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xamarinmvvmcross

Getting the filename/path from MvvmCross Plugins.DownloadCache

I'm currently using MvvmCross DownloadCache -- and it's working alright -- especially nice when I just need to drop in an Image URL and it automagically downloads / caches the image and serves up a UIImage.

I was hoping to leverage the code for one other use case -- which is I'd like to grab source images from URL's and cache the files on the local file system, but what I really want for this other use case is the image path on the local file system instead of the UIImage itself.

What would help me most if I could get an example of how I might accomplish that. Is it possible to make that happen in a PCL, or does it need to go into the platform specific code?

Solution

  • If you look at the source for the plugin, you'll find https://github.com/MvvmCross/MvvmCross/blob/3.2/Plugins/Cirrious/DownloadCache/Cirrious.MvvmCross.Plugins.DownloadCache/IMvxFileDownloadCache.cs - that will give you a local file path for a cached file:

    public interface IMvxFileDownloadCache 
{ 
     void RequestLocalFilePath(string httpSource, Action<string> success, Action<Exception> error); 
}

    You can get hold of a service implementing this interface using Mvx.Resolve<IMvxFileDownloadCache>()

    To then convert that into a system-wide file path, try NativePath in https://github.com/MvvmCross/MvvmCross/blob/3.2/Plugins/Cirrious/File/Cirrious.MvvmCross.Plugins.File/IMvxFileStore.cs#L27