# appenv App paths, packaged assets and installed identity for C+ mobile and desktop applications. ```toml [dependencies] stdlib = "*" appenv = "*" ``` ```cplus import "appenv/appenv" as appenv; import "stdlib/result" as result; import "stdlib/io" as io; fn show_data_dir() { // iOS and Android already scope this directory to the current app. match appenv::data_dir() { result::Result::Ok(dir) => { io::println(dir.view()); } result::Result::Err(e) => { io::eprintln("App storage is unavailable"); } } } ``` Provides app directories, packaged asset readers (`read_asset`, `read_asset_text`, `asset_path`) and ID/name/version/build. Paths return `Result[Text, Error]`; optional metadata returns `Option[Text]`. On desktop, supply `namespace: "com.example.app"` for storage when no native app ID is available. Getters leave CWD unchanged and don't create custom folders. [Tutorial](https://github.com/netdur/cplus/blob/v0.0.30/vendor/appenv/docs/tutorial.md) · [Guide](https://github.com/netdur/cplus/blob/v0.0.30/vendor/appenv/docs/guide.md) · [Reference](https://github.com/netdur/cplus/blob/v0.0.30/vendor/appenv/docs/ref.md) Unit tests are in `src/`, discovered through `src/test_main.cplus`: `cd vendor/appenv && cpc test --filter appenv_`. `tests/run_native.py` checks consuming apps, resources, Unicode, file I/O and API privacy: `python3 vendor/appenv/tests/run_native.py host` (or `ios` / `android`). iOS needs Xcode and a booted simulator; Android needs an ARM64 emulator/device, SDK, NDK and JDK. Set `CPC` to override the compiler path. Append `--asan` to the host command for AddressSanitizer. Desktop source checks and compiled documentation examples: `python3 vendor/appenv/tests/run_source_checks.py`. These source checks do not replace native Windows/Linux testing; when Homebrew GLib is available, the runner also exercises the real GApplication metadata API.