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<!DOCTYPE html>
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<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/08/15/how-to-rotate-pdf-file-in-linux/">How to Rotate PDF File in Linux</a></h1>
<p class="meta">
<time datetime="2013-08-15T12:10:00+10:00" pubdate data-updated="true">Aug 15<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>pdftk in.pdf cat 1-endS output out.pdf
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/07/26/https/">How Does HTTPS Work?</a></h1>
<p class="meta">
<time datetime="2013-07-26T08:52:00+10:00" pubdate data-updated="true">Jul 26<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>First step is to use public key cryptography.</p>
<ul>
<li>Parties agree on a ‘root’ (small number) and a large prime. This can be in the clear. This is the public key.</li>
<li>Based on a private key and the public key, client and server generate another number. It’s a mixture of the public and private keys. They exchange the mixture in the clear. You can’t work back from the number to the private keys.
<ul>
<li>Using DH key exchange exchange, each party sends (root<sup>secret</sup> % prime).</li>
</ul>
</li>
<li>Each party derives a shared secret from the other party’s mixture. So now they both have the same secret, but they don’t need to send it to each other.
<ul>
<li>Using DH: (otherPartyMixture<sup>mySecret</sup> % prime)</li>
</ul>
</li>
</ul>
<p>Now the parties can communicate using symmetric-key crytography.</p>
<ul>
<li>They agree on a cypher suite - a method of encryption and decryption.</li>
<li>They use the shared secret with the suite.</li>
</ul>
<p>For authentication, the public key needs to be verifyiably attached to a particular party. So with websites, the public key is attached to a domain via a certificate. The client doesn’t need a public key.</p>
<p>TLS is a protocol most often used to implement secure HTTP (HTTPS).<br/>
It’s a level below HTTP in the stack.</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/07/11/nlog/">Basics of NLog</a></h1>
<p class="meta">
<time datetime="2013-07-11T11:27:00+10:00" pubdate data-updated="true">Jul 11<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><ul>
<li>You have a separete logger for each class.</li>
<li>You instantiate it using LogManager factory and assign it to a private member field.</li>
</ul>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>using NLog;
</span><span class='line'>
</span><span class='line'>Logger logger = LogManager.GetLogger("MyClassName");</span></code></pre></td></tr></table></div></figure>
<p>To log things other than exceptions:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
<span class='line-number'>17</span>
<span class='line-number'>18</span>
<span class='line-number'>19</span>
<span class='line-number'>20</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="k">using</span> <span class="nn">NLog</span><span class="p">;</span>
</span><span class='line'>
</span><span class='line'><span class="k">public</span> <span class="k">class</span> <span class="nc">MyClass</span>
</span><span class='line'><span class="p">{</span>
</span><span class='line'> <span class="k">private</span> <span class="k">static</span> <span class="n">Logger</span> <span class="n">logger</span> <span class="p">=</span> <span class="n">LogManager</span><span class="p">.</span><span class="n">GetCurrentClassLogger</span><span class="p">();</span>
</span><span class='line'>
</span><span class='line'> <span class="k">public</span> <span class="k">void</span> <span class="nf">MyMethod1</span><span class="p">()</span>
</span><span class='line'> <span class="p">{</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Trace</span><span class="p">(</span><span class="s">"Sample trace message"</span><span class="p">);</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Debug</span><span class="p">(</span><span class="s">"Sample debug message"</span><span class="p">);</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Info</span><span class="p">(</span><span class="s">"Sample informational message"</span><span class="p">);</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Warn</span><span class="p">(</span><span class="s">"Sample warning message"</span><span class="p">);</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Error</span><span class="p">(</span><span class="s">"Sample error message"</span><span class="p">);</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Fatal</span><span class="p">(</span><span class="s">"Sample fatal error message"</span><span class="p">);</span>
</span><span class='line'>
</span><span class='line'> <span class="c1">// alternatively you can call the Log() method </span>
