getFileAsync to crash in installed package (local)

Question

When I launch app by VisualStudio my app work normally.
But after create package and installed it, my app was crashed. I tracing a lot of lines of code and found point before crash:

Windows.Storage.FileIO.readTextAsync(file, encod).done( ...

What is this bug and what may be workaround?

Answer 1

NB!

If .done(null) - working without crash
if .done(function(){}) - crash again

(by VS always working without crash)

Answer 2

I had a similar problem with loadasync.

Sometimes it fails for no obvious reason and hangs the pc.

I found I had to trap out any exceptions and return a value decoding whether the laod was good or caused an exception.

 

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n.Wright

Answer 3

Hi chingachgoog,

I will try it and update you the result later.

Best Regards,

--James

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Answer 4

Hi chingachgoog,

I cannot reproduce the issue you are facing.

I download a sample from MSDN code:File access sample (Windows 8)‎. You could also try this sample, scenario two has the following JavaScript code which include readTextAsync and also .done() method:

function readText() {
        if (SdkSample.sampleFile !== null) {
            Windows.Storage.FileIO.readTextAsync(SdkSample.sampleFile).done(function (fileContent) {
                var outputDiv = document.getElementById("output");
                outputDiv.innerHTML = "The following text was read from '" + SdkSample.sampleFile.name + "':<br /><br />" + fileContent;
            },
            function (error) {
                WinJS.log && WinJS.log(error, "sample", "error");
            });
        }
    }

I create a app package for this sample and install on my PC, run it and I did not see any crash happens.

Could you try to give us a demo for a better support? Or do I misunderstanding something? 

Best Regards,

--James

---

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MSDN Community Support

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Answer 5

Thanks for the replies guys!
I found the cause of my error.

First, I added a function to the error handler for done:

Windows.Storage.FileIO.readTextAsync(file, encod).done(                   function (arg) {... },                    function (err){...})

and got the wrong message about the file's path (now the crash was not!).
Then I checked the path of the file in VS and was very surprised. The path was not correct, but nevertheless worked! (double slash):
"\\pic\description.xml"
When I corrected the way, it worked everywhere.

However strange the way that the error in the output above, led to the collapse of the handler below.

var encod = Windows.Storage.Streams.UnicodeEncoding.utf8        Windows.ApplicationModel.Package.current.installedLocation.getFileAsync(path).then( // real error here!            function (file) {                Windows.Storage.FileIO.readTextAsync(file, encod).done(                   function (arg) {                       // complete                    },                    function (err){                       // mirror of error here!                    }                )            }        )

Tip: add error handlers where you can!