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Tap on Choose image, browse to your Camera Roll or photo album on iPhone, select and import the QR code image to the QR code reader app.

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If multiple threads call GetSingleton simultaneously, then this version might create two (or more) Singleton objects . However, the call to Interlocked.CompareExchange ensures that only one of the references is ever published into the s_value field . Any object not rooted by this field will be garbage collected later on . Since, in most applications, it is unlikely that multiple threads will call GetSingleton at the same time, it is unlikely that more than one Singleton object will ever be created . Now it might upset you that multiple Singleton objects could be created, but there are many benefits to this code . First, it is very fast . Second, it never blocks a thread; if a thread pool thread is blocked on a Monitor or any other kernel-mode thread synchronization construct, then the thread pool creates another thread to keep the CPUs saturated with work . So now, another megabyte or more of memory is allocated and initialized and all the DLLs get a thread attach notification . With CompareExchange, this can never happen . Of course, you can use this technique only when the constructor has no side effects . The FCL offers two types that encapsulate the patterns described in this section . The generic System.Lazy class looks like this (some methods are not shown):

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contactListener = new ContactListener(); world->SetContactListener(contactListener);

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With this free online tool you can decode various barcode formats. We support the following barcode symbologies: 1D Point of sale: UPC-A, UPC-E, EAN-8, ... About · Privacy · Contact · Donate

The first step in building any Cocoa application is designing and laying out its user interface in Interface Builder. There are many ways to design a user interface, but because this is a Macintosh program, you want to strive to make it as Mac-like as possible. Doing so will ensure that your program maintains the Macintosh look and feel and performs as Macintosh users expect. A good way to begin is to look at well-designed Mac OS X programs and see how their designers constructed the program s interface. There are many examples to choose from, including programs developed by Apple (such as iTunes and Mail) and programs developed by third-party developers (like BBEdit from Bare Bones Software [http://www.barebones.com] and the programs written by the Omni Group [http://www.omnigroup.com]). You should also invest some time reading about good interface design. Many books, articles, and online sites detail and explain the basic principles of user interface design. The Resources section at the end of the book provides some recommendations.

2. 3.

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In the case of a data-driven subscription, the Report Server invokes IDeliveryExtension.Deliver for each recipient. The notification object encapsulates everything the extension needs to deliver the reports and notifies the Report Server about the delivery status. First, the code retrieves the user-entered values from the Notification. UserData property. Then, it calls the DeliverReport method, which is where the bulk of the custom delivery logic resides, as shown in listing 13.3.


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Figure 28-13. When a dialog box is in edit mode, the bottom-right corner shows a grow box, which resizes the dialog box. Here no grow box is visible.

self.blendFunc = (ccBlendFunc){GL_SRC_ALPHA, GL_ONE};


private void BindProcessesToListView() { ObjectDataProvider provider = new ObjectDataProvider(); provider.ObjectType = typeof(Process); provider.MethodName = "GetProcesses"; Binding binding = new Binding(); binding.Source = provider; binding.Mode = BindingMode.OneWay;

You might want to edit a favorite item for the following reasons:

n ----------1 2 3 4 5 6 7 8 9 10 rnd ---------------------0.372112088734625 0.351204240953987 0.534180551426038 0.0494653055888316 0.387218774605993 0.585318509610502 0.640748344596822 0.741752879888198 0.120974678583898 0.768738750832328

count countOfIndexesInRange:

By changing the parameters of the openPanel method (bold in the listing), you can alter the behavior of the displayed dialog box. For example, getFilename only needs a single filename from the user, so you set setCanChooseFiles to TRUE and setCanChooseDirectories and setAllowsMultipleSelection to FALSE. The getDirectory method prompts the user for a directory name, so you set setCanChooseFiles and setAllowsMultipleSelection to FALSE, and setCanChooseDirectories to TRUE. Both methods return either the file or directory name as an NSString. MyTask support class The MyTask class is one of the more interesting classes in the project. This class is responsible for running a task (program), collecting the results of the run, and returning the result to the user. Is uses the Foundation class NSTask class to do so. The NSTask class facilitates running a program as a subprocess of the active program, as well as monitoring and interacting with the execution of the subprocess. In a sense, this is similar to the UNIX fork/exec model of running a child process of a parent. With NSTask, there are two ways to run subprocess: you can run the process in the environment it inherits from its creator process or use the NSTask launch method. The following example demonstrates how to use the first method in Objective-C:

Notice that now you get the actual number of rows returned by the source operator. When you get elaborated plans like this one that do not fit in one screen, you can use a really cool new zooming feature. Press the + button that appears at the bottom right corner of the execution plan pane, and you will get a rectangle that allows you to navigate to a desired place in the plan, as shown in Figure 3-8 .

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Decode a 1D or 2D barcode from an image on the web. Supported formats include: UPC-A and UPC-E; EAN-8 and EAN-13; Code 39.

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2. Google Lens: An AI interface by Google, Google Lens recognizes everything in the camera including QR codes. It is available on both the camera app as well as the Google Assistant. Simply download Google Lens and start scanning QR codes or use Google Lens from Google Assistant.

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