Read filename using new setNewGeneratedMediaFileInfoCallback

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Kenneth Argo

• 2022年10月29日 21:32

Using the old setMediaFileCallback I was able to read the saved image's filename, that doesn't appear as part of the information passed when using the new setNewGeneratedMediaFileInfoCallback.

I know I can call refreshFileList on the MediaManager instance but that a lot of overkill to just be able to read the filename, and the call returns a complete list each time, meaning the more photos taken, the larger the list.

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  DJI Developer Support

  • 2022年10月31日 03:20

  The setMediaFileCallback often carries the wrong file name so we use setNewGeneratedMediaFileInfoCallback instead and deprecate the setMediaFileCallback . If you are ok with the setMediaFileCallback then you can still use it. The bug only occurs to some models such as M300RTK.

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  Kenneth Argo

  • 2022年10月31日 04:04

  I'm using the M300RTK.

  So this is a bug in 4.16.2?  What about 5.x?

  How can I use setNewGeneratedMediaFileInfoCallback, and get the filename of a newly added image WITHOUT refreshing the complete image list?

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  DJI Developer Support

  • 2022年10月31日 07:10

  It is not an SDK bug, it is a firmware issue and unfixable. So it will be exist in both 4.x and 5.x version. The theory is we actually cannot get the real fileName, the fileName is created by the SDK according to the naming rules, sometimes it is mismatched with the real file name in SD card.

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  Kenneth Argo

  • 2022年10月31日 08:39

  Is there a way to read the last image filename without refreshing the complete list of all image files? It makes it nearly impossible to do image validation on the most recent image of I must download the complete list each time. It means the more images taken, the larger the list on the callback.

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  DJI Developer Support

  • 2022年10月31日 09:52

  Actually everytime you call refreh it will only refresh the newly generated files not the complete list. Everytime you shoot photos, the fileListState should go into INCOMPLETE state. 

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  Kenneth Argo

  • 2022年11月02日 00:22

  It appears that each call to

  refreshFileListOfStorageLocation(SettingsDefinitions.StorageLocation.SDCARD)

  is returning the complete list.  Unless I misunderstand the documentation and the information in the link you listed above.

  First call:

  ::refreshFileList: djiError: null
  ::sdCardFileListSnapshot
  ::refreshFileList: Size=474, TaskScheduler=IDLE

  Second call: 

  ::refreshFileList: djiError: null
  ::sdCardFileListSnapshot
  ::refreshFileList: Size=476, TaskScheduler=IDLE

  djiCamera!!.setNewGeneratedMediaFileInfoCallback { mediaFileInfo ->

                              // According to DJI, this should return ONLY the new images since the last refresh
                              // TODO:
                              mediaManager?.refreshFileListOfStorageLocation(SettingsDefinitions.StorageLocation.SDCARD) { djiError ->

                                  logInfo("AircraftDataSourceImpl::refreshFileList: djiError: $djiError")

                                  if (djiError == null) {

                                      logInfo("AircraftDataSourceImpl::sdCardFileListSnapshot")

                                      mediaManager?.sdCardFileListSnapshot?.let { djiMedias ->

                                          logInfo(
                                              "AircraftDataSourceImpl::refreshFileList: Size=${djiMedias.size}, TaskScheduler=${fetchMediaTaskScheduler?.state}"
                                          )

   

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  DJI Developer Support

  • 2022年11月02日 02:58

  refreshFileList will return a complate list, it will only fetch the newly generated file and apend to the list. It will not fetch the whole list.

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