Parse XML from std::wstring with XmlLite error: 0xc00cee04

Question

Hello,
I am trying to parse the following XML (std::wstring) <message locale="en" log="true" data="'كيف حالك الآن؟">How do you do today?</message> but I get an 0xc00cee04 while reading the node type. Most probably I am not
passing the string content to the stream properly. Here s the code snippet:
CComPtr<IStream> stream;
std::shared_ptr<IXmlReader> reader;
HRESULT hr = S_OK;
COM_VERIFY(CreateStreamOnHGlobal(nullptr, false, (LPSTREAM*)&stream), L"CreateStream"); 
// Write message content into the stream
SIZE_T cbWrite;
COM_VERIFY(stream->Write(message.data(), message.size(), &cbWrite), L"WriteBuffer");
// Move to the beginning of the stream
LARGE_INTEGER position;
position.QuadPart = 0;
COM_VERIFY(stream->Seek(position, STREAM_SEEK_SET, nullptr), L"SeekPosition");
COM_VERIFY(CreateXmlReader(__uuidof(IXmlReader), (void**)&reader, nullptr), L"CreateXmlReader");
COM_VERIFY(reader->SetInput(stream), L"SetInputStream");
XmlNodeType nodeType;
while (!reader->IsEOF())
 hr = reader->Read(&nodeType);
 if (hr != S_OK) break; // <<< Here the error 0xc00cee04
What is the proper way to pass a wstring to IStream?
Thanks,
Pedro

Answer 1

On 4/18/2015 4:02 PM, MsdnDev wrote:
CComPtr<IStream> stream;
std::shared_ptr<IXmlReader> reader;
This makes no sense. shared_ptr will try to delete the pointer, but the COM pointer should be Release'd. You know enough to use CComPtr for IStream - how come you didn't do the same with IXmlReader?
// Write message content into the stream
SIZE_T cbWrite;
COM_VERIFY(stream->Write(message.data(), message.size(), &cbWrite), L"WriteBuffer");
What type is "message"? Is it wstring? If so, message.size() is the size in characters, but IStream::Write expects the size in bytes. You are only writing half the string.
Igor Tandetnik