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5 <TITLE>Magick::Exception</TITLE>
6 <META NAME="GENERATOR" CONTENT="StarOffice 7 (Solaris Sparc)">
7 <META NAME="AUTHOR" CONTENT="Bob Friesenhahn">
8 <META NAME="CREATED" CONTENT="20020805;15113101">
9 <META NAME="CHANGEDBY" CONTENT="Robert Friesenhahn">
10 <META NAME="CHANGED" CONTENT="20040819;11571100">
11 <META NAME="DESCRIPTION" CONTENT="Documentation for Magick::Exception class">
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25<H1 ALIGN=CENTER>Magick::Exception Classes</H1>
26<P><I>Exception</I> represents the base class of objects thrown when
27Magick++reports an error. Magick++ throws C++ exceptions synchronous
28with the operation where the error occurred. This allows errors to be
29trapped within the enclosing code (perhaps the code to process a
30single image) while allowing the code to be written with a simple
31coding style.</P>
32<P>A try/catch block should be placed around any sequence of
33operations which can be considered an important body of work. For
34example, if your program processes lists of images and some of these
35images may be defective, by placing the try/catch block around the
36entire sequence of code that processes one image (including
37instantiating the image object), you can minimize the overhead of
38error checking while ensuring that all objects created to deal with
39that object are safely destroyed (C++ exceptions unroll the stack
40until the enclosing try block, destroying any created objects).
41</P>
42<P>The pseudo code for the main loop of your program may look like:
43</P>
44<PRE><FONT COLOR="#000066"><FONT SIZE=2>for infile in list</FONT></FONT>
45<FONT COLOR="#000066"><FONT SIZE=2>{</FONT></FONT>
46<FONT COLOR="#000066"> <FONT SIZE=2>try {</FONT></FONT>
47<FONT COLOR="#000066"> <FONT SIZE=2>// Construct an image instance first so that we don't have to worry</FONT></FONT>
48<FONT COLOR="#000066"> <FONT SIZE=2>// about object construction failure due to a minor warning exception</FONT></FONT>
49<FONT COLOR="#000066"> <FONT SIZE=2>// being thrown.</FONT></FONT>
50<FONT COLOR="#000066"> <FONT SIZE=2>Magick::Image image; </FONT></FONT>
51<FONT COLOR="#000066"> <FONT SIZE=2>try {</FONT></FONT>
52<FONT COLOR="#000066"> <FONT SIZE=2>// Try reading image file</FONT></FONT>
53<FONT COLOR="#000066"> <FONT SIZE=2>image.read(infile);</FONT></FONT>
54<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
55<FONT COLOR="#000066"> <FONT SIZE=2>catch( Magick::WarningCoder &amp;warning )</FONT></FONT>
56<FONT COLOR="#000066"> <FONT SIZE=2>{</FONT></FONT>
57<FONT COLOR="#000066"> <FONT SIZE=2>// Process coder warning while loading file (e.g. TIFF warning)</FONT></FONT>
58<FONT COLOR="#000066"> <FONT SIZE=2>// Maybe the user will be interested in these warnings (or not).</FONT></FONT>
59<FONT COLOR="#000066"> <FONT SIZE=2>// If a warning is produced while loading an image, the image</FONT></FONT>
60<FONT COLOR="#000066"> <FONT SIZE=2>// can normally still be used (but not if the warning was about</FONT></FONT>
61<FONT COLOR="#000066"> <FONT SIZE=2>// something important!)</FONT></FONT>
62<FONT COLOR="#000066"> <FONT SIZE=2>cerr &lt;&lt; &ldquo;Coder Warning: &ldquo; &lt;&lt; warning.what() &lt;&lt; endl;</FONT></FONT>
