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| author | arseny.kapoulkine <arseny.kapoulkine@99668b35-9821-0410-8761-19e4c4f06640> | 2010-07-11 16:27:23 +0000 |
|---|---|---|
| committer | arseny.kapoulkine <arseny.kapoulkine@99668b35-9821-0410-8761-19e4c4f06640> | 2010-07-11 16:27:23 +0000 |
| commit | f9a2dec792d9a52e1b9004793cfca9b0a463049a (patch) | |
| tree | 4a5cf5ded896dd3ea485e01d0c41e2b94b973385 /docs/manual/saving.html | |
| parent | 468399c2eb1a9828310b11caf0c720785fd9c604 (diff) | |
docs: Added generated HTML documentation
git-svn-id: http://pugixml.googlecode.com/svn/trunk@596 99668b35-9821-0410-8761-19e4c4f06640
Diffstat (limited to 'docs/manual/saving.html')
| -rw-r--r-- | docs/manual/saving.html | 473 |
1 files changed, 473 insertions, 0 deletions
diff --git a/docs/manual/saving.html b/docs/manual/saving.html new file mode 100644 index 0000000..e12b31d --- /dev/null +++ b/docs/manual/saving.html @@ -0,0 +1,473 @@ +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> +<title>Saving document</title> +<link rel="stylesheet" href="../pugixml.css" type="text/css"> +<meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> +<link rel="home" href="../manual.html" title="pugixml 0.9"> +<link rel="up" href="../manual.html" title="pugixml 0.9"> +<link rel="prev" href="modify.html" title="Modifying document data"> +<link rel="next" href="xpath.html" title="XPath"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> +<table width="100%"><tr> +<td>pugixml 0.9 manual | + <a href="../manual.html">Overview</a> | + <a href="install.html">Installation</a> | + Document: + <a href="dom.html">Object model</a> · <a href="loading.html">Loading</a> · <a href="access.html">Accessing</a> · <a href="modify.html">Modifying</a> · <b>Saving</b> | + <a href="xpath.html">XPath</a> | + <a href="apiref.html">API Reference</a> | + <a href="toc.html">Table of Contents</a> +</td> +<td width="*" align="right"><div class="spirit-nav"> +<a accesskey="p" href="modify.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../manual.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../manual.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="xpath.html"><img src="../images/next.png" alt="Next"></a> +</div></td> +</tr></table> +<hr> +<div class="section"> +<div class="titlepage"><div><div><h2 class="title" style="clear: both"> +<a name="manual.saving"></a><a class="link" href="saving.html" title="Saving document"> Saving document</a> +</h2></div></div></div> +<div class="toc"><dl> +<dt><span class="section"><a href="saving.html#manual.saving.file"> Saving document to a file</a></span></dt> +<dt><span class="section"><a href="saving.html#manual.saving.stream"> Saving document to C++ IOstreams</a></span></dt> +<dt><span class="section"><a href="saving.html#manual.saving.writer"> Saving document via writer interface</a></span></dt> +<dt><span class="section"><a href="saving.html#manual.saving.subtree"> Saving a single subtree</a></span></dt> +<dt><span class="section"><a href="saving.html#manual.saving.options"> Output options</a></span></dt> +<dt><span class="section"><a href="saving.html#manual.saving.encoding"> Encodings</a></span></dt> +</dl></div> +<p> + Often after creating a new document or loading the existing one and processing + it, it is necessary to save the result back to file. Also it is occasionally + useful to output the whole document or a subtree to some stream; use cases + include debug printing, serialization via network or other text-oriented medium, + etc. pugixml provides several functions to output any subtree of the document + to a file, stream or another generic transport interface; these functions allow + to customize the output format (see <a class="xref" href="saving.html#manual.saving.options" title="Output options"> Output options</a>), and also perform + necessary encoding conversions (see <a class="xref" href="saving.html#manual.saving.encoding" title="Encodings"> Encodings</a>). This section documents + the relevant functionality. + </p> +<p> + The node/attribute data is written to the destination properly formatted according + to the node type; all special XML symbols, such as < and &, are properly + escaped. In order to guard against forgotten node/attribute names, empty node/attribute + names are printed as <code class="computeroutput"><span class="string">":anonymous"</span></code>. + For proper output, make sure all node and attribute names are set to meaningful + values. + </p> +<div class="caution"><table border="0" summary="Caution"> +<tr> +<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../images/caution.png"></td> +<th align="left">Caution</th> +</tr> +<tr><td align="left" valign="top"><p> + Currently the content of CDATA sections is not escaped, so CDATA sections + with values that contain <code class="computeroutput"><span class="string">"]]>"</span></code> + will result in malformed document. This will be fixed in version 1.0. + </p></td></tr> +</table></div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="manual.saving.file"></a><a class="link" href="saving.html#manual.saving.file" title="Saving document to a file"> Saving document