🚀 go-pugleaf

In an earlier article Michael Falcon-Gates wrote:

> Oh, boy! (I love this one.) There are two completely separate 
> exception handling mechanisms going on here. If you use the C++ 
> "catch" keyword, the only way you can catch operating-system
> exception is to use catch (...), and you can get no information
> about the exception.

Not true. Look up _set_se_translator in the VC reference manual. This
function can be used to install a filter which catches SEH exceptions
and translates them to C++ exceptions. It works pretty well - see the
code below for a trivial example of it in use.

===============

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <eh.h>

class CSystemException {

	public:
		CSystemException(UINT uCode)
		{
			m_uCode = uCode;
			}

		CSystemException(CSystemException const &Src)
		{
			m_uCode = Src.m_uCode;
			}

		UINT GetCode(void) const
		{
			return m_uCode;
			}

	protected:		
		UINT m_uCode;
	};

void ExceptionTranslator(UINT uCode, EXCEPTION_POINTERS *pInfo)
{
	throw CSystemException(uCode);
	}

void main(void)
{
	_set_se_translator(ExceptionTranslator);
	
	try {
		int *pData = NULL;
		
		pData[0] = 1;
		}
		
	catch(CSystemException const &Ex) {

		UINT uCode = Ex.GetCode();

		printf("Caught code %X\n", uCode);
		}

	exit(0);
	}

===============

-- 
Mike Granby
Paradigm Controls Limited