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Lesson 2: Using Client-Side State Management . . . . . . . . . . . . . . . . . . . . . 120 Choosing Client-Side or Server-Side State Management View State Hidden Fields Cookies Query Strings Lesson Summary Lesson Review Application State Session State Lesson Summary Lesson Review Case Scenario 1: Selecting the Proper Events to Use Case Scenario 2: Remembering User Credentials Case Scenario 3: Analyzing Information for Individual Users and for All Users Respond to Application and Session Events Create Event Handlers for Pages and Controls Manage State by Using Client-Based State Management Options Manage State by Using Server-Based State Management Options Maintain State by Using Database Technology 121 123 128 129 133 141 142 144 145 154 154 155 156 156 157 157 158 158 158
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Both services and drivers are located under the preceding Services registry key, but services can be identified by the Type value of 0x10 (a service that runs in its own process as a stand-alone program) or 0x20 (a service that runs in a shared process). A driver has type 0x1 (a kernel driver) or 0x2 (a file system driver). In addition, the service s Start value is always either 2 (automatic), 3 (manual), or 4 (disabled), while drivers have a Start value of 0 (boot) or 1 (System). All service log-on accounts have an associated password. Built-in service accounts have long and complex passwords assigned by Windows. Administrators cannot easily enumerate those passwords and never have to change them. Custom service log-on account passwords must be set by administrators and are stored in a protected local registry area. Any service account password can be enumerated by local administrators using specialized software.
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Figure 1-3. The Mac OS X Terminal in OS X Tiger with a working version of Ruby installed and tested To see if Ruby is installed, type the following at the command prompt from within T erminal (be sure to press Enter afterward): ruby v
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Tables are normalized when they represent propositions about entities of one type in other words, when they represent a single set. This means that entities do not overlap in tables and that tables are orthogonal or normal in mathematical terms. When a table meets a certain prescribed set of conditions, it is said to be in a particular normal form. A database is normalized when all tables are normalized. You can create fully normalized database models with ORM or with the ER approach. Normalization is a redesign process to unbundle the entities. The process involves decomposition but not decomposition that leads to a loss of information. After the normalization process, all the original information must be obtainable with queries that involve relational operators such as Join and others. The normalization is achieved by applying a sequence of rules to create what are called normal forms. The goal is to eliminate redundancy and incompleteness. Note that the latter is often overlooked; however, normalization eliminates incompleteness in addition to eliminating redundancy. Many normal forms are de ned. The most important ones are rst, second, third, Boyce-Codd, fourth, and fth normal forms. If a database is in fth normal form, it is said to be fully normalized. If a database is not fully normalized, you can experience data manipulation anomalies. I ll start with the rst four normal forms, which deal with functional dependencies. A dependent variable is functionally dependent on an independent one when exactly one value of the dependent variable exists for each value of independent variable. This means that if we know the value of the independent variable, we know the value of the dependent variable as well. In a relation, nonkey attributes are functionally dependent on keys; if you know the key value, you can nd the nonkey attribute value. This is what functional dependency in a relation means.
and the state of the CPU at that time. You might have guessed that the EXCEPTION_POINTERS structure will come in handy later in this chapter. SEH isn't limited just to handling crashes. You can also create your own exceptions with the RaiseException API function. Most developers don't use RaiseException, but it does offer a way to quickly leave deeply nested conditional statements in code. The RaiseException exit technique is cleaner than using the old setjmp and longjmp runtime functions. Before you dive in and start using SEH, you need to be aware of two of its limitations. The first is minor: your custom error codes are limited to a single unsigned integer. The second limitation is a little more serious: SEH doesn't mix well with C++ programming because C++ exceptions are implemented internally with SEH and the compiler complains when you try to combine them indiscriminately. The reason for the conflict is that when straight SEH unwinds out of a function, it doesn't call any of the C++ object destructors for objects created on the stack. Because C++ objects can do all sorts of initialization in their constructors, such as allocating memory for internal data structures, skipping the destructors can lead to memory leaks and other problems. If you'd like to learn more about the basics of SEH, I recommend two references in addition to perusing the Microsoft Developer Network (MSDN). The best overview of SEH is in Jeffrey Richter's Programming Applications for Microsoft Windows (Microsoft Press, 1999). If you're curious about the actual SEH implementation, check out Matt Pietrek's article "A Crash Course on the Depths of Win32 Structured Exception Handling" in the January 1997 Microsoft Systems Journal. One advanced feature of SEH I do want to mention, which first appeared with Microsoft Windows XP and Microsoft Windows Server 2003, is vectored exception handling. With regular SEH, there's no way to get globally notified when an exception occurs. Although generally not something you'd like to have as part of your day-to-day development, vectored exception handling allows you to get either the first notification or the last notification of all SEH exceptions occurring in your application. The first time I realized that Microsoft had added vectored exception handling to the operating system, I immediately saw how to write an exception monitor for SEH so that you could keep an eye on what exceptions your application was generating without running your application under a debugger. To set up receiving vectored exceptions, simply call the AddVectoredExceptionHandler function, where the second parameter is a pointer to the function you want called when any first-chance exceptions occur in your application. The first parameter is a Boolean value that indicates whether you want notifications before or after the normal exception chain unwinding. Your callback function will get a pointer to an EXCEPTION_POINTERS structure describing the exception. As you can guess, armed with that information, getting the exceptions is a piece of cake. The XPExceptMon project, which you can find with this book's sample files, shows exactly how to use the vectored exceptions because it writes out each exception your application encounters. All the work for setting up and tearing down the vectored exception hook takes XPExceptMon.DLL, so utilizing it from your applications is place in the DllMain for trivial. My interest was showing vectored exceptions, so all XPExceptMon does is report the exception type and the faulting address to a text file. If you're looking for a place to get some practice using the DBGHELP.DLL symbol engine, feel free to add function lookup and stack walking to XPExceptMon.
The DNS server then responds to the client with all records matching the query. Although most SRV resource records are created automatically, you might need to cre ate them through the DNS console to add fault tolerance or troubleshoot network ser vices. The following example shows the textual representation of two SRV records that have been configured manually in the DNS console:
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