Facebook API添加照片

Question

I need to post a Bitmap to Facebook wall along with a message and url link.

According to https://developers.facebook.com/docs/reference/api/user/#photos , there are 4 parameters to add a photo to Facebook album:

source , message , place , no_story .

However, I was recommend to use a code like this:

Bitmap bm = ...;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(CompressFormat.JPEG, 100, baos);
final byte[] data = baos.toByteArray();
Bundle postParams = new Bundle();

postParams.putByteArray("photo", data);
postParams.putString("message", "My message here");
postParams.putString("link", "http://www.google.com");

Request request = new Request(session, "me/photos", postParams, HttpMethod.POST, callback);
RequestAsyncTask task = new RequestAsyncTask(request);
task.execute();

... and this code works fine except it does not show the link ("http://www.google.com") on the wall.

I have three questions:

1. Why does postParams.putByteArray("photo", data) work? There's no photo parameter according to documentation (see above).

2. If it is impossible to use link parameter, how does SLComposeViewController class (http://developer.apple.com/library/ios/#documentation/NetworkingInternet/Reference/SLComposeViewController_Class/Reference/Reference.html) work? It has - (BOOL)addURL:(NSURL *)url method.

3. If it is possible to use link parameter, why doesn't it work?

Answer 1

Okay, I found answers to questions (2) and (3). It appeared to be very simple: do not use link , just append it to message :

postParams.putByteArray("photo", data);
postParams.putString("message", "My message here" + " " + "http://www.google.com");
//postParams.putString("link", "http://www.google.com");

As for my question (1), it is still unclear for me: why does postParams.putByteArray("photo", data); work fine instead of postParams.putByteArray("source", data); ? The documentation say nothing about photo parameter.