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<a href="ft2-error_enumerations.html" title="Error Enumerations" class="md-nav__link md-nav__link--active"> Error Enumerations </a> <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> </li> <li class="md-nav__item"> <a href="ft2-error_code_values.html" title="Error Code Values" class="md-nav__link"> Error Code Values </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-toggle md-nav__toggle" data-md-toggle="nav-10" type="checkbox" id="nav-10"> <label class="md-nav__link" for="nav-10"> Miscellaneous </label> <nav class="md-nav" data-md-component="collapsible" data-md-level="1"> <label class="md-nav__title" for="nav-10"> Miscellaneous </label> <ul 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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 <freetype/fterrors.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>