</span><span class='line'> <span class="c1">// and pass log level as the parameter.</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">Log</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="n">Info</span><span class="p">,</span> <span class="s">"Sample fatal error message"</span><span class="p">);</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>In NLog.config:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
</pre></td><td class='code'><pre><code class='xml'><span class='line'><span class="cp"><?xml version="1.0" encoding="utf-8" ?></span>
</span><span class='line'><span class="nt"><nlog</span> <span class="na">xmlns=</span><span class="s">"http://www.nlog-project.org/schemas/NLog.xsd"</span>
</span><span class='line'> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span><span class="nt">></span>
</span><span class='line'>
</span><span class='line'> <span class="nt"><targets></span>
</span><span class='line'> <span class="nt"><target</span> <span class="na">name=</span><span class="s">"logfile"</span> <span class="na">xsi:type=</span><span class="s">"File"</span> <span class="na">fileName=</span><span class="s">"file.txt"</span> <span class="nt">/></span>
</span><span class='line'> <span class="nt"></targets></span>
</span><span class='line'>
</span><span class='line'> <span class="nt"><rules></span>
</span><span class='line'> <span class="nt"><logger</span> <span class="na">name=</span><span class="s">"*"</span> <span class="na">minLevel=</span><span class="s">"Trace"</span> <span class="na">writeTo=</span><span class="s">"{logfile}"</span> <span class="nt">/></span>
</span><span class='line'> <span class="nt"></rules></span>
</span><span class='line'><span class="nt"></nlog></span>
</span></code></pre></td></tr></table></div></figure>
<p>To log as much data as possible about exceptions, including inner exceptions:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="k">try</span>
</span><span class='line'><span class="p">{</span>
</span><span class='line'> <span class="c1">// some code which may throw </span>
</span><span class='line'><span class="p">}</span>
</span><span class='line'><span class="k">catch</span> <span class="p">(</span><span class="n">MyException</span> <span class="n">ex</span><span class="p">)</span>
</span><span class='line'><span class="p">{</span>
</span><span class='line'> <span class="n">logger</span><span class="p">.</span><span class="n">ErrorException</span><span class="p">(</span><span class="s">"Got exception."</span><span class="p">,</span> <span class="n">ex</span><span class="p">);</span>
</span><span class='line'> <span class="k">throw</span> <span class="n">ex</span><span class="p">;</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='xml'><span class='line'><span class="nt"><nlog></span>
</span><span class='line'> <span class="nt"><targets></span>
</span><span class='line'> <span class="nt"><target</span> <span class="na">name=</span><span class="s">"f"</span> <span class="na">type=</span><span class="s">"File"</span> <span class="na">layout=</span><span class="s">"${message}${onexception:EXCEPTION OCCURRED\:${exception:format=ToString,stacktrace,message,method:maxInnerExceptionLevel=5:innerFormat=tostring,stacktrace,message,method}}"</span> <span class="nt">/></span>
</span><span class='line'><span class="nt"></targets></span>
</span><span class='line'>
</span><span class='line'> <span class="nt"><rules></span>
</span><span class='line'> <span class="nt"><logger</span> <span class="na">name=</span><span class="s">"*"</span> <span class="na">writeTo=</span><span class="s">"f"</span><span class="nt">/></span>
</span><span class='line'> <span class="nt"></rules></span>
</span><span class='line'><span class="nt"></nlog></span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/07/03/warm-underware/">How to Ensure Your Underware Is Warm and Toasty and Ready for You in the Morning</a></h1>
<p class="meta">
<time datetime="2013-07-03T11:39:00+10:00" pubdate data-updated="true">Jul 3<span>rd</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>Two ways:</p>
<ul>
<li>Get your spouse to microwave it. Careful about burning if synthetic.</li>
<li>Put it in your dog’s bed. In the morning, excavate from under dog. Your dog will be happy as dogs need a job.</li>
</ul>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/07/03/pdfs/">Notes From Reading iText in Action</a></h1>
<p class="meta">
<time datetime="2013-07-03T10:30:00+10:00" pubdate data-updated="true">Jul 3<span>rd</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>PDFs are not a declarative layout language like XAML. They are a bunch of instructions to a renderer, and a bunch of them are in sequence.</p>
<p>Eg:</p>
<figure class='code'><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class=''><span class='line'>canvas.saveState(); // q
</span><span class='line'>canvas.beginText(); // BT
</span><span class='line'>canvas.moveText(36, 788); // 36 788 Td
