TheIronDuke
asked on
Getting error information from catch(...)
I am managing exceptions using C++ MFC using the catch(...) option. Is there any way to get more information using this exception handler, more than just "and exception occurred"? Like Windows getLastError() or something?
Any help would be appreciated.
Any help would be appreciated.
void myProgram
{
CStdioFile file;
CString szPath = _T("Myfile.txt");
CString szData,szError;
bool bFound = false;
int nErrors = 0;
TCHAR szCause[255];
try
{
file.Open(szPath, CFile::modeNoTruncate | CFile::modeReadWrite);
file.SeekToEnd();
while( file.ReadString(szData) && !bFound && !nErrors )
{
if( szData.Find(_T("MyName="),0) >= 0 )
{
someProcessProgram(szData);
bFound = true;
}
}
file.Close();
}
catch( CException* e )
{
e->GetErrorMessage(szCause,255);
e->Delete();
szError.Format(_T("An exception occurred while reading data.\nWindows reports: %s"),szCause);
nErrors++;
AfxMessageBox(szError);
}
catch( std::exception* e )
{
szError.Format(_T("An exception occurred while reading data.\nWindows reports: %s"),e->what());
nErrors++;
AfxMessageBox(szError);
}
catch(...)
{
szError = _T("An exception occurred while reading data.");
nErrors++;
AfxMessageBox(szError);
}
}
Last Comment
Manuel Flores
You could return or show the CFileException::GetErrorMe
ASKER
I was more interested in what I can get from the "catch(...)" exception.
CException should give me CFileException exceptions, correct? At least that's the way I understand it.
CException should give me CFileException exceptions, correct? At least that's the way I understand it.
Exactly because is an abstract class implemented by all CXXXXExceptions subclasses.
I think indeed that the way you have programmed it, i.e. using the superclass, will catch all errors.
Anyway; you can't actually see the exception variable that is thrown when using catch(...)
I think indeed that the way you have programmed it, i.e. using the superclass, will catch all errors.
Anyway; you can't actually see the exception variable that is thrown when using catch(...)
Some tips from other forums;
"....This is how you can reverse-engineer the exception type from within catch(...) should you need to (may be useful when catching unknown from a third party library) with GCC:
catch(...)
{
std::exception_ptr p = std::current_exception();
std::clog <<(p ? p.__cxa_exception_type()->
}
"....This is how you can reverse-engineer the exception type from within catch(...) should you need to (may be useful when catching unknown from a third party library) with GCC:
catch(...)
{
std::exception_ptr p = std::current_exception();
std::clog <<(p ? p.__cxa_exception_type()->
}
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I have recommended this question be closed as follows:
Split:
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-- pepr (https:#a41748372)
-- sarabande (https:#a41747588)
If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.
frankhelk
Experts-Exchange Cleanup Volunteer
I have recommended this question be closed as follows:
Split:
-- Zoppo (https:#a41748384)
-- pepr (https:#a41748372)
-- sarabande (https:#a41747588)
If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.
frankhelk
Experts-Exchange Cleanup Volunteer
C++
C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.
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