c# convert pdf to tiff: Adding signature to pdf file SDK software project winforms windows asp.net UWP Patel

•

Simple

•

Distributed

•

Multithreaded

•

Dynamic

•

Portable

•

Secure

•

High performance

Java code is written in any of the plain text file and this text file saves as .java

extension. Created java file run by .class file through java complier and .class file is nothing

but it is store the byte code to understand the machine language. After the compilation Java

need java virtual machine to run the application because java virtual machine is deploy on

any of operating system like as Microsoft operating system, Mac operating system, Solaris

operating system and Linux operating system.

Figure 3.5 [18] describe the overview of the software development process for java

language.

Figure 3.5. Overview of the software development process the java tutorial.

Source: J

AVA

, About the Java technology. Java,

http://docs.oracle.com/javase/tutorial/getStarted/intro/definition.html, accessed

February 2012, n.d.

3.5

AVA

LATFORM

Platform is the environment in which software and hardware runs. Java platform is

different from all other platforms because it is software based platform and can run on any

other hardware-software platforms.

There are 2 components of Java platform:

1. Java Virtual Machine (JVM)

Adding signature to pdf file - C# PDF File Permission Library: add, remove, update PDF file permission in C#.net, ASP.NET, MVC, WPF

Tell C# users how to set PDF file permissions, like printing, copying, modifying, extracting, annotating, form filling, etc

export pdf to word sign in; add signature to pdf

Adding signature to pdf file - VB.NET PDF File Permission Library: add, remove, update PDF file permission in vb.net, ASP.NET, MVC, WPF

VB.NET Tutorial for How to Set PDF File Access Permissions Using XDoc.PDF for .NET

adding signature to pdf form; add signature block to pdf

JVM is base for the java platform and runs onto the various hardware-based

platforms.

2. Java Application Programming Interface ( Java API)

The API is the collection of different software components and it provides useful

capabilities. It is combined in to classes and interfaces which is known as the

package.

Android SDK includes many java libraries likes data structure, math libraries,

graphics, networking and android libraries which supports rich android application

development.

C# PDF Digital Signature Library: add, remove, update PDF digital

Help to Improve the Security of Your PDF File by Adding Digital Signatures. Overview. Add a signature or an empty signature field in any PDF file page.

adding a signature to a pdf document; add signature box to pdf

VB.NET PDF Library SDK to view, edit, convert, process PDF file

Capable of adding PDF file navigation features to your VB.NET Password, digital signature and PDF text, image and page to a specific location on PDF file page.

add signature field to pdf; pdf converter sign in

CHAPTER 4

PROJECT IMPLEMENTATION

This chapter will give the detailed information about internal structure of PDF file. It

will also cover some basic introduction of open source library that is widely used to parse the

PDF file. Later part of the chapter covers project implementation details with screen shots.

4.1

NTERNAL

TRUCTURE OF

PDF

PDF document consists of three layers. The lowest layer contains data for the

document. The next above layer is the COS layer and it contains the simple independent

object. The top most layers is called PD layer and this layer combines all the independent

objects together to implement the structure like images, fonts and paragraphs. All the layers

have their own independent rules. PDF file is created with some text and binary data. It also

contains direct and indirect objects. PDF documents support basic seven types of objects as

described below:

•

Booleans : Always in form of two values - True and False

•

Streams : Contains images, page contents and embedded fonts

•

Arrays : Contains the list of all the objects

•

Strings: Describe the sequences of characters

•

Names : It is predefined value in a PDF document, and typically used as a key in a

dictionary

•

Dictionaries : Contains the map of name-value pair

•

Numbers: Supports two types of numbers - integer and real. Integer numbers are

described by signed and unsigned constants whereas; real numbers are described by

decimal format

Figure 4.1 [4] indicates the PDF file document structure on client side.

PDF file description uses various levels of contents such as interactive online view

and copy image on printer side. Lowest level of the page structure is the object which is used

to create the documents. There are seven types of the objects used in the PDF file format

such as array, Boolean, numbers, dictionary, string, Stream and name. Middle level of the

C# PDF insert image Library: insert images into PDF in C#.net, ASP

to insert and add image, picture, digital photo, scanned signature or logo this technical problem, we provide this C#.NET PDF image adding control, XDoc

pdf to word converter sign in; add signature to preview pdf

VB.NET PDF Digital Signature Library: add, remove, update PDF

VB.NET Programmers to Improve the Security of Your PDF File by Adding Digital Signatures in Add a signature or an empty signature field in any PDF file page.

create pdf signature box; click to sign pdf

Figure 4.1. PDF document structure at client side. Source: K.

