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Exception.html

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  1. <?xml version="1.0" encoding="utf-8" ?>
    2. 

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    3. 

  3. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    4. 

  4. <head>
    5. 

  5. <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    6. 

  6. <title>Magick++ API: Exceptions </title>
    7. 

  7. <link rel="stylesheet" href="magick.css" type="text/css" />
    8. 

  8. </head>
    9. 

  9. <body>
    10. 

  10. <div class="doc-section">
    11. 

  11. <h1 align="center">Magick::Exception Classes</h1>
    12. 

  12. <p><i>Exception</i> represents the base class of objects thrown when
    13. 

  13. Magick++reports an error. Magick++ throws C++ exceptions synchronous
    14. 

  14. with the operation where the error occurred. This allows errors to be
    15. 

  15. trapped within the enclosing code (perhaps the code to process a
    16. 

  16. single image) while allowing the code to be written with a simple
    17. 

  17. coding style.</p>
    18. 

  18. <p>A try/catch block should be placed around any sequence of
    19. 

  19. operations which can be considered an important body of work. For
    20. 

  20. example, if your program processes lists of images and some of these
    21. 

  21. images may be defective, by placing the try/catch block around the
    22. 

  22. entire sequence of code that processes one image (including
    23. 

  23. instantiating the image object), you can minimize the overhead of
    24. 

  24. error checking while ensuring that all objects created to deal with
    25. 

  25. that object are safely destroyed (C++ exceptions unroll the stack
    26. 

  26. until the enclosing try block, destroying any created objects). 
    27. 

  27. </p>
    28. 

  28. <p>The pseudo code for the main loop of your program may look like: 
    29. 

  29. </p>
    30. 

  30. <div class="viewport">
    31. 

  31. using namespace std;
    32. 

  32. for infile in list
    33. 

  33. {
    34. 

  34.   try {
    35. 

  35.     // Construct an image instance first so that we don't have to worry
    36. 

  36.     // about object construction failure due to a minor warning exception
    37. 

  37.     // being thrown.
    38. 

  38.     Magick::Image image; 
    39. 

  39.     try {
    40. 

  40.       // Try reading image file
    41. 

  41.       image.read(infile);
    42. 

  42.     }
    43. 

  43.     catch( Magick::WarningCoder &amp;warning )
    44. 

  44.     {
    45. 

  45.       // Process coder warning while loading file (e.g. TIFF warning)
    46. 

  46.       // Maybe the user will be interested in these warnings (or not).
    47. 

  47.       // If a warning is produced while loading an image, the image
    48. 

  48.       // can normally still be used (but not if the warning was about
    49. 

  49.       // something important!)
    50. 

  50.       cerr &lt;&lt; "Coder Warning: " &lt;&lt; warning.what() &lt;&lt; endl;
    51. 

  51.     }
    52. 

  52.     catch( Magick::Warning &amp;warning )
    53. 

  53.     {
    54. 

  54.       // Handle any other Magick++ warning.
    55. 

  55.       cerr &lt;&lt; "Warning: " &lt;&lt; warning.what() &lt;&lt; endl;
    56. 

  56.     }
    57. 

  57.     catch( Magick::ErrorFileOpen &amp;error ) 
    58. 

  58.     { 
    59. 

  59.       // Process Magick++ file open error
    60. 

  60.       cerr &lt;&lt; "Error: " &lt;&lt; error.what() &lt;&lt; endl;
    61. 

  61.       continue; // Try next image.
    62. 

  62.     }
    63. 

  63.     try {
    64. 

  64.       image.rotate(90);
    65. 

  65.       image.write("outfile");
    66. 

  66.     }
    67. 

  67.     catch ( MagickExeption &amp; error)
    68. 

  68.     {
    69. 

  69.        // Handle problem while rotating or writing outfile.
    70. 

  70.        cerr &lt;&lt; "Caught Magick++ exception: " &lt;&lt; error.what() &lt;&lt; endl;
    71. 

  71.     }
    72. 

  72.   }
    73. 

  73.   catch( std::exception &amp; error ) 
    74. 

  74.   { 
    75. 