63<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
64<FONT COLOR="#000066"> <FONT SIZE=2>catch( Magick::Warning &amp;warning )</FONT></FONT>
65<FONT COLOR="#000066"> <FONT SIZE=2>{</FONT></FONT>
66<FONT COLOR="#000066"> <FONT SIZE=2>// Handle any other Magick++ warning.</FONT></FONT>
67<FONT COLOR="#000066"> <FONT SIZE=2>cerr &lt;&lt; &ldquo;Warning: &ldquo; &lt;&lt; warning.what() &lt;&lt; endl;</FONT></FONT>
68<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
69<FONT COLOR="#000066"> <FONT SIZE=2>catch( Magick::BlobError &amp;error ) </FONT></FONT>
70<FONT COLOR="#000066"> <FONT SIZE=2>{ </FONT></FONT>
71<FONT COLOR="#000066"> <FONT SIZE=2>// Process Magick++ file open error</FONT></FONT>
72<FONT COLOR="#000066"> <FONT SIZE=2>cerr &lt;&lt; &ldquo;Error: &ldquo; &lt;&lt; error.what() &lt;&lt; endl;</FONT></FONT>
73<FONT COLOR="#000066"> <FONT SIZE=2>continue; // Try next image.</FONT></FONT>
74<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
75<FONT COLOR="#000066"> <FONT SIZE=2>try {</FONT></FONT>
76 <FONT SIZE=2><FONT COLOR="#000066">image.rotate(90);</FONT></FONT>
77 <FONT SIZE=2><FONT COLOR="#000066">image.write(&ldquo;outfile&rdquo;);</FONT></FONT>
78<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
79<FONT COLOR="#000066"> <FONT SIZE=2>catch ( Magick::Exception &amp; error)</FONT></FONT>
80<FONT COLOR="#000066"> <FONT SIZE=2>{</FONT></FONT>
81<FONT COLOR="#000066"> <FONT SIZE=2>// Handle problem while rotating or writing outfile.</FONT></FONT>
82<FONT COLOR="#000066"> <FONT SIZE=2>cerr &lt;&lt; &ldquo;Caught Magick++ exception: &ldquo; &lt;&lt; error.what() &lt;&lt; endl;</FONT></FONT>
83<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
84<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
85<FONT COLOR="#000066"> <FONT SIZE=2>catch( std::exception &amp;error )</FONT> </FONT>
86 <FONT SIZE=2><FONT COLOR="#000066">{</FONT> </FONT>
87 <FONT SIZE=2>// P<FONT COLOR="#000066">rocess any other exceptions derived from standard C++ exception</FONT></FONT>
88<FONT COLOR="#000066"> <FONT SIZE=2>err &lt;&lt; &ldquo;Caught C++ STD exception: &ldquo; &lt;&lt; error.what() &lt;&lt; endl;</FONT></FONT>
89<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT> </FONT>
90 <FONT SIZE=2><FONT COLOR="#000066">catch( ... )</FONT> </FONT>
91 <FONT SIZE=2><FONT COLOR="#000066">{</FONT> </FONT>
92 <FONT SIZE=2>// P<FONT COLOR="#000066">rocess *any* exception (last-ditch effort). There is not a lot</FONT></FONT>
93<FONT COLOR="#000066"> <FONT SIZE=2>// you can do here other to retry the operation that failed, or exit</FONT></FONT>
94<FONT COLOR="#000066"> <FONT SIZE=2>// the program. </FONT></FONT>
95 <FONT SIZE=2><FONT COLOR="#000066">}</FONT></FONT>
96<FONT COLOR="#000066"><FONT SIZE=2>}</FONT></FONT></PRE><P>
97The desired location and number of try/catch blocks in your program
98depends how sophisticated its error handling must be. Very simple
99programs may use just one try/catch block.</P>
100<P>The <I>Exception</I> class is derived from the C++ standard
101exception class. This means that it contains a C++ string containing
102additional information about the error (e.g to display to the user).
