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| <table class="index-toc-link"><tr><td class="left">[<a href="ft2-index.html">Index</a>]</td><td class="right">[<a href="ft2-toc.html">TOC</a>]</td></tr></table> | |
| <h1>FreeType-2.6.2 API Reference</h1> | |
| <h1 id="error_enumerations">Error Enumerations</h1> | |
| <p>The header file ‘fterrors.h’ (which is automatically included by ‘freetype.h’ 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><b>Error</b> <b>Formats</b></p> | |
| <p>The configuration macro FT_CONFIG_OPTION_USE_MODULE_ERRORS can be defined in ‘ftoption.h’ in order to make the higher byte indicate the module where the error has happened (this is not compatible with standard builds of FreeType&nbsp;2, however). See the file ‘ftmoderr.h’ for more details.</p> | |
| <p><b>Error</b> <b>Message</b> <b>Strings</b></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&nbsp;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.</p> | |
| <pre class="colored"> | |
| FT_ERROR_START_LIST | |
| </pre> | |
| <p>This macro is called before anything else to define the start of the error list. It is followed by several FT_ERROR_DEF calls.</p> | |
| <pre class="colored"> | |
| FT_ERROR_DEF( e, v, s ) | |
| </pre> | |
| <p>This macro is called to define one single error. ‘e’ is the error code identifier (e.g., ‘Invalid_Argument’), ‘v’ is the error's numerical value, and ‘s’ is the corresponding error string.</p> | |
| <pre class="colored"> | |
| FT_ERROR_END_LIST | |
| </pre> | |
| <p>This macro ends the list.</p> | |
| <p>Additionally, you have to undefine ‘__FTERRORS_H__’ before #including this file.</p> | |
| <p>Here is a simple example.</p> | |
| <pre class="colored"> | |
| #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 | |
| </pre> | |
| <p>Note that ‘FT_Err_Ok’ is <i>not</i> defined with ‘FT_ERRORDEF’ but with ‘FT_NOERRORDEF’; it is always zero.</p> | |
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