  75.      // Process any other exceptions derived from standard C++ exception
    76. 

  76.      cerr &lt;&lt; "Caught C++ STD exception: " &lt;&lt; error.what() &lt;&lt; endl;
    77. 

  77.   } 
    78. 

  78.   catch( ... ) 
    79. 

  79.   { 
    80. 

  80.     // Process *any* exception (last-ditch effort). There is not a lot
    81. 

  81.     // you can do here other to retry the operation that failed, or exit
    82. 

  82.   }
    83. 

  83. }
    84. 

  84. </div>
    85. 

  85. <p>The desired location and number of try/catch blocks in your program
    86. 

  86. depends how sophisticated its error handling must be. Very simple
    87. 

  87. programs may use just one try/catch block.</p>
    88. 

  88. <p>The <i>Exception</i> class is derived from the C++ standard
    89. 

  89. exception class. This means that it contains a C++ string containing
    90. 

  90. additional information about the error (e.g to display to the user).
    91. 

  91. Obtain access to this string via the what() method.&#160; For
    92. 

  92. example: 
    93. 

  93. </p>
    94. 

  94. <pre class="code">
    95. 

  95. catch( Exception &amp; error_ ) 
    96. 

  96.     { 
    97. 

  97.       cout &lt;&lt; "Caught exception: " &lt;&lt; error_.what() &lt;&lt; endl; 
    98. 

  98.     }
    99. 

  99. </pre>
    100. 

  100. <p>The classes <i>Warning</i> and <i>Error</i> derive from the
    101. 

  101. <i>Exception</i> class. Exceptions derived from <i>Warning</i> are
    102. 

  102. thrown to represent non-fatal errors which may effect the
    103. 

  103. completeness or quality of the result (e.g. one image provided as an
    104. 

  104. argument to montage is defective). In most cases, a <i>Warning</i>
    105. 

  105. exception may be ignored by catching it immediately, processing it
    106. 

  106. (e.g. printing a diagnostic) and continuing on. Exceptions derived
    107. 

  107. from <i>Error</i> are thrown to represent fatal errors that can not
    108. 

  108. produce a valid result (e.g. attempting to read a file which does not
    109. 

  109. exist). 
    110. 

  110. </p>
    111. 

  111. <p style="margin-bottom: 0in">The specific derived exception classes
    112. 

  112. are shown in the following tables: 
    113. 

  113. </p>
    114. 

  114. <p align="center" style="margin-bottom: 0in"><b>Warning Sub-Classes</b></p>
    115. 

  115. <ul><table width="100%" border="1" cellpadding="2" cellspacing="3">
    116. 

  116. 	<col width="70*" />
    117. 

  117. 	<col width="186*" />
    118. 

  118. 	<tr>
    119. 

  119. 		<td width="27%">
    120. 

  120. 			<p align="center"><font size="2"><b>Warning</b></font></p>
    121. 

  121. 		</td>
    122. 

  122. 		<td width="73%">
    123. 

  123. 			<p align="center"><font size="2"><b>Warning Description</b></font></p>
    124. 

  124. 		</td>
    125. 

  125. 	</tr>
    126. 

  126. 	<tr>
    127. 

  127. 		<td width="27%">
    128. 

  128. 			<p align="center"><font size="2">WarningUndefined</font></p>
    129. 

  129. 		</td>
    130. 

  130. 		<td width="73%">
    131. 

  131. 			<p><font size="2">Unspecified warning type.</font></p>
    132. 

  132. 		</td>
    133. 

  133. 	</tr>
    134. 

  134. 	<tr>
    135. 

  135. 		<td width="27%">
    136. 

  136. 			<p align="center"><font size="2">WarningBlob</font></p>
    137. 

  137. 		</td>
    138. 

  138. 		<td width="73%">
    139. 

  139. 			<p style="font-weight: medium; text-decoration: none"><font size="2">NOT
    140. 

  140. 			CURRENTLY USED</font></p>
    141. 

  141. 		</td>
    142. 

  142. 	</tr>
    143. 

  143. 	<tr>
    144. 

