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authorLeo Tenenbaum <pommicket@gmail.com>2018-08-20 21:12:06 -0400
committerLeo Tenenbaum <pommicket@gmail.com>2018-08-20 21:12:06 -0400
commit63e87c2d0c9d263f14c77b68f85c67d46ece82a9 (patch)
tree6260365cbf7d24f37d27669e8538227fcb72e243 /gtk+-mingw/share/gtk-doc/html/glib/glib-Warnings-and-Assertions.html
parenta4460f6d9453bbd7e584937686449cef3e19f052 (diff)
Removed gtk+ docsHEADmaster
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-<a href="#glib-Warnings-and-Assertions.synopsis" class="shortcut">Top</a>
-  | 
- <a href="#glib-Warnings-and-Assertions.description" class="shortcut">Description</a>
-</td></tr>
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-<div class="refentry">
-<a name="glib-Warnings-and-Assertions"></a><div class="titlepage"></div>
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-<td valign="top">
-<h2><span class="refentrytitle"><a name="glib-Warnings-and-Assertions.top_of_page"></a>Message Output and Debugging Functions</span></h2>
-<p>Message Output and Debugging Functions — functions to output messages and help debug applications</p>
-</td>
-<td valign="top" align="right"></td>
-</tr></table></div>
-<div class="refsynopsisdiv">
-<a name="glib-Warnings-and-Assertions.synopsis"></a><h2>Synopsis</h2>
-<pre class="synopsis">
-#include &lt;glib.h&gt;
-
-<span class="returnvalue">void</span> <a class="link" href="glib-Warnings-and-Assertions.html#g-print" title="g_print ()">g_print</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
- <em class="parameter"><code>...</code></em>);
-<a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="returnvalue">GPrintFunc</span></a> <a class="link" href="glib-Warnings-and-Assertions.html#g-set-print-handler" title="g_set_print_handler ()">g_set_print_handler</a> (<em class="parameter"><code><a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="type">GPrintFunc</span></a> func</code></em>);
-<span class="returnvalue">void</span> (<a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()">*GPrintFunc</a>) (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);
-
-<span class="returnvalue">void</span> <a class="link" href="glib-Warnings-and-Assertions.html#g-printerr" title="g_printerr ()">g_printerr</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
- <em class="parameter"><code>...</code></em>);
-<a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="returnvalue">GPrintFunc</span></a> <a class="link" href="glib-Warnings-and-Assertions.html#g-set-printerr-handler" title="g_set_printerr_handler ()">g_set_printerr_handler</a> (<em class="parameter"><code><a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="type">GPrintFunc</span></a> func</code></em>);
-
-#define <a class="link" href="glib-Warnings-and-Assertions.html#g-return-if-fail" title="g_return_if_fail()">g_return_if_fail</a> (expr)
-#define <a class="link" href="glib-Warnings-and-Assertions.html#g-return-val-if-fail" title="g_return_val_if_fail()">g_return_val_if_fail</a> (expr,
- val)
-#define <a class="link" href="glib-Warnings-and-Assertions.html#g-return-if-reached" title="g_return_if_reached">g_return_if_reached</a>
-#define <a class="link" href="glib-Warnings-and-Assertions.html#g-return-val-if-reached" title="g_return_val_if_reached()">g_return_val_if_reached</a> (val)
-#define <a class="link" href="glib-Warnings-and-Assertions.html#g-warn-if-fail" title="g_warn_if_fail()">g_warn_if_fail</a> (expr)
-#define <a class="link" href="glib-Warnings-and-Assertions.html#g-warn-if-reached" title="g_warn_if_reached">g_warn_if_reached</a>
-
-<span class="returnvalue">void</span> <a class="link" href="glib-Warnings-and-Assertions.html#g-on-error-query" title="g_on_error_query ()">g_on_error_query</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *prg_name</code></em>);
-<span class="returnvalue">void</span> <a class="link" href="glib-Warnings-and-Assertions.html#g-on-error-stack-trace" title="g_on_error_stack_trace ()">g_on_error_stack_trace</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *prg_name</code></em>);
-
-#define <a class="link" href="glib-Warnings-and-Assertions.html#G-BREAKPOINT:CAPS" title="G_BREAKPOINT">G_BREAKPOINT</a>
-</pre>
-</div>
-<div class="refsect1">
-<a name="glib-Warnings-and-Assertions.description"></a><h2>Description</h2>
-<p>
-These functions provide support for outputting messages.