</span><span class='line'>canvas.setFontAndSize(BaseFont.createFont(), 12); // /F1 12 Tf
</span><span class='line'>canvas.showText("Hello World"); // (Hello World)Tj
</span><span class='line'>canvas.endText(); // ET
</span><span class='line'>canvas.restoreState(); // Q</span></code></pre></td></tr></table></div></figure>
<h1>Basic steps to create new doc with iText:</h1>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="n">Document</span> <span class="n">document</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Document</span><span class="p">();</span>
</span><span class='line'><span class="n">PdfWriter</span><span class="p">.</span><span class="n">getInstance</span><span class="p">(</span><span class="n">document</span><span class="p">,</span> <span class="k">new</span> <span class="n">FileOutputStream</span><span class="p">(</span><span class="n">filename</span><span class="p">));</span>
</span><span class='line'><span class="n">document</span><span class="p">.</span><span class="n">open</span><span class="p">();</span>
</span><span class='line'><span class="n">document</span><span class="p">.</span><span class="k">add</span><span class="p">(</span><span class="k">new</span> <span class="n">Paragraph</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">));</span>
</span><span class='line'><span class="n">document</span><span class="p">.</span><span class="n">close</span><span class="p">();</span>
</span></code></pre></td></tr></table></div></figure>
<h1>Basic parts of PDF in iText’s object model:</h1>
<ul>
<li>Chunk: smallest thing that can be added to a document. Images get added in a chunk.</li>
<li>Phrases: can be composed of chunks</li>
<li>Paragraph: a phrase with extra properties and new line at the end</li>
<li>List: sequence of paragraphs</li>
<li>Chapter: contains one or more section objects. Inherits from LargeElement.</li>
<li>Section: set a bookmark on this and you get nice little table of contents in reader apps. Inherits from LargeElement.</li>
<li>Anchor: for hypelinks</li>
</ul>
<p>Lower level objects match objects in PDF spec:</p>
<ul>
<li>PdfDicitonary</li>
<li>PdfName</li>
<li>PdfNumber</li>
<li>PdfBoolean</li>
<li>PdfArray</li>
<li>etc…</li>
</ul>
<p>Objects in PDF doc can have direct or indirect references</p>
<ul>
<li>Indirect objects:</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="na">[object number]</span> <span class="m">0</span> <span class="n">obj</span>
</span><span class='line'><span class="p"><<</span>
</span><span class='line'><span class="na">[metadata about object]</span>
</span><span class='line'><span class="p">>></span>
</span><span class='line'><span class="na">[binary content in a stream]</span>
</span><span class='line'><span class="n">end</span> <span class="n">obj</span>
</span></code></pre></td></tr></table></div></figure>
<p>In the PDF doc itself, the main parts are:</p>
<ul>
<li>header</li>
<li>body</li>
<li>cross reference table (like dictionary for objects in the body)</li>
<li>trailer (locates cross reference table)</li>
</ul>
<p>Content layers, numbered 1 to 4:</p>
<ul>
<li>1 and 4 are for direct content</li>
<li>2 and 3 are for higher level objects, like chunks, sections, chapters etc.</li>
<li>1 is the bottom layer - under text and graphhics</li>
<li>4 is the top layer- over text and graphics</li>
</ul>
<h1>Get writer for top layer:</h1>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="n">PdfWriter</span><span class="p">.</span><span class="n">getDirectContent</span><span class="p">()</span>
</span></code></pre></td></tr></table></div></figure>
<p>Get writer for bottom layer:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="n">PdfWriter</span><span class="p">.</span><span class="n">getDirectContentUnder</span><span class="p">()</span>
</span></code></pre></td></tr></table></div></figure>
<h1>Main classes for manipulating Pdf:</h1>
<ul>
<li>PdfWriter</li>
<li>PdfStamper</li>
<li>PdfImportedPage</li>
<li>PdfCopy</li>
</ul>
<h1>Reading docs</h1>
<p>To read PDF doc, use PdfReader. Can tell you high level things about the doc like:</p>
<ul>
<li>pages</li>
<li>rotation of pages</li>
<li>length</li>
<li>whether encrypted</li>
</ul>
<p>Get content stream of the page - the raw stream of the page with underlying PDF syntax:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="kt">var</span> <span class="n">content</span> <span class="n">stream</span> <span class="p">=</span> <span class="n">PdfReader</span><span class="p">.</span><span class="n">GetContentStream</span><span class="p">();</span>
</span></code></pre></td></tr></table></div></figure>
<h1>How to extract a page from PDF:</h1>
<ul>
<li>DON’T attempt to extract a page using the PdfReader.</li>
<li>Pass the PdfReader to a PdfWriter and ask it to copy the page to another PDF.</li>