  144. 		<td width="27%">
    145. 

  145. 			<p align="center"><font size="2">WarningCache</font></p>
    146. 

  146. 		</td>
    147. 

  147. 		<td width="73%">
    148. 

  148. 			<p style="font-weight: medium; text-decoration: none"><font size="2">NOT
    149. 

  149. 			CURRENTLY USED</font></p>
    150. 

  150. 		</td>
    151. 

  151. 	</tr>
    152. 

  152. 	<tr>
    153. 

  153. 		<td width="27%">
    154. 

  154. 			<p align="center"><font size="2">WarningCoder</font></p>
    155. 

  155. 		</td>
    156. 

  156. 		<td width="73%">
    157. 

  157. 			<p><font size="2">Warnings issued by some coders.</font></p>
    158. 

  158. 		</td>
    159. 

  159. 	</tr>
    160. 

  160. 	<tr>
    161. 

  161. 		<td width="27%">
    162. 

  162. 			<p align="center"><font size="2">WarningConfigure</font></p>
    163. 

  163. 		</td>
    164. 

  164. 		<td width="73%">
    165. 

  165. 			<p style="font-weight: medium; text-decoration: none"><font size="2">NOT
    166. 

  166. 			CURRENTLY USED</font></p>
    167. 

  167. 		</td>
    168. 

  168. 	</tr>
    169. 

  169. 	<tr>
    170. 

  170. 		<td width="27%">
    171. 

  171. 			<p align="center"><font size="2">WarningCorruptImage</font></p>
    172. 

  172. 		</td>
    173. 

  173. 		<td width="73%">
    174. 

  174. 			<p><font size="2">Warning issued when an image is determined to be
    175. 

  175. 			corrupt.</font></p>
    176. 

  176. 		</td>
    177. 

  177. 	</tr>
    178. 

  178. 	<tr>
    179. 

  179. 		<td width="27%">
    180. 

  180. 			<p align="center"><font size="2">WarningDelegate</font></p>
    181. 

  181. 		</td>
    182. 

  182. 		<td width="73%">
    183. 

  183. 			<p><font size="2">Warnings reported by the delegate (interface to
    184. 

  184. 			external programs) subsystem.</font></p>
    185. 

  185. 		</td>
    186. 

  186. 	</tr>
    187. 

  187. 	<tr>
    188. 

  188. 		<td width="27%">
    189. 

  189. 			<p align="center"><font size="2">WarningDraw</font></p>
    190. 

  190. 		</td>
    191. 

  191. 		<td width="73%">
    192. 

  192. 			<p><font size="2">Warnings reported by the rendering subsystem.</font></p>
    193. 

  193. 		</td>
    194. 

  194. 	</tr>
    195. 

  195. 	<tr>
    196. 

  196. 		<td width="27%">
    197. 

  197. 			<p align="center"><font size="2">WarningFileOpen</font></p>
    198. 

  198. 		</td>
    199. 

  199. 		<td width="73%">
    200. 

  200. 			<p><font size="2">Warning reported when The image file could not be
    201. 

  201. 			opened (permission problem, wrong file type, or does not exist).</font></p>
    202. 

  202. 		</td>
    203. 

  203. 	</tr>
    204. 

  204. 	<tr>
    205. 

  205. 		<td width="27%">
    206. 

  206. 			<p align="center"><font size="2">WarningImage</font></p>
    207. 

  207. 		</td>
    208. 

  208. 		<td width="73%">
    209. 

  209. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    210. 

  210. 		</td>
    211. 

  211. 	</tr>
    212. 

  212. 	<tr>
    213. 

  213. 		<td width="27%">
    214. 

  214. 			<p align="center"><font size="2">WarningMissingDelegate</font></p>
    215. 

  215. 		</td>
    216. 

  216. 		<td width="73%">
    217. 

  217. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    218. 

  218. 		</td>
    219. 

  219. 	</tr>
    220. 

  220. 	<tr>
    221. 

  221. 		<td width="27%">
    222. 

  222. 			<p align="center"><font size="2">WarningModule</font></p>
    223. 

  223. 		</td>
    224. 

