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Caution At the time of writing, the ask_save_file method does not work properly on OS X with the latest version of Shoes. This is a known bug, however, and may well not be present on the version you are running.
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Create slides with information you use repeatedly in business communications for example, your mission statement, organizational chart, contact information, or hiring policy and save them to a Slide Library so you can easily insert them in future presentations.
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Page 138 If you are using a DV camera and are narrating slides, the audio is not played back on your computer. Therefore, make sure the volume on the camera is set high enough that you can hear the audio to properly narrate and synchronize the audio with the slides. 5. If video or audio already appears on the timeline, one of the dialog boxes shown in Figures 8.5 and 8.6 appears. Do one of the following: Click Yes if you want to clear the Video track (or Audio 2 track, if you captured audio only). The narration you capture will then be added to the appropriate track of the timeline after completing the wizard. Click No if you do not want to clear the Video track (or Audio 2 track). The narration will be imported into the project, but it will not be added to the timeline. Click Cancel to return to the Capture Video, Audio, or Still Images page of the Capture Wizard.
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Make sure to use Qt Creator to include your web content as application resources. Now, the content is bundled into your application binary. Management is much easier since we don t have to worry about moving around a bunch of external files. Be careful, though, too much web content stored as a resource will bloat the size of your application binary. In this section we ve shown how to use Qt to render HTML5 content using four different methods: a QtWebKit based browser that loads content off the net in the traditional manner, a QtWebKit browser that uses the HTML5 application cache to enable that same hosted application to be available without network connectivity, a hybrid app where the content is stored locally on the device file system, and a hybrid app where the content is bundled as a resource into the application binary. In the next section we will take a more in-depth look at some of the new features in HTML5. NOTE: One last option for developing web applications is the Symbian Web Runtime. This is a Nokia proprietary technology where web files such as HTML, JavaScript, and CSS can be bundled into an archive package file and installed and run on the device like a native application. It is similar to the W3C widget standard defined here: www.w3.org/TR/2009/CR-widgets20090723/. The Symbian Web Runtime will be supported on the Symbian platform for legacy applications, but is not the recommended development path moving forward.
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The .NET Framework provides an API through which components can support XPath queries against underlying data stores. To use the XPath API, it's necessary to understand the XPath
{CopyDatabaseValue,FOO.CPP,DB.DLL}szBuff. Now, no matter where you are inside functions called by CopyDatabaseValue, you can easily keep an eye on szBuff. Timing Code in the Watch Window Here's another neat trick using the Watch window to time code. The $CLK pseudoregister can serve as a rudimentary timer. In many cases, you want just a rough idea of the time between two points, such as how long a call to the database took. $CLK makes it easy to find out how long the call took. Keep in mind that this time includes the debugger overhead. The trick is to enter two $CLK watches, the first being just $CLK and the second $CLK=0. The second watch zeros out the timer after you start running again. Although not a perfect timer, $CLK is good enough for some ballpark guesses. The Undocumented Pseudoregisters Two new pseudoregisters have shown up in Visual Studio .NET. Since the word undocumented is in the title of this section, I have to warn you that these values might disappear in future versions of the debugger. The first pseudoregister is $HANDLES. This shows the number of open handles in the current process. This is a killer idea that allows you to keep an eye on handle leaks as you're debugging. If you see the number reported by $HANDLES creeping up, you know you have a leak. $HANDLES,d has a permanent place in my Watch window because it's so amazingly useful. The second undocumented pseudohandle is $VFRAME, a great feature for helping track down the stack in release builds. $VFRAME is short for virtual frame pointer. On IA32 machines, $VFRAME points to the next stack frame so that you can use it to help walk the stack back manually. If you're using standard stack frame, $VFRAME points to the previous item's EBP value. Expanding Your Own Types Automatically Although managed C++ and C# debugging allows you to expand your own types in the Watch window, the autoexpansion offered by native debugging takes this ability to new heights. In fact, starting with Visual Studio .NET 2003, the Watch window and data tips now attempt to show you the first few members of structures and classes automatically. However, you've probably seen a few common types, such as CObject, RECT, and some of the STL types, expand in the Watch window with even more information, which all happens to be provided by the autoexpand rules. The magic happens in the AUTOEXP.DAT text file located in the <Visual Studio .NET installation directory>\ COMMON7\PACKAGES\DEBUGGER subdirectory. You can add your own types to the autoexpand list by entering them into the AUTOEXP.DAT file. (Unfortunately, the AUTOEXP.DAT file must reside in that directory, so you'll have to set your version control software's working directory to pull AUTOEXPAND.DAT to that directory.) As an example, I'll add an autoexpand entry for the PROCESS_INFORMATION structure that is passed to the CreateProcess API function. The first step is to check what the Visual Studio .NET debugger recognizes as the type. In a sample program, I put a PROCESS_INFORMATION variable in the Watch window and looked at the Type column on the right side of the Watch window. The type was _PROCESS_INFORMATION, which if you look at the following structure definition, matches the structure tag. typedef struct _PROCESS_INFORMATION { HANDLE hProcess; HANDLE hThread; 249
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At this point, Object-B can be garbage collected if no other roots are keeping it alive . When Object-A wants to call Object-B s method, it would query GCHandle s read-only Target property . If this property returns a non-null value, then Object-B is still alive . Object-A s code would then cast the returned reference to Object-B s type and call the method . If the Target property returns null, then Object-B has been collected and Object-A would not attempt to call the method . At this point, Object-A s code would probably also call GCHandle s Free method to relinquish the GCHandle instance . Since working with the GCHandle type can be a bit cumbersome and because it requires elevated security to keep or pin an object in memory, the System namespace includes a WeakReference class to help you . This class is really just an object-oriented wrapper around a GCHandle instance: logically, its constructor calls GCHandle s Alloc, its Target property calls GCHandle s Target property, and its Finalize method calls GCHandle s Free method . In addition, no special permissions are required for code to use the WeakReference class because the class supports only weak references; it doesn t support the behavior provided by GCHandle instances allocated with a GCHandleType of Normal or Pinned . The downside of the WeakReference class is that its object must be allocated on the heap . So the WeakReference class is a heavier-weight object than a GCHandle instance . Also, the WeakReference class doesn t implement the dispose pattern (which is a bug), so there is no way for you to free the GCHandle table entry explicitly; you have to wait for a garbage collection to kick in so that its Finalize method is called . The WeakReference class was introduced in version 1 .0 of the .NET Framework; therefore, it is not generic (generics were introduced in version 2 .0) . So, I have created a little, lightweight structure that I sometimes use to put a compile-time type-safe wrapper around the WeakReference class:
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How will you disable transmitting error detail to users of the site How will you implement a default error page for users How will you ensure that errors are still available for administrators to view How can you debug against the staging environment How can you apply these settings when you publish the web application in the future, while keeping the current settings for use in your development environment
The series name is a property of the data series . By default, the series name is created by Excel when a chart is generated . It is displayed in the legend provided that you selected this option . In many cases, this is all you need because you usually don t need any other information for identifying a data series for example, in the series formula of the formula bar or for navigating in the chart . On the other hand, there are some scenarios in which the presence of a specific series name is also important in charts without a legend or enables interesting effects . Proceed as follows to specify and/or edit a series name in the context of Figure 8-15:
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