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Using the interface javax.microedition.io.HttpConnection is probably the easiest way to use the MIDP API to communicate with a server. Listing 6-1 is a code segment that will create an instance of HttpConnection and use it to send a message to a server and read a response. Listing 6-1. Creating an Instance of HttpConnection /** * Makes a connection to the server and reads the data. */ public void run() { // you sync on the class because you don't want multiple // instances simultaneously attempting to download ContentConnection connection = null; DataInputStream dis = null; DataOutputStream dos = null; byte dataToSend = 3; try { // the method Connector.open() uses the URL argument // to decide what protocol to use (and hence what type // of Connection interface to return) in addition to // using the URL to determine the address of the // program to contact. connection = (ContentConnection)Connector.open( "http://frog-parrot.net:8080/servlet/ExampleServlet"); ((HttpConnection)connection).setRequestMethod(HttpConnection.POST); dos = connection.openDataOutputStream(); dos.write(dataToSend); // flush sends the message dos.flush(); // some implementations give errors if you open the data input stream // without first reading the response code: int responseCode = ((HttpConnection)connection).getResponseCode(); dis = connection.openDataInputStream(); byte received = dis.readByte(); } catch(Exception e) { // normally you would add some code here to send // the user an error message. javascript qr code reader mobile Java QR Code Reader Library to read, scan QR Code barcode ...
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17 Aug 2015 ... In this post, I'd like to share how to use ZXing to create QR code writer and reader for both desktop Java applications and Android mobile apps. } finally { // even if there is a communications error, you need // to close the connection and the streams: try { if(dis != null) { disclose(); } if(dos != null) { dosclose(); } if(connection != null) { connectionclose(); } } catch(Exception e) { // normally you would add some code here to send // the user an error message } } } Several points in Listing 6-1 require some further explanation First, it wasn t an accident that I called the method run() as if the previous code were from a subclass of Thread Since reading from a socket may cause the current thread to block, it s a good idea to spawn a new thread for communications rather than using the main thread This is good practice for essentially all Java networking code it should be running on a dedicated thread. qr code scanner java source code New QR Code Reader Library - DZone Mobile
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QR Code Reader is the fastest and most user-friendly QR code scanner available. If your Java or Symbian phone came with a built-in scanner, this would be it.HOW THE APP WORKSTo scan a ... Scanner Space Pong. 4.5. Download · More ... Listing 5-12. WebServiceSettingsBuilder Class using System; using System.Collections.Generic; using System.Text; using Microsoft.Practices.EnterpriseLibrary.Configuration.Design; using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; using Microsoft.Practices.EnterpriseLibrary.Configuration. Design.Properties; using ACME.POS.UserInterface.Configuration; namespace ACME.POS.UserInterface.Configuration.Design { class WebServiceSettingsBuilder { private WebServiceSettingsNode webServiceSettingsNode; private IConfigurationUIHierarchy hierarchy; private WebServiceSettings webServiceSettings; public WebServiceSettingsBuilder(IServiceProvider serviceProvider, WebServiceSettingsNode webServiceSettingsNode) { this.webServiceSettingsNode = webServiceSettingsNode; hierarchy = ServiceHelper.GetCurrentHierarchy( serviceProvider); webServiceSettings = new WebServiceSettings(); } public WebServiceSettings Build() { webServiceSettings.DefaultWebServiceURL = webServiceSettingsNode.DefaultWebServiceURLSetting. Name; foreach (WebServiceURLNode webServiceURLNode in hierarchy.FindNodesByType(webServiceSettingsNode, typeof(WebServiceURLNode))) { webServiceSettings.WebServiceURLs.Add(new WebServiceURL(webServiceURLNode.Name, webServiceURLNode.URL)); } return webServiceSettings; } } } You should note that global variables are a good way to let many tasks communicate with one Tip another. On the other hand, they must be seen as shared resources, so the access to those variables must be well disciplined to avoid corrupting their value, in case more than one task wants to write them. Notice that such a conflict does not exist, if a task only writes a global variable, while the others just read it. Another thing to notice is that I set the HTTP method to POST I did this because the program sends data to the server (see the sidebar GET, POST, and HEAD later in this chapter for more explanation) Another thing to notice is that in Listing 6-1 I read one byte of data from the stream regardless of how much data is available If no data is available, the thread could block and stay blocked until the program terminates It s a good idea to have the server set the Content-Length HTTP header so that your program will know precisely how much data to read from the stream (You can get the value of the Content-Length header by calling getLength(). The final steps are to create the WebServiceConfigurationDesignManager class and add the necessary attributes to the Assembly.cs file. The WebServiceConfigurationDesignManager class gets the ball rolling, so to speak. This class is used by the Configuration Console to register the correct registrar classes. In the case of the WebServiceConfigurationDesignManager class, only the WebServiceCommandRegistrar class is registered. In more complex application blocks, many more classes could be registered. As shown in Listing 5-13, the Register method is overridden, an instance of the WebServiceCommandRegistrar class is created, and the Register method on that instance is called. Listing 5-13. WebServiceConfigurationDesignManager Class using using using using using System; System.Collections.Generic; System.Configuration; System.Text; Microsoft.Practices.EnterpriseLibrary.Configuration.Design; javascript qr code reader mobile Read barcode/ QR code from existing pdf file : Spire. PDF - E-iceblue
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