HRESULT DeserializePropVariantFromString(PCWSTR pszIn, PROPVARIANT *ppropvar)
{
HRESULT hr = E_FAIL;
DWORD dwFormatUsed, dwSkip, cbBlob;
// compute and validate the required buffer size
if (CryptStringToBinaryW(pszIn, 0, CRYPT_STRING_BASE64, NULL, &cbBlob, &dwSkip, &dwFormatUsed) &&
dwSkip == 0 &&
dwFormatUsed == CRYPT_STRING_BASE64)
{
// allocate a buffer to hold the serialized binary blob
hr = E_OUTOFMEMORY;
BYTE *pbSerialized = (BYTE *)CoTaskMemAlloc(cbBlob);
if (pbSerialized)
{
// convert the string to a serialized binary blob
hr = E_FAIL;
if (CryptStringToBinaryW(pszIn, 0, CRYPT_STRING_BASE64, pbSerialized, &cbBlob, &dwSkip, &dwFormatUsed))
{
// deserialized the blob back into a PROPVARIANT value
hr = StgDeserializePropVariant((SERIALIZEDPROPERTYVALUE *)pbSerialized, cbBlob, ppropvar);
}
CoTaskMemFree(pbSerialized);
}
}
return hr;
}
// @pymethod <o PyPROPVARIANT>|propsys|StgDeserializePropVariant|Creates a <o PyPROPVARIANT> from a serialized buffer
static PyObject *PyStgDeserializePropVariant(PyObject *self, PyObject *args)
{
PROPVARIANT pv;
SERIALIZEDPROPERTYVALUE *pspv;
ULONG bufsize;
PyObject *ob;
HRESULT hr;
if (!PyArg_ParseTuple(args, "O:StgDeserializePropVariant", &ob))
return NULL;
// @pyparm bytes|prop||Buffer or bytes object (or str in Python 2) containing a serialized value
if (!PyWinObject_AsReadBuffer(ob, (void **)&pspv, &bufsize))
return NULL;
PY_INTERFACE_PRECALL;
hr = StgDeserializePropVariant(pspv, bufsize, &pv);
PY_INTERFACE_POSTCALL;
if (FAILED(hr))
return PyCom_BuildPyException(hr);
return PyWinObject_FromPROPVARIANT(&pv);
};
