Getting Unknown Error By GetLastError()

Question

1.00/5 (2 votes)

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Hi,
I am using below function for finding my error:

C++

{
  DWORD err = GetLastError();

  LPVOID lpMsgBuf;

  FormatMessage(
    FORMAT_MESSAGE_ALLOCATE_BUFFER |
    FORMAT_MESSAGE_FROM_SYSTEM |
    FORMAT_MESSAGE_IGNORE_INSERTS,
    NULL,
    GetLastError(),
    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
    (LPTSTR) &lpMsgBuf,
    0,
    NULL
  );
  MessageBox( NULL, (LPCTSTR)lpMsgBuf, f2, MB_OK | MB_ICONINFORMATION );


  // Free the buffer.
  LocalFree( lpMsgBuf );
}

I got below error:
http://fxturn.com/error/error.jpg[^]

What means this error?
Regards,

Posted 9-Sep-11 6:56am

rezafx

Updated 9-Sep-11 12:29pm

Philippe Mori

v2

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CPallini 9-Sep-11 15:30pm

If it is for debugging purposes, why don't you get the numerical value and use the Error Lookup tool of Visual Studio?

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Chris Meech · Answer 1 · 2011-09-09T07:45:00

In the parameters to FormatMessage, you are calling GetLastError again. This will not get you a message about your error value, err. It will most likely get you something odd, since you've already called GetLastError prior to the call to FormatMessage. :)

[EDIT]

FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
err,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);

You may need to pass in the actual err value that you want a message for. :)

rezafx · Answer 2 · 2011-09-09T08:03:00

Solution 2

Hi,
I used one time but I got same error again.
Regards,

Posted 9-Sep-11 8:03am

rezafx

Comments

Philippe Mori 9-Sep-11 18:35pm

Please, reply under the solution you want to comment. By the way, check the value of err with a debugger and be sure it is not 0.

rezafx · Answer 3 · 2011-09-09T09:27:00

Solution 3

Hi,
I done same that but same error too.
Regards,

Posted 9-Sep-11 9:27am

rezafx

Paul M Watt · Answer 4 · 2011-09-09T20:12:00

Solution 4

Do you always get that empty output with an error, or is it a specific error at the same point in your code.

If it is the same error, it would be useful to know what the error code GetLastError returns for you.

Posted 9-Sep-11 20:12pm

Paul M Watt

rezafx · Answer 5 · 2011-09-09T20:27:00

Solution 5

Hi,
Return error:

VB

ERROR_WINHTTP_TIMEOUT

    12002

Regards,

Posted 9-Sep-11 20:27pm

rezafx

Getting Unknown Error By GetLastError()

5 solutions

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