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The Best iText Questions on StackOverflow。StackOverflow上对itext常见文件解答
This book is written by a developer for developers It is dedicated to all the developers who take pride in writing good code Contents introduction Why StackOverflow Acknowledgments How to use this book? Questions about PDF in general 4 What is the difference between iText, Jasper Reports and Adobe lc? 4 Does a PdF file have styles, headers and footers? Getting started How to create a complex pdF document ext or iTexLSharp? How to generate and design PDFs with ite How to set the page size to Envelope size with Landscape orientation? Fonts 11 How to use the font Verdana in PdfStamper? Why doesnt FontFactory. GetFont( work for all fonts? 12 Why arent my fonts getting registered? mages 15 Why arent images added sequentially? How to get the image dPi in PDF? 16 How to preserve high resolution images in PDF? Absolute positioning of text 19 How to write a Zapldingbats character at a specific location on a page? How to reduce redundant code when adding content at absolute positions? 20 Why does Column Text ignore the horizontal alignment? 22 Tables 24 How to right-align text in a pdfPCel1? 24 How to use multiple fonts in a single cell? ··· 25 How to introduce a rowspan 27 How to change width of single column of table? 28 What is the pdfPTable Defaultcell property used for? CONTENTS How to draw a borderless table in iTextSharp Why doesnt getDefaultCell(). setBorder(PdfPCell NO-_BORDER)have any effect? Table events 32 How to use a dotted line as a cell border? 32 How to create a table with rounded corners? 33 Page events How to add a rectangle to every page of a document 35 35 How can I add an image to all pages of my PDF? 36 How to set a fixed background image for all my pages? 38 Parsing XML and XHTML 40 How to add external CSS while generating PDE? Why is it so difficult to convert XML to PDF 40 41 How to do html to XML conversion to generate closed tags? 42 Inspect a pdf with iText 44 Why do i get an InvalidPdfException: PDF header signature not found"? 44 How to Get pdf page width and height? Manipulating existing PDFS 46 How to update a pdf without creating a new pdF? 46 How to add an image watermark to a PDF file? 47 Why does the function to concatenate/ merge PDFs cause issues in some cases? How to merge documents correctly? 50 Interactive forms 54 How to fill out a pdf file programmatically?(Acro Form technology) 54 How to fill out a pdf file programmatically?(Dynamic XFA) 55 How to fill XFA form using iText without breaking usage rights? 57 Actions and annotations 59 How to create a link to a specific page number? How to insert a linked rectangle " with iText? 60 How to add a maps with a pointer to a pdF? 61 Extracting text from PDFs 64 How to read text from a specific position? General questions about iText 66 Unit Testing and Automated Testing Questions 66 Why do i get a Could not find PdfGraphics2D"error? 67 Why do i get a getOutputstream()has already been called for this response error in JSP? 68 CONTENTS Legal questions 70 What is the difference between Lowagie and iText? 70 Can iText 2. 1.7 or earlier be used commercially? 71 To be continued 74 introduction A couple of years ago, I decided to self-publish new books about iText, as opposed to working with a publisher as i did before for the iText in Action books. This led to a book about digital signatures that is available for download' on the iText site, and a book called The abC of PDF published on LeanPub The goal of The abC of PDF was to start with a book that looks at pdf at the lowest level, examining the syntax of a PDF file and a Pdf page, and then to continue writing a series of books that explain how to use iText on a higher level, answering questions such as How to create a pdf from scratch? How to create PDf from hTmL? How to fill out pdf forms? How to parse a pdf file? However, in spite of the fact that more than 15,000 people downloaded The abc of pdF it turned out that people really wanted me to write a different kind of book I' ve received many comments through Lean Pub from people who were disappointed that the abc-book didnt explain how to use iText. They expected a book with more practical examples, instead of examples that helps them understand the PDF specification. Some people even used the feedback form to ask me technical questions. Unfortunately, I was unable to answer these questions, because the people posting them didnt realize that i received these questions anonymously. Even if i knew the answers, I didnt know who or where to send them to All of this faced me with a dilemma: do i stop writing The ABC of PDF"and start writing one of he other books that were planned? If so, which part of iText is most important to iText users? The plan for the abc was to write a book of about 150 pages, but much to my surprise, I was only half way when i finished writing page 150. Didnt I have other writing priorities Then suddenly I had an idea: why not write a book with questions and answers? Why not create a book entitled The Best iText Questions on StackOverflow? Why Stackoverflow? joined StackOverflow on August 24, 2012. Up until then, I had been answering many questions on the iText mailing-list. This mailing-list hosted on Source Forge used to be an important source http:/itextpdf.com/'book/digitalsignature https://leanpub.com/itext_pdfabc/ introduction of inspiration. I composed two "iText in Action" books for Manning Publications, simply b reorganizing the many answers and examples written in answer to question into a real book However, at some point I got tired of the mailing-list. When i referred to an example in one of my books, people would accuse me for trying to trick them into buying my book. The mailing-list was also used by people spreading false allegations, such as iText is