winforms pdf 417 reader

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Last but not least is the NS record. NS is short for name server, and the NS record tells clients which name servers are authoritative (that is, have the official true view) for your domain. Now, in theory, these entries should match the ones listed in the WHOIS record for our domain. Technically this should always be true, and you should ensure your domains follow this best practice. Not doing so won t break anything per se, but it can cause lookup delays and general confusion. An NS record looks like this:

Java SE 6 introduces several new networking features, beginning with the CookieManager class. This class provides a concrete implementation of the CookieHandler class, and works with a cookie store and cookie policy so that HTTP protocol handlers and applications can handle cookies. Because many of the world s users would like to register and access domain names using language-specific characters, the Internet Engineering Task Force s Network Working Group introduced support for internationalized domain names. This support consists of ToASCII and ToUnicode operations that specify how to translate between ASCII and non-ASCII domain names. Java SE 6 supports these operations via an IDN class and its methods. Sun has included a lightweight HTTP server in Java SE 6, which is especially useful in testing web services. The server implementation supports the HTTP and HTTPS protocols. Its com.sun.net.httpserver package contains 17 classes, with HttpServer, HttpsServer, HttpContext, and HttpExchange being the 4 most important classes. Java SE 6 adds new methods to the NetworkInterface class that let you access a physical network interface s hierarchy of multiple virtual subinterfaces, as well as other parameters such as the maximum transmission unit. NetworkInterface s getInterfaceAddresses() method returns a list of InterfaceAddress objects that contain a network interface s IP addresses, broadcast addresses (IPv4), and subnet masks (IPv4) or network prefix lengths (IPv6). Finally, Java SE 6 supports Microsoft s negotiate HTTP authentication scheme. To understand this scheme, you first need to understand HTTP authentication basics. The basics begin with the challenge-response mechanism, credentials, and authentication schemes; continue with the basic, digest, NTLM, and Kerberos schemes; and conclude with GSS-API, SPNEGO, and the negotiate scheme.

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The SUBSTRING function returns a defined chunk of a specified expression. The syntax is as follows: SUBSTRING ( expression, start, length ) The first argument of this function is the character expression that you should use to return a defined chunk. The second argument defines the character starting position of the chunk. The third argument is the length of the character chunk that you want to extract. In this example, assume your application receives a bank account number from a customer. It is your company s policy to only store a masked representation of the bank number, retaining the middle four digits only: DECLARE @BankAccountNumber char(14) SET @BankAccountNumber = '1424-2342-3536' SELECT 'XXXX-' + SUBSTRING(@BankAccountNumber, 6,4) + '-XXXX' Masked_BankAccountNumber This returns: Masked_BankAccountNumber XXXX-2342-XXXX

In this recipe, the SUBSTRING function was used to get the middle four digits from a longer bank account number. The expression in the SUBSTRING function call was the bank account number, followed by the starting position, and then the number of characters to extract.

How well do you understand Java SE 6 s new networking features Test your understanding by answering the following questions and performing the following exercises. (The answers are presented in Appendix D.) 1. In Listing 8-1, what would happen if you placed new URL (args [0]). openConnection ().getContent (); before CookieManager cm = new CookieManager (); Why would it happen 2. Which pair of IDN methods toASCII() or toUnicode() throws IllegalArgumentException if the input string does not conform to RFC 3490 3. Extend MinimalHTTPServer (Listing 8-4) with a second handler that is associated with the /date root URI. Whenever the user specifies http://localhost:8000/date, the server should return an HTML page that presents the current date bolded and centered. Assume the default locale. 4. Extend the network parameters application (Listing 8-5) to obtain all accessible InterfaceAddresses for each network interface. Output each InterfaceAddress s IP address, broadcast address, and network prefix length/subnet mask.

Caution As you can imagine, telling the world that the primary DNS server for example.org is dns0.

A NULL value can be tricky to code around because its value is unknown. SQL Server 2005 provides functions used to handle NULLs in your code, as described in Table 8-4. Table 8-4. NULL Functions

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