Exploring Context and Design Overview
Currently, I am utilizing a library known as Tiff.js to seamlessly load Tiff images on a designated webpage. The usage of this library extends both to the server-side and client-side functionalities. On the server end, I leverage the library to create a Tiff object directly sourced from a Tiff file residing on the server itself. Subsequently, I employ ExpressJS to transmit this Tiff object over to the client's end.
Potential Challenge
Brief Synopsis: Issue arises when attempting to execute methods post-object transmission to the client using res.send(object).
Detailed Insight:
Everything operates smoothly while executing methods from the Tiff.js library on the Tiff object within the Node.js server context. Here, successful invocation of specific methods triggers retrieval of essential data regarding the file which is then meticulously logged into the console.https://i.stack.imgur.com/qQUGw.png
Upon transitioning to the client domain, I put AngularJS into play for fetching the Tiff object – a task that seems impeccably executed given my ability to duly log the said object. Nevertheless, upon trying to invoke an essential Tiff.js library method upon this object, a dreaded error swiftly manifests. A quick glimpse at my logs showcases the retrieved Tiff object juxtaposed against a futile attempt to access its width property.
https://i.stack.imgur.com/YjxwQ.png
Awareness Alert: Quality checks have been conducted to affirm precise loading of the Tiff.js file on the client side.
Crafting the Code
Server Controller Section
'use strict';
var fs = require('fs');
var path = require('path');
var Tiff = require('./tiff');
var filename = 'test.oct';
var tiff;
exports.loadOCTFile = function(req, res) {
Tiff.initialize({
TOTAL_MEMORY: 300000000
});
fs.readFile(path.resolve(__dirname, filename), function(err, data) {
if (err) {
throw err;
}
tiff = new Tiff({
buffer: data
});
console.log('width:', tiff.width());
console.log('height:', tiff.height());
console.log('currentDirectory:', tiff.currentDirectory());
console.log('countDirectory:', tiff.countDirectory());
tiff.setDirectory(0);
res.send(tiff);
tiff.close();
});
};
Key Client-Side JS Snippet Embedded Within Angular Controller
$scope.getTest = function() {
$http.get('/oct_analysis_open').success(
function(tiff) {
console.log(tiff);
console.log('width:', tiff.width());
});
};
In case further insights are required, feel free to request for the Express routing specifics.