to a file</a> +</h3></div></div></div> +<a name="xml_document::save_file"></a><p> + If you want to save the whole document to a file, you can use the following + function: + </p> +<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save_file</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">path</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +</pre> +<p> + This function accepts file path as its first argument, and also three optional + arguments, which specify indentation and other output options (see <a class="xref" href="saving.html#manual.saving.options" title="Output options"> Output options</a>) + and output data encoding (see <a class="xref" href="saving.html#manual.saving.encoding" title="Encodings"> Encodings</a>). The path has the target + operating system format, so it can be a relative or absolute one, it should + have the delimiters of target system, it should have the exact case if target + file system is case-sensitive, etc. File path is passed to system file opening + function as is. + </p> +<a name="xml_writer_file"></a><p> + <code class="computeroutput"><span class="identifier">save_file</span></code> opens the target + file for writing, outputs the requested header (by default a document declaration + is output, unless the document already has one), and then saves the document + contents. If the file could not be opened, the function returns <code class="computeroutput"><span class="keyword">false</span></code>. Calling <code class="computeroutput"><span class="identifier">save_file</span></code> + is equivalent to creating an <code class="computeroutput"><span class="identifier">xml_writer_file</span></code> + object with <code class="computeroutput"><span class="identifier">FILE</span><span class="special">*</span></code> + handle as the only constructor argument and then calling <code class="computeroutput"><span class="identifier">save</span></code>; + see <a class="xref" href="saving.html#manual.saving.writer" title="Saving document via writer interface"> Saving document via writer interface</a> for writer interface details. + </p> +<div class="note"><table border="0" summary="Note"> +<tr> +<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td> +<th align="left">Note</th> +</tr> +<tr><td align="left" valign="top"><p> + As of version 0.9, there is no function for saving XML document to wide + character paths. Unfortunately, there is no portable way to do this; the + version 1.0 will provide such function only for platforms with the corresponding + functionality. You can use stream-saving functions as a workaround if your + STL implementation can open file streams via wchar_t paths. + </p></td></tr> +</table></div> +<p> + This is a simple example of saving XML document to file (<a href="../samples/save_file.cpp" target="_top">samples/save_file.cpp</a>): + </p> +<p> + +</p> +<pre class="programlisting"><span class="comment">// save document to file +</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Saving result: "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">save_file</span><span class="special">(</span><span class="string">"save_file_output.xml"</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> +</pre> +<p> + </p> +</div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="manual.saving.stream"></a><a class="link" href="saving.html#manual.saving.stream" title="Saving document to C++ IOstreams"> Saving document to C++ IOstreams</a> +</h3></div></div></div> +<a name="xml_document::save_stream"></a><p> + For additional interoperability pugixml provides functions for saving document + to any object which implements C++ std::ostream interface. This allows you + to save documents to any standard C++ stream (i.e. file stream) or any third-party + compliant implementation (i.e. Boost Iostreams). Most notably, this allows + for easy debug output, since you can use <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span></code> + stream as saving target. There are two functions, one works with narrow character + streams, another handles wide character ones: + </p> +<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&</span> <span class="identifier">stream</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +<span class="keyword">void</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">wostream</span><span class="special">&</span> <span class="identifier">stream</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +</pre> +<p> + <code class="computeroutput"><span class="identifier">save</span></code> with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span></code> + argument saves the document to the stream in the same way as <code class="computeroutput"><span class="identifier">save_file</span></code> (i.e. with requested header and + with encoding conversions). On the other hand, <code class="computeroutput"><span class="identifier">save</span></code> + with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstream</span></code> argument saves the document to + the wide stream with <code class="computeroutput"><span class="identifier">encoding_wchar</span></code> + encoding. Because of this, using <code