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to resolve all the problems Each time the user submits the form there will be the usual network and server processing delays A better design is to perform as many validity checks as possible on the client This will improve the responsiveness of the application and produce a better user experience It will also have the benefit of reducing the load on the server Of course, there will always be a costbenefit trade-off when deciding what validations can be done on the client For example, checking that a street address matches a zip code requires a database that is too large to be sent to a client Another excellent use of client-side processing is data presentation For example, consider the result of a database query presented as a multi-column table The user may want to view the data sorted by different columns or as a chart in different styles With client-side processing, the raw data can be sent to the Web browser once and then redisplayed many times according to the user s selections Again, the benefit is improved response time and reduced server load In traditional multi-tiered distributed applications, the presentation tier is called Tier-1, the business logic tier is Tier-2, and the persistence tier is Tier-3 Tier-1 is traditionally a desktop computer with a windowing user interface However, the presentation tier in modern Web applications is in fact physically split between the Web browser client and the Web application server The client side is sometimes referred to as Tier-0, although this term is often used for limited capability wireless devices such as cell phones and PDAs In J2EE parlance, a multi-tiered distributed application is spread over a client tier, a middle tier, and an Enterprise Information System (EIS) tier The client tier is the end-user device such as a desktop computer or cell phone The middle tier consists of several modules such as Web containers and EJB containers The EIS tier consists of databases, Enterprise Resource Planning (ERP) systems, and other legacy applications Refer to section 1211 in Multitier Model of Designing Enterprise Applications with the J2EE Platform, Second Edition [Singh2002], for more details Thus in J2EE, the presentation tier physically consists of the client tier and a Web container on the middle tier WTP currently supports development for a presentation tier that consists of a Web browser on the client tier and a Web container on the middle tier One of the hottest new Web browser technologies is Asynchronous JavaScript and XML (AJAX) In this approach, the Web browser makes asynchronous requests for XML data from the server The use of asynchronous requests means that the user interface is not blocked waiting for the server to respond Instead, when the response is received, a user-supplied callback function is invoked to process the data XML is used here as a data interchange format Clearly, Web services are n important potential source of AJAX data For more information on using AJAX with J2EE, see Asynchronous JavaScript.

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The name "data," however, tells you that it's the data segment The assembler doesn't look for the string "data" and note somewhere that the segment named data is the data segment This is why you could change the preceding line to this: SEGMENT GreasedPig ; Segment containing initialized data Nothing would change GreasedPig is an odd name for a segment, but a completely legal one In MASM, Microsoft defines the ASSUME directive, which associates segment names with segment registers This allows MASM to generate segment prefixes automatically when it creates the opcodes called out by a particular mnemonic in your source code This is a tricky and subtle business, so to make this clearer imagine a memory variable defined in a segment that is addressed via ES: SEGMENT JunkSegment JunkChunk DW 0FFA7H At the beginning of the program, you have to make sure ES is loaded with the segment address of JunkSegment: MOV AX, JunkSegment ; Load segment address of JunkSegment into ES via AX MOV ES, AX Ordinarily, using NASM, you have to specify when a piece of memory data is located relative to the ES register, because the default is DS: MOV AX,[ES:JunkChunk] ; Move word variable JunkChunk from JunkSegment (ES) into AX That's the NASM way Using Microsoft's MASM, you can associate a segment name with ES using the ASSUME directive: ASSUME ES:JunkSegment Having associated ES and JunkSegment this way, you could now write the MOV instruction without explicitly including the ES: segment prefix: MOV AX,[JunkChunk] ; Move word variable JunkChunk from JunkSegment (ES) into AX Thanks to ASSUME, MASM knows that the variable JunkChunk is located in extra segment ES, so it inserts the ES: prefix behind the scenes as it generates the opcode for this mnemonic Many of us (NASM's authors included) don't think this is a particularly good idea It makes the source code less specific and hence less readable-a person not familiar with the program might assume (heh-heh) that JunkChunk is in the data segment associated with DS because there's no ES: prefix and DS is the default for memory variable references like that So, NASM has nothing like ASSUME When you move away from the default addressing of memory variables relative to DS, you must include the segment register prefix inside the square brackets of all memory variable.

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QR Bar Code Printer In .NET Using Barcode encoder for Visual . Read QR Code In VS .NET Using Barcode recognizer for .A fundamental truth about graphic files on the Web is that hey have weight. Weight, in the context of an HTML5 page, refers to file size measured in terms of the number of pixels stored in an image. Generally speaking, larger and higher-quality images have more pixels. The consequence of size for the Web is that heavier graphics take longer to move over the Internet and load into an HTML page. If you ve ever stared at a Web page waiting for a big graphic to load, you know that it can be frustrating and cause your mouse button finger to start twitching, wanting to hit the Back button on the browser. By understanding something about the different file types and how to optimize their size, you can better adjust the files and get the most out of images on your page both in terms of how they look and how long they take to load.Related: Create EAN-8 .NET , Print UPC-E .NET , .NET ISBN Generator

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Here, however, is a problem: The print command has no way to display anything that won't fit in a character or integer value, so strings can't be displayed that way Instead, you must display nullterminated string variables with the x command (think "examine"), which is intended for use in examining memory Program variables exist in memory, and hence can be displayed with the x command Here's a typical use of the x command to display a string variable: (gdb) x /s &eatmsg As with the print command, the format codes are placed first, preceded by a slash symbol (/) The name of the variable follows, preceded by an ampersand (&) C programmers will recognize the use of the ampersand here: It's the "address of" operator in C In C, the expression &eatmsg would return the address of the variable eatmsg That's just what we're doing here: We're handing the x command the address of the variable eatmsg, so that it can display memory starting at that address Note that values displayed by the x command are not retained in the value history! The format code s indicates that the x command should treat memory as a null-terminated string Starting with the address indicated by &eatmsg, x will then display memory as a null-terminated string Table 121 shows the various format codes available for use with the x command Note that two of the format codes, s and I, are available only with the x command Print does not support them You can use the address-of operator with the print command to determine the memory address of a program variable To isplay the address of a variable named seconds, you would issue this command: (gdb) print &seconds.

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