-</p>
-<p>
-The <code class="function">g_return</code> family of macros (<a class="link" href="glib-Warnings-and-Assertions.html#g-return-if-fail" title="g_return_if_fail()"><code class="function">g_return_if_fail()</code></a>,
-<a class="link" href="glib-Warnings-and-Assertions.html#g-return-val-if-fail" title="g_return_val_if_fail()"><code class="function">g_return_val_if_fail()</code></a>, <a class="link" href="glib-Warnings-and-Assertions.html#g-return-if-reached" title="g_return_if_reached"><code class="function">g_return_if_reached()</code></a>, <a class="link" href="glib-Warnings-and-Assertions.html#g-return-val-if-reached" title="g_return_val_if_reached()"><code class="function">g_return_val_if_reached()</code></a>)
-should only be used for programming errors, a typical use case is
-checking for invalid parameters at the beginning of a public function.
-They should not be used if you just mean "if (error) return", they
-should only be used if you mean "if (bug in program) return".
-The program behavior is generally considered undefined after one
-of these checks fails. They are not intended for normal control
-flow, only to give a perhaps-helpful warning before giving up.
-</p>
-</div>
-<div class="refsect1">
-<a name="glib-Warnings-and-Assertions.details"></a><h2>Details</h2>
-<div class="refsect2">
-<a name="g-print"></a><h3>g_print ()</h3>
-<pre class="programlisting"><span class="returnvalue">void</span> g_print (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
- <em class="parameter"><code>...</code></em>);</pre>
-<p>
-Outputs a formatted message via the print handler.
-The default print handler simply outputs the message to stdout.
-</p>
-<p>
-<a class="link" href="glib-Warnings-and-Assertions.html#g-print" title="g_print ()"><code class="function">g_print()</code></a> should not be used from within libraries for debugging
-messages, since it may be redirected by applications to special
-purpose message windows or even files. Instead, libraries should
-use <a class="link" href="glib-Message-Logging.html#g-log" title="g_log ()"><code class="function">g_log()</code></a>, or the convenience functions <a class="link" href="glib-Message-Logging.html#g-message" title="g_message()"><code class="function">g_message()</code></a>, <a class="link" href="glib-Message-Logging.html#g-warning" title="g_warning()"><code class="function">g_warning()</code></a>
-and <a class="link" href="glib-Message-Logging.html#g-error" title="g_error()"><code class="function">g_error()</code></a>.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
-<td>the message format. See the <code class="function">printf()</code> documentation</td>
-</tr>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
-<td>the parameters to insert into the format string</td>
-</tr>
-</tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-set-print-handler"></a><h3>g_set_print_handler ()</h3>
-<pre class="programlisting"><a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="returnvalue">GPrintFunc</span></a> g_set_print_handler (<em class="parameter"><code><a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="type">GPrintFunc</span></a> func</code></em>);</pre>
-<p>
-Sets the print handler.
-</p>
-<p>
-Any messages passed to <a class="link" href="glib-Warnings-and-Assertions.html#g-print" title="g_print ()"><code class="function">g_print()</code></a> will be output via
-the new handler. The default handler simply outputs
-the message to stdout. By providing your own handler
-you can redirect the output, to a GTK+ widget or a
-log file for example.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
-<td>the new print handler</td>
-</tr>
-<tr>
-<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
-<td>the old print handler</td>
-</tr>
-</tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="GPrintFunc"></a><h3>GPrintFunc ()</h3>
-<pre class="programlisting"><span class="returnvalue">void</span> (*GPrintFunc) (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);</pre>
-<p>
-Specifies the type of the print handler functions.
-These are called with the complete formatted string to output.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
-<td>the message to output</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-printerr"></a><h3>g_printerr ()</h3>
-<pre class="programlisting"><span class="returnvalue">void</span> g_printerr (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
- <em class="parameter"><code>...</code></em>);</pre>
-<p>
-Outputs a formatted message via the error message handler.
-The default handler simply outputs the message to stderr.
-</p>
-<p>
-<a class="link" href="glib-Warnings-and-Assertions.html#g-printerr" title="g_printerr ()"><code class="function">g_printerr()</code></a> should not be used from within libraries.