<li>This will give you a PdfImportedPage object.</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="n">Document</span> <span class="n">document</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Document</span><span class="p">();</span>
</span><span class='line'><span class="n">PdfWriter</span> <span class="n">writer</span> <span class="p">=</span> <span class="n">PdfWriter</span><span class="p">.</span><span class="n">getInstance</span><span class="p">(</span><span class="n">document</span><span class="p">,</span> <span class="k">new</span> <span class="n">FileOutputStream</span><span class="p">(</span><span class="s">"extractPage.pdf"</span><span class="p">));</span>
</span><span class='line'><span class="n">document</span><span class="p">.</span><span class="n">open</span><span class="p">();</span>
</span><span class='line'><span class="n">PdfReader</span> <span class="n">reader</span> <span class="p">=</span> <span class="k">new</span> <span class="n">PdfReader</span><span class="p">(</span><span class="s">"sourceDocument.pdf"</span><span class="p">);</span>
</span><span class='line'><span class="n">PdfImportedPage</span> <span class="n">page</span> <span class="p">=</span> <span class="n">writer</span><span class="p">.</span><span class="n">getImportedPage</span><span class="p">(</span><span class="n">reader</span><span class="p">,</span> <span class="m">1</span><span class="p">);</span>
</span><span class='line'><span class="c1">// do something with it</span>
</span><span class='line'>
</span></code></pre></td></tr></table></div></figure>
<h1>To put a header and footer or stationary on a PDF:</h1>
<ul>
<li>create the stationary in one PDF</li>
<li>import that page</li>
<li>superimpose that page on the target PDF</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
<span class='line-number'>16</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="c1">// open reader with source doc</span>
</span><span class='line'><span class="c1">// open target doc in writer</span>
</span><span class='line'><span class="c1">// create pdfContentByte by calling getDirectContent on the writer</span>
</span><span class='line'><span class="c1">// call addTemplate on the contentByte and feed it the imported page</span>
</span><span class='line'><span class="n">PdfReader</span> <span class="n">reader</span> <span class="o">=</span> <span class="k">new</span> <span class="n">PdfReader</span><span class="o">(</span><span class="s">"stationary.pdf"</span><span class="o">);</span>
</span><span class='line'><span class="n">Document</span> <span class="n">document</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Document</span><span class="o">();</span>
</span><span class='line'><span class="n">PdfWriter</span> <span class="n">writer</span> <span class="o">=</span> <span class="n">PdfWriter</span><span class="o">.</span><span class="na">getInstance</span><span class="o">(</span><span class="n">document</span><span class="o">,</span> <span class="k">new</span> <span class="n">FileOutputStream</span><span class="o">(</span><span class="s">"result.pdf"</span><span class="o">));</span>
</span><span class='line'><span class="n">document</span><span class="o">.</span><span class="na">open</span><span class="o">();</span>
</span><span class='line'><span class="n">PdfContentByte</span> <span class="n">canvas</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="na">getDirectContent</span><span class="o">();</span>
</span><span class='line'><span class="n">PdfImportedPage</span> <span class="n">page</span><span class="o">;</span>
</span><span class='line'> <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="o">;</span> <span class="n">i</span> <span class="o"><=</span> <span class="n">reader</span><span class="o">.</span><span class="na">getNumberOfPages</span><span class="o">();</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span>
</span><span class='line'> <span class="n">page</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="na">getImportedPage</span><span class="o">(</span><span class="n">reader</span><span class="o">,</span> <span class="n">i</span><span class="o">);</span>
</span><span class='line'> <span class="n">canvas</span><span class="o">.</span><span class="na">addTemplate</span><span class="o">(</span><span class="n">page</span><span class="o">,</span> <span class="mi">1</span><span class="n">f</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="mi">1</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="mi">0</span><span class="o">);</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'><span class="n">document</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span><span class='line'><span class="n">reader</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span></code></pre></td></tr></table></div></figure>
<p>Problem with this: annotations are not part of the content stream, they are part of the annotations dictionary.
