What are some techniques to creating a API of another program?

[iQChange]

Actually, from a site. It plays Flash Videos and I want to create a C API. I must analyze the site structure and somehow get the Flash Download (well, I didn't find any standard API). What should I do to do it easier?
If you are really interested, it's the Brazillian site http://www.superanimes.com.br

[Computergeek01]

What should I do to do it easier?

In this case, the website it self is not the application. The website is just a data source. The application that you would be interfacing would be whatever you are using to grab the data which would most likely your web browser. In that case there is already an API for this kind of stuff.

[iQChange]

I didn't get it at all. What API? Web Browser's API?
Sorry for my ignorance/misunderstanding.

[Computergeek01]

Yes, you'll want to read up on your Web browsers API. For example, Gecko (Mozilla) uses XPCOM: https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM

That one in particular has an extremely steep learning curve, so I encourage you to check out others.

[iQChange]

Funny. It looks like Chromium uses it. Chrome just uses Webkit. Can you point me some directions?

[Computergeek01]

I haven't worked too much with the Chrome Native Client API NaCl (why does nobody call this 'salt'?). I'm really not sure what it's capable of or if it's the correct solution for you.