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PREfast Warning 325 (Windows CE 5.0)

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325 - Potential comparison of BSTR with NULL BSTRs can be (semantically) null in two ways, i.e., the encoded length of the BSTR is 0 or the pointer itself in NULL.
Question: Did you intend to call SysStringLen?

BSTR values can be semantically NULL in two ways: the encoded length of the BSTR is 0, or the pointer itself in NULL.

Example

Defective Source

BSTR tstr;
int flag;

if (tstr == NULL)
{
 flag = 0;
}

Corrected Source

BSTR tstr;
int flag;

if (SysStringLen(tstr) == 0)
{
 flag = 0;
}

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