HOMAS

, Portable

document format: An introduction for programmers. MacTech,

http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html,

accessed January 2012, n.d.

page structure is PDF file structure and it is used to store and retrieves the root level of the

objects. Higher level of the page structure is the document structures which are organized

into pages, index, chapter, sections, etc.

PDF file structure is divided into four major parts:

•

Header

•

Body

•

Cross reference table

•

Trailer

Figure 4.2 [4] describes the physical structure of PDF file with four major parts

4.1.1 Header

Header is the first part of PDF document. Header describes the version of the PDF

and is written in the PostScript style. For example, if the PDF file is created in 1.4 versions,

C# HTML5 Viewer: Load, View, Convert, Annotate and Edit PDF

C# .NET provides permanent annotations adding feature, all to PDF, including freehand signature, text and date signature. load and save it to current PDF file.

adding a signature to a pdf file; pdf sign in

C# HTML5 Viewer: Load, View, Convert, Annotate and Edit PowerPoint

users can convert PowerPoint to PDF (.pdf) online, convert and edited on PowerPoint file just by Users can perform text signature adding, freehand signature

create pdf signature; pdf sign

Figure 4.2. PDF physical structure of PDF file. Source:

HOMAS

Portable document format: An introduction for programmers.

MacTech,

http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/ind

ex.html, accessed January 2012, n.d.

then the header of the document is “% PDF-1.4". Header can change based on the version

used to create PDF file.

4.1.2 Body

Body is the second part of the PDF file. The PDF body contains different types of

objects like integer, Boolean, string, dictionary, images, graphics. We can put images, text,

values in any of the order. User can easily implement the logical structure in a body with the

use of objects. User can also give the security of the document by implementing the security

features within the body. User can protect the contents from the unauthorized editing,

printing, and viewing [19]. Body part of the PDF structure also supports two values - one is

integer and second is real numbers. Figure 4.3 shows the example of the body of the PDF

files structure.

C# Create PDF Library SDK to convert PDF from other file formats

generated PDF file. What's more, you can also protect created PDF file by adding digital signature (watermark) on PDF using C# code.

adding a signature to a pdf; add jpg signature to pdf

.NET PDF SDK - Description of All PDF Processing Control Feastures

Add signature image to PDF file. PDF Hyperlink Edit. Support adding and inserting hyperlink (link) to PDF document; Allow to create, edit, and remove PDF bookmark

add signature pdf preview; add a signature to a pdf file

Figure 4.3. Example of body.

4.1.3 Cross Reference Table

Cross reference table is the third component of the PDF file structure. It is easy to

access any object by its ID number thus, there is no need to read whole document. A PDF file

contains one cross reference table and this table further contains one or more sections. The

cross reference table changes according to any change in the document. The cross reference

table starts with one keyword “xref”. The address of the object is 20 byte long and it is

included at the end of line. Figure 4.4 shows the example of the cross reference table.

Figure 4.4. Example of cross reference table.

Figure 4.4 describes that each cross reference starts with two header numbers. The

first number indicates the object number of the first entry in the subsection and the second

number indicates number of entry in the subsection for example in “21 3”: 21 is the object

number of the document and 3 is the number of entries of that particular object. There are

XDoc.HTML5 Viewer for .NET, All Mature Features Introductions

to search text-based documents, like PDF, Microsoft Office typing new signature, deleting added signature from the After adding such a control button, with a

add signature to pdf in preview; pdf signature

VB.NET TIFF: Add New Image to TIFF File in Visual Basic .NET

you want to copy an image, graphics, signature or logo the reliable and extensive TIFF page image adding tool that new image, stamp or any photo file to target

adding signature to pdf in preview; sign pdf online

two types of entries in the object, out of which, one is used and the other one is not used. In

the object, the first 10 digits of the number represent the byte offset and they specify the

numbers of bytes from the beginning of the file. These numbers are separated from the

generation numbers by the single name space. [20]

4.1.4 Trailer

Trailer is the last part of the PDF document structure and it contains the link to the

cross reference table as well as some other object link. User can easily find a particular object

from this trailer. The page navigation part is also stored in this section so that user can easily

navigate the page.

