.NET/Java PDF, Tiff, Barcode SDK Library

We have just scratched the surface of I2C expansion. Integrated circuits are available that have real-time clocks, memory, and other interesting functions. You can even use the bus to interconnect with other computers. For example, the LEGO Ultrasonic Sensor has its own processor and communicates through the I2C bus to the NXT. Third-party suppliers provide compasses, accelerometers, and other sophisticated sensors that would be impossible without the functionality available from the I2C bus.

Figure 7-25. The XMLHttpRequest object immediately following object creation (left) and immediately following a successful request (right)

how to put barcode in excel 2007, excel barcode generator freeware, free barcode add in for excel 2013, excel 2007 barcode add in, free barcode font for excel 2003, barcode font excel 2007, excel barcode generator formula, barcode generator excel 2003 free, how to print barcode labels with excel data, create barcode in excel vba,

To set a property at construction time, place the property name inside the constructor followed by an equals sign and then by the value for the property Separate multiple properties with commas The following is a variation on the previous example; it sets the ReadOnly attribute when the object is the constructor:.

#light open SystemIO let filename = "testtxt" let file = if FileExists(filename) then Some(new FileInfo(filename, Attributes = FileAttributesReadOnly)) else None Note that you need to test for the file s existence to avoid a runtime exception when trying to set the Attributes property F# allows you to set type parameters when calling a constructor, because it is not always possible to infer the type parameter of when making a constructor call The type parameters are surrounded by angle brackets (<>) and separated by commas The next example demonstrates how to set a type parameter when calling a constructor You can create an instance of SystemCollectionsGenericList, which can be used only with integers by setting its type parameter when it is created In F# SystemCollectionsGenericList is called ResizeArray to avoid confusion with F# lists.

In this chapter, we ll investigate some examples of the cool things you can do when you combine your NXT with other software, hardware, and the coolest thing of all: yourself.

This example works well for the XMLHttpRequest object, which is well documented, but how about something that s not particularly well documented or the documentation is not easily accessible Consider a table row DOM object. We ve mentioned that all DOM elements have properties such as firstChild, but what else is there You can use Venkman and the Local Variables window to take a look. Figure 7-26 shows the Local Variables window and some of the properties available on a table row object. Did you know that it has properties named offsetHeight, offsetLeft, parentNode, and previousSibling If so, congratulations. If not, now you know and you may be able to put that knowledge to good use later. You may not know the meaning of all these properties, but if you know they exist and know their names, you can perform a Web search to learn more about them.

#light open System let intList = let temp = new ResizeArray<int>() in tempAddRange([| 1 ; 2 ; 3 |]); temp intListForEach( fun i -> ConsoleWriteLine(i) ) The results are as follows: 1 2 3 The previous example also demonstrates another nice feature of F# when interoperating with non-F# libraries NET APIs often use a NET construct called delegates, which are conceptually a kind of function value F# functions will automatically be converted to NET delegate objects if their signatures match You can see this on the last line, where an F# function is passed directly to a method that takes a NET delegate type To keep methods as flexible as possible, you may prefer not to specify a type parameter when importing methods that take generic delegates or perhaps when you re creating a wrapper F# function around constructors for a non-F# library.