an error cannot convert ‘wchar_t*’ to ‘LPSTR {aka char*}’ for argument ‘5’. –Hi-Angel Aug 13 '14 at 7:59 2 Very friendly, isnt't it? It would be great to show some clear text message, which he could send to us with angry reports about program instability... The default is to treat each value as a pointer to a null-terminated string.

The workaround is to use the StringCchPrintf function to format the floating-point number into a temporary buffer, then use that buffer as the insert string. This escape sequence can be used to build up long lines or to terminate the message itself without a trailing new line character. May 23, 2008 at 2:50pm UTC Amag (8) I wanna know why my Dialog Box creation is failing by retrieving the last error code. Getlasterror 126 So I did some research and got something on http://msdn.microsoft.com/en-us/library/ms679360 MSDN has suggested the following code: 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#include #include void ErrorExit(LPTSTR lpszFunction) { // Retrieve the system error message

FORMAT_MESSAGE_ARGUMENT_ARRAY 0x00002000 The Arguments parameter is not a va_list structure, but is a pointer to an array of values that represent the arguments. Easy on brain –Sreekar Jun 10 '15 at 6:24 add a comment| up vote 18 down vote MSDN has some sample code that demonstrates how to use FormatMessage() and GetLastError() together: Arguments [in, optional] An array of values that are used as insert values in the formatted message. You could also do the same thing with PInvoke by calling the FormatMessage function, but I am lazy and keep as much in C# as I can.

This flag cannot be used with FORMAT_MESSAGE_FROM_HMODULE or FORMAT_MESSAGE_FROM_SYSTEM. Formatmessagew The low-order byte can also specify the maximum width of a formatted output line. The 10'000 year skyscraper When I added a resistor to a set of christmas lights where I cut off bulbs, it gets hot. The output buffer cannot be larger than 64K bytes.

Getlasterror Codes

GetLastError() returns an integer value, not a text message. http://www.aaronstannard.com/win32-errors-how-to-format-getlasterror()-output-into-readable-strings/ Topic archived. Getlasterror Formatmessage ServrTrackr - Monitor your SSL certificates, website uptime, and DNS configurations Getlasterror 2 The nSize parameter specifies the minimum number of TCHARs to allocate for an output message buffer.

If this flag is set, the Arguments parameter is ignored.   The low-order byte of dwFlags can specify the maximum width of a formatted output line. Most functions that set the thread's last-error code set it when they fail. Do Not Call GetLastError() ! The function stores hard-coded line breaks in the message definition text into the output buffer. Getlasterror C#

Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! The message definition may contain insert sequences, just as the message text in a message table resource may. The function stores line breaks that are in the message definition text into the output buffer. Additionally, FormatMessage supports a flag that will read the string from an operating system message table.

It seems to be worth it. Str_elems Just a quick note as well: These error messages are not always useful. The format string (which must be surrounded by exclamation marks) is optional and defaults to !s!

If the function fails, the return value is zero.

  1. Remarks You should call the GetLastError function immediately when a function's return value indicates that such a call will return useful data.
  2. Syntax C++ Copy DWORD WINAPI GetLastError(void); Parameters This function has no parameters.
  3. This flag cannot be used with FORMAT_MESSAGE_FROM_STRING.
  4. The last-error code is maintained on a per-thread basis.

FormatMessage function Formats a message string. Any clue what the equivalent of strsafe.h in Dev-C++ is? Thanks for the heads up, fixed it in my own code base (and my answer). C# Getlasterror Message See Also FormatMessage, SetLastError, SetLastErrorEx Comment from Greatis Sofware GetLastError function is unique.

The following example includes an error-handling function that prints the error message and terminates the process. May 28, 2008 at 11:05pm UTC Duoas (10453) As long as it is linked to the Win32 library it can do anything it wants. Often times they are not very descriptive, but at least you don't have to reference the error code number against a long list to find out what is going on. The interpretation of each value depends on the formatting information associated with the insert in the message definition.

I figured I would quickly post a snippet that you can use in C# to get an actual textual error back instead of just the Windows error code that is returned May 28, 2008 at 7:09pm UTC guestgulkan (2942) That is not a GUI program - I wouldn't think that a DOS program (like yours) would be able to display a MessageBox.. They must be used before subsequent arguments are used. DWORD GetLastError(VOID) Parameters This function has no parameters.

But passing it the pointer's address (pointer-to-a-pointer), but casting it to a regular pointer... Shouldn't TS accepted this answer? –swdev Apr 15 '14 at 20:47 If it's necessary for a further throwing there is a simpler way to do it in C# with If you are defining an error code for your application, set this bit to one. 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.

This parameter is ignored if dwFlags includes FORMAT_MESSAGE_FROM_STRING. This documentation is archived and is not being maintained. Some compilable code of mine follows. Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you!

This parameter can be one or more of the following values. lpBuffer [out] A pointer to a buffer that receives the null-terminated string that specifies the formatted message. The function copies the formatted message text to an output buffer, processing any embedded insert sequences if requested. You can cast the error into a textual string by doing the following in C#: string errorMsg = new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error()).Message; This will then return an actual string of the error that