error code for IAsyncOperationWithProgress

Question

Hello all,

I have implemented a socket client for my app. There is a async read interface like this:

IAsyncOperationWithProgress<IBuffer^, unsigned int>^ CSmiHttpClient::ReadAsync(IBuffer^ buffer, 
			unsigned int count, InputStreamOptions options)
{
	m_psBuffer = buffer;
	m_readCompleteEvent = task_completion_event<void>();

	m_cancellationTokenSource = cancellation_token_source();

	mCurReadOp = create_async([this](progress_reporter<unsigned int> progress) {
		task<void> task1 = create_task(m_readCompleteEvent, m_cancellationTokenSource.get_token()).then([this, progress]{
			if (is_task_cancellation_requested())
			{
				cancel_current_task();
				return;
			}
			progress.report(100);
		});
		
		return m_psBuffer; 
	});
}

And i process async call via IAsyncOperationWithProgressCompletedHandler.

IFACEMETHODIMP CReceiveOperation::Invoke( 
    _In_opt_ IAsyncOperationWithProgress<IBuffer*, UINT32> *asyncInfo, AsyncStatus status )
{
    if (asyncInfo == nullptr)
    {
        return E_POINTER;
    }

    ComPtr<IBuffer> spWinRtBuffer;
    HRESULT hrResult = asyncInfo->GetResults(&spWinRtBuffer);
    ComPtr<IMFAsyncResult> spResult;
    ComPtr<IAsyncInfo> spAsyncInfo;
    ComPtr<IInputStream> spInputStream;
    ComPtr<IDataReader> spDataReader;
    DWORD cbBufferLen = 0;

    if (SUCCEEDED(hrResult))
    {
        hrResult = spWinRtBuffer->get_Length(&_cbRead);
    }

    if (SUCCEEDED(hrResult) && _cbRead == 0)
    {
        hrResult = MF_E_NET_READ;
    }

    ComPtr<IUnknown> spThisUnk;
    HRESULT hr = this->QueryInterface(IID_PPV_ARGS(&spThisUnk));

    if (SUCCEEDED(hr))
    {
        hr = MFCreateAsyncResult(spThisUnk.Get(), _spCallback.Get(), _spState.Get(), &spResult);
    }

    if (SUCCEEDED(hr))
    {
        spResult->SetStatus(hrResult);
        hr = MFInvokeCallback(spResult.Get());
    }

    if (SUCCEEDED(asyncInfo->QueryInterface(IID_IAsyncInfo, &spAsyncInfo)))
    {
        spAsyncInfo->Close();
    }

    return hr;
}

Now i want to return some error code when network is bad, how can i set the error code for IAsyncOperationWithProgressCompletedHandler?

thanks

---

haha

Answer 1

I am trying to understand the question: Do you want to know how to set an hr in IAsyncOperationWithProgress, or how to check the network status?

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Yes, you are right.

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haha