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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Introduction</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.fdf.html">FDF</a></div> <div class="next" style="text-align: right; float: right;"><a href="fdf.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.fdf.html">FDF</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="intro.fdf" class="preface"> <h1 class="title">Introduction</h1> <p class="simpara"> Forms Data Format (FDF) is a format for handling forms within PDF documents. You should read the documentation at <a href="http://partners.adobe.com/asn/acrobat/forms.jsp" class="link external">» http://partners.adobe.com/asn/acrobat/forms.jsp</a> for more information on what FDF is and how it is used in general. </p> <p class="simpara"> The general idea of FDF is similar to HTML forms. The difference is basically the format how data is transmitted to the server when the submit button is pressed (this is actually the Form Data Format) and the format of the form itself (which is the Portable Document Format, PDF). Processing the FDF data is one of the features provided by the fdf functions. But there is more. One may as well take an existing PDF form and populated the input fields with data without modifying the form itself. In such a case one would create a FDF document (<a href="function.fdf-create.html" class="function">fdf_create()</a>) set the values of each input field (<a href="function.fdf-set-value.html" class="function">fdf_set_value()</a>) and associate it with a PDF form (<a href="function.fdf-set-file.html" class="function">fdf_set_file()</a>). Finally it has to be sent to the browser with MimeType <i>application/vnd.fdf</i>. The Acrobat reader plugin of your browser recognizes the MimeType, reads the associated PDF form and fills in the data from the FDF document. </p> <p class="simpara"> If you look at an FDF-document with a text editor you will find a catalogue object with the name <i>FDF</i>. Such an object may contain a number of entries like <i>Fields</i>, <i>F</i>, <i>Status</i> etc.. The most commonly used entries are <i>Fields</i> which points to a list of input fields, and <i>F</i> which contains the filename of the PDF-document this data belongs to. Those entries are referred to in the FDF documentation as /F-Key or /Status-Key. Modifying this entries is done by functions like <a href="function.fdf-set-file.html" class="function">fdf_set_file()</a> and <a href="function.fdf-set-status.html" class="function">fdf_set_status()</a>. Fields are modified with <a href="function.fdf-set-value.html" class="function">fdf_set_value()</a>, <a href="function.fdf-set-opt.html" class="function">fdf_set_opt()</a> etc.. </p> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.fdf.html">FDF</a></div> <div class="next" style="text-align: right; float: right;"><a href="fdf.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.fdf.html">FDF</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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