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+ + + </ul> + </nav> + </li> + + + </ul> +</nav> + </div> + </div> + </div> + + + <div class="md-sidebar md-sidebar--secondary" data-md-component="toc"> + <div class="md-sidebar__scrollwrap"> + <div class="md-sidebar__inner"> + +<nav class="md-nav md-nav--secondary"> + + + + + + <label class="md-nav__title" for="__toc">Table of contents</label> + <ul class="md-nav__list" data-md-scrollfix> + + <li class="md-nav__item"> + <a href="#synopsis" class="md-nav__link"> + Synopsis + </a> + +</li> + + <li class="md-nav__item"> + <a href="#ft_error_string" class="md-nav__link"> + FT_Error_String + </a> + +</li> + + + + + + </ul> + +</nav> + </div> + </div> + </div> + + + <div class="md-content"> + <article class="md-content__inner md-typeset"> + + + + <p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#error-codes">Error Codes</a> » Error Enumerations</p> +<hr /> +<h1 id="error-enumerations">Error Enumerations<a class="headerlink" href="#error-enumerations" title="Permanent link">¶</a></h1> +<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> +<p>The header file <code>fterrors.h</code> (which is automatically included by <code>freetype.h</code> defines the handling of FreeType's enumeration constants. It can also be used to generate error message strings with a small macro trick explained below.</p> +<p><strong>Error Formats</strong></p> +<p>The configuration macro <code>FT_CONFIG_OPTION_USE_MODULE_ERRORS</code> can be defined in <code>ftoption.h</code> in order to make the higher byte indicate the module where the error has happened (this is not compatible with standard builds of FreeType 2, however). See the file <code>ftmoderr.h</code> for more details.</p> +<p><strong>Error Message Strings</strong></p> +<p>Error definitions are set up with special macros that allow client applications to build a table of error message strings. The strings are not included in a normal build of FreeType 2 to save space (most client applications do not use them).</p> +<p>To do so, you have to define the following macros before including this file. +<div class="highlight"><pre><span></span><code> FT_ERROR_START_LIST +</code></pre></div></p> +<p>This macro is called before anything else to define the start of the error list. It is followed by several <code>FT_ERROR_DEF</code> calls. +<div class="highlight"><pre><span></span><code> FT_ERROR_DEF( e, v, s ) +</code></pre></div></p> +<p>This macro is called to define one single error. ‘e’ is the error code identifier (e.g., <code>Invalid_Argument</code>), ‘v’ is the error's numerical value, and ‘s’ is the corresponding error string. +<div class="highlight"><pre><span></span><code> FT_ERROR_END_LIST +</code></pre></div></p> +<p>This macro ends the list.</p> +<p>Additionally, you have to undefine <code>FTERRORS_H_</code> before #including this file.</p> +<p>Here is a simple example. +<div class="highlight"><pre><span></span><code> #undef FTERRORS_H_ + #define FT_ERRORDEF( e, v, s ) { e, s }, + #define FT_ERROR_START_LIST { + #define FT_ERROR_END_LIST { 0, NULL } }; + + const struct + { + int err_code; + const char* err_msg; + } ft_errors[] = + + #include FT_ERRORS_H +</code></pre></div></p> +<p>An alternative to using an array is a switch statement. +<div class="highlight"><pre><span></span><code> #undef FTERRORS_H_ + #define FT_ERROR_START_LIST switch ( error_code ) { + #define FT_ERRORDEF( e, v, s ) case v: return s; + #define FT_ERROR_END_LIST } +</code></pre></div></p> +<p>If you use <code>FT_CONFIG_OPTION_USE_MODULE_ERRORS</code>, <code>error_code</code> should be replaced with <code>FT_ERROR_BASE(error_code)</code> in the last example.</p> +<h2 id="ft_error_string">FT_Error_String<a class="headerlink" href="#ft_error_string" title="Permanent link">¶</a></h2> +<p>Defined in FT_ERRORS_H (freetype/fterrors.h).</p> +<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">const</span> <span class="keyword">char</span>* ) + <b>FT_Error_String</b>( <a href="ft2-basic_types.html#ft_error">FT_Error</a> error_code ); + +FT_END_HEADER + + +#<span class="keyword">endif</span> /* FT_ERR_PROTOS_DEFINED */ + +#<span class="keyword">endif</span> /* FT_INCLUDE_ERR_PROTOS */ + +#<span class="keyword">endif</span> /* !(FTERRORS_H_ && __FTERRORS_H__) */ + + +/* END */ +</code></pre></div> + +<p>Retrieve the description of a valid FreeType error code.</p> +<h4>input</h4> + +<table class="fields"> +<tr><td class="val" id="error_code">error_code</td><td class="desc"> +<p>A valid FreeType error code.</p> +</td></tr> +</table> + +<h4>return</h4> + +<p>A C string or <code>NULL</code>, if any error occurred.</p> +<h4>note</h4> + +<p>FreeType has to be compiled with <code>FT_CONFIG_OPTION_ERROR_STRINGS</code> or <code>FT_DEBUG_LEVEL_ERROR</code> to get meaningful descriptions. ‘error_string’ will be <code>NULL</code> otherwise.</p> +<p>Module identification will be ignored: +<div class="highlight"><pre><span></span><code> <span class="n">strcmp</span><span class="p">(</span> <span class="n">FT_Error_String</span><span class="p">(</span> <span class="n">FT_Err_Unknown_File_Format</span> <span class="p">),</span> + <span class="n">FT_Error_String</span><span class="p">(</span> <span class="n">BDF_Err_Unknown_File_Format</span> <span class="p">)</span> <span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">;</span> +</code></pre></div></p> +<hr> + + + + + + + + + + + </article> + </div> + </div> + </main> + + +<footer class="md-footer"> + + <div class="md-footer-nav"> + <nav class="md-footer-nav__inner md-grid"> + + <a href="ft2-bzip2.html" title="BZIP2 Streams" class="md-flex md-footer-nav__link md-footer-nav__link--prev" rel="prev"> + <div class="md-flex__cell md-flex__cell--shrink"> + <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i> + </div> + <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> + <span class="md-flex__ellipsis"> + <span class="md-footer-nav__direction"> + Previous + </span> + BZIP2 Streams + </span> + </div> + </a> + + + <a href="ft2-error_code_values.html" title="Error Code Values" class="md-flex md-footer-nav__link md-footer-nav__link--next" rel="next"> + <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"> + <span class="md-flex__ellipsis"> + <span class="md-footer-nav__direction"> + Next + </span> + Error Code Values + </span> + </div> + <div class="md-flex__cell md-flex__cell--shrink"> + <i class="md-icon md-icon--arrow-forward md-footer-nav__button"></i> + </div> + </a> + + </nav> + </div> + + <div class="md-footer-meta md-typeset"> + <div class="md-footer-meta__inner md-grid"> + <div class="md-footer-copyright"> + + <div class="md-footer-copyright__highlight"> + Copyright 2020 <a href = "https://www.freetype.org/license.html">The FreeType Project</a>. + </div> + + powered by + <a href="https://www.mkdocs.org" target="_blank" rel="noopener">MkDocs</a> + and + <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener"> + Material for MkDocs</a> + </div> + + </div> + </div> +</footer> + + </div> + + <script src="assets/javascripts/application.c33a9706.js"></script> + + <script>app.initialize({version:"1.1",url:{base:"."}})</script> + + <script src="javascripts/extra.js"></script> + + + </body> +</html>
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