  224. 		<td width="73%">
    225. 

  225. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    226. 

  226. 		</td>
    227. 

  227. 	</tr>
    228. 

  228. 	<tr>
    229. 

  229. 		<td width="27%">
    230. 

  230. 			<p align="center"><font size="2">WarningMonitor</font></p>
    231. 

  231. 		</td>
    232. 

  232. 		<td width="73%">
    233. 

  233. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    234. 

  234. 		</td>
    235. 

  235. 	</tr>
    236. 

  236. 	<tr>
    237. 

  237. 		<td width="27%">
    238. 

  238. 			<p align="center"><font size="2">WarningOption</font></p>
    239. 

  239. 		</td>
    240. 

  240. 		<td width="73%">
    241. 

  241. 			<p><font size="2">Warning reported when an option is malformed or
    242. 

  242. 			out of range.</font></p>
    243. 

  243. 		</td>
    244. 

  244. 	</tr>
    245. 

  245. 	<tr>
    246. 

  246. 		<td width="27%">
    247. 

  247. 			<p align="center"><font size="2">WarningRegistry</font></p>
    248. 

  248. 		</td>
    249. 

  249. 		<td width="73%">
    250. 

  250. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    251. 

  251. 		</td>
    252. 

  252. 	</tr>
    253. 

  253. 	<tr>
    254. 

  254. 		<td width="27%">
    255. 

  255. 			<p align="center"><font size="2">WarningResourceLimit</font></p>
    256. 

  256. 		</td>
    257. 

  257. 		<td width="73%">
    258. 

  258. 			<p><font size="2">Warning reported when a program resource is
    259. 

  259. 			exhausted (e.g. not enough memory).</font></p>
    260. 

  260. 		</td>
    261. 

  261. 	</tr>
    262. 

  262. 	<tr>
    263. 

  263. 		<td width="27%">
    264. 

  264. 			<p align="center"><font size="2">WarningStream</font></p>
    265. 

  265. 		</td>
    266. 

  266. 		<td width="73%">
    267. 

  267. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    268. 

  268. 		</td>
    269. 

  269. 	</tr>
    270. 

  270. 	<tr>
    271. 

  271. 		<td width="27%">
    272. 

  272. 			<p align="center"><font size="2">WarningType</font></p>
    273. 

  273. 		</td>
    274. 

  274. 		<td width="73%">
    275. 

  275. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    276. 

  276. 		</td>
    277. 

  277. 	</tr>
    278. 

  278. 	<tr>
    279. 

  279. 		<td width="27%">
    280. 

  280. 			<p align="center"><font size="2">WarningXServer</font></p>
    281. 

  281. 		</td>
    282. 

  282. 		<td width="73%">
    283. 

  283. 			<p><font size="2">Warnings reported by the X11 subsystem.</font></p>
    284. 

  284. 		</td>
    285. 

  285. 	</tr>
    286. 

  286. </table></ul>
    287. 

  287. <p style="margin-bottom: 0in"><br />
    288. 

  288. </p>
    289. 

  289. <p align="center" style="margin-bottom: 0in"><b>Error Sub-Classes</b></p>
    290. 

  290. <ul><table width="100%" border="1" cellpadding="2" cellspacing="3">
    291. 

  291. 	<col width="71*" />
    292. 

  292. 	<col width="185*" />
    293. 

  293. 	<tr>
    294. 

  294. 		<td width="28%">
    295. 

  295. 			<p align="center"><font size="2"><b>Error</b></font></p>
    296. 

  296. 		</td>
    297. 

  297. 		<td width="72%">
    298. 

  298. 			<p align="center"><font size="2"><b>Error Description</b></font></p>
    299. 

  299. 		</td>
    300. 

  300. 	</tr>
    301. 

  301. 	<tr>
    302. 

  302. 		<td width="28%">
    303. 

  303. 			<p align="center"><font size="2">ErrorUndefined</font></p>
    304. 

  304. 		</td>
    305. 

  305. 		<td width="72%">
    306. 

  306. 			<p><font size="2">Unspecified error type.</font></p>
    307. 

  307. 		</td>
    308. 

