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Notify When File Change

Vang G.

Hi Dropbox Team,

After I migrated from DB api V1 to V2, I have a problem about sync files. I don't know when the file is changed from Dropbox.

Please help me.

Thanks,

Vang Doan

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Greg-DB

If you're building a server-side app, the best way to know when things change is to use webhooks:

https://www.dropbox.com/developers/reference/webhooks

If you're building a client-side app, the best way to know when things change is to use /2/files/list_folder/longpoll: (or the respective method in whatever SDK/library you're using, if any)

https://www.dropbox.com/developers/documentation/http/documentation#files-list_folder-longpoll

If you're running in to trouble getting the API working with your app, I'll be happy to help with any issues you're having, but I'll need some more information. Please reply with:

- the name and version of the platform and SDK/library you are using, if any
- the full text of any error or output
- the steps to reproduce the issue, including the relevant code snippet(s)

Vang G.

Hi Greg K.,
I tried with
https://www.dropbox.com/developers/documentation/http/documentation#files-list_folder-longpoll, But it work incorrect, I dont know exactly what files change when I delete.

Unlike Api v1.

Please help me

Thanks,
Vang Doan

Vang G.

Hi Greg K.

Im working on iOS platform.

Thanks,
Vang Doan

Greg-DB

The /2/files/list_folder/longpoll endpoint tells you when something has changed in the linked account, but it doesn't tell you exactly what changed. (This is the equivalent of API v1's /1/longpoll_delta.)

You should then call /2/files/list_folder[/continue] to find out what changed. (This is the equivalent of API v1's /1/delta.)

Note that if you're using an SDK, there will be corresponding methods for each of these endpoints.

Vang G.

Hi Greg K.

I tried to use /2/files/list_folder/longpoll (iOS), but It dont work all times. I think the reason is Timeout.

I don't still understand, when finished timeout (follow document the connection will block), I must manual to reconnect to observer again???

Please help me!

Thanks,

Vang Doan

Greg-DB

Hi Vang, can you elaborate on what you mean when you say "It dont work all times"? What error do you get?

And yes, if the call times out or returns changes:false, you should just set up another call and wait again. This way, you just keep one connection open whenever necessary (e.g., only while the app is active) to monitor for changes.