Save video file properties

Question

Hi,

I have a store app which creates videos and uploads to YouTube.  I would like to store info in the video file so I can tell if the user has already uploaded a file.  So I tried the following code

StorageFolder^ folder = KnownFolders::VideosLibrary;
String^ fname = ref new String(L"abctest.mp4");
task<StorageFile^>(folder->GetFileAsync(fname)).then([this](StorageFile^ file)
  {
    m_file = file;
    return m_file->Properties->GetVideoPropertiesAsync();
  }).then([this](VideoProperties^ vp)
  {
    String^ pub = vp->Publisher;
    vp->Publisher = ref new String(L"TestPublisher");
    return m_file->Properties->SavePropertiesAsync();
  }).then([this](task<void> tvoid)
  {
    try
    {
      tvoid.get();
    }
    catch (Exception ^e)
    {
    	HandleException ( e->Message->Data() );
    }
  });

I would expect the second time I run this pub would be assigned "TestPublisher".  

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SAP

Answer 1

In your code you are trying to save the default properties of the file by doing a m_file->Properties->SavePropertiesAsync. The Publisher property is a property of the VideoProperties, so when you try to set the Publisher property, you should try to do a vp->SavePropertiesAsync() to get the correct behavior.

Here's the code that should work for you:

        //...code as before
        vp->Publisher = ref new String(L"TestPublisher");
        //return m_file->Properties->SavePropertiesAsync();
        vp->SavePropertiesAsync();
    }).then([this](task<void> tvoid)
        //...code as before

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Answer 2

Thanks.  That works.

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SAP