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

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When run with no command-line arguments or faulty command-line arguments, the program will output this: Arg module demo -set: Sets the value my_flag -clear: Clears the value my_flag -str_val <string>: Sets the value my_string -int_val <int>: Sets the value my_int -float_val <float>: Sets the value my_float --help: display this list of options -help: display this list of options When run with the command line args.exe -clear -str_val "hello world" -int_val 10 -float_val 3.14 "file1" "file2" "file3", the program will output the following: myFlag: false myString: hello world myInt: 10 myFloat: 3.140000 myStringList: ["file3"; "file2"; "file1"] The Arg module is an excellent example of how creating a little language can make programming tasks easier and quicker and the resulting code easier to understand and more maintainable. You ll find more details on this style of programming in 11.

Figure 5-27. Examples of CdS photoresistors or Light Dependent Resistors (LDRs)

Summary

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The easiest way to build your own Light Sensor is to purchase an assortment of five LDRs from Radio Shack (276-1657). If there are several packages in the store to pick from, get an assortment that has at least two that look exactly the same. This pair will come in handy for projects that need equally matched sensors. The other approach is to buy some specific LDRs; then you know exactly what you re going to get. The Selco Products plastic-coated type 8P LDRs are ideal LDRs for the NXT, in particular the model 8001 (Digi-Key PDV-P8001-ND). These LDRs have a low cell resistance in bright light, and the 5.08mm diameter is also compatible with the Technic hole size for easy mounting. Start by stripping the connecting wires and clipping the leads of the LDR to about 3/16 inch (4mm). Make sure that you slide some heat shrink tubing over the wires before you solder the connections, as shown in Figure 5-28.

I covered a lot ground in this chapter, since the F# libraries have a diverse range of functionalities. First you looked through the FSLib.dll library with its useful Collections, Reflection, and Math modules. Then you looked at MLLib.dll, which provides functions that are excellent building blocks for all applications. Its Seq module is something that any nontrivial F# program will not be able to do without. The next three chapters will look at how you can use F# with various .NET APIs for common programming tasks. You ll start with a look at implementing user interfaces in 8, and then you ll move to data access in 9 and distributed applications in 10.

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n this chapter, you will look at one of the most common tasks a programmer needs to perform the art of putting pixels on the screen. In F# this is all about the libraries and API that you call, and you have a lot of choices in this area. You can create WinForms, a set of classes found in System.Windows.Form.dll. These classes allow you to create desktop applications based on forms and controls. You can create ASP.NET applications. This library is contained in System.Web.dll, which is a simple way to create server-based dynamic HTML applications. You also have the option to use Windows Presentation Foundation (WPF), which is a new library distributed with .NET 3.0 that allows you to design interfaces in an XML-based language called XAML. These three technologies (WinForms, ASP .NET, and WPF) will be the focus of this chapter. Since whole books have been written on each topic, I won t be able to cover them all in detail. Instead, you ll look at techniques for working with these technologies in F#. F# can also use a lot of other graphics libraries some designed to work with the technologies already mentioned and others, such as the DirectX or GTK# libraries, designed to replace them.

Figure 5-28. Homebrew Light Sensor step 1 Twist the wires around the LDR leads and solder them to look like Figure 5-29.