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+<a href="../session/intro.html"><h2>Session Module C Interface</h2></a><h2>Obtain A Composite Changeset From A Changegroup</h2><blockquote><pre>int sqlite3changegroup_output(
+  sqlite3_changegroup*,
+  int *pnData,                    /* OUT: Size of output buffer in bytes */
+  void **ppData                   /* OUT: Pointer to output buffer */
+);
+</pre></blockquote><p>
+Obtain a buffer containing a changeset (or patchset) representing the
+current contents of the changegroup. If the inputs to the changegroup
+were themselves changesets, the output is a changeset. Or, if the
+inputs were patchsets, the output is also a patchset.</p>
+
+<p>As with the output of the sqlite3session_changeset() and
+sqlite3session_patchset() functions, all changes related to a single
+table are grouped together in the output of this function. Tables appear
+in the same order as for the very first changeset added to the changegroup.
+If the second or subsequent changesets added to the changegroup contain
+changes for tables that do not appear in the first changeset, they are
+appended onto the end of the output changeset, again in the order in
+which they are first encountered.</p>
+
+<p>If an error occurs, an SQLite error code is returned and the output
+variables (*pnData) and (*ppData) are set to 0. Otherwise, SQLITE_OK
+is returned and the output variables are set to the size of and a 
+pointer to the output buffer, respectively. In this case it is the
+responsibility of the caller to eventually free the buffer using a
+call to sqlite3_free().
+</p><p>See also lists of
+  <a href="../session/objlist.html">Objects</a>,
+  <a href="../session/constlist.html">Constants</a>, and
+  <a href="../session/funclist.html">Functions</a>.</p>
+