.NET/Java PDF, Tiff, Barcode SDK Library

action to perform once the button is clicked. Naturally, in this case the action to perform will be to move to the previous record. This is implemented on the <itemView> control as the movePrevious method. As such, you can tie an action on the <click> of this button to this method on the <itemView> and declaratively implement navigational functionality that manages the move to the previous record. As you can see, the functionality to move to the next record is similar: <button targetElement="nextButton"> <bindings> <binding dataContext="detailsView" dataPath="canMoveNext" property="enabled"/> </bindings> <click> <invokeMethod target="detailsView" method="moveNext" /> </click> </button> You can render the index of the current record by using the dataIndex property of the connected dataset. You can bind this to a label like this: <label targetElement="rowIndexLabel"> <bindings> <binding dataContext="detailsView" dataPath="dataIndex" property="text" transform="Add" /> </bindings> </label> When it comes to adding a new record to the dataset, you need to use the addItem method that the itemView exposes. This should be called only when the data source is considered ready for adding data. You do this by binding the enablement of the control to the isReady property of the dataSource (not the itemView), and then upon clicking the button, you invoke the addItem method of the itemView to which the data is bound. You do it this way because the readiness of the data to be written to is best established by looking at the dataSource, because it is closer to the data. <button targetElement="addButton"> <bindings> <binding dataContext="dataSource" dataPath="isReady" property="enabled"/> </bindings> <click> <invokeMethod target="detailsView" method="addItem" /> </click> </button>

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string listenUp = " coute-moi!";

If you don t have a French keyboard and you re wondering how to insert that E-acute character, there are a number of ways to do it. If you know the decimal representation of the Unicode code point, you can hold down the Alt key and type the number on the numeric keypad (and then release the Alt key). So Alt-0163 will insert the symbol for the UK currency, , and Alt-0201 produces . This doesn t work for the normal number keys, though, so if you don t have a numeric keypad most laptops don t this isn t much help. Possibly the most fun, though, is to run the charmap.exe application. The program icon for it in the Start menu is buried pretty deeply, so it s easier to type charmap into a command prompt, the Start Run box, or the Windows 7 Start menu search box. This is very instructive, and allows you to explore the various different character sets and (if you check the Advanced view box) encodings. You can see an image of it in Figure 10-2. Alternatively, you could just escape the character the string literal "\u00C9coutez moi" will produce the same result. And this has the advantage of not requiring nonASCII values in your source file. Visual Studio is perfectly able to edit various file encodings, including UTF-8, so you can put non-ASCII characters in strings without having to escape them, and you can even use them in identifiers. But some text-oriented tools are not so flexible, so there may be advantages in keeping your source code purely ASCII. Now, when we run again, we get the following output:

toString() + ((c<cols-1) "\t":""); qDebug() << temp; } In the previous listings, you passed the entire SQL query as an entire string This might work for simple queries, but it might be a problem as soon as you start adding user input to the query For example, if the user supplied the lastname string in Listing 13-3, you would have a problem if the name contained a single quote mark (') It can also be an issue handling floating-point values because the decimal character differs between locales The solution to these problems is to bind the values used in the query in a preparation stage before the query is executed Listing 13-5 shows how this is done for an INSERT query The preparation of a query, which is an optional step, might consist of a syntax check for some databases, while others will fail at execution.

UTF-8 ----195 137 99 111 117 116 101 45 109 111 105 33 ASCII ----63 99 111 117 116 101 45 109 111 105 33

We ve quite clearly not got the same output in each case. The UTF-8 case starts with 195, 137, while the ASCII starts with 63. After this preamble, they re again identical. So, let s try decoding those two byte arrays back into strings, and see what happens. Insert the code in Example 10-82 before the call to Console.ReadKey.

string decodedUtf8 = Encoding.UTF8.GetString(utf8Bytes); string decodedAscii = Encoding.ASCII.GetString(asciiBytes); Console.WriteLine(); Console.WriteLine(); Console.WriteLine("Decoded UTF-8"); Console.WriteLine("-------------"); Console.WriteLine(decodedUtf8); Console.WriteLine(); Console.WriteLine(); Console.WriteLine("Decoded ASCII"); Console.WriteLine("-------------"); Console.WriteLine(decodedAscii);

If the syntax check fails, the prepare call will return false Because you have tested the SQL statement before, you do not have to check for that However, even if the statements have been tested, the exec call can still fail due to problems with the database connection In Listing 13-5, the query is prepared with the prepare method Instead of the actual values, placeholders are placed in the query The placeholders consist of a name prefixed by a colon (:) When the query has been prepared, the bindValue(QString,QVariant) is used to bind a value to each placeholder..