103Obtain access to this string via the what() method.&nbsp; For
104example:
105</P>
106<P><TT><FONT COLOR="#000066">&nbsp;catch( Exception &amp;error_ )</FONT></TT>
107<BR><TT><FONT COLOR="#000066">&nbsp;&nbsp;&nbsp; {</FONT></TT> <BR><TT><FONT COLOR="#000066">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
108cout &lt;&lt; &quot;Caught exception: &quot; &lt;&lt; error_.what()
109&lt;&lt; endl;</FONT></TT> <BR><TT><FONT COLOR="#000066">&nbsp;&nbsp;&nbsp;
110}</FONT></TT>
111</P>
112<P>The classes <I>Warning</I> and <I>Error</I> derive from the
113<I>Exception</I> class. Exceptions derived from <I>Warning</I> are
114thrown to represent non-fatal errors which may effect the
115completeness or quality of the result (e.g. one image provided as an
116argument to montage is defective). In most cases, a <I>Warning</I>
117exception may be ignored by catching it immediately, processing it
118(e.g. printing a diagnostic) and continuing on. Exceptions derived
119from <I>Error</I> are thrown to represent fatal errors that can not
120produce a valid result (e.g. attempting to read a file which does not
121exist).
122</P>
123<P STYLE="margin-bottom: 0in">The specific derived exception classes
124are shown in the following tables:
125</P>
126<P ALIGN=CENTER STYLE="margin-bottom: 0in"><B>Warning Sub-Classes</B></P>
127<TABLE WIDTH=100% BORDER=1 CELLPADDING=2 CELLSPACING=3>
128 <COL WIDTH=70*>
129 <COL WIDTH=186*>
130 <TR>
131 <TD WIDTH=27%>
132 <P ALIGN=CENTER><FONT SIZE=2><B>Warning</B></FONT></P>
133 </TD>
134 <TD WIDTH=73%>
135 <P ALIGN=CENTER><FONT SIZE=2><B>Warning Description</B></FONT></P>
136 </TD>
137 </TR>
138 <TR>
139 <TD WIDTH=27%>
140 <P ALIGN=CENTER><FONT SIZE=2>WarningUndefined</FONT></P>
141 </TD>
142 <TD WIDTH=73%>
143 <P><FONT SIZE=2>Unspecified warning type.</FONT></P>
144 </TD>
145 </TR>
146 <TR>
147 <TD WIDTH=27%>
148 <P ALIGN=CENTER><FONT SIZE=2>WarningBlob</FONT></P>
149 </TD>
150 <TD WIDTH=73%>
151 <P STYLE="font-weight: medium; text-decoration: none"><FONT SIZE=2>NOT
152 CURRENTLY USED</FONT></P>
153 </TD>
154 </TR>
155 <TR>
156 <TD WIDTH=27%>
157 <P ALIGN=CENTER><FONT SIZE=2>WarningCache</FONT></P>
158 </TD>
159 <TD WIDTH=73%>
160 <P STYLE="font-weight: medium; text-decoration: none"><FONT SIZE=2>NOT
161 CURRENTLY USED</FONT></P>
162 </TD>
163 </TR>
164 <TR>
165 <TD WIDTH=27%>
166 <P ALIGN=CENTER><FONT SIZE=2>WarningCoder</FONT></P>
167 </TD>
168 <TD WIDTH=73%>
169 <P><FONT SIZE=2>Warnings issued by some coders.</FONT></P>
170 </TD>
171 </TR>
172 <TR>
173 <TD WIDTH=27%>
174 <P ALIGN=CENTER><FONT SIZE=2>WarningConfigure</FONT></P>
175 </TD>
