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 26                  <a href="#cairo-Error-handling.description" class="shortcut">Description</a>
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 31<div class="refnamediv"><table width="100%"><tr>
 32<td valign="top">
 33<h2><span class="refentrytitle"><a name="cairo-Error-handling.top_of_page"></a>Error handling</span></h2>
 34<p>Error handling � Decoding cairo's status</p>
 35</td>
 36<td valign="top" align="right"></td>
 37</tr></table></div>
 38<div class="refsynopsisdiv">
 39<a name="cairo-Error-handling.synopsis"></a><h2>Synopsis</h2>
 40<pre class="synopsis">enum                <a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t">cairo_status_t</a>;
 41const <span class="returnvalue">char</span> *        <a class="link" href="cairo-Error-handling.html#cairo-status-to-string" title="cairo_status_to_string ()">cairo_status_to_string</a>              (<em class="parameter"><code><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> status</code></em>);
 42<span class="returnvalue">void</span>                <a class="link" href="cairo-Error-handling.html#cairo-debug-reset-static-data" title="cairo_debug_reset_static_data ()">cairo_debug_reset_static_data</a>       (<em class="parameter"><code><span class="type">void</span></code></em>);
 43</pre>
 44</div>
 45<div class="refsect1">
 46<a name="cairo-Error-handling.description"></a><h2>Description</h2>
 47<p>
 48Cairo uses a single status type to represent all kinds of errors.  A status
 49value of <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> represents no error and has an integer value
 50of zero.  All other status values represent an error.
 51</p>
 52<p>
 53Cairo's error handling is designed to be easy to use and safe.  All major
 54cairo objects <em class="firstterm">retain</em> an error status internally which
 55can be queried anytime by the users using cairo*_status() calls.  In
 56the mean time, it is safe to call all cairo functions normally even if the
 57underlying object is in an error status.  This means that no error handling
 58code is required before or after each individual cairo function call.
 59</p>
 60</div>
 61<div class="refsect1">
 62<a name="cairo-Error-handling.details"></a><h2>Details</h2>
 63<div class="refsect2">
 64<a name="cairo-status-t"></a><h3>enum cairo_status_t</h3>
 65<pre class="programlisting">typedef enum {
 66    CAIRO_STATUS_SUCCESS = 0,
 67
 68    CAIRO_STATUS_NO_MEMORY,
 69    CAIRO_STATUS_INVALID_RESTORE,
 70    CAIRO_STATUS_INVALID_POP_GROUP,
 71    CAIRO_STATUS_NO_CURRENT_POINT,
 72    CAIRO_STATUS_INVALID_MATRIX,
 73    CAIRO_STATUS_INVALID_STATUS,
 74    CAIRO_STATUS_NULL_POINTER,
 75    CAIRO_STATUS_INVALID_STRING,
 76    CAIRO_STATUS_INVALID_PATH_DATA,
 77    CAIRO_STATUS_READ_ERROR,
 78    CAIRO_STATUS_WRITE_ERROR,
 79    CAIRO_STATUS_SURFACE_FINISHED,
 80    CAIRO_STATUS_SURFACE_TYPE_MISMATCH,
 81    CAIRO_STATUS_PATTERN_TYPE_MISMATCH,
 82    CAIRO_STATUS_INVALID_CONTENT,
 83    CAIRO_STATUS_INVALID_FORMAT,
 84    CAIRO_STATUS_INVALID_VISUAL,
 85    CAIRO_STATUS_FILE_NOT_FOUND,
 86    CAIRO_STATUS_INVALID_DASH,
 87    CAIRO_STATUS_INVALID_DSC_COMMENT,
 88    CAIRO_STATUS_INVALID_INDEX,
 89    CAIRO_STATUS_CLIP_NOT_REPRESENTABLE,
 90    CAIRO_STATUS_TEMP_FILE_ERROR,
 91    CAIRO_STATUS_INVALID_STRIDE,
 92    CAIRO_STATUS_FONT_TYPE_MISMATCH,
 93    CAIRO_STATUS_USER_FONT_IMMUTABLE,
 94    CAIRO_STATUS_USER_FONT_ERROR,
 95    CAIRO_STATUS_NEGATIVE_COUNT,
 96    CAIRO_STATUS_INVALID_CLUSTERS,
 97    CAIRO_STATUS_INVALID_SLANT,
 98    CAIRO_STATUS_INVALID_WEIGHT,
 99    CAIRO_STATUS_INVALID_SIZE,
100    CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED,
101    CAIRO_STATUS_DEVICE_TYPE_MISMATCH,
102    CAIRO_STATUS_DEVICE_ERROR,
103    CAIRO_STATUS_INVALID_MESH_CONSTRUCTION,
104    CAIRO_STATUS_DEVICE_FINISHED,
105
106    CAIRO_STATUS_LAST_STATUS
107} cairo_status_t;
108</pre>
109<p>
110<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> is used to indicate errors that can occur when
111using Cairo. In some cases it is returned directly by functions.
