.NET/ASP.NET/C#/VB.NET PDF Document SDK

The first character is different, because UTF-16 can encode the E-acute correctly; thereafter, every other byte in the UTF-16 array is zero, and the next byte corresponds to the ASCII value. As we said earlier, the Unicode standard is highly compatible with ASCII, and each 16-bit value (i.e., pair of bytes) corresponds to the equivalent 7-bit value in the ASCII encoding. There s one more note to make about this byte array, which has to do with the order of the bytes. This is easier to see if we first update the program to show the values in hex, using the formatting function we learned about earlier, as Example 10-84 shows.

how to print barcodes in excel 2010, free barcode generator add-in for excel, barcode generieren excel freeware, excel 2010 barcode control, excel barcode font add in, excel barcode add in for windows, barcode in excel 2013, barcode add in excel, free barcode inventory software for excel, free barcode generator excel 2010,

static void Main(string[] args) { string listenUpFR = " coute-moi!"; byte[] utf16Bytes = Encoding.Unicode.GetBytes(listenUpFR); Console.WriteLine("UTF-16"); Console.WriteLine("-----"); foreach (var encodedByte in utf16Bytes) { Console.Write(string.Format("{0:X2}", encodedByte)); Console.Write(" "); } } Console.ReadKey();

This will trigger all the bindings and refresh the controls on the screen with new data All this refreshing and updating of controls of course happens asynchronously using Ajax techniques Thus, only the <itemView> will update, and the entire page will not blink <button targetElement="refreshButton"> <bindings>.

If we run again, we now see our bytes written out in hex format:

But remember that each UTF-16 code point is represented by a 16-bit value, so we need to think of each pair of bytes as a character. So, our second character is 63 00. This is the 16-bit hex value 0x0063, represented in the little-endian form. That means we get the least-significant byte (LSB) first, followed by the most-significant byte (MSB). For good (but now largely historical) reasons of engineering efficiency, the Intel x86 family is natively a little-endian architecture. It always expects the LSB followed by the MSB, so the default Unicode encoding is little-endian. On the other hand, platforms like the 680x0 series used in classic Macs are big-endian they expect the MSB, followed by the LSB. Some chip architectures (like the later versions of the ARM chip used in most phones) can even be switched between flavors!

To try using the database classes for real, you will look at an image collection application, which enables you to apply tags to images and then show the images with the selected tags. The images and tags will be stored in an SQLite database. Because the database is contained in a file, it can be considered the file format of the application. The application consists of a simple dialog (see Figure 13-1). The tags are shown on the right, and the number of images with any of the selected tags is shown in the label below the list. The left half is used for showing the current image and for the buttons used for moving between the images, adding images, and adding tags. As you can see from the available buttons the application does not implement a complete CRUD interface. It focuses on the two first parts: Create, as in adding tags and images; and Read, as in showing the images and tags.

Another historical note: one of your authors is big-endian (he used the Z80 and 68000 when he was a baby developer) and the other is little endian (he used the 6502, and early pre-endian-switching versions of the ARM when he was growing up). Consequently, one of us has felt like every memory dump he s looked at since about 1995 has been backwards . The other takes the contrarian position that it s so-called normal numbers that are written backwards. So take a deep breath and count to 01.

Should you need to communicate with something that expects its UTF-16 in a bigendian byte array, you can ask for it. Replace the line in Example 10-84 that initializes the utf16Bytes variable with the code in Example 10-85.

byte[] utf16Bytes = Encoding.BigEndianUnicode.GetBytes(listenUpFR);

Figure 13-1. The Image Book application in action The database used in the application (shown in Figure 13-2) consists of two tables: one for the tags and one for the images (called tags and images, respectively). The images table keeps one image per row. The rows each contain an INTEGER called id that is used to identify each image. The images are stored in a BLOB column called data alongside each id. A BLOB is a binary large object, which pretty much means anything. The application stores the images in PNG format in this column. The tags table consists of an INTEGER column called id and a VARCHAR column called tag. The id column connects the tags to the different images. Notice that there can be several tags for each image.

As you might expect, we get the following output:

static void Main(string[] args) { string listenUpArabic = " ;" byte[] utf16Bytes = Encoding.BigEndianUnicode.GetBytes(listenUpArabic); Console.WriteLine("UTF-16"); Console.WriteLine("-----"); foreach (var encodedByte in utf16Bytes) { Console.Write(string.Format("{0:X2}", encodedByte));