Github user jasongin commented on a diff in the pull request:
https://github.com/apache/cordova-plugin-file/pull/176#discussion_r58441628
--- Diff: README.md ---
@@ -538,3 +540,263 @@ Android also supports a special filesystem named
"documents", which represents a
* `root`: The entire device filesystem
By default, the library and documents directories can be synced to iCloud.
You can also request two additional filesystems, `library-nosync` and
`documents-nosync`, which represent a special non-synced directory within the
`/Library` or `/Documents` filesystem.
+
+## Sample: Create Files and Directories, Write, Read, and Append files ##
+
+The File plugin allows you to do things like store files in a temporary or
persistent storage location for your app (sandboxed storage). The code snippets
in this section demonstrate different tasks including:
+* Accessing the file system
+* Using cross-platform Cordova file URLs to store your files (see _Where
to Store Files_ for more info)
+* Creating files and directories
+* Writing to files
+* Reading files
+* Appending files
+
+## Create a persistent file
+
+Before you can use the File plugin APIs, you must get access to the file
system using `requestFileSystem`. When you do this, you can request either
persistent or temporary storage. Persistent storage will not be removed unless
permission is granted by the user.
+
+When you get file system access, access is granted for the sandboxed file
system only (the sandbox limits access to the app itself), not for general
access to any file system location on the device.
+
+Here is a request for persistent storage.
+
+>*Note* When targeting devices (instead of a browser), you dont need to
use `requestQuota` before using persistent storage.
+
+```
+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);
+```
+
+The success callback receives FileSystem object (fs). Use `fs.root` to
return a DirectoryEntry object, which you can use to create or get a file (by
calling `getFile`). In this example, `fs.root` is a DirectoryEntry object that
represents the persistent storage in the sandboxed file system.
+
+The success callback for `getFile` receives a FileEntry object. You can
use this to perform file write and file read operations.
+
+## Create a temporary file
+
+Here is an example of a request for temporary storage. Temporary storage
may be deleted by the operating system if the device runs low on memory.
+
+```
+window.requestFileSystem(window.TEMPORARY, 5 * 1024 * 1024, function (fs) {
+
+ console.log('file system open: ' + fs.name);
+ createFile(fs.root, "newTempFile.txt");
+
+}, onErrorLoadFs);
+```
+When you are using temporary storage, you can create or get the file by
calling `getFile`. As in the persistent storage example, this will give you a
FileEntry object that you can use for read or write operations.
+
+```
+// Creates a new file or returns the file if it already exists.
+dirEntry.getFile(fileName, {create: true, exclusive: false},
function(fileEntry) {
+
+ writeFile(fileEntry);
+
+}, onErrorCreateFile);
+```
+
+## Write to a file
+
+Once you have a FileEntry object, you can write to the file by calling
`createWriter`, which returns a FileWriter object in the success callback. Call
the `write` method of FileWriter to write to the file.
+
+```
+function writeFile(fileEntry, dataObj) {
+ // Create a FileWriter object for our FileEntry (log.txt).
+ fileEntry.createWriter(function (fileWriter) {
+
+ fileWriter.onwriteend = function (e) {
--- End diff --
Same for a few more non-error callbacks below.
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