class="computeroutput"><span class="identifier">save</span></code> + with wide character streams requires careful (usually platform-specific) + stream setup (i.e. using the <code class="computeroutput"><span class="identifier">imbue</span></code> + function). Generally use of wide streams is discouraged, however it provides + you with the ability to save documents to non-Unicode encodings, i.e. you + can save Shift-JIS encoded data if you set the correct locale. + </p> +<a name="xml_writer_stream"></a><p> + Calling <code class="computeroutput"><span class="identifier">save</span></code> with stream + target is equivalent to creating an <code class="computeroutput"><span class="identifier">xml_writer_stream</span></code> + object with stream as the only constructor argument and then calling <code class="computeroutput"><span class="identifier">save</span></code>; see <a class="xref" href="saving.html#manual.saving.writer" title="Saving document via writer interface"> Saving document via writer interface</a> for writer + interface details. + </p> +<p> + This is a simple example of saving XML document to standard output (<a href="../samples/save_stream.cpp" target="_top">samples/save_stream.cpp</a>): + </p> +<p> + +</p> +<pre class="programlisting"><span class="comment">// save document to standard output +</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Document:\n"</span><span class="special">;</span> +<span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">);</span> +</pre> +<p> + </p> +</div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="manual.saving.writer"></a><a class="link" href="saving.html#manual.saving.writer" title="Saving document via writer interface"> Saving document via writer interface</a> +</h3></div></div></div> +<a name="xml_document::save"></a><a name="xml_writer"></a><a name="xml_writer::write"></a><p> + All of the above saving functions are implemented in terms of writer interface. + This is a simple interface with a single function, which is called several + times during output process with chunks of document data as input: + </p> +<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">xml_writer</span> +<span class="special">{</span> +<span class="keyword">public</span><span class="special">:</span> + <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">write</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*</span> <span class="identifier">data</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> +<span class="special">};</span> + +<span class="keyword">void</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">xml_writer</span><span class="special">&</span> <span class="identifier">writer</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +</pre> +<p> + In order to output the document via some custom transport, for example sockets, + you should create an object which implements <code class="computeroutput"><span class="identifier">xml_writer_file</span></code> + interface and pass it to <code class="computeroutput"><span class="identifier">save</span></code> + function. <code class="computeroutput"><span class="identifier">xml_writer_file</span><span class="special">::</span><span class="identifier">write</span></code> + function is called with a buffer as an input, where <code class="computeroutput"><span class="identifier">data</span></code> + points to buffer start, and <code class="computeroutput"><span class="identifier">size</span></code> + is equal to the buffer size in bytes. <code class="computeroutput"><span class="identifier">write</span></code> + implementation must write the buffer to the transport; it can not save the + passed buffer pointer, as the buffer contents will change after <code class="computeroutput"><span class="identifier">write</span></code> returns. The buffer contains the + chunk of document data in the desired encoding. + </p> +<p> + <code class="computeroutput"><span class="identifier">write</span></code> function is called + with relatively large blocks (size is usually several kilobytes, except for + the first block with BOM, which is output only if <code class="computeroutput"><span class="identifier">format_write_bom</span></code> + is set, and last block, which may be small), so there is often no need for + additional buffering in the implementation. + </p> +<p> + This is a simple example of custom writer for saving document data to STL + string (<a href="../samples/save_custom_writer.cpp" target="_top">samples/save_custom_writer.cpp</a>); + read the sample code for more complex examples: + </p> +<p> + +</p> +<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xml_string_writer</span><span class="special">:</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_writer</span> +<span class="special">{</span> + <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">result</span><span class="special">;</span> + + <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">write</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*</span> <span class="identifier">data</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">)</span> + <span class="special">{</span> + <span