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From "Leonel Gayard (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CB-9810) Mismatch between results of resolveLocalFileSystemURL and FileReader, throws error.
Date Thu, 15 Oct 2015 18:17:05 GMT
Leonel Gayard created CB-9810:
---------------------------------

             Summary: Mismatch between results of resolveLocalFileSystemURL and FileReader,
throws error.
                 Key: CB-9810
                 URL: https://issues.apache.org/jira/browse/CB-9810
             Project: Apache Cordova
          Issue Type: Bug
          Components: Plugin File
    Affects Versions: 3.0.0
         Environment: Android SDK 22
Tested on an LG Nexus, Android 5.0.1
            Reporter: Leonel Gayard


h2. The problem

When reading a file with {{resolveLocalFileSystemURL}} followed by {{FileReader.readAsText}},
 the latter fails, with the error message {{Uncaught TypeError: Failed to execute 'readAsText'
on 'FileReader': parameter 1 is not of type 'Blob'.}}

cordova-plugin-file provides these functions, which match the W3C APIs for File and File System:
[resolveLocalFileSystemURL|http://www.w3.org/TR/2011/WD-file-system-api-20110419/#widl-LocalFileSystem-resolveLocalFileSystemURL]
and [FileReader|http://www.w3.org/TR/FileAPI/#APIASynch].

h2. Possible causes ?

It seems the fileEntry object is created inside the Java code, as a JSONObject (method [Filesystem#makeEntryForURL|https://github.com/apache/cordova-plugin-file/blob/r3.0.0/src/android/Filesystem.java#L61];
therefore it does not implement the Javascript interfaces File or Blob.

h2. Possible solution ?

Looking at the source of [FileReader.js|https://github.com/apache/cordova-plugin-file/blob/r3.0.0/www/FileReader.js#L130],
it seems the FileReader implemented by the plugin delegates to the FileReader of the web view
(at least, that's what the name of the variable suggests, `realReader`.

Also, the function in file FileReader.js [seems to rely on the attribute localURL|https://github.com/apache/cordova-plugin-file/blob/r3.0.0/www/FileReader.js#L88]
of the file object, which is not part of the API.

I made a quick hack on my local installation, to remove the call to the "real" FileReader,
and use the one written in Java; this fixed the issue, and makes it possible to use FileReader.

Tested on Android SDK 22, on an LG Nexus, Android 5.0.1.



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