Not able to download OBJ file using GetDerivativeManifest - autodesk-forge

Question

I am trying to download an OBJ file generated from SVF file, using the Autodesk.Forge .NET API method GetDerivativeManifest (C#). The OBJ file has been created successfully. However, the method does not provide a Stream that I can use to retrieve the file and save it locally.
How can I get the OBJ file?

Answer 1

I don't have a C# sample ready to give you, but I hit the same issue with the Node.js SDK. I worked around by implementing the REST call myself:
download (token, urn, derivativeURN, opts = {}) {
// TODO SDK KO
//this._APIAuth.accessToken = token
//
//return this._derivativesAPI.getDerivativeManifest(
// urn,
// derivativeURN,
// opts)
return new Promise((resolve, reject) => {
const url =
`${DerivativeSvc.SERVICE_BASE_URL}/designdata/` +
`${encodeURIComponent(urn)}/manifest/` +
`${encodeURIComponent(derivativeURN)}`
request({
url: url,
method: 'GET',
headers: {
'Authorization': 'Bearer ' + token.access_token
},
encoding: null
}, function(err, response, body) {
try {
if (err) {
return reject(err)
}
if (response && [200, 201, 202].indexOf(
response.statusCode) < 0) {
return reject(response.statusMessage)
}
if (opts.base64) {
resolve(bufferToBase64(body))
} else {
resolve(body)
}
} catch(ex) {
console.log(ex)
reject(ex)
}
})
})
}
Here is how I invoke that method within my endpoint:
/////////////////////////////////////////////////////////
// GET /download
// Download derivative resource
//
/////////////////////////////////////////////////////////
router.get('/download', async (req, res) => {
try {
const filename = req.query.filename || 'download'
const derivativeUrn = req.query.derivativeUrn
// return base64 encoded for thumbnails
const base64 = req.query.base64
const urn = req.query.urn
const forgeSvc = ServiceManager.getService(
'ForgeSvc')
const token = await forgeSvc.get2LeggedToken()
const derivativesSvc = ServiceManager.getService(
'DerivativesSvc')
const response = await derivativesSvc.download(
token, urn, derivativeUrn, {
base64: base64
})
res.set('Content-Type', 'application/octet-stream')
res.set('Content-Disposition',
`attachment filename="${filename}"`)
res.end(response)
} catch (ex) {
res.status(ex.statusCode || 500)
res.json(ex)
}
})
Hope that helps