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Writing a Perl extension is seen by many as a black art, only to be conducted by senior programmers in the recesses of their programming environments Unlike modules, which only require a modicum of Perl knowledge to create, extensions require not only knowledge of C or C++, but also knowledge of the internals in order to make your extensions work within the Perl interpreter The process of creating an external C extension is actually more straightforward than you think An understanding of the internals of the Perl interpreter is not required, even by a relatively advanced extension programmer You can write complex extensions using a small subset of the range that is available That said, the introductory material provided in this and the previous chapter should prove invaluable to the understanding of the processes and conversions involved Once you are comfortable with the process we ll examine or just because your curiosity gets the better of you you can examine the Perl documentation for more in-depth detail For reference, all the internals of the extension process and of the Perl interpreter itself are in the perlxs, perlxstut, and perlguts man pages For further information, you might also want to refer to the perlcall and perlembed man pages, which contain information on the data interface between Perl and C, as well as details of how to embed a Perl interpreter into your C programs, which is also the next major topic in this chapter The process of developing the interface is made easier by two tools that eliminate much of the complexity involved: one is called the XS interface, and the other is called SWIG The XS interface system is part of the standard Perl distribution and actually refers to the language used to define the interface The Simplified Wrapper and Interface Generator (SWIG) is a third-party system written by Dave Beazley It s also based on an intermediary language that defines the interface between the two language environments You will notice, as we progress through this section, that much of the information here is not actually specific to producing extensions The functions and methods explained will also apply to the process of calling the Perl interpreter from a C program Conversion of information from C variables to the variable types used by the Perl interpreter and, therefore, the Perl language make up the bulk of the information provided, and the processes are vital for either extending or embedding Perl using C and C++. onenote ocr c# exampleRe: Free C# OCR library. Post by odklizec » Tue Oct 23, 2018 10:16 am. Hi, I don't have a use for OCR library, but a quick google search ... best ocr sdk c# OCR using Tesseract in C# - C# Corner
7 Mar 2016 ... In this article I am going to show how to do OCR using Tesseract in C# . . nuget datamatrix net, asp.net pdf 417, pdf to jpg c#, asp.net pdf 417 reader, free excel to pdf converter .net, zxing barcode reader example java best free ocr library c#I wanted to know how to implement those open source OCR libraries to a C# project and how to ..... I'm using tesseract OCR engine with TessNet2 (a C# wrapper .... Some online API's work pretty well: ocr.space and Google Cloud Vision. ... big text document, which you can then open and search through using ITextSharper. tesseract ocr c# nugetYou can use WIA library to control the scanning process and tesseractdotnet for OCR. An updated .NET 4.0 version can be found here. The Perl interpreter has the ability to call external C functions This is the basis of many of the built-in functions When you call a function within Perl, it looks for the definition of the function If it s a Perl function, it just jumps execution of the opcode tree to the start of the function definition If it s a built-in function, it makes a call to the underlying C function, if necessary, or uses one of the data-handling functions you saw at the start of this chapter If the function is neither built in nor a Perl-defined function, then it can be loaded from an external dynamic library The development of an extension, therefore, requires you to build the library that Perl loads in order to execute your customized C function The actual process is slightly more complex than just creating a new function in C and installing it in the Perl directory hierarchy There are some fundamental differences between the format of Perl data types and their C counterparts C, for example, does not by default support hashes, whereas Perl does The development process must also create some code that interfaces between the internals of the Perl interpreter and the internals of a C function This is called glue code, and it solves the two main differences between Perl and C data types and memory management Data types in Perl are actually complex C structures Some of the structure and complexity can be found at the beginning of this chapter where we looked at the different Perl variable types and the functions that enable you to access them Most of the base data types, such as integers and strings, are handled automatically by both XS and SWIG More complex structures and data types, including C structures and Perl objects, must have special typemapping code written for them so that both sides of the interface are able to access and use the information stored within them Perl handles all of its memory management automatically When you create new variables and delete or undefine them, Perl automatically allocates and deallocates the necessary storage for each variable C, on the other hand, expects you to do all of this explicitly For simple variables, this means specifying their size at the initialization stage; but for more complex or large variables, you have to use the calloc() or malloc() function to allocate the memory, and free() to deallocate it when you ve finished In addition, both interfaces solve two further problems that of the specializations available in Perl and the necessary glue code to make the functions work Specializations include the use of objects, packages, and multiple return values, which a Perl programmer takes for granted The glue code is all of the necessary wrapper and interface code that makes a simple C function accessible within Perl. microsoft ocr c# exampleJul 16, 2014 · Aspose.OCR for .NET provides OcrEngine class to extract text from a... ... //The sample code below shows how to use the steps above to run ... ocr sdk for c#.netYou can use Tesseract OCR present in 1. http://sourceforge.net/projects/tesseract-ocr/[^] 2. http://code.google.com/p/tesseract-ocr/[^].
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