class="identifier">result</span> <span class="special">+=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">size</span><span class="special">);</span> + <span class="special">}</span> +<span class="special">};</span> +</pre> +<p> + </p> +</div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="manual.saving.subtree"></a><a class="link" href="saving.html#manual.saving.subtree" title="Saving a single subtree"> Saving a single subtree</a> +</h3></div></div></div> +<a name="xml_node::print"></a><a name="xml_node::print_stream"></a><p> + While the previously described functions saved the whole document to the + destination, it is easy to save a single subtree. The following functions + are provided: + </p> +<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">print</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">&</span> <span class="identifier">os</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">depth</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +<span class="keyword">void</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">print</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">wostream</span><span class="special">&</span> <span class="identifier">os</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">depth</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +<span class="keyword">void</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">print</span><span class="special">(</span><span class="identifier">xml_writer</span><span class="special">&</span> <span class="identifier">writer</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">indent</span> <span class="special">=</span> <span class="string">"\t"</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">depth</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> +</pre> +<p> + These functions have the same arguments with the same meaning as the corresponding + <code class="computeroutput"><span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save</span></code> functions, and allow you to save the + subtree to either a C++ IOstream or to any object that implements <code class="computeroutput"><span class="identifier">xml_writer</span></code> interface. + </p> +<p> + Saving a subtree differs from saving the whole document: the process behaves + as if <code class="computeroutput"><span class="identifier">format_write_bom</span></code> is + off, and <code class="computeroutput"><span class="identifier">format_no_declaration</span></code> + is on, even if actual values of the flags are different. This means that + BOM is not written to the destination, and document declaration is only written + if it is the node itself or is one of node's children. Note that this also + holds if you're saving a document; this example (<a href="../samples/save_subtree.cpp" target="_top">samples/save_subtree.cpp</a>) + illustrates the difference: + </p> +<p> + +</p> +<pre class="programlisting"><span class="comment">// get a test document +</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span> +<span class="identifier">doc</span><span class="special">.</span><span class="identifier">load</span><span class="special">(</span><span class="string">"<foo bar='baz'><call>hey</call></foo>"</span><span class="special">);</span> + +<span class="comment">// print document to standard output (prints <?xml version="1.0"?><foo bar="baz"><call>hey</call></foo>) +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">""</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_raw</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> + +<span class="comment">// print document to standard output as a regular node (prints <foo bar="baz"><call>hey</call></foo>) +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">print</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">""</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_raw</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> + +<span class="comment">// print a subtree to standard output (prints <call>hey</call>) +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"foo"</span><span class="special">).</span><span class="identifier">child</span><span class="special">(</span><span class="string">"call"</span><span class="special">).</span><span class="identifier">print</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">""</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_raw</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> +</pre> +<p> + </p> +</div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="manual.saving.options"></a><a class="link" href="saving.html#manual.saving.options" title="Output options"> Output options</a> +</h3></div></div></div> +<p> + All saving functions accept the optional parameter <code class="computeroutput"><span class="identifier">flags</span></code>. + This is a bitmask that customizes the output format; you can select the way + the document nodes are printed and select the needed additional information + that is output before the document contents. + </p> +<div class="note"><table border="0" summary="Note"> +<tr> +<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td> +<th