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  1. #1
    Registered User
    Join Date
    Mar 2014
    Posts
    5

    CustomFilter C# NullReferenceException

    Hello,

    I searched the forum for a similar post and found this: http://developer.nokia.com/community...t=customfilter but it doesn't help in answering my question. When I call RenderAsync() when using my CustomFilter, a NullReferenceException is thrown, which I need to catch and keep calling RenderAsync() until it finally works. Any ideas why? My code is really simple:

    Code:
    using (var source = new BufferImageSource(imgToProcess.data.AsBuffer()))
    using (var effect = new FilterEffect(new MyCustomFilter(source)))
    using (var renderer = new JpegRenderer(effect))
    {
        IBuffer buf = await renderer.RenderAsync();
    }
    for my custom filter, I just overrwrote OnProcess() and that's it. I have a try-catch statement in there, but the exception does not happen there. Any ideas? If I use a new FilterEffect(source) everything works just fine. It seems to be an issue with CustomFilter itself? Thank you for any help!

  2. #2
    Nokia Developer Moderator
    Join Date
    Feb 2006
    Location
    Oslo, Norway
    Posts
    28,752

    Re: CustomFilter C# NullReferenceException

    If you have time, you may try running the same piece of code, with the example filter from http://developer.nokia.com/resources..._CustomFilters.

  3. #3
    Nokia Developer Champion
    Join Date
    Nov 2011
    Location
    la bouexiere, france
    Posts
    475

    Re: CustomFilter C# NullReferenceException

    why do you create a filtereffect?
    What is the MyCustomFilter parent?
    Windows 8, Windows phone 8 or Nokia Asha developer? Go to DVLUP

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