asp net core barcode scanner

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The JavaScript function setTimeout allows you to execute a function after a specified amount of time has elapsed. It takes two arguments. The first argument is a string containing the function you want to execute. The second argument is the number of milliseconds that will elapse before the first argument is executed. setTimeout("function",interval) It s a good idea to always assign the result of this function to a variable: variable = setTimeout("function",interval) You ll need to do this if you want to cancel the action that has been queued up. You can cancel a pending action using a function called clearTimeout. This function takes one argument, which is a variable that has been assigned to the result of a setTimeout function: clearTimeout(variable) Let s update the positionMessage function so that it calls moveMessage after 5 seconds (5,000 milliseconds): function positionMessage() { if (!document.getElementById) return false; if (!document.getElementById("message")) return false; var elem = document.getElementById("message"); elem.style.position = "absolute"; elem.style.left = "50px"; elem.style.top = "100px"; movement = setTimeout("moveMessage()",5000); } The positionMessage function is called when the page loads: addLoadEvent(positionMessage); At first, the message appears at its specified coordinates. After five seconds, the message jumps 150 pixels to the right. If you want to cancel that action any time before the five seconds elapse, you could do so with this statement: clearTimeout(movement); The movement variable refers to the setTimeout function defined in positionMessage. It s a global variable; it wasn t declared with the var keyword. This means the action can be canceled outside the positionMessage function.

Android phones are amazing small computing devices that can connect you to the Internet just about anywhere, but they are also phones. In this chapter, you ll explore the phone features of Android and get to the nitty-gritty of sending and receiving calls and managing your contacts. You ll also look at Google Voice as a VoIP option for forwarding calls and using visual voicemail.

private void stop() { try { if (type == RECORD_AUDIO || type == RECORD_VIDEO) { recorder.commit(); if (type == RECORD_AUDIO) { String file = location + "/audio.amr"; writeToFile(dataOut.toByteArray(), file); play(file, "Recorded Audio"); } else { String file = location + "/video.3gp"; writeToFile(dataOut.toByteArray(), file); play(file, "Recorded Video"); } status.setText("Data saved"); state = STATE_READY; } } catch (IOException ioe) { status.setText(ioe.getMessage()); } }

private void play(String location, String message) { Screen playback = new PlayingScreen(location, message);

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Moving an element by 150 pixels after an interval of five seconds is a sort of animation, albeit a very primitive one. Effective animation uses incremental movement. Moving from the starting position to the final location should happen in a series of steps rather than one quick jump.

UiApplication.getUiApplication().pushScreen(playback); } }

The first time my husband tried to make a call with his Android phone, he tried browsing to the dialer app in the app tray and then making the call. It works, but it involves a lot of unnecessary extra steps. He could have just pushed the green button on the phone. The dialer is the built-in app responsible for dialing the phone, browsing your contacts, and keeping a log of calls you ve received. If your phone doesn t come with a button that launches it directly, there s usually a shortcut to the dialer on your Home screen.

Let s update the moveMessage function so that movement occurs incrementally. Here s the logic behind the new function: 1. 2. 3. 4. Get the element s current position. If the element has reached its final destination, leave the function. Otherwise, move the element closer to its destination. Repeat from step 1 after a pause.

To show off the power of the new PlayingScreen, provide a way to directly enter it without going through RecordingScreen. Listing 3-4 shows how you can convert RecordingChoicesScreen from the previous chapter into ChoicesScreen. ChoicesScreen keeps the existing options for starting a record operation, but it also adds the ability to enter a file location or web URL and then select Play Media to launch it directly. Note that this will only play MMAPI-compatible media, so it will work for most audio and video, but not SVG, Plazmic, or other unsupported media types.

Listing 3-4. A Screen to Start Recording or Playing a Particular File package com.apress.king.mediagrabber; import import import import import import import net.rim.device.api.ui.Field; net.rim.device.api.ui.MenuItem; net.rim.device.api.ui.UiApplication; net.rim.device.api.ui.component.BasicEditField; net.rim.device.api.ui.component.LabelField; net.rim.device.api.ui.component.Menu; net.rim.device.api.ui.container.MainScreen;

Figure 4 1 shows the four basic areas of the dialer app: Phone, Call log, Contacts, and Favorites. Some phones have variations on the look and feel of these areas, but the basic layout is pretty consistent.

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