问题
I have a Facebook application that has a picture gallery. It's build in Flex 4. I want to allow users to link to a specific image.
How can that be done?
The only way I see this being done is adding a GET var like &my_picture=asd.jpg in the Facebook page URL, but I don't know how to read that from the iFrame.
回答1:
Yes, you can add a parameter to the querystring for this:
http://app.facebook.com/yourapp?myparam=1234
Then, your app will be called like this:
http://domainwhereyouhostyourapp.com/your_fb_app/index.php?myparam=1234
Some other parameters are passed by facebook as well, most related to auth tokens, etc. They are prefixed by "fb_" to prevent name clashes.
In your index.php (or whatever you are using), read the get parameter you're interested in and pass them to your swf as usual.
回答2:
What's great also about Facebook is that it carries EVERYTHING after your ../appname/{things-beyond-your-app-name} to you hosted [server] URL... so that even .htaccess can be used. ;)
Like this...
http://apps.facebook.com/YOURAPPNAME/a/b/c.htm
For an app that's hosted on my server at:
http://example.com/APPSHOSTEDPATH/
and by using this one-liner included in my hosted location's .htaccess file in:
http://example.com/APPSHOSTEDPATH/
where .htaccess file contains (among the other standard) lines...
I can put something like:
RewriteRule ^(.*)$ /myRedirectedPath/$1 [L,R=301]
So if the person goes to: http://apps.facebook.com/YOURAPPNAME/a/b/c.htm (as in the above example)
They'll stay there and they'll be accessing:
http://example.com/myRedirectedPath/a/b/c.htm
(pretty sweet, eh?) ;)
Fun stuff... wanted you to know that there's more capability that just $_GET's.
来源：https://stackoverflow.com/questions/3175300/facebook-iframe-application-how-to-pass-data-from-url-query-string