Question and Answer Database
FAQ1750C.txt Catching an access violation exception
Category :C/C++ Language Issues
Platform :All
Product :BC++ 5.x
Question:
Why does my attempt at catching an access violation fail?
main()
{
char *ptr;
ptr=NULL;
try
{
*ptr=5;
}
catch(...)
{
cerr << "Caught exception" << endl;
}
}
Answer:
You are trying to catch a C++ exception ( which means that there
must be a matching "throw" somewhere for you to catch anything ).
You could use that construct to handle thrown objects ( like
xalloc for failures in calls to new ).
For OS excpetions like access violations, you should be using
OS structured exception handling:
// catch.cpp
#include
#include
main()
{
char *ptr;
// point the pointer to an
// invalid address
ptr=NULL;
try
{
// attempt to assign a value
// to the location pointed
// to by the pointer
*ptr=5;
}
except(EXCEPTION_EXECUTE_HANDLER)
{
// report the exception type
cerr << "Caught exception code: 0x"
<< hex << GetExceptionCode()
<< endl;
}
}
see:
__try
__except
RaiseException
7/2/98 10:32:32 AM
Last Modified: 01-SEP-99