asked on

tryin to GetErrorMessage(...) from CFileException cause an assertion.

catch(CFileException *ex)
{
TCHAR szCause[255];
ex->GetErrorMessage(szCause,255);
ex->Delete();
}

when the program enter the catch block and try to execute GetErrorMessage then an exception occur which cause a popup message "Debug assertion failed!" to appear.
I am using a console application project with MFC in DLL.

Kocil

catch(CFileException ex)
{
TCHAR szCause[255];
ex.GetErrorMessage(szCause,255);
}

ASKER CERTIFIED SOLUTION

Kocil

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

RattleSnake

If nothing helps, you might want to try this wrapper for FormatMessage I coded a while ago and pass the error code to it. Not sure if this would solve your problem:

CString GetLastErrorMessage(DWORD dwErr)
{
try
{
LPVOID lpMsgBuf;

DWORD dwError = dwErr ? dwErr : GetLastError();

DWORD dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS;

DWORD dwLang = MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT);

DWORD dwBytes = FormatMessage(dwFlags,NULL,dwError,dwLang,
(LPTSTR) &lpMsgBuf, 0, NULL);

if (dwBytes == 0) {
return CString("Unknown");
}

CString sMessage((char*)lpMsgBuf);
LocalFree(lpMsgBuf);
return sMessage;
}

catch (...)
{
return CString("Unknown");
}
}

And then:

catch(CFileException *e)
{
CString err = GetLastErrorMessage(e->m_lOsError);
}

tinchos

No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Answered by: Kocil

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Tinchos
EE Cleanup Volunteer