Load files in C++ (Android extension)

#1

I have mentioned this in slack chat before. I am adding a functionality to the hx-lua library to allow using Lua’s luaL_dofile function to load a Lua script file. On desktop it worked fine but on Android seems that the whole application is being compressed in the apk so the C++ code cannot access the file by the given filename. Joshua you have mentioned that I should use some Java API to uncompress the apk like what Lime does. Would you please point me to the source code of such functionality in the Lime library please?

#2

Could you use the ByteArray APIs to load the file into memory, and then pass it into your native script?

#3

The Lua C API provides a function luaL_dofile that accepts a file path as argument. And it will load other Lua files if there are dependencies. So I think loading the file into memory is not a viable option for this specific problem.

Instead, I came across this post telling that I can override the fopen function in C such that the whole thing will work fine in Android environment. But that leads to another problem, how can I get the assetManager object in ExternalInterface.cpp? [Reference (android)] (http://stackoverflow.com/questions/10941802/cant-access-aassetmanager-in-native-code-passed-from-java-in-wallpaperservice)

I would like to know how Lime handle files in android but I cannot find the relevant codes in Github. I appreciate if anyone could point me to the relevant source codes.

Edit: found the code here

Is it possible to link to the cpp file in lime when writing ExternalInterface.cpp?

#4

Maybe you could use luaL_dostring and call it a day? :slight_smile:

#5

var string = Assets.getText (“my.lua”);
my_lua_extension (string);

#6

Inside a .lua file it may refer to other .lua files by require "some/other/module" so eventually it is going to use file path to open files.

So are there no way to link to the cpp files in lime? Seems that if I can link to this file I can get the android asset manager in cpp. https://github.com/openfl/lime/blob/e511c0d2a5d616081a7826416d111aff1d428025/legacy/project/src/android/AndroidCommon.cpp

#7

It would be easier to try and do that by editing the core, rather than doing an external extension