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Mech
 Post subject: Input/Output help
PostPosted: Wed Jul 06, 2011 5:19 pm 
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Joined: Wed Jul 06, 2011 5:14 pm
Posts: 32
Hey guys,

So how does one go about creating these I/O plugins? Im using a cache system which means I store all my files structurally in one file. How would I load my map and not get the "I can't file my tileset images" exception? By this I mean:

Code:
java.lang.RuntimeException: Resource not found: /../img/land.png


Am I able to use those images from an array? I have all my sprites loading to an array.

Thanks for your help, Mech
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Shazer2
 Post subject:
PostPosted: Thu Jul 07, 2011 3:19 am 
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Posts: 18
Have you tried writing the full path?
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Mech
 Post subject:
PostPosted: Thu Jul 07, 2011 7:16 pm 
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Posts: 32
Shazer2 wrote:
Have you tried writing the full path?


Thats just it... There is no path to the images. They are stored in my cache. I was asking if there was a way to use images that are in my sprite array that i've already loaded from the cache.

Thanks for your reply.
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MatthiasM
 Post subject:
PostPosted: Thu Jul 07, 2011 7:41 pm 
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Joined: Fri Jan 29, 2010 7:02 pm
Posts: 1171
When you use URL to references resources you can provide your own URLStreamHandler to resolve them. You can take a look at the TWL Theme Editor sources.

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Mech
 Post subject:
PostPosted: Fri Jul 08, 2011 1:25 am 
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Posts: 32
Is there a way I can load the tileset images later? Instead of the constructor automatically doing so?
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MatthiasM
 Post subject:
PostPosted: Fri Jul 08, 2011 5:46 am 
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I have a library called TWLTiled which has separated model and rendering. It also has a tool to create a minimap. Using libGDX it can be used on Android. And of course all data loading is using URL.
You can check the (simple) demo.

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Mech
 Post subject:
PostPosted: Mon Jul 11, 2011 10:14 pm 
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MatthiasM wrote:
I have a library called TWLTiled which has separated model and rendering. It also has a tool to create a minimap. Using libGDX it can be used on Android. And of course all data loading is using URL.
You can check the (simple) demo.


Okay thanks. I'm looking for a way to load them from my cache... not a URL. As stated above, my cache is like a ZIP archive; storing files within in itself then using GZIP for compression. I can load my sprites, my entity files but I cannot load my Tiled maps because there is no option (i'm guessing) available. I'm doing so without extracting the cache. I noticed the TiledMap has a constructor for an InputStream so I'm using the DataInputStream to read a certain amount of bytes into a ByteArrayInputStream for storage then calling this:

'input' being my DataInputStream and my ZoneMap extends TiledMap and implements TileBasedMap for various pathfinding abilities...
Code:
               byte[] buffer = new byte[(int) length];
               input.readFully(buffer, 0, (int) length);

               ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
               // ZoneMap map = new ZoneMap(bais);

               // Game.getMaps().add(map);


I have them commented out for the obvious reason of them not loading the sprites used for the TileSets.

If I've missed something here or you need me to explain something a little more please don't hesitate to ask me.

Thanks for your help and kindness.
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MatthiasM
 Post subject:
PostPosted: Mon Jul 11, 2011 10:17 pm 
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You can do all that just fine with an URL - just provide your own URLStreamHandler.

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Mech
 Post subject:
PostPosted: Tue Jul 12, 2011 1:09 am 
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Posts: 32
MatthiasM wrote:
You can do all that just fine with an URL - just provide your own URLStreamHandler.


What exactally would I use for a URL in this case?
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MatthiasM
 Post subject:
PostPosted: Tue Jul 12, 2011 6:28 am 
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To allow code to access your "cache file" without the need for it to know about your file format.

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Mech
 Post subject:
PostPosted: Tue Jul 12, 2011 3:54 pm 
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MatthiasM wrote:
To allow code to access your "cache file" without the need for it to know about your file format.


Did I mention that I never extract the cache?
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MatthiasM
 Post subject:
PostPosted: Tue Jul 12, 2011 4:16 pm 
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That would defeat the purpose.

With URL + URLStreamHandler you can create a virtual file system (eg present data / folders etc which don't exist, or file formats normally not supported by the JVM) and let 3rd party code use it.

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Mech
 Post subject:
PostPosted: Tue Jul 12, 2011 5:14 pm 
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Joined: Wed Jul 06, 2011 5:14 pm
Posts: 32
MatthiasM wrote:
That would defeat the purpose.

With URL + URLStreamHandler you can create a virtual file system (eg present data / folders etc which don't exist, or file formats normally not supported by the JVM) and let 3rd party code use it.


Oh okay, I will go and explore the URLStreamHandler docs. Thanks for all your help!
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Mech
 Post subject:
PostPosted: Tue Jul 19, 2011 1:16 am 
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Unfortuneatly, URLStreamHandler will not be an option for this.

My files are structured like this:
Code:
Parent directory as null terminated string
File name as null terminated string
File length as a long
File type as a byte
------------------------------------------------
String name = readString(input);
String parent = readString(input);
long length = input.readLong();
int fileType = input.readByte();


Then I parse them out like this:
Code:
            if (fileType == 0) {
               if (Cache.CURRENT_STATE != 1) {
                  Cache.CURRENT_STATE = 1;
               }

               byte[] buffer = new byte[(int) length];
               input.readFully(buffer, 0, (int) length);

               ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
               Sprite img = new Sprite(bais, name, false);

               Game.getSprites().add(img);
               System.out.println("Added sprite '" + name + "'");
            }


Can you see my issue now?
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