112but when using <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>, the last error, if any, is stored in
113the context and can be retrieved with <a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()"><code class="function">cairo_status()</code></a>.
114</p>
115<p>
116New entries may be added in future versions.  Use <a class="link" href="cairo-Error-handling.html#cairo-status-to-string" title="cairo_status_to_string ()"><code class="function">cairo_status_to_string()</code></a>
117to get a human-readable representation of an error message.
118</p>
119<div class="variablelist"><table border="0">
120<col align="left" valign="top">
121<tbody>
122<tr>
123<td><p><a name="CAIRO-STATUS-SUCCESS:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_SUCCESS</code></span></p></td>
124<td>no error has occurred (Since 1.0)
125</td>
126</tr>
127<tr>
128<td><p><a name="CAIRO-STATUS-NO-MEMORY:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></span></p></td>
129<td>out of memory (Since 1.0)
130</td>
131</tr>
132<tr>
133<td><p><a name="CAIRO-STATUS-INVALID-RESTORE:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_RESTORE</code></span></p></td>
134<td>cairo_restore() called without matching <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> (Since 1.0)
135</td>
136</tr>
137<tr>
138<td><p><a name="CAIRO-STATUS-INVALID-POP-GROUP:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_POP_GROUP</code></span></p></td>
139<td>no saved group to pop, i.e. <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a> without matching <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> (Since 1.0)
140</td>
141</tr>
142<tr>
143<td><p><a name="CAIRO-STATUS-NO-CURRENT-POINT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_NO_CURRENT_POINT</code></span></p></td>
144<td>no current point defined (Since 1.0)
145</td>
146</tr>
147<tr>
148<td><p><a name="CAIRO-STATUS-INVALID-MATRIX:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_MATRIX</code></span></p></td>
149<td>invalid matrix (not invertible) (Since 1.0)
150</td>
151</tr>
152<tr>
153<td><p><a name="CAIRO-STATUS-INVALID-STATUS:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_STATUS</code></span></p></td>
154<td>invalid value for an input <a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> (Since 1.0)
155</td>
156</tr>
157<tr>
158<td><p><a name="CAIRO-STATUS-NULL-POINTER:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_NULL_POINTER</code></span></p></td>
159<td>
160<a href="/usr/local/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> pointer (Since 1.0)
161</td>
162</tr>
163<tr>
164<td><p><a name="CAIRO-STATUS-INVALID-STRING:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_STRING</code></span></p></td>
165<td>input string not valid UTF-8 (Since 1.0)
166</td>
167</tr>
168<tr>
169<td><p><a name="CAIRO-STATUS-INVALID-PATH-DATA:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_PATH_DATA</code></span></p></td>
170<td>input path data not valid (Since 1.0)
171</td>
172</tr>
173<tr>
174<td><p><a name="CAIRO-STATUS-READ-ERROR:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_READ_ERROR</code></span></p></td>
175<td>error while reading from input stream (Since 1.0)
176</td>
177</tr>
178<tr>
179<td><p><a name="CAIRO-STATUS-WRITE-ERROR:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_WRITE_ERROR</code></span></p></td>
180<td>error while writing to output stream (Since 1.0)
181</td>
182</tr>
183<tr>
184<td><p><a name="CAIRO-STATUS-SURFACE-FINISHED:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_SURFACE_FINISHED</code></span></p></td>
185<td>target surface has been finished (Since 1.0)
186</td>
187</tr>
188<tr>
189<td><p><a name="CAIRO-STATUS-SURFACE-TYPE-MISMATCH:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_SURFACE_TYPE_MISMATCH</code></span></p></td>
190<td>the surface type is not appropriate for the operation (Since 1.0)
191</td>
192</tr>
193<tr>
194<td><p><a name="CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_PATTERN_TYPE_MISMATCH</code></span></p></td>
195<td>the pattern type is not appropriate for the operation (Since 1.0)
196</td>
197</tr>
198<tr>
199<td><p><a name="CAIRO-STATUS-INVALID-CONTENT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_CONTENT</code></span></p></td>
200<td>invalid value for an input <a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> (Since 1.0)
201</td>
202</tr>
203<tr>
204<td><p><a name="CAIRO-STATUS-INVALID-FORMAT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_FORMAT</code></span></p></td>
205<td>invalid value for an input <a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> (Since 1.0)
206</td>
207</tr>
208<tr>
