Why can't this program output the right exception? - c++

Question

The program below outputs only:
0In finally
And not the output:
0 In trans_func Caught a __try exception with SE_Exception In finally
As I expected.
#include "stdafx.h"
// crt_settrans.cpp
// compile with: /EHa
#include <stdio.h>
#include <windows.h>
#include <eh.h>
void SEFunc();
void trans_func( unsigned int, EXCEPTION_POINTERS* );
class SE_Exception
{
private:
unsigned int nSE;
public:
SE_Exception() {}
SE_Exception( unsigned int n ) : nSE( n ) {}
~SE_Exception() {}
unsigned int getSeNumber() { return nSE; }
};
int main( void )
{
try
{
_set_se_translator( trans_func );
SEFunc();
}
catch( SE_Exception e )
{
printf( "Caught a __try exception with SE_Exception.\n" );
}
system("pause");
}
void SEFunc()
{
__try
{
int* buffer= new int[19];
buffer[19]=0;
printf("%d",buffer[19]);
delete buffer;
}
__finally
{
printf( "In finally\n" );
}
}
void trans_func( unsigned int u, EXCEPTION_POINTERS* pExp )
{
printf( "In trans_func.\n" );
throw SE_Exception();
}

Answer 1

trans_func will only be called in order to handle a structured exception.
But your code doesn't seem to trigger an SEH exception :
int* buffer= new int[19];
buffer[19]=0;
printf("%d",buffer[19]);
delete buffer;
Maybe you should try something a bit more brutal :
volatile int *pInt = 0x00000000;
*pInt = 20;
That example is directly taken from MSDN.