CODEWITHSUNDEEP
androidairflash-builder
ytkang
ytkang

Reputation: 161

how to extract obb file on flash builder?

var zip:FZip = new FZip();
zip.load(new URLRequest("xx.obb"));

this codes does not work. It throws "Unknown record signature:" error.

how did you extract .obb file ?

Upvotes: 1

Views: 6627

Answers (2)

user1911173
user1911173

Reputation: 171

If your obb file is like any other zip file then you can treat it as such. First you will want a list of files to extract (could be all your files who knows).

Here is one way to get the files out :

 private function obbFileUnpackingRoutine(event:Event):void{
    addChild(obbUnpackScreen);
    obbUnpackScreen.obbProgress.scaleX = zipCount/filesToUnpack.length;
    setChildIndex(obbUnpackScreen, numChildren -1);
    for (var i:uint = 0; i<24; i++){
        if (zipCount == filesToUnpack.length){
            zipDone = true;
            removeEventListener(Event.ENTER_FRAME, obbFileUnpackingRoutine);
            removeChild(obbUnpackScreen);
            var fr:FileStream=new FileStream();
            var str:String = File.applicationStorageDirectory.nativePath;
            var cacheDir= new File(str +"/YourSettings");
            fr.open(cacheDir.resolvePath("isObbUnpacked.pnr"),FileMode.WRITE);
            fr.writeObject([zip.getFileCount(),zipCount]);
            fr.close();
            return
        }
        var file:FZipFile = zip.getFileByName(filesToUnpack[zipCount])
        var cacheDir:File= null;
        var str:String = File.applicationStorageDirectory.nativePath;
        cacheDir= new File(str);
        var fileContents = file.content
        var fr:FileStream=new FileStream();
        fr.open(cacheDir.resolvePath(file.filename),FileMode.WRITE);
        fr.writeBytes(fileContents);
        fr.close();
        zipCount++;
    }   


}

If memory permits you may want to load your files directly from the zip file so you don't have to unpack them. Any file that can only accessed with a urlRequest will of course have to be extracted But you can load png files, mp3 files, and your own custom files with byteArrays

My obb file has thousands of tiny mp3 files and it can take upto 3 minutes to extract on an allWinner A10 processor. Direct loading means it can get the files instantly. And there is almost no delay at all.

Upvotes: 0

DiegoF
DiegoF

Reputation: 84

that way you need to read it? if it is to load a game I think it is a good way to load it so it would be better to load it from a specific route

for example: sdcard/android/obb/filename.obb

Upvotes: 0

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