pascalabcnet/PABCNetHelp/LangGuide/ExceptionHandling/userExceptions.html

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<H1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></H1>
<p><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> - <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <code>Exception</code>:</p>
<blockquote>
<p><code><b>type</b> MyException =<b> class</b>(Exception) <b>end</b>;</code></p>
</blockquote>
<p><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><>, <20><><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD>, <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:</p>
<blockquote>
<p><code><b>try</b><br>
&nbsp; ...<br>
<b>except</b><br>
&nbsp; <b>on</b> MyException <b>do</b><br>&nbsp;&nbsp;&nbsp; writeln('<27><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
<09><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> 0');&nbsp; <br>&nbsp; <b>on</b> Exception <b>do</b><br><b>&nbsp;&nbsp;&nbsp;
</b>writeln('<27><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>');&nbsp;<br>
<b>end</b>;</code></p>
</blockquote>
<p><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:</p>
<blockquote>
<p><code><b>type</b> <br>
&nbsp; FileNotFoundException = <b>class</b>(Exception)<b><br>
</b>&nbsp;&nbsp;&nbsp; fname: <b>string</b>;<br>
<b>&nbsp; &nbsp; constructor</b> Create(msg,fn: <b>string</b>);<br>
<b>&nbsp;&nbsp;&nbsp; begin</b><br>
&nbsp; <b>&nbsp;&nbsp;&nbsp; inherited</b> Create(msg);<br>
&nbsp;&nbsp;&nbsp; &nbsp; fname := fn;<br>
<b>&nbsp;&nbsp;&nbsp; end</b>;<b><br>
&nbsp; end</b>;</code></p>
<p><code>...</code></p>
<p><code><b>procedure </b>ReadFile(fname: <b>string</b>);<br>
<b>begin</b><br>
&nbsp; <b>if</b> <b>not</b>
FileExists(fname) <b>then</b><br>
&nbsp;&nbsp;&nbsp; <b>raise</b> <b>new</b> FileNotFoundException('<27><><EFBFBD><EFBFBD>
<09><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>',fname);<br>
<b>end</b>;</code></p>
<p><code>...</code></p>
<p><code><b>try</b><br>
&nbsp; ...<br>
<b>except</b><br>
&nbsp; <b>on</b> e: FileNotFoundException <b>do</b><br><b>&nbsp;&nbsp;&nbsp;
</b>writeln('<27><><EFBFBD><EFBFBD> '+e.fname+'
<09><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>');&nbsp;<br>
<b>end</b>;</code></p>
</blockquote>
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