WindowsAPI : windows visual studio: recording starts.

Recording test, we prepared.
Their sample always helps us.
Thenk you very much.

HRESULT sounds_recording_start();

HRESULT sounds_recording_start()
{
    HRESULT hr;
    BOOL bDone = FALSE;
    UINT32 packetLength = 0;
    BYTE* pData;
    UINT32 numFramesAvailable;
    DWORD flags;

    hr = pAudioClient->Start();  // Start recording.
    EXIT_ON_ERROR(hr)

        // Each loop fills about half of the shared buffer.
        while (bDone == FALSE)
        {
            // Sleep for half the buffer duration.
            Sleep(hnsActualDuration / REFTIMES_PER_MILLISEC / 2);

            hr = pCaptureClient->GetNextPacketSize(&packetLength);
            EXIT_ON_ERROR(hr)

                while (packetLength != 0)
                {
                    // Get the available data in the shared buffer.
                    hr = pCaptureClient->GetBuffer(
                        &pData,
                        &numFramesAvailable,
                        &flags, NULL, NULL);
                    EXIT_ON_ERROR(hr)

                        if (flags & AUDCLNT_BUFFERFLAGS_SILENT)
                        {
                            pData = NULL;  // Tell CopyData to write silence.
                        }

                    // Copy the available capture data to the audio sink.
                    //x hr = pMySink->CopyData(
                    //x    pData, numFramesAvailable, &bDone);
                    EXIT_ON_ERROR(hr)

                        hr = pCaptureClient->ReleaseBuffer(numFramesAvailable);
                    EXIT_ON_ERROR(hr)

                        hr = pCaptureClient->GetNextPacketSize(&packetLength);
                    EXIT_ON_ERROR(hr)
                }
        }

    hr = pAudioClient->Stop();  // Stop recording.
    EXIT_ON_ERROR(hr)

        Exit:
    CoTaskMemFree(pwfx);
    SAFE_RELEASE(pEnumerator)
        SAFE_RELEASE(pDevice)
        SAFE_RELEASE(pAudioClient)
        SAFE_RELEASE(pCaptureClient)

    return hr;
}