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winforms ean 13 reader

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As we discussed in previous chapters, an important part of keeping your scripts secure is to test them for protection against possible vulnerabilities. Here we present a sample of such a test, in this case testing whether the technique of hashing really works. This code can be found also as hashTest.php in the 6 folder of the downloadable archive of code for Pro PHP Security at http://www.apress.com. < php // create a temporary file $tempname = '/tmp/mytestfile'; $tempfile = fopen( $tempname, 'w+' ); fwrite( $tempfile, 'hello\n' ); fclose( $tempfile ); // attempt to protect from hijacking by hashing the file contents $hash = sha1_file( $tempname ); ///////////////////////////// // attempt to hijack the file ///////////////////////////// // depending on what you want to test for, you might have another script // or some command line utility or ftp/scp do this. file_put_contents( $tempname, 'and goodbye' ); sleep( 2 ); // test whether the protection has been sufficient $newhash = sha1_file( $tempname ); if ( $hash === $newhash ) { exit( "Protection failed:\n We did not recognize that the temporary file has been changed." ); } else { exit( "Protection succeeded:\n We recognized that the temporary file has been changed." ); } > If you were to create a suite of such tests, trying different kinds of hijacking attempts, you would quickly detect any holes in your strategies. Once those were fixed, you could be sure that you have real protection against the threat of hijacking.

winforms ean 13 reader

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For example, if your timer event handling code performs a time-consuming task, the user interface will lock up until it s finished Thus, the timer doesn t help you make a user interface more responsive, and it doesn t allow you to collapse the waiting time for high-latency operations To get this functionality, you need the real multithreading discussed in this chapter However, clever use of the DispatcherTimer can achieve the effect you need in some situations For example, the DispatcherTimer is a great way to periodically check a web service for new data As you learned in 13, all web service calls are asynchronous, and are carried out on a background thread Thus, you could use the DispatcherTimer to create an application that periodically downloads data from a slow web service.

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Listing 5-17. Implementing the InitiatorService public class InitiatorService : Service { public InitiatorService(SqlConnection Connection) : base("InitiatorService", Connection) { WaitforTimeout = TimeSpan.FromSeconds(1); } public static void ServiceProcedure() { Service service = null; SqlConnection cnn = null; try { cnn = new SqlConnection("context connection=true;"); cnn.Open(); service = new InitiatorService(cnn); service.FetchSize = 1; service.Run(true, cnn, null); } catch (ServiceException ex) { if (ex.Transaction != null) ex.Transaction.Rollback(); } finally { if (cnn != null) cnn.Close(); } } [BrokerMethod("http://ssb.csharp.at/SSB_Book/c05/ResponseMessage")] public void ProcessResponseMessage( Message ReceivedMessage, SqlConnection Connection, SqlTransaction Transaction) { ReceivedMessage.Conversation.End(Connection, Transaction); } [BrokerMethod(Message.EndDialogType)] public void EndConversation( Message ReceivedMessage, SqlConnection Connection, SqlTransaction Transaction) { ReceivedMessage.Conversation.End(Connection, Transaction); }

For example, it might fire every five minutes and then launch the web service call asynchronously, allowing the timeconsuming download to take place on a background thread..

Summary

Note The name of the DispatcherTimer refers to the dispatcher, which controls the main application

winforms ean 13 reader

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public void ProcessErrorMessage( Message ReceivedMessage, SqlConnection Connection, SqlTransaction Transaction) { ReceivedMessage.Conversation.End(Connection, Transaction); } } As soon as you develop the InitiatorService class, you can deploy the assembly again to the SQL Server 2005 database and activate the internal activation on the InitiatorQueue, as shown in Listing 5-18. Please make sure to point to the correct path where you ve built the assembly. Listing 5-18. Deployment of the Managed Assembly -- Add the assembly file to the database CREATE ASSEMBLY InitiatorServiceAssembly FROM 'c:\InitiatorService.dll' GO -- Add the debug information to the assembly ALTER ASSEMBLY InitiatorServiceAssembly ADD FILE FROM 'c:\InitiatorService.pdb' GO -- Register the stored procedure written in managed code CREATE PROCEDURE ProcessRequestMessagesManaged AS EXTERNAL NAME InitiatorServiceAssembly.InitiatorService.InitiatorService. ServiceProcedure GO -- Use the managed stored procedure for activation ALTER QUEUE InitiatorQueue WITH ACTIVATION ( STATUS = ON, PROCEDURE_NAME = ProcessResponseMessagesManaged, MAX_QUEUE_READERS = 5, EXECUTE AS SELF ) GO When you register the managed stored procedure for internal activation, you can use the code from Listing 5-8 to send a message to the Service Broker service. In this case, the ProcessRequestMessagesManaged managed stored procedure starts and processes the messages arriving in the TargetQueue. This stored procedure sends a response message back to the InitiatorService, where the ProcessResponseMessages managed stored procedure starts and finally ends the dialog between the two services.

In 6, we continued our discussion of script vulnerabilities, focusing here on protecting temporary files. We began with a discussion of the importance of temporary files, including their locations, their permanence, and the risks they present, both for exposing your private data and for presenting an opportunity for an attacker to hijack your file and substitute one of his own. After an example of such an exploit, we turned to discussing various ways to prevent such abuse: securing network connections, creating unguessable filenames, restricting permissions, and writing to and reading from known files only. Finally, we provided a model for a test of your protection against attempts to hijack temporary files. In 7, we will move on to the last stage in our survey of ways to keep your application scripts as secure as possible; there we will discuss securing scripts in order to prevent session hijacking.

winforms ean 13 reader

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