  308. 	</tr>
    309. 

  309. 	<tr>
    310. 

  310. 		<td width="28%">
    311. 

  311. 			<p align="center"><font size="2">ErrorBlob</font></p>
    312. 

  312. 		</td>
    313. 

  313. 		<td width="72%">
    314. 

  314. 			<p><font size="2">Error reported by BLOB I/O subsystem.</font></p>
    315. 

  315. 		</td>
    316. 

  316. 	</tr>
    317. 

  317. 	<tr>
    318. 

  318. 		<td width="28%">
    319. 

  319. 			<p align="center"><font size="2">ErrorCache</font></p>
    320. 

  320. 		</td>
    321. 

  321. 		<td width="72%">
    322. 

  322. 			<p><font size="2">Error reported by the pixel cache subsystem.</font></p>
    323. 

  323. 		</td>
    324. 

  324. 	</tr>
    325. 

  325. 	<tr>
    326. 

  326. 		<td width="28%">
    327. 

  327. 			<p align="center"><font size="2">ErrorCoder</font></p>
    328. 

  328. 		</td>
    329. 

  329. 		<td width="72%">
    330. 

  330. 			<p><font size="2">Error reported by coders (image format support).</font></p>
    331. 

  331. 		</td>
    332. 

  332. 	</tr>
    333. 

  333. 	<tr>
    334. 

  334. 		<td width="28%">
    335. 

  335. 			<p align="center"><font size="2">ErrorConfigure</font></p>
    336. 

  336. 		</td>
    337. 

  337. 		<td width="72%">
    338. 

  338. 			<p><font size="2">Errors reported while loading configuration files.</font></p>
    339. 

  339. 		</td>
    340. 

  340. 	</tr>
    341. 

  341. 	<tr>
    342. 

  342. 		<td width="28%">
    343. 

  343. 			<p align="center"><font size="2">ErrorCorruptImage</font></p>
    344. 

  344. 		</td>
    345. 

  345. 		<td width="72%">
    346. 

  346. 			<p><font size="2">Error reported when the image file is corrupt.</font></p>
    347. 

  347. 		</td>
    348. 

  348. 	</tr>
    349. 

  349. 	<tr>
    350. 

  350. 		<td width="28%">
    351. 

  351. 			<p align="center"><font size="2">ErrorDelegate</font></p>
    352. 

  352. 		</td>
    353. 

  353. 		<td width="72%">
    354. 

  354. 			<p><font size="2">Errors reported by the delegate (interface to
    355. 

  355. 			external programs) subsystem.</font></p>
    356. 

  356. 		</td>
    357. 

  357. 	</tr>
    358. 

  358. 	<tr>
    359. 

  359. 		<td width="28%">
    360. 

  360. 			<p align="center"><font size="2">ErrorDraw</font></p>
    361. 

  361. 		</td>
    362. 

  362. 		<td width="72%">
    363. 

  363. 			<p><font size="2">Error reported while drawing on image.</font></p>
    364. 

  364. 		</td>
    365. 

  365. 	</tr>
    366. 

  366. 	<tr>
    367. 

  367. 		<td width="28%">
    368. 

  368. 			<p align="center"><font size="2">ErrorFileOpen</font></p>
    369. 

  369. 		</td>
    370. 

  370. 		<td width="72%">
    371. 

  371. 			<p><font size="2">Error reported when the image file can not be
    372. 

  372. 			opened.</font></p>
    373. 

  373. 		</td>
    374. 

  374. 	</tr>
    375. 

  375. 	<tr>
    376. 

  376. 		<td width="28%">
    377. 

  377. 			<p align="center"><font size="2">ErrorImage</font></p>
    378. 

  378. 		</td>
    379. 

  379. 		<td width="72%">
    380. 

  380. 			<p><font size="2">Errors reported while drawing.</font></p>
    381. 

  381. 		</td>
    382. 

  382. 	</tr>
    383. 

  383. 	<tr>
    384. 

  384. 		<td width="28%">
    385. 

  385. 			<p align="center"><font size="2">ErrorMissingDelegate</font></p>
    386. 

