Calling all Exceptions Guru's

[gingerspen]

I'm new to exceptions and I find myself struggling a little. Can some tell me why this doesn't work?


FILE* hFile;

try
{
// Assume hFile has not been initialised on purpose to generate exception

//This should raised an exception and jump to the catch block.
fputs("123", hFile);
......
}
catch( ... )
{
Do_something();
}


As I understand it, catch( ...) should catch all exceptions but in this case it doesn't. Can anyone help?

Spencer

[Paul McKenzie]

Originally posted by gingerspen
I'm new to exceptions and I find myself struggling a little. Can some tell me why this doesn't work?

The 'C' FILE* streams do not throw exceptions. Unless the underlying fputs() code does a divide by 0, an illegal kernel memory access, or something else that would trigger a system crash, an exception will never be thrown.

Regards,

Paul McKenzie

[Andreas Masur]

In addition to Paul's answer...the exception mechanism was introduced with C++ therefore it will not work with ANSI C standard functions...

[gingerspen]

Originally posted by Paul McKenzie
The 'C' FILE* streams do not throw exceptions. Unless the underlying fputs() code does a divide by 0, an illegal kernel memory access, or something else that would trigger a system crash, an exception will never be thrown.

Regards,

Paul McKenzie

Paul, thank you very much for your help.

Spencer

[gingerspen]

Originally posted by Andreas Masur
In addition to Paul's answer...the exception mechanism was introduced with C++ therefore it will not work with ANSI C standard functions...

Andreas, thank you very much for your help.

Spencer

[Gabriel Fleseriu]

As a side comment: C++ exceptions are synchronous. There is a second kind of exceptions, structured exceptions (SE), that are asynchronous (and are not part of the C++ standard). An access violation is a SE. Now, Microsoft claims that a C++ catch(...) handler (note the ellipsis) will also catch SEs (VC 6.0). However I saw at least one example where this wasn't true.