.net core qr code reader

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A ValidationEvent handler requires a signature that contains an object parameter that represents the sender of the event and a ValidationEventArgs parameter. The following code shows an example of a ValidationEvent handler.

Logical anD Is the default and means that all the precedence constraints connected to the task or container need to meet their conditions in order for the downstream task or container to execute. Logical Or Lets you specify that only one of the precedence constraints needs to meet its requirements in order for the task or container to execute.

When you change the logical condition to either Logical AND or Logical OR, the change propagates to all the precedence constraints connected to the same downstream task or container. When you set the logical condition to Logical OR, the precedence constraint lines become dashed for all the related precedence constraints. Returning to the example in Figure 2-10, the constraints shown control the workflow of the control flow in the following way:

photosPerPage: 10; onSuccess: function(res:FlickrResult) { for(photo in res.photos) { Success, print println("{photo.urlMedium}"); photo URLs } } onFailure: function(s:String) { Failure, print println("{s}"); message } }.loadPage(1); Prevent javafx.stage.Stage { visible: true; }

' VB Private Sub ValidationHandler(ByVal sender As Object, ByVal e As _ Xml.Schema.ValidationEventArgs) ' Code to handle the event goes here End Sub // C# private void ValidationHandler(object sender, Xml.Schema.ValidationEventArgs e) { // Code to handle the event goes here }

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Each loop in the Foreach Loop Container will check for files and first perform a Script Task and an Execute SQL Task. The precedence constraints after each of these tasks are marked as Success; therefore, both tasks need to be completed successfully for the Data Flow Task to run.

After creating the method, you need to add the method as a handler for the ValidationEvent, as shown in the following code:

Listing 8.7 is a small test program to create a web service request for photo details and print the URL of each medium-size image. To make the code work you ll need to supply the key you got when you signed up for a Flickr developer account. As you can see, all that hard work paid off in the form of a nice and simple class we can use to get at our photo data. Because the network activity takes place in the background, away from the main GUI thread, we need to stop the application from immediately terminating before Flickr has time to send back any details. We do this by creating a dummy window; it s a crude solution but effective. If all goes well, the code should spit out onto the console a list of 10 web addresses, one for each medium-size image in the first page of the gallery we accessed. Now that our network code is complete, we can get back to our usual habit of writing cool GUI code.

The Data Flow Task has two precedence constraints, one Success and one Failure. If the Data Flow Task is successful, a File System Task runs that archives the successfully processed file to a folder named Archive. If the Data Flow Task fails, a different File System Task moves the file to a folder named Error_Files. The final task in the Foreach Loop Container is an Execute SQL Task that audits the processing of the file. It has two precedence constraints connected to it, and they are marked as Logical OR with a Completion constraint. This means that when either the File System Task that moves the successful file completes or the File System Task that moves the error file completes, this Execute SQL Task runs. When the Foreach Loop Container completes, it has a precedence constraint tied to another Execute SQL Task. Figure 2-11 showed the editor for this constraint, which requires that the Foreach Loop Container is successful and that the FileCount variable has a value greater than 0. This variable is updated in the Script Task within the Foreach Loop Container. If there are no files to process, the FileCount value is 0, and the final Execute SQL Task in the control flow does not run.

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