4.11 - MediaManager.refreshFileList never calls completion on sd cards with thousands of pictures

[Zeraan]

I'm working on an issue in iOS where in some situations, refreshFileList never calls completion, and would constantly return "camera is busy" error when I add a timer to ping the DJIMediaFileListState.

I've noticed that this is a problem most commonly encountered on sd cards that have many images, in range of thousands. Android's version seems to work fine (identical workflow in that I set the camera mode to download, then check the state and if it's incomplete, reset, or unknown, call the refreshFileList) as of 4.11 on both Android and iOS version of DJI SDK.

[dji-dev]

Public comment from Luce Luo in Zendesk ticket #29163:

Dear Zeraan,

Thank you for contacting DJI. To help us collect questions in detail, please fill in the form below and we will handle this ticket once we have received it. https://formcrafts.com/a/dji-developer-feedback-en

Thanks,

Luce Luo DJI Dev Team

[alzin]

Use the following functions to fetch the data from the sd card, please let me know if you need sth else!

func loadMediaList() {

    loadingIndicator.isHidden = false

    if (self.mediaManager?.sdCardFileListState == DJIMediaFileListState.syncing || self.mediaManager?.sdCardFileListState == DJIMediaFileListState.deleting) {
        print("Media Manager is busy. ")
    } else {
        self.mediaManager?.refreshFileList(of: DJICameraStorageLocation.sdCard, withCompletion: { (error) in
            if error != nil {
                print("Fetch media file list failed: ",error?.localizedDescription as Any)
            } else {
                print("Fetch media file list success.")
                let mediaFileList = self.mediaManager?.sdCardFileListSnapshot()
                self.updateMediaList(mediaFileList: mediaFileList!)
                self.loadingIndicator.isHidden = true
            }

        })
    }

}

func updateMediaList(mediaFileList: [DJIMediaFile]) {

    //change the DJIMedia File type to NS Array
    let newNSArray = mediaFileList as NSArray

    self.mediaList?.removeAllObjects()
    //here is a very important step to change from an NSArray NSMutuableArray
    self.mediaList = newNSArray.mutableCopy() as? NSMutableArray

    let taskScheduler = self.fetchCamera()?.mediaManager?.taskScheduler
    taskScheduler?.suspendAfterSingleFetchTaskFailure = false
    taskScheduler?.resume(completion: nil)

    for file in mediaFileList {
        if file.thumbnail == nil {
            let task = DJIFetchMediaTask(file: file, content: DJIFetchMediaTaskContent.preview, andCompletion: { (file, content, error) in
                self.mediaTableView.reloadData()
            })
            taskScheduler?.moveTask(toEnd: task)
        }
    }

}//end of the update func