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8 May 2018 ... Post summary: How to extract text from PDF in C# . PDF verification ... iTextSharp . iTextSharp is a library that allows you to manipulate PDF files. Figure 111: Unpacked BCD digits The value 31H is a valid BCD value because the low nybble contains 1 BCD is a 4-bit numbering system, and the high nybble (which in the case of 31H contains a 3) is ignored In fact, all of the ASCII digits from '0' through '9' may be considered legal BCD values, because in each case the characters' low 4 bits contain a valid BCD value The 3 stored in the high four bits of each digit is ignored So, if there were a way to perform BCD addition on the 86-family CPUs, adding '1' and '1' would indeed give us '2' because '1' and '2' can be manipulated as legal BCD values AAA (and several other instructions I don't have room to discuss here) gives us that ability to perform BCD math The actual technique may seem a little odd, but it does work AAA is in fact a sort of a fudge factor, in that you execute AAA after performing an addition using the normal addition instruction ADD AAA takes the results of the ADD instruction and forces them to come out right in terms of BCD math AAA basically does these two things: It forces the value in the low 4 bits of AL (which could be any value from 0 to F) to a value between 0 and 9 if they were greater than 9 This is done by adding 6 to AL and then forcing the high nybble of AL to 0 Obviously, if the low nybble of AL contains a valid BCD digit, the digit in the low nybble is left alone If the value in AL had to be adjusted, it indicates that there was a carry in the addition, and thus AH is incremented Also, the Carry flag CF is set to 1, as is the Auxiliary carry flag AF Again, if the low nybble of AL contained a valid BCD digit when AAA was executed, AH is not incremented, and the two Carry flags are cleared (forced to 0) rather than set AAA thus facilitates base 10 (decimal) addition on the low nybble of AL After AL is adjusted by AAA, the low nybble contains a valid BCD digit and the high nybble is 0 (But note well that this will be true only if the addition that preceded AAA was executed on two valid BCD operands! And ensuring that those operands are valid is your responsibility, not the CPU's!). c# parse pdf itextsharp: Extract Text from PDF in C# (100% .NET) - CodeProject c# read pdf to text How to read pdf line by line and fetch the data in c# - C# Corner
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February 27, 2014: This article originally described parsing PDF files using PDFBox. It has been extended to include samples for IFilter and iTextSharp . How to ... The figures for this example show a simple Java framework for pipelines and an example application The framework consists of a base class for pipeline tages, PipelineStage, shown in Fig 427, and a base class for pipelines, LinearPipeline, shown in Fig 428 Applications provide a subclass of PipelineStage for each desired stage, implementing its three abstract methods to indicate what the stage should do on the initial step, the computation steps, and the final step, and a subclass of LinearPipeline that implements its abstract methods to create an array containing the desired pipeline stages and the desired queues connecting the stages For the queue connecting the stages, we use LinkedBlockingQueue, an implementation of the BlockingQueue interface These classes are found in the javautil concurrent package These classes use generics to specify the type of objects the queue can hold For example, new LinkedBlockingQueue<String> creates a BlockingQueue implemented by an underlying linked list that can hold Strings The operations of interest are put, to add an object to the queue, and take, to remove an object, take blocks if the queue is empty The class CountDownLatch, also found in the javautilconcurrent package, is a simple barrier that allows the program to print a message when it has terminated Barriers in general, and CountDownLatch in particular, are discussed in the Implementation Mechanisms design space The remaining figures show code for an example application, a pipeline to sort integers Fig 429 is the required subclass of LinearPipeline, and Fig 430 is the required subclass of PipelineStage Additional pipeline stages to generate or read the input and to handle the output are not shown. extract images from pdf using itextsharp in c#: How to read text on PDF file and Image File using C# ? - C# Corner c# extract text from pdf using pdfsharp Extract text by line from PDF using iTextSharp c# | LuckyWen
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