::CloseHandle throw an exception

[Salvadoravi]

Hi Guys,

CloseHandle()
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

If the application is running under a debugger, the function will throw an exception if it receives either a handle value that is not valid or a pseudo-handle value. This can happen if you close a handle twice, or if you call CloseHandle on a handle returned by the FindFirstFile function instead of calling the FindClose function.

I want to catch the exception but I couldn't find what type it is.
I've tried:

if ( m_hEvent != NULL && m_hEvent != INVALID_HANDLE_VALUE )
{
    try
    {
	::CloseHandle(m_hEvent);
	::CloseHandle(m_hEvent); // Call it again to trigger an exception
    }
			
    catch (const std::exception &e)			
    {				
         AfxMessageBox(_T("This is an exception"));
    }
   
    m_hEvent = NULL;
}

It didn't catch it.
Can anyone tell me what type of exception is thrown?
Do I need to use try catch or checking the handle against null will be enough?


Many thanks

[juanpast]

There are no exception: use GetLastError to know what is happening.

::CloseHandle(m_hEvent);
DWORD dwError = GetLastError();

And chek the value of dwError.



Regards !!

[fred100]

There are no exception

Of course there is an exception !
See the source code of CloseHandle()...

[juanpast]

http://msdn.microsoft.com/en-us/library/aa914720.aspx


I can not read anything about exception...

[Doron Moraz]

http://msdn.microsoft.com/en-us/library/aa914720.aspx
I can not read anything about exception...

Under a debugger CloseHandle() WILL throw an exception when the handle is invalid.

juanpast, you are looking at the Windows CE / Windows Mobile platform.
check: http://msdn.microsoft.com/en-us/libr...11(VS.85).aspx *-)

Do I need to use try catch

No

or checking the handle against null will be enough?

That would deal with the handle validation side of things but it won't prevent from an exception to be thrown if you call CloseHandle() twice.

~CSPEvent()
{
    ::CloseHandle(m_hEvent);  

   // The HANDLE is now invalid
		
    if ( m_hEvent != NULL && m_hEvent != INVALID_HANDLE_VALUE )
    {			
        // That will throw an exception
        ::CloseHandle(m_hEvent); 
        m_hEvent = NULL;
    }
}

Hope it helps
Doron Moraz



EDIT: According to MSDN the function will also throw an exception if you call CloseHandle on a handle returned by the FindFirstFile function instead of calling the FindClose function.

[Salvadoravi]

Thank you !

[juanpast]

Thanks Doron !!!

Sorry to all, I am in a mistake....





Regards !!