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<html><!-- #BeginTemplate "/Templates/tmpl.dwt" --><!-- DW6 --><head><!-- #BeginEditable "doctitle" --> <title>PTypes: streams: logfile</title><!-- #EndEditable --> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link rel="stylesheet" href="styles.css"></head><body bgcolor="#FFFFFF" leftmargin="40" marginwidth="40"><p><a href="../index.html"><img src="title-20.png" width="253" height="39" alt="C++ Portable Types Library (PTypes) Version 2.0" border="0"></a> <hr size="1" noshade><!-- #BeginEditable "body" --> <p class="hpath"><a href="index.html">Top</a>: <a href="streams.html">Streams</a>: logfile </p><blockquote> <pre class="lang">#include <pstreams.h>class logfile: outfile { logfile( [ const string& filename, bool append = true ] ); void putf(const char* fmt, ...);}</pre></blockquote><p> The <span class="lang">lofgile</span> class inherits all public methods and properties from <a href="streams.outfile.html">outfile</a>, but differs in the following:</p><ul><li>The <span class="lang">append</span> property is set to <span class="lang">true</span> by default.</li><li>The buffer size is set to 0 by default.</li><li>The <span class="lang">logfile::putf()</span> function is thread-safe: you can call this function for the same logfile object from concurrent threads.</li></ul><p><span class="def">logfile::logfile( [ const string& filename, bool append = true ] )</span> creates an output file stream, but does not open the file. When opening a file with <span class="lang">open()</span>, the file pointer is positioned at the end of the file, unless <span class="lang">append</span> is set to <span class="lang">false</span>. <span class="lang">Filename</span> and <span class="lang">append</span> parameters are optional.</p><p><span class="def">void logfile::putf(const char* fmt, ...)</span> is a thread-safe version of <span class="lang">outstm::putf()</span>.</p><p class="seealso">See also: <a href="streams.iobase.html">iobase</a>, <a href="streams.outstm.html">outstm</a>, <a href="streams.outfile.html">outfile</a>, <a href="streams.examples.html">Examples</a></p><!-- #EndEditable --><hr size="1"><a href="../index.html" class="ns">PTypes home</a></body><!-- #EndTemplate --></html>⌨️ 快捷键说明
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