align="left">Note</th> +</tr> +<tr><td align="left" valign="top"><p> + You should use the usual bitwise arithmetics to manipulate the bitmask: + to enable a flag, use <code class="computeroutput"><span class="identifier">mask</span> <span class="special">|</span> <span class="identifier">flag</span></code>; + to disable a flag, use <code class="computeroutput"><span class="identifier">mask</span> <span class="special">&</span> <span class="special">~</span><span class="identifier">flag</span></code>. + </p></td></tr> +</table></div> +<p> + These flags control the resulting tree contents: + </p> +<div class="itemizedlist"><ul class="itemizedlist" type="disc"> +<li class="listitem"> + <a name="format_indent"></a><code class="literal">format_indent</code> determines if all nodes + should be indented with the indentation string (this is an additional + parameter for all saving functions, and is <code class="computeroutput"><span class="string">"\t"</span></code> + by default). If this flag is on, before every node the indentation string + is output several times, where the amount of indentation depends on the + node's depth relative to the output subtree. This flag has no effect + if <code class="computeroutput"><span class="identifier">format_raw</span></code> is enabled. + This flag is <span class="bold"><strong>on</strong></span> by default. <br><br> + + </li> +<li class="listitem"> + <a name="format_raw"></a><code class="literal">format_raw</code> switches between formatted and + raw output. If this flag is on, the nodes are not indented in any way, + and also no newlines that are not part of document text are printed. + Raw mode can be used for serialization where the result is not intended + to be read by humans; also it can be useful if the document was parsed + with <code class="computeroutput"><span class="identifier">parse_ws_pcdata</span></code> + flag, to preserve the original document formatting as much as possible. + This flag is <span class="bold"><strong>off</strong></span> by default. + </li> +</ul></div> +<p> + These flags control the additional output information: + </p> +<div class="itemizedlist"><ul class="itemizedlist" type="disc"> +<li class="listitem"> + <a name="format_no_declaration"></a><code class="literal">format_no_declaration</code> allows + to disable default node declaration output. By default, if the document + is saved via <code class="computeroutput"><span class="identifier">save</span></code> or + <code class="computeroutput"><span class="identifier">save_file</span></code> function, and + it does not have any document declaration, a default declaration is output + before the document contents. Enabling this flag disables this declaration. + This flag has no effect in <code class="computeroutput"><span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">print</span></code> + functions: they never output the default declaration. This flag is <span class="bold"><strong>off</strong></span> by default. <br><br> + + </li> +<li class="listitem"> + <a name="format_write_bom"></a><code class="literal">format_write_bom</code> allows to enable + Byte Order Mark (BOM) output. By default, no BOM is output, so in case + of non UTF-8 encodings the resulting document's encoding may not be recognized + by some parsers and text editors, if they do not implement sophisticated + encoding detection. Enabling this flag adds an encoding-specific BOM + to the output. This flag has no effect in <code class="computeroutput"><span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">print</span></code> + functions: they never output the BOM. This flag is <span class="bold"><strong>off</strong></span> + by default. + </li> +</ul></div> +<p> + Additionally, there is one predefined option mask: + </p> +<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> + <a name="format_default"></a><code class="literal">format_default</code> is the default set of + flags, i.e. it has all options set to their default values. It sets formatted + output with indentation, without BOM and with default node declaration, + if necessary. + </li></ul></div> +<p> + This is an example that shows the outputs of different output options (<a href="../samples/save_options.cpp" target="_top">samples/save_options.cpp</a>): + </p> +<p> + +</p> +<pre class="programlisting"><span class="comment">// get a test document +</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span> +<span class="identifier">doc</span><span class="special">.</span><span class="identifier">load</span><span class="special">(</span><span class="string">"<foo bar='baz'><call>hey</call></foo>"</span><span class="special">);</span> + +<span class="comment">// default options; prints +</span><span class="comment">// <?xml version="1.0"?> +</span><span class="comment">// <foo bar="baz"> +</span><span class="comment">// <call>hey</call> +</span><span class="comment">// </foo> +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> + +<span class="comment">// default options with custom indentation string; prints +</span><span class="comment">// <?xml version="1.0"?