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1283 <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>
1285 <h1 id="error-enumerations">Error Enumerations<a class="headerlink" href="#error-enumerations" title="Permanent link">¶</a></h1>
1286 <h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2>
1287 <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>
1288 <p><strong>Error Formats</strong></p>
1289 <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>
1290 <p><strong>Error Message Strings</strong></p>
1291 <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>
1292 <p>To do so, you have to define the following macros before including this file.
1293 <div class="highlight"><pre><span></span><code> FT_ERROR_START_LIST
1294 </code></pre></div></p>
1295 <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.
1296 <div class="highlight"><pre><span></span><code> FT_ERROR_DEF( e, v, s )
1297 </code></pre></div></p>
1298 <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.
1299 <div class="highlight"><pre><span></span><code> FT_ERROR_END_LIST
1300 </code></pre></div></p>
1301 <p>This macro ends the list.</p>
1302 <p>Additionally, you have to undefine <code>FTERRORS_H_</code> before #including this file.</p>
1303 <p>Here is a simple example.
1304 <div class="highlight"><pre><span></span><code> #undef FTERRORS_H_
1305 #define FT_ERRORDEF( e, v, s ) { e, s },
1306 #define FT_ERROR_START_LIST {
1307 #define FT_ERROR_END_LIST { 0, NULL } };
1312 const char* err_msg;
1315 #include <freetype/fterrors.h>
1316 </code></pre></div></p>
1317 <p>An alternative to using an array is a switch statement.
1318 <div class="highlight"><pre><span></span><code> #undef FTERRORS_H_
1319 #define FT_ERROR_START_LIST switch ( error_code ) {
1320 #define FT_ERRORDEF( e, v, s ) case v: return s;
1321 #define FT_ERROR_END_LIST }
1322 </code></pre></div></p>
1323 <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>
1324 <h2 id="ft_error_string">FT_Error_String<a class="headerlink" href="#ft_error_string" title="Permanent link">¶</a></h2>
1325 <p>Defined in FT_ERRORS_H (freetype/fterrors.h).</p>
1326 <div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">const</span> <span class="keyword">char</span>* )
1327 <b>FT_Error_String</b>( <a href="ft2-basic_types.html#ft_error">FT_Error</a> error_code );
1330 <p>Retrieve the description of a valid FreeType error code.</p>
1332 <table class="fields">
1333 <tr><td class="val" id="error_code">error_code</td><td class="desc">
1334 <p>A valid FreeType error code.</p>
1340 <p>A C string or <code>NULL</code>, if any error occurred.</p>
1343 <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>
1344 <p>Module identification will be ignored:
1345 <div class="highlight"><pre><span></span><code><span class="w"> </span><span class="n">strcmp</span><span class="p">(</span><span class="w"> </span><span class="n">FT_Error_String</span><span class="p">(</span><span class="w"> </span><span class="n">FT_Err_Unknown_File_Format</span><span class="w"> </span><span class="p">),</span>
1346 <span class="w"> </span><span class="n">FT_Error_String</span><span class="p">(</span><span class="w"> </span><span class="n">BDF_Err_Unknown_File_Format</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
1347 </code></pre></div></p>
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