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| author | neodarz <neodarz@neodarz.net> | 2018-08-11 20:21:34 +0200 |
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| committer | neodarz <neodarz@neodarz.net> | 2018-08-11 20:21:34 +0200 |
| commit | 0ea5fc66924303d1bf73ba283a383e2aadee02f2 (patch) | |
| tree | 2568e71a7ccc44ec23b8bb3f0ff97fb6bf2ed709 /docs/doxygen/nel/log_howto.html | |
| download | nevrax-website-self-hostable-0ea5fc66924303d1bf73ba283a383e2aadee02f2.tar.xz nevrax-website-self-hostable-0ea5fc66924303d1bf73ba283a383e2aadee02f2.zip | |
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+</td></tr></table> + + +<!-- block --> +<TABLE bgcolor="#dddddd" CELLSPACING=0 CELLPADDING=0 BORDER=0 width=100%><tr><td width=1% valign=middle><img width=6 height=14 hspace=2 vspace=2 src="http://www.nevrax.org/inc/img/reddots.gif"></TD> + <TD><B>Documentation</B></TD> + <TD ALIGN=RIGHT> </td> +</tr></table> +<!-- Generated by Doxygen 1.2.14 --> +<center> +<a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="namespaces.html">Namespace List</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="classes.html">Alphabetical List</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="namespacemembers.html">Namespace Members</a> <a class="qindex" href="functions.html">Compound Members</a> <a class="qindex" href="globals.html">File Members</a> <a class="qindex" href="pages.html">Related Pages</a> <a class="qindexRef" doxygen="_cgi:http://www.nevrax.org/cgi-bin/nel-search.cgi" href="http://www.nevrax.org/cgi-bin/nel-search.cgi">Search</a> </center> +<hr><a name="log_howto"><h2>How to log information (for debugging purpose) ?</h2></a> + <dl compact><dt><b> +Author: </b><dd> +Olivier Cado </dl><dl compact><dt><b> +Date: </b><dd> +Updated May 4 2001</dl>This document explains how to log some information (into the screen, into a file or to a logging server), e.g. in order to debug your code. +<p> +<a name="basic_debug"><h2>Basic usage of the debugging system</h2></a> + The debugging sytem allows to log information at various levels. Include the header file "<a class="el" href="debug_8h.html">nel/misc/debug.h</a>". +<p> +The main functionalities are offered by the macros nldebug, nlinfo, nlwarning and also nlerror and nlassert, and by their variant forms (see <a class="el" href="debug_8h.html">debug.h</a>). They allow to display strings, with open arguments, using the "printf" syntax. In the default behaviour, the text passed to nldebug is displayed into stdout in NL_DEBUG mode, but not in NL_RELEASE. The logged texts are also written into a file called "log.log" in the working directory. These macros print the strings with an information header. +<p> +Example : <div class="fragment"><pre> sint32 age = -2; + <a class="code" href="debug_8h.html#a0">nldebug</a>( <font class="stringliteral">"Toto is %d years old"</font>, age ); + <font class="keywordflow">if</font> ( age < 0 ) + { + <a class="code" href="debug_8h.html#a3">nlerror</a>( <font class="stringliteral">"Invalid age for toto : %d"</font>, age ); + + <font class="comment">// the program will not come here because nlerror throws an exception to exit</font> + } + + STDOUT (logger thread_id <a class="code" href="cf__lexical_8cpp.html#a95">file</a> line: debug_string): + DBG 1234 myfile.cpp 10: Toto is -2 years old + ERR 1234 myfile.cpp 13: Invalid age for <a class="code" href="namespaceNLMISC.html#a294">toto</a> : -2 + Abort + + FILE OUTPUT (date time logger debug_string): + 01/04/11 18:24:50 DBG: Toto is -2 years old + 01/04/11 18:24:50 ERR: Invalid age for <a class="code" href="namespaceNLMISC.html#a294">toto</a> : -2 +</pre></div> +<p> +Because NeL allows to create multithreaded programs, these macros use mutual exclusions (mutex) to ensure no data is corrupted and the displayed text not interlaced. +<p> +<a name="adv_log"><h2>Advanced usage of the logging system</h2></a> + +<p> +You may want to customize the logging system directly, for your own needs. Include "<a class="el" href="log_8h.html">nel/misc/log.h</a>". +<p> +<a name="init_log"><h3>Initialization</h3></a> + If your program is not a "service" in the NeL terms (i.e. if it is not built on <a class="el" href="classNLNET_1_1IService.html">NLNET::IService</a>), first call createDebug() to create the basic global loggers <em>ErrorLog</em>, <em>WarningLog</em>, <em>InfoLog</em>, <em>DebugLog</em> and <em>AssertLog</em> (the ones that are used by the nlerror, nlwarning, nlinfo, nldebug and nlassert macros). +<p> +Then, you can attach some displayers to the global loggers (<a class="el" href="classNLMISC_1_1CLog.html">NLMISC::CLog</a> objects).<ul> +<li><a class="el" href="classNLMISC_1_1CStdDisplayer.html">NLMISC::CStdDisplayer</a> is for stdout (the console, the VC++ output window...). It is attached by default to all of the five logger objects mentionned above.<li><a class="el" href="classNLMISC_1_1CFileDisplayer.html">NLMISC::CFileDisplayer</a> is for a file.<li><a class="el" href="classNLMISC_1_1CMsgBoxDisplayer.html">NLMISC::CMsgBoxDisplayer</a> is for a message box.<li><a class="el" href="classNLNET_1_1CNetDisplayer.html">NLNET::CNetDisplayer</a> is for a logging server (see CLogService in the nelns documentation).<li>You can can create your own displayer, in order to print the logged text onto a new target (for example, see the class CChatDisplayer in Snowballs 0.2) or to customize the filter on the header.</ul> +Example (we assume CNetDisplayer allows to log via the network): <div class="fragment"><pre> <a class="code" href="namespaceNLMISC.html#a247">createDebug</a>(); <font class="comment">// automatically done in a "service"</font> + <a class="code" href="classNLNET_1_1CNetDisplayer.html">NLNET::CNetDisplayer</a> *nd = <font class="keyword">new</font> CNetDisplayer(); <font class="comment">// the address of the Logging Server is automatically retrieved using the Naming Service</font> + <font class="keywordflow">if</font> ( nd-><a class="code" href="classNLNET_1_1CNetDisplayer.html#a3">connected</a>() ) <font class="comment">// this line is optional: here we don't want the displayer to attempt other connections if the first one failed</font> + { + NLMISC::DebugLog.addDisplayer( nd ); + } +</pre></div> +<p> +<a name="use_log"><h3>Logging information</h3></a> + +<p> +How to log a string without repeating the header ? Use the methods of <a class="el" href="classNLMISC_1_1CLog.html">NLMISC::CLog</a>. +<p> +Example : <div class="fragment"><pre> NLMISC::DebugLog.displayNL ( <font class="stringliteral">"Dump of Values :"</font> ); + <font class="keywordflow">for</font> ( <font class="keywordtype">int</font> j=0; j!=<a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>; ++j ) + { + <font class="keywordflow">for</font> ( <font class="keywordtype">int</font> i=0; i!=<a class="code" href="driver__opengl__extension__def_8h.html#a389">width</a>; ++i ) + { + NLMISC::DebugLog.displayRaw( <font class="stringliteral">"%d "</font>, Values[j][i] ); + } + NLMISC::DebugLog.displayRawNL( <font class="stringliteral">": line %d"</font>, j ); + } +</pre></div> +<p> + + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=http://www.nevrax.org/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> +</BODY> +</HTML> |