.net core barcode generator

.net core barcode generator

.net core barcode generator

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Figure 15-4. BackgroundWorker demonstration Before you can use the BackgroundWorker, you must define a method that encapsulates the work that you want done on a background thread. This method supports cancellation and takes an integer argument (contained in the CustomWorkerArgs instance that is passed in via the DoWorkEventArgs object) that controls how long the method takes to execute. The long-running operation is simulated via Thread.Sleep: public void performLengthyOperation(object sender, DoWorkEventArgs e) { BackgroundWorker bw = (BackgroundWorker)sender; CustomWorkerArgs args = (CustomWorkerArgs)e.Argument; e.Result = args; for (int i = 1; i <= 10; i++) { if (bw.CancellationPending) { e.Cancel = true; break; } else { Thread.Sleep(args.sleepTime / 10); bw.ReportProgress(i * 10, args); } } } The DoWorkEventArgs object defines several useful properties: Argument, which contains an arbitrary object that was passed to RunWorkerAsync; Cancel, which you set to true to cancel the work (generally done when CancellationPending is set to true); and Result, which is used to store an object that can be processed by the RunWorkerCompleted event handler. Since this configuration of BackgroundWorker supports cancellation (something we must explicitly implement in the method that performs work), the CancellationPending property is checked, and the loop

Combining the shell command, eval, and the date utility s format string, it can all be done in a single command; date is called with a format string that produces shell code to set all the variables, and eval executes it. Usage date_vars [DATE OPTIONS] The output of the date command in the date_vars function looks like this: DATE=2005-02-05 YEAR=2005 MONTH=02 DAY=05 TIME=22:26:04 HOUR=22 MINUTE=26 SECOND=04 datestamp=2005-02-05_22.26.04 DayOfWeek=Sat DayOfYear=036 DayNum=6 MonthAbbrev=Feb This is interpreted as a shell command by eval to set the variables. While date_vars is usually called without any arguments, it can be used with whatever options your date utility provides. For example, if you have GNU date, you can use the -d option to use a date other than the current one: date_vars -d yesterday The Script date_vars() { eval $(date "$@" "+DATE=%Y-%m-%d YEAR=%Y MONTH=%m DAY=%d TIME=%H:%M:%S HOUR=%H MINUTE=%M

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Line 1 of Listing 9-5 shows the format of the URL. It includes a required $rest, which is the resulting format type, followed by the required $controller and an optional $id. Because $rest should only allow the two format types we are expecting, line 5 uses an inList constraint much like the constraints discussed in the GORM discussions of 6. Anything other than a rest or a json will cause an HTTP 404 (Not Found) error. Line 2 specifies that the RestController will handle any URL with this mapping. Finally, line 3 maps the HTTP methods to Grails conventional actions on the RestController.

aborts prematurely if it is true. The ReportProgress method takes two parameters: an integer representing percentage completion and optionally a user state, used to communicate some form of information to the progress event handler. The CustomWorkerArgs class simply holds an integer representing an index (so we can easily access the button/text block associated with a BackgroundWorker) and an integer for sleepTime (the total time the worker method should take to execute). Using a class like this is how you can communicate as much information as needed to the BackgroundWorker. class CustomWorkerArgs { public int index; public int sleepTime; } Since the various event handlers for BackgroundWorker include a sender (the BackgroundWorker instance), you can hold a reference to this worker at the class level and compare the instances instead of passing the index via CustomWorkerArgs. In fact, in one case (when the worker is cancelled or throws an exception), this is mandated. However, this information is included in the CustomWorkerArgs class in order to show where information can be accessed and used in the BackgroundWorker s event handlers. You can keep an array of BackgroundWorker instances at the class level, along with an array of Buttons and an array of TextBlocks. The Button, in XAML, stores the appropriate index in the Tag attribute. A single Button event handler is used to start a BackgroundWorker. private void buttonTask_Click(object sender, RoutedEventArgs e) { // Tag used to get index for button/text blocks int index = Convert.ToInt32(((Button)sender).Tag); if (workers[index] != null) { resultBoxes[index].Text = "Cancelling..."; workers[index].CancelAsync(); bwButtons[index].Content = "Start"; } else { BackgroundWorker worker = new BackgroundWorker(); worker.WorkerReportsProgress = true; worker.WorkerSupportsCancellation = true; worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);

SECOND=%S datestamp=%Y-%m-%d_%H.%M.%S DayOfWeek=%a DayOfYear=%j DayNum=%w MonthAbbrev=%b") ## Remove leading zeroes for use in arithmetic expressions _MONTH=${MONTH#0} _DAY=${DAY#0} _HOUR=${HOUR#0} _MINUTE=${MINUTE#0} _SECOND=${SECOND#0}

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