Trailer

<</Info 6 0 R/Size 7/ID /Root 5 0 R>>

startxref

467783

%%EOF

The PDF file always ends with %%EOF and it identifies the end of the PDF file. The

PDF file may not be processed without this line. Last line must be there in the trailer part.

Startxref is a point to cross reference table and below the startxref line is starting address of

the cross references table.

4.2

PACHE

PDFB

Apache PDFBox is widely used in web based word to PDF converter applications. It

is an open source java tool and widely used to handle different PDF operations. We can

create new PDF document and manipulate an existing PDF document using the Apache

PDFBox library. It also includes command line utilities and depends on a few external

libraries.

Three main components of PFDBox are pdfbox , FontBox and JempBox. The

FontBox and JempBox components are standalone libraries and used to manage font

information and XPM meta data. These both components have no dependencies and can be

used by adding jar files in the classpath. The main component of this tool is pdfbox and it is

depended on fontbox and jempbox.

Below snippet shows declaration of PDFBox Maven dependency:

<groupId>org.apache.pdfbox</groupId>

<artifactId>pdfbox</artifactId>

</dependency>

Some of the features of PDFBox are dependent on optional extended libraries and we

need to add those libraries in the classpath. One of the most useful features is PDF

encryption. We can include bcmail and bcprov libraries in our application using Maven

dependencies. [21]

<groupId>org.bouncycastle</groupId>

<artifactId>bcprov-jdk16</artifactId>

</dependency>

<groupId>org.bouncycastle</groupId>

<artifactId>bcmail-jdk16</artifactId>

</dependency>

The other useful optional feature is bidirectional language like Arabic. PDFBox uses

the ICU4J library form the international components for Unicode (ICU) project to support

such languages in PDF format.

4.3

MPLEMENTATION

I have used the iText PDF and POI API for converting word to PDF file. iText PDF

API is used for writing any data into PDF file and POI API used to read the content from

word file.

4.3.1 iTextPDF

iText is a PDF library. We can create a PDF file programmatically using a iText API.

This API supports more features related to PDF format such as generating the documents,

add bookmarks, page numbers, adding watermark, split and concatenate pages from existing

document and more. Any contains are not specified before, the contains describe by the

users so we need iTextPDF API. Basically iText API is not the end user tool, we have to

build iText API in application so we can automate the PDF creation. It is hard to create a

PDF file manually if there are so many pages in the original document so in this case we can

use API to convert it into the PDF. [22]

Figure 4.5 describe the overview of the functionality users can do with PDF file. User

can create PDF documents using high level objects and use PDF writer to achieve it. Low

level functionality PDFContentByte class consists of series of methods which is use to draw

arcs, circle, rectangles and more. iText is not a PDF viewer, but the PDFReader class can

give us access to the objects that form a PDF document. Users need a PDFReader class to

access or read the existing PDF document. The PDFStamper class contains page numbers, a

watermark, fill the form and so on. User can split and merge PDF documents with PdfCopy,

PdfSmartCopy, PdfCopyFields, and even using PdfImportedPage objects in combination

with PdfWriter or PdfStamper. iText can also be used to sign existing PDF documents, as

well as to encrypt them. [22]

4.3.2 AndroidManifest.xml

Each android application starts with AndroidManifest.xml. All the Android

application should have AndroidManifest.xml file. This file is the root directory of the

application. This file contains the entire java packages name with their unique name which is

used in whole application. AndroidManifest.xml also describes the components of the

android application such as activities, services, broadcast receivers and more. This file also

allows to give the permission throughout the application which part of the application

interact with the other application. This file also describe the minimum level of the android

API is supported.

In my application I have used AndroidManifest.xml file where there is tag called

<activity> in which we will be specifying the activity's category it lies in category

Figure 4.5. PDF functionality overview. Source:

EXT

PDF, What is iText?

iTextPDF, http://itextpdf.com/itext.php, accessed March 2012, n.d.

LAUNCHER or DEFAULT. Activity which lies under LAUNCHER category will be our

first activity from which application is going to be started and activity in DEFAULT category

will be the usual activities which is in turn launched afterwards.

<activity

android:name="com.action.MainActivity.WordToPDFConverterActivity"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

<activity

android:name="com.action.business.FileChooser"

android:label="@string/app_name" >

Launcher

Documents you may be interested

c# convert pdf to tiff : Adding signature to pdf file SDK software project winforms windows asp.net UWP Patel_Devang3-part386