coil-kt/coil

Compose Multiplatform Resources loaded with Res.getUri don't work on Windows

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#2833 opened on Feb 9, 2025

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 (6 comments) (5 reactions) (0 assignees)Kotlin (11,779 stars) (757 forks)batch import
help wanted

Description

Discussed in https://github.com/coil-kt/coil/discussions/2824

Originally posted by nevrozza February 1, 2025 Hi! I program on a macbook, but now I've built a project for windows and now I don't have icons/images... (On other platforms (macOS, iOS, Android, WASM, JS) everything is OK).

/*"jar:file:/Users/nevrozq/Code/PansionApp/common/utils-compose/build/libs/utils-compose-jvm.jar!/composeResources/pansion/drawable/icons/screwdriver-wrench-solid.svg"*/
val uri = Res.getUri("drawable/icons/${path}")
AsyncImage(
    ImageRequest.Builder(LocalPlatformContext.current)
        .data(uri)
        .build(),
        // other params
)

Throws:

java.lang.IllegalStateException: Unable to create a fetcher that supports: jar:file:/C:/Users/harla/OneDrive/Desktop/PansionApp/composeApp/build/compose/binaries/main-release/app/PansionApp/app/utils-compose-jvm-441ba4d5932399cabbfe401536893dcf.jar!/composeResources/pansion/drawable/icons/trophy-solid.svg

I guess the problem is that the project is multi-module and Res.getUri("drawable/icons/${path}") returns svg from a jar file. However, it still works on other platforms

Very important: If I use url link from internet or put path to picture (not in jar) it works...

So... There is a crutch solution! Make a separate Windows-only folder with resources and transfer it simply as a string uri = "resources\\drawable\\icons\\${path}"...... But I still believe there is a better solution.

Thanks!

Contributor guide

Tech stack
kotlin
Domain
desktopfrontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
KotlinCompose Multiplatform resourcesWindows file system
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate how Res.getUri constructs URIs on different platforms, especially Windows. The error shows a malformed jar URI with a drive letter (e.g., 'jar:file:/C:/...'), which is invalid. Check the compose resources library's URI handling for Windows paths. Look at coil's fetcher for jar resources, specifically how it handles URIs. The discussion in #2824 may provide additional clues.