How to use DICOM-rs in WASM?

[st-little]

I want to use DICOM-rs in my WASM project.

# Cargo.toml
[dependencies]
dicom = { version = "0.7.0", default-features = false }

However, I get the following error.

- ⚙️ Compiling registry+https://github.com/rust-lang/crates.io-index#dioxus-html-internal-macro@0.5.0                                                                                                                                                                                                      error[E0583]: file not found for module `sys`
  --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/lib.rs:26:1
   |
26 | mod sys;
   | ^^^^^^^^
   |
   = help: to create the module `sys`, create file "/usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/sys.rs" or "/usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/sys/mod.rs"
   = note: if there is a `mod sys` elsewhere in the crate already, import it with `use crate::...` instead

error[E0425]: cannot find function `with_description` in module `sys`
  --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/lib.rs:47:14
   |
47 |         sys::with_description(*self, |desc| {
   |              ^^^^^^^^^^^^^^^^ not found in `sys`

error[E0425]: cannot find function `with_description` in module `sys`
  --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/lib.rs:58:14
   |
58 |         sys::with_description(*self, |desc| match desc {
   |              ^^^^^^^^^^^^^^^^ not found in `sys`

error[E0425]: cannot find value `STRERROR_NAME` in module `sys`
  --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/lib.rs:64:22
   |
64 |                 sys::STRERROR_NAME,
   |                      ^^^^^^^^^^^^^ not found in `sys`

error[E0425]: cannot find function `errno` in module `sys`
  --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/lib.rs:95:10
   |
95 |     sys::errno()
   |          ^^^^^ not found in `sys`

error[E0425]: cannot find function `set_errno` in module `sys`
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/errno-0.3.8/src/lib.rs:100:10
    |
100 |     sys::set_errno(err)
    |          ^^^^^^^^^ not found in `sys`

Some errors have detailed explanations: E0425, E0583.
For more information about an error, try `rustc --explain E0425`.
error: could not compile `errno` (lib) due to 6 previous errors
Error: 🚫 Building project failed:

Caused by:
    Build failed

Am I using DICOM-rs incorrectly?

[Enet4]

There are not enough details to reproduce the problem. Please clarify what other parts of the project you have, including the source code, the toolchain and target involved, and the steps done to build the project. Those errors do not even seem related to any crate in the DICOM-rs ecosystem.

[st-little]

Sorry, my explanation was insufficient.
My WASM project uses Dioxus.

cargo install dioxus-cli@0.5.4

The steps to create a project are as follows.

$ dx new
✔ 🤷   Which sub-template should be expanded? · Web
🤷   Project Name: sample
✔ 🤷   How do you want to create CSS? · Vanilla
✔ 🤷   Should the application use the Dioxus router? · false

The source code is as follows

[dependencies]

dioxus = { version = "0.5", features = ["web"] }

# Debug
tracing = "0.1.40"
dioxus-logger = "0.5.0"

anyhow = "1.0.82"
base64 = "0.22.1"
dicom = { version = "0.7.0", default-features = false }
serde = "1.0.200"

#![allow(non_snake_case)]

use dioxus::prelude::*;
use tracing::Level;

fn main() {
    // Init logger
    dioxus_logger::init(Level::INFO).expect("failed to init logger");
    launch(App);
}

#[component]
fn App() -> Element {
    // Build cool things ✌️

    rsx! {
        link { rel: "stylesheet", href: "main.css" }
        img { src: "header.svg", id: "header" }
        div { id: "links",
            a { target: "_blank", href: "https://dioxuslabs.com/learn/0.5/", "📚 Learn Dioxus" }
            a { target: "_blank", href: "https://dioxuslabs.com/awesome", "🚀 Awesome Dioxus" }
            a { target: "_blank", href: "https://github.com/dioxus-community/", "📡 Community Libraries" }
            a { target: "_blank", href: "https://github.com/DioxusLabs/dioxus-std", "⚙️ Dioxus Standard Library" }
            a { target: "_blank", href: "https://marketplace.visualstudio.com/items?itemName=DioxusLabs.dioxus", "💫 VSCode Extension" }
            a { target: "_blank", href: "https://discord.gg/XgGxMSkvUM", "👋 Community Discord" }
        }
    }
}

I get an error when I run the build with the following command.

dx build

Perhaps a question for the dioxus community would have been more appropriate...

[Enet4]

OK, I noticed that you are using the parent crate dicom. You may need to pick only the ones that you need, as not all of them are supported in a WASM environment. The crates below should work well:

• dicom-object
• dicom-pixeldata
• dicom-json
• dicom-dictionary-std
• dicom-core
• ...

So basically you need to exclude dicom-ul and dicom-dump.

[st-little]

Thank you for answering.
This error has been resolved.