> +</span><span class="comment">// <foo bar="baz"> +</span><span class="comment">// --<call>hey</call> +</span><span class="comment">// </foo> +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">"--"</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> + +<span class="comment">// default options without indentation; prints +</span><span class="comment">// <?xml version="1.0"?> +</span><span class="comment">// <foo bar="baz"> +</span><span class="comment">// <call>hey</call> +</span><span class="comment">// </foo> +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">"\t"</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_default</span> <span class="special">&</span> <span class="special">~</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_indent</span><span class="special">);</span> <span class="comment">// can also pass "" instead of indentation string for the same effect +</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> + +<span class="comment">// raw output; prints +</span><span class="comment">// <?xml version="1.0"?><foo bar="baz"><call>hey</call></foo> +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">"\t"</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_raw</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> + +<span class="comment">// raw output without declaration; prints +</span><span class="comment">// <foo bar="baz"><call>hey</call></foo> +</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="string">"\t"</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_raw</span> <span class="special">|</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">format_no_declaration</span><span class="special">);</span> +<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> +</pre> +<p> + </p> +</div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="manual.saving.encoding"></a><a class="link" href="saving.html#manual.saving.encoding" title="Encodings"> Encodings</a> +</h3></div></div></div> +<p> + pugixml supports all popular Unicode encodings (UTF-8, UTF-16 (big and little + endian), UTF-32 (big and little endian); UCS-2 is naturally supported since + it's a strict subset of UTF-16) and handles all encoding conversions during + output. The output encoding is set via the <code class="computeroutput"><span class="identifier">encoding</span></code> + parameter of saving functions, which is of type <code class="computeroutput"><span class="identifier">xml_encoding</span></code>. + The possible values for the encoding are documented in <a class="xref" href="loading.html#manual.loading.encoding" title="Encodings"> Encodings</a>; + the only flag that has a different meaning is <code class="computeroutput"><span class="identifier">encoding_auto</span></code>. + </p> +<p> + While all other flags set the exact encoding, <code class="computeroutput"><span class="identifier">encoding_auto</span></code> + is meant for automatic encoding detection. The automatic detection does not + make sense for output encoding, since there is usually nothing to infer the + actual encoding from, so here <code class="computeroutput"><span class="identifier">encoding_auto</span></code> + means UTF-8 encoding, which is the most popular encoding for XML data storage. + This is also the default value of output encoding; specify another value + if you do not want UTF-8 encoded output. + </p> +<p> + Also note that wide stream saving functions do not have <code class="computeroutput"><span class="identifier">encoding</span></code> + argument and always assume <code class="computeroutput"><span class="identifier">encoding_wchar</span></code> + encoding. + </p> +<div class="note"><table border="0" summary="Note"> +<tr> +<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td> +<th align="left">Note</th> +</tr> +<tr><td align="left" valign="top"><p> + The current behavior for Unicode conversion is to skip all invalid UTF + sequences during conversion. This behavior should not be relied upon; if + your node/attribute names do not contain any valid UTF sequences, they + may be output as if they are empty, which will result in malformed XML + document. + </p></td></tr> +</table></div> +</div> +</div> +<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> +<td align="left"></td> +<td align="right"><div class="copyright-footer">Copyright © 2010 Arseny Kapoulkine<p> + Distributed under the MIT License + </p> +</div></td> +</tr></table> +<hr> +<table width="100%"><tr> +<td>pugixml 0.9 manual | + <a href="../manual.html">Overview</a> | + <a href="install.html">Installation</a> | + Document: + <a href="dom.html">Object model</a> · <a href="loading.html">Loading</a> · <a href="access.html">Accessing</a> · <a href="modify.html">Modifying</a> · <b>Saving</b> | + <a href="xpath.html">XPath</a> | + <a href="apiref.html">API Reference</a> | + <a href="toc.html">Table of Contents</a> +</td> +<td width="*" align="right"><div class="spirit-nav"> +<a accesskey="p" href="modify.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../manual.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../manual.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="xpath.html"><img src="../images/next.png" alt="Next"></a> +</div></td> +</tr></table> +</body> +</html> |