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The function appears correct at first sight. However, it works only for strings with an odd number of characters and strings with an even length that are not palindromes. In particular, the program raises an exception with the "abba" string as input. We ll show how to use the Visual Studio debugger to figure out the problem with this simple function. The algorithm recursively tests the characters of the string pair-wise at the beginning and at the end of the string because a string is a palindrome if the first and last characters are equal and the substring obtained by removing them is a palindrome too. The s and e variables define the boundaries of the string to be tested and initially refer to the first and last characters of the input string. Recursion terminates when the outermost characters of the string to be tested differ or when you have tested the whole string and the indexes collide. Figure 18-1 shows the debugging session of the simple program. You set a breakpoint at the instruction that prints the result of the isPalindrome function for the "abba" string by clicking where the red circle is shown, which indicates the location of the breakpoint. When the program is started in debug mode, its execution stops at the breakpoint, and you can step through the statements. The current instruction is indicated by the yellow arrow, and the current statement is highlighted, as shown in Figure 18-1.

--- Dumping data for table `expert_mysql`.`staff` --

You use two PInvoke declarations to import functions from the ole.dll COM library where the ROT is defined. After you get a reference to the table, you perform an enumeration of its elements, retrieving the display name and looking for any Visual Studio DTE with a specific PID at its end. The GetObject method is used to finally connect to the desired interface. This example shows the flexible control .NET and F# can provide over COM infrastructure. The ability to access specific COM object instances is widely used on the server side to implement services made available through web pages.

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Figure 18-1. The Visual Studio debugger The state of the program is accessible through a number of windows showing different aspects of the running program, usually docked at the bottom of the debugging window. It is possible, for instance, to inspect the state of the local variables of the current method (the Locals window showing the local variables and arguments, e and s in this example) or the state of the call stack to see the sequence of method calls (the Call Stack window). An important window is the Watch view, which can be used to write variable names and simple expressions and watch them change during the execution. It is also possible to evaluate expressions in the Immediate

/*!40000 ALTER TABLE `expert_mysql`.`staff` DISABLE KEYS */; LOCK TABLES `expert_mysql`.`staff` WRITE; INSERT INTO `expert_mysql`.`staff` VALUES ('333445555','John','Q','Smith','M',30000,'333444444'), ('123763153','William','E','Walters','M',25000,'123654321'), ('333444444','Alicia','F','St.Cruz','F',25000,NULL), ('921312388','Goy','X','Hong','F',40000,'123654321'), ('800122337','Rajesh','G','Kardakarna','M',38000,'333445555'), ('820123637','Monty','C','Smythe','M',38000,'333445555'), ('830132335','Richard','E','Jones','M',38000,'333445555'), ('333445665','Edward','E','Engles','M',25000,'333445555'), ('123654321','Beware','D','Borg','F',55000,'333444444'), ('123456789','Wilma','N','Maxima','F',43000,'333445555'); UNLOCK TABLES; /*!40000 ALTER TABLE `expert_mysql`.`staff` ENABLE KEYS */; --- Table structure for table `tasking` -DROP TABLE IF EXISTS `expert_mysql`.`tasking`; CREATE TABLE `expert_mysql`.`tasking` ( `id` char(9) NOT NULL, `project_number` char(9) NOT NULL, `hours_worked` double DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1; --- Dumping data for table `tasking` --

Next, let s see an example of exposing an F# object type as a COM component. There are several reasons it can be useful to expose a managed class as a COM component, but perhaps the most important is interoperability with legacy systems. COM has been around for a decade and has permeated every aspect of Windows development. Systems have largely used COM infrastructures, and they can be extended using this technology. COM components are heavily used by applications based on the Active Scripting architecture, such as ASP and VBA in Microsoft Office. The ability to expose F# code to existing applications is useful because it allows you to immediately start using this new language and integrate it seamlessly into existing systems.

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