.NET/Java PDF, Tiff, Barcode SDK Library

lthough F# can use all the classes available in the .NET BCL, it also ships with its own set of libraries. The F# libraries are split into two, FSLib.dll, which is also referred to as the native F# library or just FSLib, and MLLib.dll, which is sometimes referred to as the ML compatibility library or MLLib. FSLib contains everything that the F# compiler really needs to work; for example, it contains the Tuple class that is used when you use a tuple. MLLib is a set of libraries for doing common programming tasks partially based on the libraries that ship with OCaml. The objective of this chapter is not to completely document every nuance of every F# library type and function. It is to give you an overview of what the modules can do, with a particular focus on features that aren t readily available in the BCL. The F# online documentation (http://research.microsoft.com/fsharp/manual/namespaces.html) is the place to find detailed documentation about each function. There is some crossover between the functionality provided by the F# libraries and the .NET BCL. Programmers often ask when should they use functions from the F# library and when should they use the classes and methods available in the .NET BCL. Both have their advantages and disadvantages, and a good rule of thumb is to prefer what is in FSLib over the classes available in the .NET Framework BCL and prefer what is available in the .NET Framework BCL over MLLib.

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The following sections list all the modules that are contained in FSLib and MLLib; the modules covered in this chapter are highlighted in bold.

By using responseText and innerHTML together, the server can produce HTML content that is consumed by the browser using the innerHTML property. The following example illustrates search functionality using the XMLHttpRequest object, its responseText property, and the innerHTML property of HTML elements. Clicking the search button initiates a search on the server. The server responds by generating a table of results. The browser processes the response by setting the innerHTML property of a div element to the value of the XMLHttpRequest object s responseText property. Figure 3-1 shows the browser window after the search button has been clicked and the results table has been added to the window content.

Display patterns Each byte represents a column of dots Bit set to 1 means lit LED. Least significant bit is at top of column. Last byte must be all 0 Maximum number of bytes par pattern: 15 L_[] E_[] G_[] O_[] = = = = {0xff, {0xff, {0x7e, {0x7e, 0x80, 0x89, 0x00, 0x00, 0x80, 0x89, 0x81, 0x81, 0x80, 0x89, 0x81, 0x81, 0x80, 0x89, 0x81, 0x81, 0x80, 0x81, 0x81, 0x81, 0x80, 0x81, 0x91, 0x81, 0x80, 0}; 0}; 0x90, 0x72, 0}; 0x00, 0x7e, 0};

These are the modules in FSLib: Microsoft.FSharp Idioms Reflection Microsoft.FSharp.Collections Array ComparisonIdentity LazyList ReadonlyArray Set Microsoft.FSharp.Collections.Tags Optimizations Microsoft.FSharp.Compatibility CompatArray Microsoft.FSharp.Control IEvent Microsoft.FSharp.Core Byte Float Int32 LanguagePrimitives Option UInt16 UInt8 Microsoft.FSharp.Math BigInt Complex LinearAlgebra RawMatrixOps BigNum GlobalAssociations Matrix RowVector BigRational Instances Notation Vector Char Float32 Int64 Operators SByte UInt32 Enum Int16 Int8 OptimizedClosures String UInt64 Lazy LazyStatus CompatMatrix MATLAB Array2 HashIdentity List ResizeArray Array3 IEnumerable Map Seq

Figure 3-1. The browser window showing the search results retrieved using XMLHttpRequest and processed using innerHTML

Microsoft.FSharp.Primitives Basics Microsoft.FSharp.Quotations Raw RawTypes Typed Utilities

byte N_[] = {0xff, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0xff, 0}; byte X_[] = {0x80, 0x41, 0x22, 0x14, 0x08, 0x14, 0x22, 0x41, 0x80, 0}; byte T_[] = {0x01, 0x01, 0x01, 0x01, 0xff, 0x01, 0x01, 0x01, 0x01, 0}; void WaitTouch(void) { // Wait for pressed while(Sensor(Touch)==0); // and release while(Sensor(Touch)==1); return; } void DispLetter (const byte & letter[]) { int nbytes; // Wait for the end of previously sent data while(I2CStatus(I2Cport, nbytes)==STAT_COMM_PENDING); // Write buffer to send to PCF8574 byte WriteBuf[]; ArrayBuild(WriteBuf, I2CAddr8574, letter); for(int i=1; i<ArrayLen(WriteBuf); i++) { WriteBuf[i] ^= 0xff; } I2CWrite(I2Cport, 0, WriteBuf); } task main () { // Configure NXT I2C port SetSensorLowspeed (I2Cport); // Configure Touch sensor SetSensorTouch (Touch); // Start Motor, full power OnFwd(Motor, 100); while (true)

These are the modules in MLLib: Microsoft.FSharp.Compatibility.OCaml Arg Big_int Buffer Bytearray Filename Hashtbl Lexing Num Obj Parsing Pervasives Printexc Sys

The code for this example is similar to the example from 2 that simply displayed the server response in an alert box. The steps are as follows: 1. Clicking the search button calls the startRequest function, which first calls the createXMLHttpRequest function to initialize a new instance of the XMLHttpRequest object. 2. The startRequest function sets the callback function to be the handleStateChange function. 3. The startRequest function continues by using the open() method to set the request s method (GET) and its destination and to perform the request asynchronously. 4. The request is then sent using the send() method of the XMLHttpRequest object. 5. Each time the XMLHttpRequest object s internal state changes, the handleStateChange function is called. Once the response has been received (indicated by the readyState property having a value of 4), the innerHTML property of the div element is set using the responseText property of XMLHttpRequest. Listing 3-1 shows innerHTML.html, and Listing 3-2 shows innerHTML.xml, which represents the content produced by the search.