-Instead <a class="link" href="glib-Message-Logging.html#g-log" title="g_log ()"><code class="function">g_log()</code></a> should be used, or the convenience functions
-<a class="link" href="glib-Message-Logging.html#g-message" title="g_message()"><code class="function">g_message()</code></a>, <a class="link" href="glib-Message-Logging.html#g-warning" title="g_warning()"><code class="function">g_warning()</code></a> and <a class="link" href="glib-Message-Logging.html#g-error" title="g_error()"><code class="function">g_error()</code></a>.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
-<td>the message format. See the <code class="function">printf()</code> documentation</td>
-</tr>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
-<td>the parameters to insert into the format string</td>
-</tr>
-</tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-set-printerr-handler"></a><h3>g_set_printerr_handler ()</h3>
-<pre class="programlisting"><a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="returnvalue">GPrintFunc</span></a> g_set_printerr_handler (<em class="parameter"><code><a class="link" href="glib-Warnings-and-Assertions.html#GPrintFunc" title="GPrintFunc ()"><span class="type">GPrintFunc</span></a> func</code></em>);</pre>
-<p>
-Sets the handler for printing error messages.
-</p>
-<p>
-Any messages passed to <a class="link" href="glib-Warnings-and-Assertions.html#g-printerr" title="g_printerr ()"><code class="function">g_printerr()</code></a> will be output via
-the new handler. The default handler simply outputs the
-message to stderr. By providing your own handler you can
-redirect the output, to a GTK+ widget or a log file for
-example.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
-<td>the new error message handler</td>
-</tr>
-<tr>
-<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
-<td>the old error message handler</td>
-</tr>
-</tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-return-if-fail"></a><h3>g_return_if_fail()</h3>
-<pre class="programlisting">#define g_return_if_fail(expr)</pre>
-<p>
-Verifies that the expression evaluates to <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>. If the expression
-evaluates to <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, a critical message is logged and the current
-function returns. This can only be used in functions which do not
-return a value.
-</p>
-<p>
-If G_DISABLE_CHECKS is defined then the check is not performed. You
-should therefore not depend on any side effects of <em class="parameter"><code>expr</code></em>.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><em class="parameter"><code>expr</code></em> :</span></p></td>
-<td>the expression to check</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-return-val-if-fail"></a><h3>g_return_val_if_fail()</h3>
-<pre class="programlisting">#define g_return_val_if_fail(expr,val)</pre>
-<p>
-Verifies that the expression evaluates to <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>. If the expression
-evaluates to <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>, a critical message is logged and <em class="parameter"><code>val</code></em> is
-returned from the current function.
-</p>
-<p>
-If G_DISABLE_CHECKS is defined then the check is not performed. You
-should therefore not depend on any side effects of <em class="parameter"><code>expr</code></em>.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>expr</code></em> :</span></p></td>
-<td>the expression to check</td>
-</tr>
-<tr>
-<td><p><span class="term"><em class="parameter"><code>val</code></em> :</span></p></td>
-<td>the value to return from the current function
-if the expression is not true</td>
-</tr>
-</tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-return-if-reached"></a><h3>g_return_if_reached</h3>
-<pre class="programlisting">#define g_return_if_reached()</pre>
-<p>
-Logs a critical message and returns from the current function.
-This can only be used in functions which do not return a value.
-</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-return-val-if-reached"></a><h3>g_return_val_if_reached()</h3>
-<pre class="programlisting">#define g_return_val_if_reached(val)</pre>
-<p>
-Logs a critical message and returns <em class="parameter"><code>val</code></em>.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><em class="parameter"><code>val</code></em> :</span></p></td>
-<td>the value to return from the current function</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-warn-if-fail"></a><h3>g_warn_if_fail()</h3>
-<pre class="programlisting">#define g_warn_if_fail(expr)</pre>
-<p>
-Logs a warning if the expression is not true.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><em class="parameter"><code>expr</code></em> :</span></p></td>
-<td>the expression to check</td>
-</tr></tbody>
-</table></div>
-<p class="since">Since 2.16</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-warn-if-reached"></a><h3>g_warn_if_reached</h3>
-<pre class="programlisting">#define g_warn_if_reached()</pre>
-<p>
-Logs a critical warning.
-</p>
-<p class="since">Since 2.16</p>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-on-error-query"></a><h3>g_on_error_query ()</h3>
-<pre class="programlisting"><span class="returnvalue">void</span> g_on_error_query (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *prg_name</code></em>);</pre>
-<p>
-Prompts the user with
-<code class="computeroutput">[E]xit, [H]alt, show [S]tack trace or [P]roceed</code>.
-This function is intended to be used for debugging use only.
