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request.ServicePoint.Expect100Continue <- false // set the authorisation levels request.Headers.Add("Authorization", "Basic " + user) // set up the stream use reqStream = request.GetRequestStream() reqStream.Write(bytes, 0, bytes.Length) reqStream.Close() postTweet "you" "xxx" "Test tweet from F# interactive" Posting data via HTTP is not too different from retrieving data. The main difference is that, when you create the WebRequest, you have to configure a couple of properties differently, such as when setting the Method, ContentLength, and ContentType properties. You want only the actual user to be able to update his status, so you need to add authentication token to the HTTP headers: // set the authorisation levels request.Headers.Add("Authorization", "Basic " + user) Finally, you need to write the data to the request stream. This is very straightforward; it s just a matter of writing to the data stream: use reqStream = request.GetRequestStream() reqStream.Write(bytes, 0, bytes.Length) reqStream.Close() Perhaps the most interesting aspect of this listing is that you can use it in F# interactive. If you are a twitter fan, you can update your twitter status without having to leave your programming environment.

Let the user know what step is coming next. For example, at the end of one step add a sentence that helps prepare for the next. Give a general overview of where the user is in the wizard (for example, Step 3/5 ). Even better, separate the wizard into logical stages (Choose a Location, Choose Files, Copy Files, and so on), and list these all at the top of the window. Then, highlight the current stage. This is similar to the way Amazon.com guides a visitor through the ordering process.

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The menu-driven model is the most easily recognizable user interface model. It came to popularity with document-based programs like DOS word processors, and then took over nearly every application with the Windows operating system. It s easy to see why: menus represent an attractive compromise, allowing you to prompt users without restricting the way they work. Commands performable in any order. You have the same freedom you have with the command-line interface, and the same ability to use keyboard shortcuts. On-screen prompts. You are never left on your own, and the very grouping of elements can sometimes help you remember what you want to do. For example, if you want to change spacing in Microsoft Word you might not know it has anything to do with paragraphs, but you would be able to decide that the Format menu is probably the best place to start your exploration. Menus are one of the dominant interface elements in Windows programming, and they allow absolutely no room for experimentation or innovation (unless, of course, you re Microsoft, in which case you can roll out a new menu standard with each new version of Office). To create a menu, you copy Microsoft Office as closely as possible, even adding a vestigial File menu when your program has nothing to do with files or documents. Similarly, you would do best to emulate basic options like Edit, View, Window, and even Tools before you start adding menus organized around program-specific concepts. You ll learn more about Microsoft s role in your user interface design a little later in this appendix.

Summary

Shortly after the menu excitement subsided, everyone fell in love with pictures and buttons with the Macintosh OS and Microsoft Windows. The GUI era introduced an avalanche of concepts and user interface elements, several of which are often summarized with the acronym WIMP (windows, icons, mouse, and pointers). One key innovation in the GUI era was the introduction of the mouse, which provides more points of entry for interacting with an application (as in, I want to click here ). Another change was the shift to realistic representation for example, word processors that show a close approximation of how a printed document will look. A central idea in the GUI era was to base user interfaces on real-world metaphors. For example, if you want to delete a file, drag it to an icon that looks like a trash can because that s what you use to dispose of rubbish in the real world.

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