Leonel Gayard created CB-9810:
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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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