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123 lines
6.6 KiB
HTML
123 lines
6.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Windows Mobile FAQ</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Installation and Build Guide" />
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<link rel="up" href="build_wince.html" title="Chapter 6. Building Berkeley DB for Windows Mobile" />
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<link rel="prev" href="build_wince_notes.html" title="Windows Mobile notes" />
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<link rel="next" href="build_unix.html" title="Chapter 7. Building Berkeley DB for UNIX/POSIX" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Windows Mobile FAQ</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="build_wince_notes.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 6.
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Building Berkeley DB for Windows Mobile
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="build_unix.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="build_wince_faq"></a>Windows Mobile FAQ</h2>
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</div>
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</div>
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</div>
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<div class="orderedlist">
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<ol type="1">
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<li>
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<span class="bold">
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<strong>What if my Windows Mobile device does not support SetFilePointer and/or SetEndOfFile?</strong>
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</span>
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<p>You can manually disable the truncate functionality from the build.</p>
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<p>Do that by opening the <code class="filename">db-X.X.X/build_wince/db_config.h</code> file, and change the line that reads </p>
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<pre class="programlisting">#define HAVE_FTRUCATE 1</pre>
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<p> to read </p>
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<pre class="programlisting">#undef HAVE_FTRUNCATE</pre>
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<p>Making this change disables <a href="../api_reference/C/dbcompact.html" class="olink">DB->compact()</a> for btree databases.</p>
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</li>
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<li>
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<span class="bold">
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<strong>Why doesn't automatic log archiving work?</strong>
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</span>
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<p>The Windows Mobile platform does not have a concept of a working directory. This means that the <a href="../api_reference/C/logarchive.html#archive_DB_ARCH_REMOVE" class="olink">DB_ARCH_REMOVE</a> and <a href="../api_reference/C/logarchive.html#archive_DB_ARCH_ABS" class="olink">DB_ARCH_ABS</a> flags do not work properly within Windows Mobile, because they rely on having a working directory.</p>
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<p> To work around this issue, you can call log_archive with the <a href="../api_reference/C/logarchive.html#archive_DB_ARCH_LOG" class="olink">DB_ARCH_LOG</a> flag, the list of returned file handles will not contain absolute paths. Your application can take this list of files, construct absolute paths, and delete the files.</p>
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</li>
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<li>
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<span class="bold">
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<strong>Does Berkeley DB support Windows Mobile?</strong>
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</span>
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<p>Yes. </p>
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<p>Berkeley DB relies on a subset of the Windows API, and some standard C library APIs. These are provided by Windows CE. Windows Mobile is built "on top" of Windows CE.</p>
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</li>
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<li>
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<span class="bold">
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<strong>Does Berkeley DB support Windows CE?</strong>
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</span>
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<p>Yes. </p>
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<p>Berkeley DB relies on a subset of the Windows API, and some standard C library APIs. These are provided by Windows CE.</p>
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</li>
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<li>
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<span class="bold">
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<strong>What platforms are the supplied sample applications designed for?</strong>
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</span>
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<p>The supplied sample applications were developed for the Pocket PC 2003 emulator. They are known to work on real pocket PC devices and later versions of the emulator as well.</p>
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<p>The supplied applications are not designed to work with Smartphone devices. The screen size and input mechanisms are not compatible.</p>
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</li>
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<li>
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<span class="bold">
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<strong>I see a file mapping error when opening a Berkeley DB environment or database. What is wrong?</strong>
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</span>
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<p>The default behavior of Berkeley DB is to use memory mapped files in the environment. Windows Mobile does not allow memory mapped files to be created on flash storage.</p>
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<p>There are two workarounds:</p>
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<div class="orderedlist">
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<ol type="a">
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<li>
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Configure the Berkeley DB environment not to use memory mapped files. The options are discussed in detail in
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<a href="../programmer_reference/env_region.html" class="olink">Shared memory region</a>.
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</li>
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<li>Create the Berkeley DB environment on non-flash storage. It is possible to store database and log files in a different location to using the <a href="../api_reference/C/envset_data_dir.html" class="olink">DB_ENV->set_data_dir()</a> and <a href="../api_reference/C/envset_lg_dir.html" class="olink">DB_ENV->set_lg_dir()</a> APIs.</li>
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</ol>
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</div>
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</li>
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</ol>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="build_wince_notes.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="build_wince.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="build_unix.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Windows Mobile notes </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Chapter 7.
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Building Berkeley DB for UNIX/POSIX
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</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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