使用C＃SDK将媒体发布到Facebook中的用户/页面墙

Question

I'm using Facebook .Net SDK( http://facebooksdk.net/ ) in my application. I need post an image to the wall of the user or his page.

I have this piece of code to try do this:

var postUrl = "<fbid>/feed";
var fbParameters = new Dictionary<string,object>();
fbParameters["message"] = postRequest.FacebookPostContent;
if (postRequest.MediaData != null && postRequest.MediaData.Length > 0)
{
     var stream = new MemoryStream(postRequest.MediaData);
     if (postRequest.ContentType.Equals("image/jpeg"))
     {
       postUrl = postUrl.Replace("/feed", "/photos");
       fbParameters["picture"] = new FacebookMediaStream { ContentType = postRequest.ContentType, FileName = DateTime.UtcNow.ToString("ddmmyyyyhhmmss") + "-photo.jpeg" }.SetValue(stream);
      }
}
if (!string.IsNullOrWhiteSpace(postRequest.FacebookPageId))
{
      fbUserID = postRequest.FacebookPageId;
}
postUrl = postUrl.Replace("<fbid>", fbUserID);
var result = await facebookClient.PostTaskAsync(postUrl, fbParameters);

Look at my postUrl variable. I update the with the user ID in Facebook or the PageID if it is a page so the post should be properly posted in the right object. If there is some image to upload, so add it to the dictionary.

So, with it in mind, I have the following questions:

1. When the fbUserID is a user ID, the post happens perfectly, with the image and description but, when the ID is a PageID, only the description text is posted and image is just ignored(the user has the manage_page permissions so I dont think it is a permission issue). What I'm doing wrong that the image is not being posted to the page's wall?
2. If I want to post a video instead of a image, what should I change in this code?

Already saw many problems with other technologies here in SO but never a conclusive solution.

Thank you very much for the help, I really appreciate.

Regards, Gutemberg

Answer 1

Got it!

Facebook creates a different section inside the page called Recent Posts by Others on Test Page where people allowed to post images will be there, like an attachment icon. In order to post directly to the page's feed/wall, all I need to do is instead of use the user access_token(even if user granted manage_pages permission) just use the access_token that comes in /me/accounts object for the respective page.

About the video post, I just set the ContentType to " video/mpeg " and at server instead of set picture parameter on dictionary, I've set the video field with the video byte[].

Thanks!

Regards,

Answer 2

As an alternative you could try the Share Content button shown in one of the answers here:

Upload video on Facebook using Graph REST API on Windows Phone 8.1

I found that to be easier than tackling authorization and manually posting.