.NET/Java PDF, Tiff, Barcode SDK Library

Encoding is the process of turning a text string into a sequence of bytes. Conversely, decoding is the process of turning a byte sequence into a text string. The .NET APIs for encoding and decoding represents these sequences as byte arrays. Let s look at the code in Example 10-80 that illustrates this. First, we ll encode some text using the UTF-8 and ASCII encodings, and write the byte values we see to the console.

static void Main(string[] args) { string listenUp = "Listen up!";

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lastError(); If the execution of the query completes without problems, it is time to look at the results Listing 13-4 shows how that is done First a QSqlRecord is retrieved The record represents a row in the results, and you can get the total number of columns using the count method The names of the returned columns are available from the fieldName(int) method With these two methods, a string with the column names is created in the first for loop In the while loop the first results row is requested from the QSqlQuery object by using the next method When a query object returns from a successful exec call, the current row is nothing (that is, NULL) This is indicated as isValid is false When calling next, the next row from the results is returned if available The first time the method is called, the first row is called.

byte[] utf8Bytes = Encoding.UTF8.GetBytes(listenUp); byte[] asciiBytes = Encoding.ASCII.GetBytes(listenUp); Console.WriteLine("UTF-8"); Console.WriteLine("-----"); foreach (var encodedByte in utf8Bytes) { Console.Write(encodedByte); Console.Write(" "); } Console.WriteLine(); Console.WriteLine(); Console.WriteLine("ASCII"); Console.WriteLine("-----"); foreach (var encodedByte in asciiBytes) { Console.Write(encodedByte); Console.Write(" "); } } Console.ReadKey();

Mobile controls: These are for applications that render on portable devices such as personal digital assistants (PDAs) and smart phones The power of server controls is best demonstrated by example Fire up Visual Studio 2005, and create a new ASPNET web site called Atlas2 Drag a calendar from the Standard folder in the Toolbox to the design surface of the Defaultaspx file that was created for you by Visual Studio You should have something that resembles Figure 2-1 If you look at the source for this page, you will see some pretty straightforward HTML, and there isn t a whole lot of it certainly not enough to render the calendar you just saw, much less the interactivity of selecting dates and paging back and forward through the months You can see the code in Figure 2-2..

The framework provides us with the Encoding class. This has a set of static properties that provide us with specific instances of an Encoding object for a particular scheme. In this case, we re using UTF8 and ASCII, which actually return instances of UTF8Encoding and ASCIIEncoding, respectively.

Under normal circumstances, you do not need to know the actual type of these instances; you can just talk to the object returned through its Encoding base class.

When the call tries to move beyond the last available row, the return value is false..

GetBytes returns us the byte array that corresponds to the actual in-memory represen-

tation of a string, encoded using the relevant scheme. If we build and run this code, we see the following output:

UTF-8 ----76 105 115 116 101 110 32 117 112 33 ASCII ----76 105 115 116 101 110 32 117 112 33

Notice that our encodings are identical in this case, just as promised. For basic Latin characters, UTF-8 and ASCII are compatible. (Unlike Notepad, the .NET UTF8Encod ing does not choose to add a BOM by default, so unless you use characters outside the

For each row, the values from the columns are gathered by using the value(int) method The value method returns a QVariant, so it has to be converted into a QString by using the toString method Different columns can be of different values, so it is not necessary to use the toString method The QVariant class has methods for converting the value into most types The most common are toInt, toDouble, toBool, and toString Listing 13-4 Iterating over the column names and the results rows QSqlRecord rec = qryrecord(); int cols = reccount(); QString temp; for( int c=0; c<cols; c++ ) temp += recfieldName(c) + ((c<cols-1) "\t":""); qDebug() << temp; while( qrynext() ) { temp = ""; for( int c=0; c<cols; c++ ) temp += qryvalue(c).

ASCII range this will in fact produce files that can be understood by anything that knows how to process ASCII.) Let s make a quick change to the string we re trying to change, and translate it into French. Replace the first line inside the Main method with Example 10-81. Notice that we ve got a capital E with an acute accent at the beginning.