Trouble doing basic loading

[vjau]

Hi, i'm trying this library for the first time and have trouble with basic operations, trying to run this in node.

With this code and provided test dicom

const dcmjs = require("dcmjs");
const fs = require('fs');
fs.readFile('IM-0001-0001.dcm', (err, data)=>{
  let dicomData = dcmjs.data.DicomMessage.readFile(data);
});

I get following error

this.view = new DataView(this.buffer);
                        ^

TypeError: First argument to DataView constructor must be an ArrayBuffer

I am not an expert in node binary handling, but i suppose a node Buffer should be accepted as an ArrayBuffer.

Or is this project only for the browser ?

Thank you.

[pieper]

The code should work fine in node or browser. Try with one of the test datasets and if you still have issues post the full stack trace.

[vjau]

The dicom file used is the one provided in your examples/data folder.

Stacktrace is here

/home/vincent/dev/temp/dcmjs-try/node_modules/dcmjs/build/dcmjs.js:829
            this.view = new DataView(this.buffer);
                        ^

TypeError: First argument to DataView constructor must be an ArrayBuffer
    at new DataView (<anonymous>)
    at new BufferStream (/home/vincent/dev/temp/dcmjs-try/node_modules/dcmjs/build/dcmjs.js:829:18)
    at ReadBufferStream._createSuperInternal (/home/vincent/dev/temp/dcmjs-try/node_modules/dcmjs/build/dcmjs.js:632:25)
    at new ReadBufferStream (/home/vincent/dev/temp/dcmjs-try/node_modules/dcmjs/build/dcmjs.js:1183:21)
    at Function.readFile (/home/vincent/dev/temp/dcmjs-try/node_modules/dcmjs/build/dcmjs.js:3579:21)
    at /home/vincent/dev/temp/dcmjs-try/main.js:4:43
    at FSReqCallback.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:71:3)

I have made a repro here : https://github.com/vjau/dcmjs-try

Node v14.20.0 Ubuntu 20.04

[pieper]

Thanks for making the sample. Did you try changing this line to data.buffer?

https://github.com/vjau/dcmjs-try/blob/1283caae8a16a37bfe5a4cc513297eaa0c3f7e33/main.js#L4

[pieper]

I tested with data.buffer and it appears to work. Can you confirm. I did run into [this issue](https://github.com/dcmjs-org/dcmjs/issues/319}. If you are working on nodejs could you provide a PR to fix that?

[vjau]

It's indeed working replacing data with data.buffer I will look into your issue.