176 <TD WIDTH=73%>
177 <P STYLE="font-weight: medium; text-decoration: none"><FONT SIZE=2>NOT
178 CURRENTLY USED</FONT></P>
179 </TD>
180 </TR>
181 <TR>
182 <TD WIDTH=27%>
183 <P ALIGN=CENTER><FONT SIZE=2>WarningCorruptImage</FONT></P>
184 </TD>
185 <TD WIDTH=73%>
186 <P><FONT SIZE=2>Warning issued when an image is determined to be
187 corrupt.</FONT></P>
188 </TD>
189 </TR>
190 <TR>
191 <TD WIDTH=27%>
192 <P ALIGN=CENTER><FONT SIZE=2>WarningDelegate</FONT></P>
193 </TD>
194 <TD WIDTH=73%>
195 <P><FONT SIZE=2>Warnings reported by the delegate (interface to
196 external programs) subsystem.</FONT></P>
197 </TD>
198 </TR>
199 <TR>
200 <TD WIDTH=27%>
201 <P ALIGN=CENTER><FONT SIZE=2>WarningDraw</FONT></P>
202 </TD>
203 <TD WIDTH=73%>
204 <P><FONT SIZE=2>Warnings reported by the rendering subsystem.</FONT></P>
205 </TD>
206 </TR>
207 <TR>
208 <TD WIDTH=27%>
209 <P ALIGN=CENTER><FONT SIZE=2>WarningFileOpen</FONT></P>
210 </TD>
211 <TD WIDTH=73%>
212 <P><FONT SIZE=2>Warning reported when The image file could not be
213 opened (permission problem, wrong file type, or does not exist).</FONT></P>
214 </TD>
215 </TR>
216 <TR>
217 <TD WIDTH=27%>
218 <P ALIGN=CENTER><FONT SIZE=2>WarningImage</FONT></P>
219 </TD>
220 <TD WIDTH=73%>
221 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
222 </TD>
223 </TR>
224 <TR>
225 <TD WIDTH=27%>
226 <P ALIGN=CENTER><FONT SIZE=2>WarningMissingDelegate</FONT></P>
227 </TD>
228 <TD WIDTH=73%>
229 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
230 </TD>
231 </TR>
232 <TR>
233 <TD WIDTH=27%>
234 <P ALIGN=CENTER><FONT SIZE=2>WarningModule</FONT></P>
235 </TD>
236 <TD WIDTH=73%>
237 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
238 </TD>
239 </TR>
240 <TR>
241 <TD WIDTH=27%>
242 <P ALIGN=CENTER><FONT SIZE=2>WarningMonitor</FONT></P>
243 </TD>
244 <TD WIDTH=73%>
245 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
246 </TD>
247 </TR>
248 <TR>
249 <TD WIDTH=27%>
250 <P ALIGN=CENTER><FONT SIZE=2>WarningOption</FONT></P>
251 </TD>
252 <TD WIDTH=73%>
253 <P><FONT SIZE=2>Warning reported when an option is malformed or
254 out of range.</FONT></P>
255 </TD>
256 </TR>
257 <TR>
258 <TD WIDTH=27%>
259 <P ALIGN=CENTER><FONT SIZE=2>WarningRegistry</FONT></P>
260 </TD>
261 <TD WIDTH=73%>
262 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
263 </TD>
264 </TR>
265 <TR>
266 <TD WIDTH=27%>
267 <P ALIGN=CENTER><FONT SIZE=2>WarningResourceLimit</FONT></P>
268 </TD>
269 <TD WIDTH=73%>
270 <P><FONT SIZE=2>Warning reported when a program resource is
271 exhausted (e.g. not enough memory).</FONT></P>
272 </TD>
273 </TR>
274 <TR>