They are not copied when using PdfImportedPage.</p>
<h1>To stamp a page using PdfStamper:</h1>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="n">PdfReader</span> <span class="n">reader</span> <span class="o">=</span> <span class="k">new</span> <span class="n">PdfReader</span><span class="o">(</span><span class="n">src</span><span class="o">);</span>
</span><span class='line'><span class="n">PdfStamper</span> <span class="n">stamper</span> <span class="o">=</span> <span class="k">new</span> <span class="n">PdfStamper</span><span class="o">(</span><span class="n">reader</span><span class="o">,</span> <span class="k">new</span> <span class="n">FileOutputStream</span><span class="o">(</span><span class="n">dest</span><span class="o">));</span>
</span><span class='line'><span class="n">PdfContentByte</span> <span class="n">canvas</span> <span class="o">=</span> <span class="n">stamper</span><span class="o">.</span><span class="na">getOverContent</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span> <span class="c1">// note: compare to 'getDirectContent()' method on PdfWriter</span>
</span><span class='line'><span class="n">ColumnText</span><span class="o">.</span><span class="na">showTextAligned</span><span class="o">(</span><span class="n">canvas</span><span class="o">,</span> <span class="n">Element</span><span class="o">.</span><span class="na">ALIGN_LEFT</span><span class="o">,</span> <span class="k">new</span> <span class="n">Phrase</span><span class="o">(</span><span class="s">"Hello people!"</span><span class="o">),</span> <span class="mi">36</span><span class="o">,</span> <span class="mi">540</span><span class="o">,</span> <span class="mi">0</span><span class="o">);</span>
</span><span class='line'><span class="n">stamper</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span><span class='line'><span class="n">reader</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span></code></pre></td></tr></table></div></figure>
<p>Generally, use PdfStamper for adding to existing files and PdfWriter for building up files from scratch.</p>
<h1>To concatenate files:</h1>
<ul>
<li>new Document</li>
<li>new PdfCopy with target stream</li>
<li>make new PdfReader for each source doc, iterating through the pages.</li>
<li>call GetImportedPage on the PdfCopy, passing it the reader for each source document.</li>
</ul>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
<span class='line-number'>15</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="n">Document</span> <span class="n">document</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Document</span><span class="o">();</span>
</span><span class='line'><span class="n">PdfCopy</span> <span class="n">copy</span> <span class="o">=</span> <span class="k">new</span> <span class="n">PdfCopy</span><span class="o">(</span><span class="n">document</span><span class="o">,</span> <span class="k">new</span> <span class="n">FileOutputStream</span><span class="o">(</span><span class="s">"targetFile.pdf"</span><span class="o">));</span>
</span><span class='line'><span class="n">document</span><span class="o">.</span><span class="na">open</span><span class="o">();</span>
</span><span class='line'><span class="n">PdfReader</span> <span class="n">reader</span><span class="o">;</span>
</span><span class='line'><span class="kt">int</span> <span class="n">n</span><span class="o">;</span>
</span><span class='line'><span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">files</span><span class="o">.</span><span class="na">length</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span>
</span><span class='line'> <span class="n">reader</span> <span class="o">=</span> <span class="k">new</span> <span class="n">PdfReader</span><span class="o">(</span><span class="n">files</span><span class="o">[</span><span class="n">i</span><span class="o">]);</span>
</span><span class='line'> <span class="n">n</span> <span class="o">=</span> <span class="n">reader</span><span class="o">.</span><span class="na">getNumberOfPages</span><span class="o">();</span>
</span><span class='line'> <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">page</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">page</span> <span class="o"><</span> <span class="n">n</span><span class="o">;</span> <span class="o">)</span> <span class="o">{</span>
</span><span class='line'> <span class="n">copy</span><span class="o">.</span><span class="na">addPage</span><span class="o">(</span><span class="n">copy</span><span class="o">.</span><span class="na">getImportedPage</span><span class="o">(</span><span class="n">reader</span><span class="o">,</span> <span class="o">++</span><span class="n">page</span><span class="o">));</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="n">copy</span><span class="o">.</span><span class="na">freeReader</span><span class="o">(</span><span class="n">reader</span><span class="o">);</span>
