Re: Exception handling from a dll

From:

Alex Blekhman <xfkt@oohay.moc>

Newsgroups:

microsoft.public.vc.language

Date:

Wed, 16 May 2007 19:08:10 +0300

Message-ID:

<Oq#pnR9lHHA.3980@TK2MSFTNGP06.phx.gbl>

paulodonohoe@yahoo.com wrote:

I am calling into a dll from a simple driver. the dll has a number of
exported function (extern "C")
I have enabled the compiler switch /EHs to assume that extern C
functions can throw an exception. If I raise an exception in the dll
the exception is never caught by the drivers catch handler

So from the driver :

try
{
    // call into the dll
         LibraryFunctionCall();
}
catch(...)
{

    ...
}

the LibraryFunctionCall simply generates a throw 1 but it never gets
caught by the driver, instead generates a

"First-chance exception at 0x7c812a5b in clientDriver.exe: Microsoft C+
+ exception: int at memory location 0x0012feb0.."

From the Microsoft MSDN it seems that this should be possible.

I tried the above scenario with VC++2005 SP1 and exception
is caught as expected. Also, I get C4297 warning ("function
assumed not to throw an exception but does") when DLL is
compiled. However, everything works properly.

Alex