Ticket Created
over 4 years ago

WERETECH - 10552

makeImageRequest() in sync mode causes Array Out Of Bounds Error

Hi guys,

I’m encountering an error when using Toybox.Communications.makeImageRequest() with wifi / sync mode.

Problem:

When downloading images with makeImageRequest() via wifi in sync mode in a subclass of Communications.SyncDelegate the app tends to crash. Here is the error code (which always gets printed twice):

Error: Array Out Of Bounds Error

Details: failed inside handle_image_callback

Time: 2021-01-27T10:58:37Z

Part-Number: 006-B3226-00

Firmware-Version: '5.10'

Language-Code: deu

ConnectIQ-Version: 3.2.3

Filename: my_file_name

Appname: MyAppName

 

Observations:

  • Everything works fine on simulator. The Problem only occurs on my physical device (Venu)
  • The error can occur with all data types that I tested (png, jpeg, bmp)
  • The error does not occur if I set a color palette in the arguments (only tested with a 4 color palette)
  • The error does not occur if I load f.e. a simple one-color-all-red-image
  • The Image size (pixels) can be higher or lower than maxWidth and maxHeight, the error occurs in both cases
  • The dithering mode makes no difference
  • Some images succeed to be downloaded but get cut of when displayed (2/3 of image are black) and there’s a small multi-color stripe between the correct area and the black. Again only on real device, simulator works fine.
  • Tried it with images from our backend, with images from other websites and with own image from a third-party server: https://i.ibb.co/8rFBZP5/dummy.png
  • Maybe this is related: Although ANIMATIONS can be downloaded and stored with makeWebRequest() they crash when played. Also only on the real device, simulator works fine.

Code:

class MySyncDelegate extends Communications.SyncDelegate {

      function executeImageDownload(imageUrl) {

            var parameters = null;

            var options = {

                    // request works if this is active:

                    //:palette => [ Graphics.COLOR_ORANGE,

                    //          Graphics.COLOR_DK_BLUE,

                    //          Graphics.COLOR_BLUE,

                    //          Graphics.COLOR_BLACK ],

                    :maxWidth => System.getDeviceSettings().screenWidth,

                    :maxHeight => System.getDeviceSettings().screenHeight

                    // Makes no difference:

              //:dithering => Communications.IMAGE_DITHERING_NONE

                };

                Communications.makeImageRequest(imageUrl, parameters, options, method(:saveData));

                    // Aaaand here it crashs. Callback is not getting reached.

     }

}

Example File:

I’ tried to attach one example image but "quota restrictions" forbid it. Here's a link though: https://i.ibb.co/8rFBZP5/dummy.png

Question:

Downloading images (and even more downloading animations) is pretty important for our app. And we have only a venu to test with. Can you tell me if this error occurs on all devices or possibly only on venu?

Kind regards

Laurex