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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Running GData Applications: GData Reference Manual</title>
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<h2><span class="refentrytitle"><a name="gdata-overview.top_of_page"></a>Running GData Applications</span></h2>
<p>Running GData Applications — running and debugging GData applications</p>
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<div class="refsect1">
<a name="id-1.2.3.3"></a><h2>Running and Debugging GData Applications</h2>
<div class="refsect2">
<a name="id-1.2.3.3.2"></a><h3>Environment variables</h3>
<p>libgdata makes use of a few environment variables which affect how it runs, mainly with respect to debugging.</p>
<p><a name="LIBGDATA_DEBUG"></a><b><code class="envar">LIBGDATA_DEBUG</code></b>If this environment variable is set to one of the following values, libgdata will give debug output
					(at various levels). If it's unset, no debug output will be produced.
					</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">0</span></p></td>
<td><p>Output no debug messages or network logs.</p></td>
</tr>
<tr>
<td><p><span class="term">1</span></p></td>
<td><p>Output debug messages, but not network logs.</p></td>
</tr>
<tr>
<td><p><span class="term">2</span></p></td>
<td><p>Output debug messages and network traffic headers.</p></td>
</tr>
<tr>
<td><p><span class="term">3</span></p></td>
<td><p>Output debug messages and full network traffic logs.</p></td>
</tr>
</tbody>
</table></div>
<p>
				So, to debug a program which uses libgdata, run it from a terminal with the following command:</p>
<pre class="screen"><code class="prompt">$</code><strong class="userinput"><code>LIBGDATA_DEBUG=3 ./my-program-name &amp;&gt; libgdata.log</code></strong></pre>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.3.3.3"></a><h3>Debugging Advice</h3>
<p>The easiest way to debug problems with libgdata is to use the
			      <a class="link" href="gdata-running.html#LIBGDATA_DEBUG" title="LIBGDATA_DEBUG"><code class="envar">LIBGDATA_DEBUG</code></a> environment variable to observe all the network
			      traffic being transmitted and received by libgdata. Typically, any problems will occur in the final network
			      request/response, which is the last one in the log output.</p>
<p>If debugging using the environment variables and log output is not possible, it is sometimes possible to diagnose problems
			      by examining the error responses sent by the Google servers to libgdata. These are exposed as the error messages returned
			      by libgdata methods; so when handling errors from libgdata method calls, it is a good idea to output the message from
			      the <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> to a debug log, or even as a warning in the user's
			      <code class="filename">.xsession-errors</code> file.</p>
<div class="example">
<a name="id-1.2.3.3.3.4"></a><p class="title"><b>Example 1. Error Handling when Uploading a Document</b></p>
<div class="example-contents">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
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17</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="usertype">GDataUploadStream</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">upload_stream</span><span class="symbol">;</span>
<span class="usertype">GError</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">error </span><span class="symbol">=</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span><span class="normal"> </span><span class="comment">/* make sure to initialise the GError to NULL */</span>

<span class="comment">/* Other code goes here. */</span>

<span class="normal">upload_stream </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GDataDocumentsService.html#gdata-documents-service-upload-document">gdata_documents_service_upload_document</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">service</span><span class="symbol">,</span><span class="normal"> document</span><span class="symbol">,</span><span class="normal"> slug</span><span class="symbol">,</span><span class="normal"> content_type</span><span class="symbol">,</span><span class="normal"> destination_folder</span><span class="symbol">,</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span>
<span class="normal">                                                         </span><span class="symbol">&amp;</span><span class="normal">error</span><span class="symbol">);</span>

<span class="comment">/* Handle any errors. */</span>
<span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">error </span><span class="symbol">!=</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">    </span><span class="comment">/* Note that the error message is outputted to the terminal/logs.</span>
<span class="comment">     * It will contain important debugging information from the Google servers. */</span>
<span class="normal">    </span><span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Message-Logging.html#g-error">g_error</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Error getting upload stream: %s"</span><span class="symbol">,</span><span class="normal"> error</span><span class="symbol">-&gt;</span><span class="normal">message</span><span class="symbol">);</span>
<span class="normal">    </span><span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#g-error-free">g_error_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">error</span><span class="symbol">);</span>

<span class="normal">    </span><span class="keyword">return</span><span class="symbol">;</span>
<span class="cbracket">}</span></pre></td>
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