Github user riknoll commented on a diff in the pull request:
https://github.com/apache/cordova-plugin-file-transfer/pull/136#discussion_r58279713
--- Diff: README.md ---
@@ -315,3 +315,237 @@ If you are upgrading to a new (1.0.0 or newer)
version of File, and you have pre
cdvfile://localhost/persistent/path/to/file
which can be used in place of the absolute file path in both `download()`
and `upload()` methods.
+
+## Sample: Download and Upload Files
+
+Use the File-Transfer plugin to upload and download files. In these
examples, we demonstrate several tasks like:
+
+* Downloading a binary file to the application cache
+* Uploading a file created in your application's root
+* Downloading the uploaded file
+
+## Download a Binary File to the application cache
+
+Use the File plugin with the File-Transfer plugin to provide a target for
the files that you download (the target must be a FileEntry object). Before you
download the file, create a DirectoryEntry object using
`resolveLocalFileSystemURL`, passing in a Cordova file URL like
`cordova.file.cacheDirectory`. Use the `getFile` method of DirectoryEntry to
create the target file.
+
+```
+window.requestFileSystem(window.TEMPORARY, 5 * 1024 * 1024, function (fs) {
+
+ console.log('file system open: ' + fs.name);
+ // Return a DirectoryEntry using Cordova file URLs.
+ window.resolveLocalFileSystemURL(cordova.file.cacheDirectory, function
(dirEntry) {
+
+ // Make sure you add the domain name to the
Content-Security-Policy <meta> element.
+ var url = 'http://cordova.apache.org/static/img/cordova_bot.png';
+ var fileName = 'downloaded-image.png';
+
+ dirEntry.getFile(fileName, { create: true, exclusive: false },
function (fileEntry) {
+ download(fileEntry, url);
+
+ }, onErrorCreateFile);
+
+ }, onErrorResolveUrl);
+
+}, onErrorLoadFs);
+```
+
+>*Note* For persistent storage, use cordova.file.dataDirectory and pass
LocalFileSystem.PERSISTENT to requestFileSystem.
+
+When you have the FileEntry object, download the file using the `download`
method of the FileTransfer object. The 3rd argument to the function is the
success handler, which you can use to call the app's readBinaryFile function.
In this code example, the `entry` variable is a new FileEntry object that
receives the result of the download operation.
+
+```
+function download(fileEntry, uri) {
+
+ var fileTransfer = new FileTransfer();
+ var fileURL = fileEntry.toURL();
+
+ fileTransfer.download(
+ uri,
+ fileURL,
+ function (entry) {
+ console.log("download complete: " + entry.toURL());
+ readBinaryFile(entry);
+ },
+ function (error) {
+ console.log("download error source " + error.source);
+ console.log("download error target " + error.target);
+ console.log("upload error code" + error.code);
+ },
+ null, // or, pass false
+ {
+ //headers: {
+ // "Authorization": "Basic
dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
+ //}
+ }
+ );
+}
+```
+
+To support operations with binary files, FileReader supports two methods,
`readAsBinaryString` and `readAsArrayBuffer`. In this example, use
readAsArrayBuffer and pass the FileEntry object to the method. Once you read
the file successfully, construct a Blob object using the result of the read.
--- End diff --
The second readAsArrayBuffer isn't in an inline code block
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