no longer open source. One could explain that these people were wrong for instance by providing a link to the source code but there was no way to award people for providing good answers and to discourage people from posting bad answers. It felt as if the ungrateful were winning the debate Then I discovered StackOverflow. where people build a reputation getting reputation points when they ask good questions and provide good answers, losing points when they post bad questions or bad answers. I took me 2 years and almost 2 months to become a Trusted User, a status that requires 20,000 reputation points. Since i registered on StackOverflow, i have posted answers to more than 1,000 questions. Looking back at some of the more elaborate answers, I thought it would be a good idea to bundle those questions and answers that are of book quality Acknowledgments I have selected nothing but questions I have answered myself,, but it goes without saying that I cant answer every single question about iText personally. For instance: when I am travelling, I am off-line for many hours. As unanswered questions about iText give me stress, I am always happy to see that other people jump in when I'm away from my keyboard I want to thank alexis Pigeon for editing many iText questions in order to clarify what is asked. I rely on Chris Haas for answering questions that require the C# skills that I am missing. I notice that I skip questions about digital signatures, because I know that michael Klinks answer will be much more accurate than mine I also want to thank the many people who accepted one of my answers, because that's how one builds a reputation on StackOverflow. i know that some people down-vote me because my style can be harsh at times. Somebody once tweeted: Spent a lot of time today on stackOverflow and realized that bruno lowagie is kind of a dick Ah well, I hope that the balance is positive Please understand that it is hard for me when people talk about "Lowagie"as if it's a thing, not a person. Sometimes people start by saying that they are using "Lowagie software"and then they start cursing at me ifI give them an answer they dont like, for instance: please use a more recent version instead of a version that has been declared"End of Life more than five years ago. So it goes.. Not every developer realizes that Im on their side and that their job is much easier if only their boss would purchase a commercial iText license so that they can use the most recent version httpsi/github.com/itext/itextpdf http:/istackoverflow.com http://stackoverflow.com/users/1622493/bruno-lowagie introduction How to use this book? Ive tried organizing the questions and answers in different categories. This wasnt always simple If somebody asks a question about adding an image to a table, should this question be categorized under images"or under tables"? If there's a question about Xhtml content that needs to be added o a column, is that an XML or aColumnText question? a book isnt a web site where you can easily introduce a taxonomy. That's why i took great care when creating the table of contents In many cases, I rephrased the original question so that you understand what a question is about at a glance, just by browsing the bookmarks. In some cases, I even had to rewrite the question All the questions are marked with a question mark icon like this this is a question At times, I throw in a question of myself to clarify things. These questions are marked with an intormation ico This is an extra question added by myself Sometimes, it was important to add a comment that was made on StackOverflow. I have marked comments like this: This is a comment a question on StackOverflow and, who knows, maybe your question will be added to this boof st I hope you enjoy this book, and that it helps you solving all your iText problems. If not, please po http://stackoverflow.com Questions about PDF in general When posting a question on StackOverflow, people can tag their posts as iText or iTextSharp questions. This allows me to quickly find those questions by performing a simple query for posts lagged as itext* questions. This includes the tags itext, itextsharp, itextpdf and itext However, not all questions tagged this way are iText-related. Sometimes, people using iText have questions that are about PDF in general What is the difference between iText, JasperReports and adobe lc? Actually i want to know the difference or comparison between different PDF creation / generation techniques. For Example: iText, Adobe LC, Jasper Reports, etc i would like to know the exact advantage /disadvantage of using each of them Currently I am using Adobe LC ES2 and would like to also know the advantage of using Adobe software over other techniques Posted on StackOverflow on Mar 19, 2013 by user2185226% Thats a very broad question and i see Chat it already has a vote to close the question for this reason Let me give the nutshell version of the answer. i could easily write a book on this topic(and maybe one day i will iText is a library that can be used by developers to enhance their web and other applications with PDF functionality: create PDF, fill out PDF formS, examine and manipulate existing PDF JasperReports is a Business Intelligence/Reporting tool that uses an old itext version to create reports. It is distributed by Jasper Soft/ TIBCO. Jasperreports only uses a limited part of the complete iText functionality. Creating PDF is just one of many features of JasperReports, and Jasper Soft uses iText to implement that feature http:/istackoverflow.com/questions/tagged/itext http:/istackoverflow.com/questions/15492738,difference-between-itext-and-adobe-lc http:/istackoverflow.com/users/2185226/user2185226

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The Best iText Questions on StackOverflow

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