</span><span class='line'> <span class="n">reader</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span><span class='line'><span class="o">}</span>
</span><span class='line'><span class="n">document</span><span class="o">.</span><span class="na">close</span><span class="o">();</span>
</span></code></pre></td></tr></table></div></figure>
<p>PdfCopy does not copy forms and some other stuff. See PdfSmartCopy.</p>
<h1>To draw something onto the doc at a particular position:</h1>
<ul>
<li>subclass VerticalPositionMark. It has a draw() method so you can add it to a Document object.</li>
<li>Imprement Draw interface, then wrap class in a chunk so you can add it to Document object.</li>
</ul>
<p>How to get the raw underlying pdf syntax:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='java'><span class='line'><span class="kt">byte</span><span class="o">[]</span> <span class="n">pdfStreamAsText</span> <span class="o">=</span> <span class="n">yourPdfReader</span><span class="o">.</span><span class="na">GetPageContent</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/05/18/windows-creditials/">How to Specify Windows Credentials in Odata Client</a></h1>
<p class="meta">
<time datetime="2013-05-18T17:20:00+10:00" pubdate data-updated="true">May 18<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>This is when you get the 401 challenge trying to access an ODATA feed.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="p"><</span><span class="n">your</span> <span class="n">data</span> <span class="n">context</span> <span class="n">class</span><span class="p">>.</span><span class="n">Credentials</span> <span class="p">=</span> <span class="n">System</span><span class="p">.</span><span class="n">Net</span><span class="p">.</span><span class="n">CredentialCache</span><span class="p">.</span><span class="n">DefaultCredentials</span><span class="p">;</span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/05/11/compress-pdf/">How Compress Pdf in Linux</a></h1>
<p class="meta">
<time datetime="2013-05-11T19:11:00+10:00" pubdate data-updated="true">May 11<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>gs -sDEVICE<span class="o">=</span>pdfwrite -dCompatibilityLevel<span class="o">=</span>1.4 -dPDFSETTINGS<span class="o">=</span>/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile<span class="o">=</span>output.pdf input.pdf
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/04/10/how-to-require-parameterless-constructor-in-generic-classs-definition/">How-to-require-parameterless-constructor-in-generic-class-definition</a></h1>
<p class="meta">
<time datetime="2013-04-10T10:05:00+10:00" pubdate data-updated="true">Apr 10<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='csharp'><span class='line'><span class="k">class</span> <span class="nc">ItemFactory</span><span class="p"><</span><span class="n">T</span><span class="p">></span> <span class="k">where</span> <span class="n">T</span> <span class="p">:</span> <span class="k">new</span><span class="p">()</span>
</span><span class='line'> <span class="p">{</span>
</span><span class='line'> <span class="k">public</span> <span class="n">T</span> <span class="nf">GetNewItem</span><span class="p">()</span>
</span><span class='line'> <span class="p">{</span>
</span><span class='line'> <span class="k">return</span> <span class="k">new</span> <span class="nf">T</span><span class="p">();</span>
</span><span class='line'> <span class="p">}</span>
</span><span class='line'> <span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/04/07/ascetic-acid-content-of-always-fresh-vinegar/">Ascetic Acid Content of Always Fresh Vinegar</a></h1>
<p class="meta">
<time datetime="2013-04-07T16:35:00+10:00" pubdate data-updated="true">Apr 7<span>th</span>, 2013</time>
</p>
</header>
<div class="entry-content"><p>4.0 - 4.4%</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="/blog/2013/04/03/get-most-recent-file-in-bash/">Get Most Recent File in Bash</a></h1>
<p class="meta">
<time datetime="2013-04-03T12:29:00+11:00" pubdate data-updated="true">Apr 3<span>rd</span>, 2013</time>
</p>
</header>
<div class="entry-content"><figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>doSomethingCommand <span class="sb">`</span>ls | tail -n1<span class="err">'</span>
</span></code></pre></td></tr></table></div></figure>
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