275 <TD WIDTH=27%>
276 <P ALIGN=CENTER><FONT SIZE=2>WarningStream</FONT></P>
277 </TD>
278 <TD WIDTH=73%>
279 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
280 </TD>
281 </TR>
282 <TR>
283 <TD WIDTH=27%>
284 <P ALIGN=CENTER><FONT SIZE=2>WarningType</FONT></P>
285 </TD>
286 <TD WIDTH=73%>
287 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
288 </TD>
289 </TR>
290 <TR>
291 <TD WIDTH=27%>
292 <P ALIGN=CENTER><FONT SIZE=2>WarningXServer</FONT></P>
293 </TD>
294 <TD WIDTH=73%>
295 <P><FONT SIZE=2>Warnings reported by the X11 subsystem.</FONT></P>
296 </TD>
297 </TR>
298</TABLE>
299<P STYLE="margin-bottom: 0in"><BR>
300</P>
301<P ALIGN=CENTER STYLE="margin-bottom: 0in"><B>Error Sub-Classes</B></P>
302<TABLE WIDTH=100% BORDER=1 CELLPADDING=2 CELLSPACING=3>
303 <COL WIDTH=71*>
304 <COL WIDTH=185*>
305 <TR>
306 <TD WIDTH=28%>
307 <P ALIGN=CENTER><FONT SIZE=2><B>Error</B></FONT></P>
308 </TD>
309 <TD WIDTH=72%>
310 <P ALIGN=CENTER><FONT SIZE=2><B>Error Description</B></FONT></P>
311 </TD>
312 </TR>
313 <TR>
314 <TD WIDTH=28%>
315 <P ALIGN=CENTER><FONT SIZE=2>ErrorUndefined</FONT></P>
316 </TD>
317 <TD WIDTH=72%>
318 <P><FONT SIZE=2>Unspecified error type.</FONT></P>
319 </TD>
320 </TR>
321 <TR>
322 <TD WIDTH=28%>
323 <P ALIGN=CENTER><FONT SIZE=2>ErrorBlob</FONT></P>
324 </TD>
325 <TD WIDTH=72%>
326 <P><FONT SIZE=2>Error reported by BLOB I/O subsystem.</FONT></P>
327 </TD>
328 </TR>
329 <TR>
330 <TD WIDTH=28%>
331 <P ALIGN=CENTER><FONT SIZE=2>ErrorCache</FONT></P>
332 </TD>
333 <TD WIDTH=72%>
334 <P><FONT SIZE=2>Error reported by the pixel cache subsystem.</FONT></P>
335 </TD>
336 </TR>
337 <TR>
338 <TD WIDTH=28%>
339 <P ALIGN=CENTER><FONT SIZE=2>ErrorCoder</FONT></P>
340 </TD>
341 <TD WIDTH=72%>
342 <P><FONT SIZE=2>Error reported by coders (image format support).</FONT></P>
343 </TD>
344 </TR>
345 <TR>
346 <TD WIDTH=28%>
347 <P ALIGN=CENTER><FONT SIZE=2>ErrorConfigure</FONT></P>
348 </TD>
349 <TD WIDTH=72%>
350 <P><FONT SIZE=2>Errors reported while loading configuration files.</FONT></P>
351 </TD>
352 </TR>
353 <TR>
354 <TD WIDTH=28%>
355 <P ALIGN=CENTER><FONT SIZE=2>ErrorCorruptImage</FONT></P>
356 </TD>
357 <TD WIDTH=72%>
358 <P><FONT SIZE=2>Error reported when the image file is corrupt.</FONT></P>
359 </TD>
360 </TR>
361 <TR>
362 <TD WIDTH=28%>
363 <P ALIGN=CENTER><FONT SIZE=2>ErrorDelegate</FONT></P>
364 </TD>
365 <TD WIDTH=72%>
366 <P><FONT SIZE=2>Errors reported by the delegate (interface to
367 external programs) subsystem.</FONT></P>
368 </TD>
369 </TR>
370 <TR>
371 <TD WIDTH=28%>
372 <P ALIGN=CENTER><FONT SIZE=2>ErrorDraw</FONT></P>
373 </TD>