-The following example shows how it can be used together with
-the <a class="link" href="glib-Message-Logging.html#g-log" title="g_log ()"><code class="function">g_log()</code></a> functions.
-</p>
-<p>
-</p>
-<div class="informalexample"><pre class="programlisting">
-#include &lt;glib.h&gt;
-
-static void
-log_handler (const gchar *log_domain,
- GLogLevelFlags log_level,
- const gchar *message,
- gpointer user_data)
-{
- g_log_default_handler (log_domain, log_level, message, user_data);
-
- g_on_error_query (MY_PROGRAM_NAME);
-}
-
-int
-main (int argc, char *argv[])
-{
- g_log_set_handler (MY_LOG_DOMAIN,
- G_LOG_LEVEL_WARNING |
- G_LOG_LEVEL_ERROR |
- G_LOG_LEVEL_CRITICAL,
- log_handler,
- NULL);
- /* ... */
-</pre></div>
-<p>
-</p>
-<p>
-If [E]xit is selected, the application terminates with a call
-to <code class="literal">_exit(0)</code>.
-</p>
-<p>
-If [S]tack trace is selected, <a class="link" href="glib-Warnings-and-Assertions.html#g-on-error-stack-trace" title="g_on_error_stack_trace ()"><code class="function">g_on_error_stack_trace()</code></a> is called.
-This invokes <span class="command"><strong>gdb</strong></span>, which attaches to the current
-process and shows a stack trace. The prompt is then shown again.
-</p>
-<p>
-If [P]roceed is selected, the function returns.
-</p>
-<p>
-This function may cause different actions on non-UNIX platforms.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><em class="parameter"><code>prg_name</code></em> :</span></p></td>
-<td>the program name, needed by <span class="command"><strong>gdb</strong></span>
-for the [S]tack trace option. If <em class="parameter"><code>prg_name</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, <a class="link" href="glib-Miscellaneous-Utility-Functions.html#g-get-prgname" title="g_get_prgname ()"><code class="function">g_get_prgname()</code></a>
-is called to get the program name (which will work correctly if
-<a href="http://developer.gnome.org/devel/gdk/gdk3-General.html#gdk-init"><code class="function">gdk_init()</code></a> or <a href="http://developer.gnome.org/devel/gtk/gtk3-General.html#gtk-init"><code class="function">gtk_init()</code></a> has been called)</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="g-on-error-stack-trace"></a><h3>g_on_error_stack_trace ()</h3>
-<pre class="programlisting"><span class="returnvalue">void</span> g_on_error_stack_trace (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *prg_name</code></em>);</pre>
-<p>
-Invokes <span class="command"><strong>gdb</strong></span>, which attaches to the current
-process and shows a stack trace. Called by <a class="link" href="glib-Warnings-and-Assertions.html#g-on-error-query" title="g_on_error_query ()"><code class="function">g_on_error_query()</code></a>
-when the [S]tack trace option is selected. You can get the current
-process's "program name" with <a class="link" href="glib-Miscellaneous-Utility-Functions.html#g-get-prgname" title="g_get_prgname ()"><code class="function">g_get_prgname()</code></a>, assuming that you
-have called <a href="http://developer.gnome.org/devel/gtk/gtk3-General.html#gtk-init"><code class="function">gtk_init()</code></a> or <a href="http://developer.gnome.org/devel/gdk/gdk3-General.html#gdk-init"><code class="function">gdk_init()</code></a>.
-</p>
-<p>
-This function may cause different actions on non-UNIX platforms.
-</p>
-<div class="variablelist"><table border="0">
-<col align="left" valign="top">
-<tbody><tr>
-<td><p><span class="term"><em class="parameter"><code>prg_name</code></em> :</span></p></td>
-<td>the program name, needed by <span class="command"><strong>gdb</strong></span>
-for the [S]tack trace option.</td>
-</tr></tbody>
-</table></div>
-</div>
-<hr>
-<div class="refsect2">
-<a name="G-BREAKPOINT:CAPS"></a><h3>G_BREAKPOINT</h3>
-<pre class="programlisting"># define G_BREAKPOINT() G_STMT_START{ __asm__ __volatile__ ("int $03"); }G_STMT_END
-</pre>
-<p>
-Inserts a breakpoint instruction into the code.
-</p>
-<p>
-On x86 and alpha systems this is implemented as a soft interrupt
-and on other architectures it raises a <code class="literal">SIGTRAP</code> signal.
-</p>
-</div>
-</div>
-</div>
-<div class="footer">
-<hr>
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