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Now that you know about the basic components of the Logging Application Block, let s see how to use it within an application. We ll look at standard usage, configuration, and customization.

For the upcoming examples, you need to create and configure an application that will use the Logging Application Block. Follow these steps: 1. Create a new C# Windows project for your application and add the following references to it: System.Configuration Microsoft.Practices.EnterpriseLibrary.Logging.dll Microsoft.Practices.EnterpriseLibrary.Common.dll Microsoft.Practices.EnterpriseLibrary.Logging.Database.dll (used for the FormattedDatabaseTraceListener) 2. In the default Form class, add the following using clauses: using using using using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; Microsoft.Practices.EnterpriseLibrary.Logging; Microsoft.Practices.EnterpriseLibrary.Logging.Filters; System.Diagnostics;

#define OBSTACLE (SensorUS(SONAR)<NEAR)

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// clear the data to read the next line: key = null; buff = new StringBuffer(); } } //--------------------------------------------------------// data methods /** * Get a data string. */ public String getString(String key) { return (String)(myData.get(key)); } /** * Get a data int. */ public int getInt(String key) throws NullPointerException, NumberFormatException { String str = (String)(myData.get(key)); return Integer.parseInt(str); } /** * Get an image. */ public Image getImage(String key) throws NullPointerException, IOException { String str = (String)(myData.get(key)); return Image.createImage(str); } /** * Get a pre-initialized subimage. */ public Image getSubimage(String key) throws NullPointerException, IOException { return (Image)(myData.get(key)); } } The parsing algorithm in Listing 10-1 is fairly standard: read the characters from the properties file stream one by one into a byte array, cutting the strings in response to encountering the separator characters. The reason for using a byte array instead of a StringBuffer is so that you can keep track of the string encoding when converting the data into a Java string object. You don t usually have to worry about the character-encoding scheme when using strings that

3. Add an app.config file (right-click the project, select Add New Item, and then select Application Configuration File from the Add New Item dialog box). 4. Open the Enterprise Library Configuration Console and add the Logging Application Block (using the Action New menu item or the context menu of the app.config file in the Explorer pane). The application block should appear in the Configuration Console as shown in Figure 9-4.

The main task code is shown in Listing 4-2. Listing 4-2. The main Task Code of the AT-ST Program, After Declaring Global Variables // global variables int weightState, legsState, runState; [...] task main () { ATST_init(); int action; while (true) { if(OBSTACLE) runState = 1-2*(Random(2)); // 1, -1 else runState = WALK; switch(runState) { case TURN_RIGHT: TurnRight(9); break; case TURN_LEFT: TurnLeft(9); break; case WALK: GoStraight(); break; } CenterHead(); CenterLegs(); } } Outside every task, function, or subroutine, you see three global variables declared; every function in the program can access these variables. By contrast, a variable declared inside a function (for example the action variable inside the main task) is called local and can be used only by the function inside which it is declared. If any other function tries to use that local variable inside its body, it would cause a compiler error. In fact, the compiler would complain about the presence of an Undefined Identifier action, because it would not know what action is. At the start, the ATST_init() function is called to perform hardware initialization; in this case, to tell the NXT where each sensor is attached and to reset the head and the legs to their zero position. These operations are not trivial, as you will see later. Next, the program enters an infinite loop, as was the case for Quasimodo (see 2). Inside this loop, the whole basic AT-ST behavior is expressed. Let s analyze the code by breaking it into smaller chunks:

Figure 9-4. Newly added Logging Application Block 5. Execute the logging database script. This script is in the LoggingDatabase.sql file, located in the [src]Logging\TraceListeners\Database\Scripts directory of the Enterprise Library installation directory. To execute the script, run the CreateLoggingDb.cmd file. The script will create a database called Logging with three tables: Category, CategoryLog, and Log. It will also create four stored procedures. This database may not fit the needs of all applications, but it gives a starting point for development.

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