209<td><p><a name="CAIRO-STATUS-INVALID-VISUAL:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_VISUAL</code></span></p></td>
210<td>invalid value for an input Visual* (Since 1.0)
211</td>
212</tr>
213<tr>
214<td><p><a name="CAIRO-STATUS-FILE-NOT-FOUND:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_FILE_NOT_FOUND</code></span></p></td>
215<td>file not found (Since 1.0)
216</td>
217</tr>
218<tr>
219<td><p><a name="CAIRO-STATUS-INVALID-DASH:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_DASH</code></span></p></td>
220<td>invalid value for a dash setting (Since 1.0)
221</td>
222</tr>
223<tr>
224<td><p><a name="CAIRO-STATUS-INVALID-DSC-COMMENT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_DSC_COMMENT</code></span></p></td>
225<td>invalid value for a DSC comment (Since 1.2)
226</td>
227</tr>
228<tr>
229<td><p><a name="CAIRO-STATUS-INVALID-INDEX:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_INDEX</code></span></p></td>
230<td>invalid index passed to getter (Since 1.4)
231</td>
232</tr>
233<tr>
234<td><p><a name="CAIRO-STATUS-CLIP-NOT-REPRESENTABLE:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_CLIP_NOT_REPRESENTABLE</code></span></p></td>
235<td>clip region not representable in desired format (Since 1.4)
236</td>
237</tr>
238<tr>
239<td><p><a name="CAIRO-STATUS-TEMP-FILE-ERROR:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_TEMP_FILE_ERROR</code></span></p></td>
240<td>error creating or writing to a temporary file (Since 1.6)
241</td>
242</tr>
243<tr>
244<td><p><a name="CAIRO-STATUS-INVALID-STRIDE:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_STRIDE</code></span></p></td>
245<td>invalid value for stride (Since 1.6)
246</td>
247</tr>
248<tr>
249<td><p><a name="CAIRO-STATUS-FONT-TYPE-MISMATCH:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_FONT_TYPE_MISMATCH</code></span></p></td>
250<td>the font type is not appropriate for the operation (Since 1.8)
251</td>
252</tr>
253<tr>
254<td><p><a name="CAIRO-STATUS-USER-FONT-IMMUTABLE:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_USER_FONT_IMMUTABLE</code></span></p></td>
255<td>the user-font is immutable (Since 1.8)
256</td>
257</tr>
258<tr>
259<td><p><a name="CAIRO-STATUS-USER-FONT-ERROR:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_USER_FONT_ERROR</code></span></p></td>
260<td>error occurred in a user-font callback function (Since 1.8)
261</td>
262</tr>
263<tr>
264<td><p><a name="CAIRO-STATUS-NEGATIVE-COUNT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_NEGATIVE_COUNT</code></span></p></td>
265<td>negative number used where it is not allowed (Since 1.8)
266</td>
267</tr>
268<tr>
269<td><p><a name="CAIRO-STATUS-INVALID-CLUSTERS:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_CLUSTERS</code></span></p></td>
270<td>input clusters do not represent the accompanying text and glyph array (Since 1.8)
271</td>
272</tr>
273<tr>
274<td><p><a name="CAIRO-STATUS-INVALID-SLANT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_SLANT</code></span></p></td>
275<td>invalid value for an input <a class="link" href="cairo-text.html#cairo-font-slant-t" title="enum cairo_font_slant_t"><span class="type">cairo_font_slant_t</span></a> (Since 1.8)
276</td>
277</tr>
278<tr>
279<td><p><a name="CAIRO-STATUS-INVALID-WEIGHT:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_WEIGHT</code></span></p></td>
280<td>invalid value for an input <a class="link" href="cairo-text.html#cairo-font-weight-t" title="enum cairo_font_weight_t"><span class="type">cairo_font_weight_t</span></a> (Since 1.8)
281</td>
282</tr>
283<tr>
284<td><p><a name="CAIRO-STATUS-INVALID-SIZE:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_SIZE</code></span></p></td>
285<td>invalid value (typically too big) for the size of the input (surface, pattern, etc.) (Since 1.10)
286</td>
287</tr>
288<tr>
289<td><p><a name="CAIRO-STATUS-USER-FONT-NOT-IMPLEMENTED:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED</code></span></p></td>
290<td>user-font method not implemented (Since 1.10)
291</td>
292</tr>
293<tr>
294<td><p><a name="CAIRO-STATUS-DEVICE-TYPE-MISMATCH:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_DEVICE_TYPE_MISMATCH</code></span></p></td>
295<td>the device type is not appropriate for the operation (Since 1.10)
296</td>
297</tr>
298<tr>
299<td><p><a name="CAIRO-STATUS-DEVICE-ERROR:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_DEVICE_ERROR</code></span></p></td>
300<td>an operation to the device caused an unspecified error (Since 1.10)
301</td>
302</tr>
303<tr>
304<td><p><a name="CAIRO-STATUS-INVALID-MESH-CONSTRUCTION:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_INVALID_MESH_CONSTRUCTION</code></span></p></td>
