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

val phrase : string ref This syntax is similar to defining a union type s constructors, also shown in the previous chapter. The ref type has two built-in operators to access it; the exclamation point (!) provides access to the value of the reference type, and an operator composed of a colon followed by an equals sign (:=) provides for updating it. The ! operator always returns a value of the type of the contents of the ref type, known to the compiler thanks to type parameterization. The := operator has type unit, because it doesn t return anything. The next example shows how to use a ref type to total the contents of an array. On the third line of totalArray, you see the creation of the ref type. In this case, it is initialized to hold the value 0. On the fifth line, you see the ref type being both accessed and updated. First, ! is used to access the value with the ref type; then, after it has been added to the current value held in the array, the value of the ref type is updated through the use of the := operator. Now the code will correctly print 6 to the console. #light let totalArray () = let a = [| 1; 2; 3 |] let x = ref 0 for n in a do x := !x + n print_int !x print_newline() totalArray() The result is as follows: 6

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There are really two programs shown in Figure 13-26. Running the first will sequence the values 5, 9, 10, and 6 repeatedly 400 times for a total of 1,600 steps. The slider will move almost the entire length of the carriage to the right. The second program produces the sequence in reverse order and will cause the slider to return exactly back to the starting position.

I Caution If you are used to programming in one of the C family of programming languages, you should be careful here. When reading F# code, it is quite easy to misinterpret the ref type s ! operator as a Boolean not operator. F# uses a function called not for Boolean not operations.

Figure 7-15. Reloading a page with a future breakpoint set will cause the future breakpoint to be encountered and execution of the script to be suspended.

Another useful I2C integrated circuit is the PCF8591 8-bit analog-to-digital (A/D) converter. It has four channels of analog input and a single channel of analog output. You can see the basic functionality of the part in Figure 13-27. The 8-bit A/D is made by comparing the output of the digital-to-analog (D/A) converter to the selected analog input. A process called successive approximation determines the correct value in just eight clock cycles. The digital results range from 0 to 255, and if you multiply the result by 4, it will look like the Raw values from the NXT A/D.

To allow the web service to be found by the web server, you need to create an .asmx file. An example .asmx file is as follows; the most important thing for you is to set the Class attribute to the name of the class that is your service. When the server receives a request for this file, it invokes the appropriate service. <%@ WebService Class="Strangelights.WebServices.Service" %> If you re running the service locally, you can test the service by simply opening it in a browser. In a browser, you ll see the interface shown in Figure 10-3, which allows you to give values for the web service s parameters and then invoke the service.

Venkman provides a window that lists all the currently set breakpoints. This can come in handy when you re debugging a page that has multiple breakpoints set in multiple files. For example, you may be debugging an HTML page that contains embedded JavaScript written especially for that page, an included JavaScript file that represents a library of JavaScript functions maintained by your organization, and an included JavaScript file that is provided by a third-party vendor or opensource project. Each file in which a breakpoint is set is listed in the Breakpoints window, and listed under each file are all that file s breakpoints, as shown in Figure 7-16.

Each PCF8591 has three address pins that allow you to connect up to eight PCF8591s on a single I2C bus. With all address lines tied to VSS, the base address is 144 decimal (hexadecimal 90), and you can use Figure 13-28 to derive the other address values. Unlike the PCF8574, there is no A series version with an alternate base address.