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When working with QMainWindow, Qt s class that represents your application s main window, you should be aware of three methods that help you manage this organization of your application s user interface. The first two are the centralWidget and setCentralWidget methods. They let you get the currently established central widget and set it to a new widget. Your central widget can be and often is a single widget, such as a QListView or QWebView. If you need a more complicated layout, you can use a composite widget with layouts. Here s where Qt Creator really shines, because you can use it (simply right-click the project Add New Qt Qt Designer Form) to create a new composite widget as your application s central widget. Once you do this, in your code you just create an instance of this widget, and then set it as the central widget for the main window. The final method to be aware of is menuBar, which returns an instance of the Qt menu bar that hosts the options menu. Historically from the desktop, this menu bar would have multiple menus (e.g., File, Edit. and so forth), but on Nokia s mobile platforms, these menus are collapsed into the single options menu. You ll add actions to the menu bar that represent user actions, such as switching from one view to another.
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$WINDOWS.~BT This folder contains the minimal copy of Windows Vista that manages the actual work of setting up the new operating system and migrating files and settings. $UPGRADE.~OS Setup gathers settings for the operating system and stores them in this temporary folder to be applied to Windows Vista after installation is complete.
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In this chapter, I ll describe how to properly implement the operations that all objects must exhibit. Specifically, I ll talk about object equality, identity, hash codes, and cloning.
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The procedure opens a transaction just for the sake of creating a save point called S1. It inserts a new row to Sequence, which generates a new identity value in the table and stores it in the @val output parameter. The procedure then rolls back the INSERT. But a rollback doesn t undo a variable assignment, nor does it undo incrementing the identity value. Plus, the identity resource is not locked for the duration of an outer transaction; rather, it s locked only for a fraction of a second to increment. This behavior of the IDENTITY property is crucial for maintaining a nonblocking sequence.
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For more information about le management, see 7, Managing Files, Folders, and Drives. For more information about backing up, see 20, Performing Routine Maintenance.
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CHECKPOINT; GO DECLARE @numrecords AS INT, @size AS BIGINT; SELECT @numrecords = COUNT(*), @size = COALESCE(SUM([Log Record Length]), 0) FROM fn_dblog(NULL, NULL) AS D; -- <operation> SELECT COUNT(*) - @numrecords AS numrecords, CAST((COALESCE(SUM([Log Record Length]), 0) - @size) / 1024. / 1024. AS NUMERIC(12, 2)) AS size_mb FROM fn_dblog(NULL, NULL) AS D;
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You can define multiple containers within the <unity> section of a configuration file providing each has a unique name, and load each one into a separate container at run time. If you do not assign a name to a container in the configuration file, it becomes the default container, and you can load it by omitting the name parameter in the LoadConfiguration method. To load a container programmatically in this way, you must add the System.Configuration.dll assembly and the Microsoft.Practices.Unity.Configuration.dll assembly to your project. You should also import the following namespaces: Microsoft.Practices.EnterpriseLibrary.Common.Configuration.Unity Microsoft.Practices.Unity
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14 Chars, Strings, and Working with Text
marketing manager We recently had a session with our most important customers to identify potential areas of improvement. One of the comments that we heard frequently was that they want a way to log on to our website and view past order information. I know I hate having to log on to websites every time I visit the webpage, so if we could remember their logon information, I think the customers would be happier. Development manager This seems like a fair request; however, we need to keep
In this chapter: How Windows Performs I/O Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The CLR s Asynchronous Programming Model (APM) . . . . . . . . . . . . . . . . . . . . . The AsyncEnumerator Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The APM and Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications and Their Threading Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Implementing a Server Asynchronously . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The APM and Compute-Bound Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . APM Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Request Priorities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Converting the IAsyncResult APM to a Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Event-Based Asynchronous Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Programming Model Soup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 755 761 765 769 770 773 774 776 780 783 784 788
Lesson 3
A. Windows Basic B. Windows Digest c. Client certificates D. Custom SOAP headers
'products' => array ()); // Return void result if the search string is void if (empty ($searchString)) return $search_result; // Search string delimiters $delimiters = ',.; '; // Use strtok to get the first word of the search string $word = strtok($searchString, $delimiters); $words = array (); // Build words array while ($word) { $words[] = $word; // Get the next word of the search string $word = strtok($delimiters); } // Split the search words in two categories: accepted and ignored $search_words = Catalog::FlagStopWords($words); $search_result['accepted_words'] = $search_words['accepted_words']; $search_result['ignored_words'] = $search_words['ignored_words']; // Return void result if all words are stop words if (count($search_result['accepted_words']) == 0) return $search_result; // Count the number of search results $sql = 'SELECT catalog_count_search_result(:words, :all_words);'; $params = array ( ':words' => '{' . implode(', ', $search_result['accepted_words']) . '}', ':all_words' => $allWords); // Calculate the number of pages required to display the products $rHowManyPages = Catalog::HowManyPages($sql, $params); // Calculate the start item $start_item = ($pageNo - 1) * PRODUCTS_PER_PAGE; // Retrieve the list of matching products $sql = 'SELECT * FROM catalog_search(:words, :all_words, :short_product_description_length, :products_per_page, :start_page);'; $params = array (
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Let s take a closer look at each of these benefits.
Before I jump into discussing the Exception dialog box, I need to clarify what happens when an exception is encountered by a native code debugger. The instant an exception occurs, the operating system suspends the process (which means all threads stop), points at the spot where the exception occurred, and notifies the debugger that an exception occurred. This is called the first chance exception because it's the first time the debugger has an opportunity to handle it. The debugger has two choices: it can handle the exception so that the debuggee never sees the exception, or it can pass the exception on to the debuggee. The idea that the debugger can handle, or eat, the exception might strike you as odd. However, as you saw in 4, setting a breakpoint in native code entails setting the instruction at the location to INT 3, the breakpoint opcode. In the breakpoint case, the debugger is causing the exception in the debuggee, so the debugger must handle those exceptions. If the exception wasn't caused by the debugger, the debugger tells the operating system that it doesn't want to handle the exception, and the exception is passed back to the debuggee. The debugger also emits a message to the Output window indicating that a first chance exception occurred. The debuggee restarts and, if the debuggee has exception handling set up, the exception is processed and the debuggee continues on its merry way. If the debuggee doesn't have exception handling set up, the exception will propagate up to the final exception handlers inside NTDLL.DLL. At that point, the operating system will suspend the debuggee again and tell the debugger the second chance exception occurred for the exception. This means that the process is going to die from an unhandled exception. The important issue to note about native exception handling is that when you see the first chance exception message in the Output window, an exception has occurred in your process. As I pointed out, exceptions are a performance bottleneck, so if you're seeing lots of "First-chance exception at " messages when you run your process, you have performance issues. The insidious problem here is that C++ exception handling is implemented with structured exception handling (SEH) behind the scenes, so using C++ exceptions can kill your performance. Exceptions are for exceptional conditions. Avoid C++ exceptions in native applications for general development. To track down performance problems related to exceptions, you can always look for exceptions in code reviews. However, that can sometimes be a daunting task on a large code base. The Exceptions dialog box in Visual Studio .NET can make stopping immediately where exceptions occur and finding where they are handled a complete piece of cake. Figure 7-7 shows the Exceptions dialog box that's accessible from the Debug menu or by pressing Ctrl+Alt+E with the default keyboard mappings.
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