ASP.NET PDF Viewer using C#, VB/NET

The Windows API provides many hundreds of functions that can do everything from printing, to changing the desktop wallpaper, to creating elaborate windows. In theory, you could even put together an entire Windows program using the raw Windows API functions, although this would be a major undertaking. For more information about the Windows API, a good place is to start is the Wikipedia entry for it at http://en.wikipedia. org/wiki/Windows_API.

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There is a built-in function called help, which can be quite useful. If you use it in the interactive interpreter, you can get information about a function, including its docstring: >>> help(square) Help on function square in module __main__: square(x) Calculates the square of the number x. You meet the help function again in 10.

Although the Windows API allows you to access low-level functions of the Microsoft Windows operating system, it can also be useful to access functions made available by programs available on the system. The technology that makes this possible is called Windows Automation. Windows Automation provides a way for programs to trigger one another s features and to automate certain functions among themselves.

FIGURE 9-14 Using Microsoft Office Live Meeting to present the Point A slide with text boxes added.

Access to Windows Automation is provided by Ruby s WIN32OLE (also included in the standard library). If you re already familiar with Windows Automation, COM, or OLE technologies, Ruby s interface will feel instantly familiar. Even if you re not, this code should be immediately understood:

require 'win32ole' web_browser = WIN32OLE.new('InternetExplorer.Application') web_browser.visible = true web_browser.navigate('http://www.rubyinside.com/')

Functions, in the mathematical sense, always return something that is calculated from their parameters. In Python, some functions don t return anything. In other languages (such as Pascal), such functions may be called other things (such as procedures), but in Python a function is a function, even if it technically isn t. Functions that don t return anything simply don t have a return statement. Or, if they do have return statements, there is no value after the word return:

This code loads the WIN32OLE library and creates a variable, web_browser, that references an OLE automation server called 'InternetExplorer.Application'. This server is provided by the Internet Explorer Web browser that comes with Windows, and the OLE automation server allows you to control the browser s functions remotely. In this example, you make the Web browser visible before instructing it to load up a certain Web page. WIN32OLE does not implement the visible and navigate methods itself. These dynamic methods are handled on the fly by method_missing (a special method that is run within a class whenever no predefined method is found) and passed to the OLE Automation server. Therefore, you can use any methods made available by any OLE Automation server directly from Ruby! You can extend this example to take advantage of further methods made available by Internet Explorer:

BBP works particularly well in online meeting environments because it counters the lack of in-person dynamics with its visually engaging style. You will also make full use of the built-in tools to prompt engagement and involvement because you know exactly where you will use them for example, on the Point A and Point B slides as well as the Key Point slides.

require 'win32ole' web_browser = WIN32OLE.new('InternetExplorer.Application') web_browser.visible = true web_browser.navigate('http://www.rubyinside.com/') while web_browser.ReadyState != 4 sleep 1 end puts "Page is loaded"

This example uses the ReadyState property to determine when Internet Explorer has successfully finished loading the page. If the page is not yet loaded, Ruby sleeps for a second and checks again. This allows you to wait until a remote operation is complete before continuing.