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+<title>Create and Destroy VFS Filenames</title>
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+<!-- keywords: sqlite3_create_filename sqlite3_free_filename -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Create and Destroy VFS Filenames</h2>
+</div>
+<blockquote><pre>
+sqlite3_filename sqlite3_create_filename(
+  const char *zDatabase,
+  const char *zJournal,
+  const char *zWal,
+  int nParam,
+  const char **azParam
+);
+void sqlite3_free_filename(sqlite3_filename);
+</pre></blockquote>
+<p>
+These interfaces are provided for use by <a href="../vfs.html#shim">VFS shim</a> implementations and
+are not useful outside of that context.</p>
+
+<p>The sqlite3_create_filename(D,J,W,N,P) allocates memory to hold a version of
+database filename D with corresponding journal file J and WAL file W and
+with N URI parameters key/values pairs in the array P.  The result from
+sqlite3_create_filename(D,J,W,N,P) is a pointer to a database filename that
+is safe to pass to routines like:
+<ul>
+<li> <a href="../c3ref/uri_boolean.html">sqlite3_uri_parameter()</a>,
+<li> <a href="../c3ref/uri_boolean.html">sqlite3_uri_boolean()</a>,
+<li> <a href="../c3ref/uri_boolean.html">sqlite3_uri_int64()</a>,
+<li> <a href="../c3ref/uri_boolean.html">sqlite3_uri_key()</a>,
+<li> <a href="../c3ref/filename_database.html">sqlite3_filename_database()</a>,
+<li> <a href="../c3ref/filename_database.html">sqlite3_filename_journal()</a>, or
+<li> <a href="../c3ref/filename_database.html">sqlite3_filename_wal()</a>.
+</ul>
+If a memory allocation error occurs, sqlite3_create_filename() might
+return a NULL pointer.  The memory obtained from sqlite3_create_filename(X)
+must be released by a corresponding call to sqlite3_free_filename(Y).</p>
+
+<p>The P parameter in sqlite3_create_filename(D,J,W,N,P) should be an array
+of 2*N pointers to strings.  Each pair of pointers in this array corresponds
+to a key and value for a query parameter.  The P parameter may be a NULL
+pointer if N is zero.  None of the 2*N pointers in the P array may be
+NULL pointers and key pointers should not be empty strings.
+None of the D, J, or W parameters to sqlite3_create_filename(D,J,W,N,P) may
+be NULL pointers, though they can be empty strings.</p>
+
+<p>The sqlite3_free_filename(Y) routine releases a memory allocation
+previously obtained from sqlite3_create_filename().  Invoking
+sqlite3_free_filename(Y) where Y is a NULL pointer is a harmless no-op.</p>
+
+<p>If the Y parameter to sqlite3_free_filename(Y) is anything other
+than a NULL pointer or a pointer previously acquired from
+sqlite3_create_filename(), then bad things such as heap
+corruption or segfaults may occur. The value Y should not be
+used again after sqlite3_free_filename(Y) has been called.  This means
+that if the <a href="../c3ref/vfs.html#sqlite3vfsxopen">sqlite3_vfs.xOpen()</a> method of a VFS has been called using Y,
+then the corresponding [sqlite3_module.xClose() method should also be
+invoked prior to calling sqlite3_free_filename(Y).
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+