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<p>Library Version 18.1.40</p>
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<li>
<span class="bold">
<strong>My Win* C/C++ application crashes in
the Berkeley DB library when Berkeley DB calls fprintf
(or some other standard C library
function).</strong>
</span>
<p>
You should be using the "Debug Multithreaded DLL"
compiler option in your application when you link with
the build_windows\Debug\libdb60d.lib library (this
.lib file is actually a stub for libdb60d.DLL). To
check this setting in Visual C++, choose the
<span class="emphasis"><em>Project/Settings</em></span> menu item
and select <span class="emphasis"><em>Code Generation</em></span> under
the tab marked <span class="emphasis"><em>C/C++</em></span>; and see the
box marked <span class="emphasis"><em>Use runtime library</em></span>.
This should be set to <span class="emphasis"><em>Debug Multithreaded
DLL</em></span>. If your application is linked
against the static library,
build_windows\Debug\libdb60sd.lib; then, you will want
to set <span class="emphasis"><em>Use runtime library</em></span> to
<span class="emphasis"><em>Debug Multithreaded</em></span>.
</p>
<p>
Setting this option incorrectly can cause multiple
versions of the standard libraries to be linked into
your application (one on behalf of your application,
and onle on behalf of the Berkeley DB library). That
violates assumptions made by these libraries, and
traps can result.
</p>
<p>
Also, using different Visual Studio compilers in
the application and libraries can lead to a crash. So
rebuild the application with the same Visual C++
version as that of the library.
</p>
</li>
<li>
<span class="bold">
<strong>Why are the build options for DB_DLL
marked as "Use MFC in a Shared DLL"? Does Berkeley DB
use MFC?</strong>
</span>
<p>
Berkeley DB does not use MFC at all. It does
however, call malloc and free and other facilities
provided by the Microsoft C runtime library. We found
in our work that many applications and libraries are
built assuming MFC, and specifying this for Berkeley
DB solves various interoperation issues, and
guarantees that the right runtime libraries are
selected. Note that because we do not use MFC
facilities, the MFC library DLL is not marked as a
dependency for libdb.dll, but the appropriate
Microsoft C runtime is.
</p>
</li>
<li>
<span class="bold">
<strong>How can I build Berkeley DB for
<a class="ulink" href="http://www.mingw.org" target="_top">MinGW</a>?</strong>
</span>
<p>
Follow the instructions in <a class="xref" href="build_unix.html#build_unix_intro" title="Building for UNIX/POSIX">Building for UNIX/POSIX</a>, and specify
the --enable-mingw option to the configuration script.
This configuration option currently only builds static
versions of the library, it does not yet build a DLL
version of the library, and file sizes are limited to
2GB (2^32 bytes.)
</p>
</li>
<li>
<span class="bold">
<strong>How can I build a Berkeley DB for
Windows 98/ME?</strong>
</span>
<p>
Windows 98/ME is no longer supported by Berkeley
DB. The following is therefore only of interest to
historical users of Berkeley DB.
</p>
<p>
By default on Windows, Berkeley DB supports
internationalized filenames by treating all directory
paths and filenames passed to Berkeley DB methods as
UTF-8 encoded strings. All paths are internally
converted to wide character strings and passed to the
wide character variants of Windows system calls.
</p>
<p>
This allows applications to create and open
databases with names that cannot be represented with
ASCII names while maintaining compatibility with
applications that work purely with ASCII paths.
</p>
<p>
Windows 98 and ME do not support Unicode paths
directly. To build for those versions of Windows,
either:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
Follow the instructions at <a class="ulink" href="http://msdn.microsoft.com/en-us/goglobal/bb688166.aspx" target="_top">
Microsoft's web site</a>.
</p>
</li>
<li>
<p>
Open the workspace or solution file with
Visual Studio. Then open the Project
properties/settings section for the project
you need to build (at least db_dll). In the
<span class="emphasis"><em>C/C++->Preprocessor->Preprocessor
Definitions</em></span> section, remove
<span class="emphasis"><em>_UNICODE</em></span> and
<span class="emphasis"><em>UNICODE</em></span> entries. Add
in an entry of <span class="emphasis"><em>_MBCS</em></span>.
Build the project as normal.
</p>
</li>
</ul>
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<p>
The ASCII builds will also work on newer versions of
Windows, but will not translate paths to wide character
strings.
</p>
</li>
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