  386. 		</td>
    387. 

  387. 		<td width="72%">
    388. 

  388. 			<p><font size="2">Error reported when an add-on library or program
    389. 

  389. 			is necessary in order to support the requested operation.</font></p>
    390. 

  390. 		</td>
    391. 

  391. 	</tr>
    392. 

  392. 	<tr>
    393. 

  393. 		<td width="28%">
    394. 

  394. 			<p align="center"><font size="2">ErrorModule</font></p>
    395. 

  395. 		</td>
    396. 

  396. 		<td width="72%">
    397. 

  397. 			<p><font size="2">Errors reported by the module loader subsystem.</font></p>
    398. 

  398. 		</td>
    399. 

  399. 	</tr>
    400. 

  400. 	<tr>
    401. 

  401. 		<td width="28%">
    402. 

  402. 			<p align="center"><font size="2">ErrorMonitor</font></p>
    403. 

  403. 		</td>
    404. 

  404. 		<td width="72%">
    405. 

  405. 			<p style="font-weight: medium"><font size="2">NOT CURRENTLY USED</font></p>
    406. 

  406. 		</td>
    407. 

  407. 	</tr>
    408. 

  408. 	<tr>
    409. 

  409. 		<td width="28%">
    410. 

  410. 			<p align="center"><font size="2">ErrorOption</font></p>
    411. 

  411. 		</td>
    412. 

  412. 		<td width="72%">
    413. 

  413. 			<p><font size="2">Error reported when an option is malformed or out
    414. 

  414. 			of range.</font></p>
    415. 

  415. 		</td>
    416. 

  416. 	</tr>
    417. 

  417. 	<tr>
    418. 

  418. 		<td width="28%">
    419. 

  419. 			<p align="center"><font size="2">ErrorRegistry</font></p>
    420. 

  420. 		</td>
    421. 

  421. 		<td width="72%">
    422. 

  422. 			<p><font size="2">Errors reported by the image/BLOB registry
    423. 

  423. 			subsystem.</font></p>
    424. 

  424. 		</td>
    425. 

  425. 	</tr>
    426. 

  426. 	<tr>
    427. 

  427. 		<td width="28%">
    428. 

  428. 			<p align="center"><font size="2">ErrorResourceLimit</font></p>
    429. 

  429. 		</td>
    430. 

  430. 		<td width="72%">
    431. 

  431. 			<p><font size="2">Error reported when a program resource is
    432. 

  432. 			exhausted (e.g. not enough memory).</font></p>
    433. 

  433. 		</td>
    434. 

  434. 	</tr>
    435. 

  435. 	<tr>
    436. 

  436. 		<td width="28%">
    437. 

  437. 			<p align="center"><font size="2">ErrorStream</font></p>
    438. 

  438. 		</td>
    439. 

  439. 		<td width="72%">
    440. 

  440. 			<p><font size="2">Errors reported by the pixel stream subsystem.</font></p>
    441. 

  441. 		</td>
    442. 

  442. 	</tr>
    443. 

  443. 	<tr>
    444. 

  444. 		<td width="28%">
    445. 

  445. 			<p align="center"><font size="2">ErrorType</font></p>
    446. 

  446. 		</td>
    447. 

  447. 		<td width="72%">
    448. 

  448. 			<p><font size="2">Errors reported by the type (font) rendering
    449. 

  449. 			subsystem.</font></p>
    450. 

  450. 		</td>
    451. 

  451. 	</tr>
    452. 

  452. 	<tr>
    453. 

  453. 		<td width="28%">
    454. 

  454. 			<p align="center"><font size="2">ErrorXServer</font></p>
    455. 

  455. 		</td>
    456. 

  456. 		<td width="72%">
    457. 

  457. 			<p><font size="2">Errors reported by the X11 subsystem.</font></p>
    458. 

  458. 		</td>
    459. 

  459. 	</tr>
    460. 

  460. </table></ul>
    461. 

  461. <p><br /><br />
    462. 

  462. </p>
    463. 

  463. </div>
    464. 

  464. </body>
    465. 

  465. </html>
    466.