305<td>a mesh pattern
306  construction operation was used outside of a
307  <a class="link" href="cairo-cairo-pattern-t.html#cairo-mesh-pattern-begin-patch" title="cairo_mesh_pattern_begin_patch ()"><code class="function">cairo_mesh_pattern_begin_patch()</code></a>/<a class="link" href="cairo-cairo-pattern-t.html#cairo-mesh-pattern-end-patch" title="cairo_mesh_pattern_end_patch ()"><code class="function">cairo_mesh_pattern_end_patch()</code></a>
308  pair (Since 1.12)
309</td>
310</tr>
311<tr>
312<td><p><a name="CAIRO-STATUS-DEVICE-FINISHED:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_DEVICE_FINISHED</code></span></p></td>
313<td>target device has been finished (Since 1.12)
314</td>
315</tr>
316<tr>
317<td><p><a name="CAIRO-STATUS-LAST-STATUS:CAPS"></a><span class="term"><code class="literal">CAIRO_STATUS_LAST_STATUS</code></span></p></td>
318<td>this is a special value indicating the number of
319  status values defined in this enumeration.  When using this value, note
320  that the version of cairo at run-time may have additional status values
321  defined than the value of this symbol at compile-time. (Since 1.10)
322</td>
323</tr>
324</tbody>
325</table></div>
326<p class="since">Since 1.0</p>
327</div>
328<hr>
329<div class="refsect2">
330<a name="cairo-status-to-string"></a><h3>cairo_status_to_string ()</h3>
331<pre class="programlisting">const <span class="returnvalue">char</span> *        cairo_status_to_string              (<em class="parameter"><code><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> status</code></em>);</pre>
332<p>
333Provides a human-readable description of a <a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a>.
334</p>
335<div class="variablelist"><table border="0">
336<col align="left" valign="top">
337<tbody>
338<tr>
339<td><p><span class="term"><em class="parameter"><code>status</code></em>�:</span></p></td>
340<td>a cairo status</td>
341</tr>
342<tr>
343<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>�:</span></p></td>
344<td>a string representation of the status</td>
345</tr>
346</tbody>
347</table></div>
348<p class="since">Since 1.0</p>
349</div>
350<hr>
351<div class="refsect2">
352<a name="cairo-debug-reset-static-data"></a><h3>cairo_debug_reset_static_data ()</h3>
353<pre class="programlisting"><span class="returnvalue">void</span>                cairo_debug_reset_static_data       (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
354<p>
355Resets all static data within cairo to its original state,
356(ie. identical to the state at the time of program invocation). For
357example, all caches within cairo will be flushed empty.
358</p>
359<p>
360This function is intended to be useful when using memory-checking
361tools such as valgrind. When valgrind's memcheck analyzes a
362cairo-using program without a call to <a class="link" href="cairo-Error-handling.html#cairo-debug-reset-static-data" title="cairo_debug_reset_static_data ()"><code class="function">cairo_debug_reset_static_data()</code></a>,
363it will report all data reachable via cairo's static objects as
364"still reachable". Calling <a class="link" href="cairo-Error-handling.html#cairo-debug-reset-static-data" title="cairo_debug_reset_static_data ()"><code class="function">cairo_debug_reset_static_data()</code></a> just prior
365to program termination will make it easier to get squeaky clean
366reports from valgrind.
367</p>
368<p>
369WARNING: It is only safe to call this function when there are no
370active cairo objects remaining, (ie. the appropriate destroy
371functions have been called as necessary). If there are active cairo
372objects, this call is likely to cause a crash, (eg. an assertion
373failure due to a hash table being destroyed when non-empty).
374</p>
375<p class="since">Since 1.0</p>
376</div>
377</div>
378<div class="refsect1">
379<a name="cairo-Error-handling.see-also"></a><h2>See Also</h2>
380cairo_status(), <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a>, <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>,
381           <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-status" title="cairo_font_face_status ()"><code class="function">cairo_font_face_status()</code></a>, <a class="link" href="cairo-cairo-scaled-font-t.html#cairo-scaled-font-status" title="cairo_scaled_font_status ()"><code class="function">cairo_scaled_font_status()</code></a>, 
382           <a class="link" href="cairo-Regions.html#cairo-region-status" title="cairo_region_status ()"><code class="function">cairo_region_status()</code></a>
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