filecache

filecache

• Furty

  Now I moved the file out of the aca and I am trying to load it like this:

  -------------------------------------------------------------------

  function loadFragen() {
  
    var disc_filename = new String(file:///dvddisc/ADV_OBJ/questions.txt);
    var fc_filename = new String(file:///filecache/questions.txt);

    var cbfnPreload = function(errorInfo) {
      if (errorInfo == FileIO.SUCCEEDED) {
      //ok
      }else{
        dbgOut("Errno: " + errorInfo);
      }
    };
    FileIO.copy(disc_filename, fc_filename, true, cbfnPreload); 
  
    var cbfnLoadQuestions = function(textStream, errorInfo) {
      dbgOut(String(errorInfo));
      if (errorInfo == FileIO.SUCCEEDED) {
        //do something    
      }else{
        dbgOut("Errno: " + errorInfo );
      }
    };
    FileIO.openTextFile(fc_filename, FileIO.FILE_IOMODE_READ, false, false, cbfnLoadQuestions);
  
  }

  -----------------------------------------------------------------------------

  This doesn't work in iHDSim. I think I am still doing something wrong but can't see what ;)

  edit: Sometimes I am getting error 3 (FILE_NOT_FOUND) and sometimes error 7 (ARGUMENT). I can't figure out the reason for what it is giving the varying errors.

  
  

• Larry Surat

  Most of the APIs and Markup elements that allow you to reference resources (such as images, sound files, other Markup files, etc.) require that those resources be present in the "File Cache" before they are used. The File Cache is divided into two areas:

  • API Managed Area (AMA): This corresponds to URIs of the form file:///filecache/resourceFile.png. Files can be copied to this location at runtime using FileIO.copy(). After this, you can use the resource with any APIs or Markup elements that operate on resources in the file cache. An example would be modifying and displaying a new markup page (callbacks removed for simplicity)

  var markupDoc = XMLParser.parse(file:///dvddisc/ADV_OBJ/templateMarkup.xmu, callback); // load initial markup document

  // modify markupDoc using XML APIs

  XMLParser.write(markupDoc, file:///filecache/realMarkup.xmu, XMLParser.UTF8, callback); // write markup file to file cache location so link() can use it

  application.link(file:///filecache/realMarkup.xmu);

  • Resource Cache: This corresponds to resources that are referenced as ApplicationResource, TitleResource, and PlaylistApplicationResource elements in the Playlist file. Anything that is referenced in this way can be used by APIs that operate on resources in the File Cache. So in the above example, if you wanted to use templateMarkup.xmu directly from disc, you could:
  • Reference file:///dvddisc/ADV_OBJ/templateMarkup.xmu as an ApplicationResource in your Playlist and a Resource in the manifest of the app that will use the resource
  • call application.link(file:///dvddisc/ADV_OBJ/templateMarkup.xmu); in script. Conversely, if you didn't reference it in this way, you would get an exception from the link() function because it can only load a markup file that is in the File Cache.

  One more thing to keep in mind in the above example: it assumes that any images the markup files are using are also already in the File Cache. You would also need to copy them into a file:///filecache uri or reference them in your playlist in order for the link() to succeed.

  
  
  

• dragoncells

  My recommendation is to keep the ACA file and reference it as a resource in the playlist (ApplicationResource for instance). Also, reference it as a resource in your manifest to prevent the application from executing until the resource is loaded in the file cache. Once you do this, you should be able to use the URI to the file within the ACA w/o doing any FileIO copy magic.
  
  

• CollegeSeniorProjectNeedsHelp

  The reason why I want to copy it is because I am planning to update this text file via network and save it to persistant storage. At the start of the application it should look which version (ps, disc, network) is the newest and copy it to filecache. All following code should not have to care about where the file is from. It should just use the file:///filecache/... uri.
  

• Tom Frey

  The problem here is that you are copying the file and then trying to open it as a text file immediately... but it might not be copied yet. You need to delay your openTextFile until your callback from copy has returned.

  Is there a reason why you're trying to copy this stuff rather than just load it as an application resource Note that if video is playing off the disc, you will fail with an INVALIDOPERATION anyway, since you can't copy files while playing video (the laser would have to jump).

  Just put the original URI (file:///dvddisc/ADV_OBJ/question.txt) into your playlist and manifest. Then in your script you reference it by the same URI and it will magically be found in filecache automatically. Basically everytime you ask for something in script, it checks if there is already a copy in filecache before going to fetch it from the disc / persistent storage / network.

  
  
  

• Thales Medeiros

  so when I want to play a wav out of an aca I tried it like this:

  var cbfnPreload = function(errorInfo) {
  if (errorInfo == FileIO.SUCCEEDED) {
  dbgOut("copied!");
  }else{
  dbgOut("Error copying File: Errno " + errorInfo);
  }
  };

  Application.FileIO.copy("file:///dvddisc/ADV_OBJ/wer_wird_mrd.aca/wav_frage_RICHTIG.wav", "file:///filecache/wav_frage_RICHTIG.wav", true, cbfnPreload);

  Unfortunately I get an Error number 3 (File not found). I checked it often the soundfile is definitively existing in the aca and the aca is named actually like this. Are there any additional things to consider when using aca files

  
  

• chaza

  Generally you don't need to use the FileIO routines to copy data from the disc -- especially during playback!

  As long as the ACA is listed in the playlist file and the manifest as a resource to load, it will be loaded automatically into filecache. Then you refer to it with its original filename (eg, dvddisc/ADV_OBJ/ etc) and the player will know to use the copy in filecache.

  Also, up until recently you were not allowed to copy files OUT of an ACA, but this has been clarified in a recent spec update. I don't think the version of iHDSim you have incorporates this new feature yet, which is why you would get the File Not Found. Even then, you might have to copy the whole ACA to filecache first and then extract individual files (I can't remember off the top of my head)

  
  
  

• MarcGBeauchamp

  So have you specified that the file should be copied into the filecache already by listing it in the playlist and manifest

  If the file has already been copied to filecache from the disc, then when you try to copy from dvddisc to filecache it will get the alread-cached version and copy it to the API managed area.

  The problem is still the timing issue -- you can't parse the file until your callback indicates that it has been copied correctly.

  
  
  
• filecache