[GitHub] [cordova-plugin-file] anshuman61 commented on issue #426: Storage updates in Android 11

[GitBox <gi...@apache.org>]

anshuman61 commented on issue #426:
URL: https://github.com/apache/cordova-plugin-file/issues/426#issuecomment-906139050


   Actually i have the same problem while i upgraded to API 30. I got error code 9 also. As google upgraded its android protocol set for storage we have to use "scoped storage".  
   
   1. In my application i have to capture image, then i have to compress using Javascript image compressors (usually gives better quality than the "`cordova-plugin-camera`" compressors and have more flexibility)  and have to write compressed  files using "`cordova-plugin-file`" to storage.
   
   2. Previously i am using "`LocalFileSystem.PERSISTENT`" and with API 30 i couldn't access that region of my file system due to restrictions imposed.
   
   Example:-
    `window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fs) { 
   console.log('file system open: ' + fs.name);fs.root.getFile("newPersistentFile.txt", { create: true, exclusive: false }, function (fileEntry) {console.log("fileEntry is file?" + fileEntry.isFile.toString());
           // fileEntry.name == 'someFile.txt'
           // fileEntry.fullPath == '/someFile.txt'
           writeFile(fileEntry, null);}, onErrorCreateFile); }, onErrorLoadFs);`
   
   
   
   3. Then i changed  "`LocalFileSystem.PERSISTENT`"  with  "`cordova.file.dataDirectory`" and it worked. Its also logically correct as per the restrictions imposed now a days.  
   
   Example :- 
   
   
    `window.resolveLocalFileSystemURL(cordova.file.dataDirectory, function (dirEntry) {
       console.log('file system open: ' + dirEntry.name);
       var isAppend = true;
       createFile(dirEntry, "fileToAppend.txt", isAppend);
   }, onErrorLoadFs);`
   
   
   
   This example can also be used to create new files, if you provide unique file name each time. Like below.
   
   Example :- 
   
   `
   window.resolveLocalFileSystemURL(cordova.file.dataDirectory, function(fs) {
   createFile(fs, outputfilename);
                           function createFile(dirEntry, fileName, isAppend) {
                               // Creates a new file or returns the file if it already exists (use unique file name each time) .
                               dirEntry.getFile(fileName, { create: true, exclusive: false }, function(fileEntry) {writeFile(fileEntry, result);
                               }, function(err) {
                                   console.log(err);
                               });}function writeFile(fileEntry, dataObj) {
                               // Create a FileWriter object for our FileEntry (log.txt).
                               fileEntry.createWriter(function(fileWriter) {fileWriter.onwriteend = function() {console.log("File written successfully...");console.log(fileEntry); };fileWriter.onerror = function(e) {
                                       console.log("Failed to write file: " + e.toString());
                                   };// If data object is not passed in,
                                   // create a new Blob instead.
                                   if (!dataObj) {
                                       dataObj = new Blob(['some file data'], { type: 'text/plain' });
                                   }fileWriter.write(dataObj);
                               });
                           } }, function(error) { console.log(error); });`
    
   
   Correct me if something i missed. Thank you all. 


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