How to get a single photo by ID from Picasa using the google-gdata .net API

I'm trying to use the .net API library to get a single image by ID from Picasa.

So far, I've tried to find the correct call by doing:

new Photo(); but there are no constructor params to tell it which photo to get
new Entry(); same as above
PicasaQuery.CreatePicasaUri; but I have to specify the albumId as well then, which I don't have.

I also can't seem to find the REST call for this in the API documentation (with which I could circumvent the .net API completely).

I've of course Googled this, but either nobody seems to want to get a single image by ID or I am missing the obvious (or this is a crazy scenario...).

Solution

The CreatePicasaUri method has three variations, one of which accepts a photo ID. You're right that you'll need the album ID but you should be able to obtain that.

To get a list of albums and their associated info (note that I use a structure called MyAlbum to store all of the photo info from the album for use later in my code):

        Dim username As String = "default"
        Dim query As AlbumQuery = New AlbumQuery(PicasaQuery.CreatePicasaUri(username))

        Dim feed As PicasaFeed = service.Query(query)
        Dim albums As New List(Of MyAlbum)

        For Each entry As PicasaEntry In feed.Entries

            Dim ac As AlbumAccessor = New AlbumAccessor(entry)
            Dim a As MyAlbum
            a.Name = ac.AlbumTitle
            a.ImageCount = ac.NumPhotos
            a.ID = ac.Id
            albums.Add(a)

        Next

To query based on Photo ID:

Dim query As PhotoQuery = Nothing
query = New PhotoQuery(PicasaQuery.CreatePicasaUri(username, albumID, photoID))