374 <TD WIDTH=72%>
375 <P><FONT SIZE=2>Error reported while drawing on image.</FONT></P>
376 </TD>
377 </TR>
378 <TR>
379 <TD WIDTH=28%>
380 <P ALIGN=CENTER><FONT SIZE=2>ErrorFileOpen</FONT></P>
381 </TD>
382 <TD WIDTH=72%>
383 <P><FONT SIZE=2>Error reported when the image file can not be
384 opened.</FONT></P>
385 </TD>
386 </TR>
387 <TR>
388 <TD WIDTH=28%>
389 <P ALIGN=CENTER><FONT SIZE=2>ErrorImage</FONT></P>
390 </TD>
391 <TD WIDTH=72%>
392 <P><FONT SIZE=2>Errors reported while drawing.</FONT></P>
393 </TD>
394 </TR>
395 <TR>
396 <TD WIDTH=28%>
397 <P ALIGN=CENTER><FONT SIZE=2>ErrorMissingDelegate</FONT></P>
398 </TD>
399 <TD WIDTH=72%>
400 <P><FONT SIZE=2>Error reported when an add-on library or program
401 is necessary in order to support the requested operation.</FONT></P>
402 </TD>
403 </TR>
404 <TR>
405 <TD WIDTH=28%>
406 <P ALIGN=CENTER><FONT SIZE=2>ErrorModule</FONT></P>
407 </TD>
408 <TD WIDTH=72%>
409 <P><FONT SIZE=2>Errors reported by the module loader subsystem.</FONT></P>
410 </TD>
411 </TR>
412 <TR>
413 <TD WIDTH=28%>
414 <P ALIGN=CENTER><FONT SIZE=2>ErrorMonitor</FONT></P>
415 </TD>
416 <TD WIDTH=72%>
417 <P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
418 </TD>
419 </TR>
420 <TR>
421 <TD WIDTH=28%>
422 <P ALIGN=CENTER><FONT SIZE=2>ErrorOption</FONT></P>
423 </TD>
424 <TD WIDTH=72%>
425 <P><FONT SIZE=2>Error reported when an option is malformed or out
426 of range.</FONT></P>
427 </TD>
428 </TR>
429 <TR>
430 <TD WIDTH=28%>
431 <P ALIGN=CENTER><FONT SIZE=2>ErrorRegistry</FONT></P>
432 </TD>
433 <TD WIDTH=72%>
434 <P><FONT SIZE=2>Errors reported by the image/BLOB registry
435 subsystem.</FONT></P>
436 </TD>
437 </TR>
438 <TR>
439 <TD WIDTH=28%>
440 <P ALIGN=CENTER><FONT SIZE=2>ErrorResourceLimit</FONT></P>
441 </TD>
442 <TD WIDTH=72%>
443 <P><FONT SIZE=2>Error reported when a program resource is
444 exhausted (e.g. not enough memory).</FONT></P>
445 </TD>
446 </TR>
447 <TR>
448 <TD WIDTH=28%>
449 <P ALIGN=CENTER><FONT SIZE=2>ErrorStream</FONT></P>
450 </TD>
451 <TD WIDTH=72%>
452 <P><FONT SIZE=2>Errors reported by the pixel stream subsystem.</FONT></P>
453 </TD>
454 </TR>
455 <TR>
456 <TD WIDTH=28%>
457 <P ALIGN=CENTER><FONT SIZE=2>ErrorType</FONT></P>
458 </TD>
459 <TD WIDTH=72%>
460 <P><FONT SIZE=2>Errors reported by the type (font) rendering
461 subsystem.</FONT></P>
462 </TD>
463 </TR>
464 <TR>
465 <TD WIDTH=28%>
466 <P ALIGN=CENTER><FONT SIZE=2>ErrorXServer</FONT></P>
467 </TD>
468 <TD WIDTH=72%>
469 <P><FONT SIZE=2>Errors reported by the X11 subsystem.</FONT></P>
470 </TD>
471 </TR>
472</TABLE>
473<P><BR><BR>
474</P>
475</BODY>
476</HTML>