Access violation Problem with BSTRs

Hi gurus,

Code:

---

        if (bstrParam == NULL)
        {
                CString strOutput("");
                return strOutput;
        }
        else
        {
                CString strOutput(bstrParam);
                return strOutput;
        }

---

Hi gurus I think this is a simple question... but how can I test the value of bstrParam further. I'm getting a problem with the line that says ...CString strOutput(bstrParam) when bstrParam is not properly initialised. How can I test for this? In the debug window bstrParam is 0xcccccccc or something like that.

Thanks.

Maybe IsBadReadPtr?

from MSDN:

IsBadReadPtr

The IsBadReadPtr function verifies that the calling process has read access to the specified range of memory.


BOOL IsBadReadPtr(
const VOID* lp,
UINT_PTR ucb
);

Parameters
lp
[in] Pointer to the first byte of the memory block.
ucb
[in] Size of the memory block, in bytes. If this parameter is zero, the return value is zero.