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<title>IIS Samples - ISAPI DumpVars</title>
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<p>
<h2>IIS Samples - ISAPI DumpVars</h2>
<a name="IIS_DumpVars"></a>
<p>This sample demonstrates how to access IIS server variables from an ISAPI extension. Server
variables provide such information as header values, the application's physical path, authentication
information, client information, and so on.</p>
<p><font color="red"><b>Warning</b></font> &nbsp; Header values should never be used to
make important decisions in your code because header values can be fabricated by a malicious user.</p>
<p><font color="blue"><b>Important</b></font> &nbsp; These samples are provided for educational purposes only. They are not
intended to be used in a production environment, have not been tested in a production
environment, and Microsoft does not provide technical support for them.
<p>
&nbsp;</p>
<p>
<a href="#ovr">Sample Overview</a><br>
<a href="#req">Requirements</a><br>
<a href="#loc">Location of the Source Code</a><br>
<a href="#bld">Build and Install the Sample</a><br>
<a href="#run">Run the Sample</a><br>
<a href="#out">Sample Output</a><br>
<a href="#hlp">Helpdesk</a></p>
<p>
&nbsp;</p>
<h4><a name="ovr"></a>Sample Overview</h4>
<p>DumpVars.dll uses the ISAPI extension <b>GetServerVariable</b> callback
function to display a list of a few select IIS server variables (supported on IIS versions 4.0 through
6.0). A complete list of server variables can be found in the IIS Software Developer Kit (SDK) under
<b>Server Variables</b>.</p>
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<p>&nbsp;</p>
<h4><a name="req"></a>Requirements</h4>
<p>This sample requires the installation of the following software to
function properly:</p>
<ul>
<li>Windows XP Professional with IIS 5.1 installed or Windows XP Server with
IIS 6.0 installed.</li>
</ul>
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<p>&nbsp;</p>
<h4><a name="loc"></a>Location of the Source Code</h4>
<p>IIS samples are included in the IIS Software Developer Kit (SDK).
You can download the IIS SDK from
<a href="http://go.microsoft.com/fwlink/?LinkId=7298">Platform SDK Update</a>.
You can view the SDK at <a href="http://go.microsoft.com/fwlink/?LinkId=1694">MSDN Online</a>.
In the table of contents at MSDN Online, click <b>Web Development</b>, <b>Server Technologies</b>,
<b>Internet Information Services (IIS)</b>, <b>SDK Documentation</b>,
<b>Internet Information Services</b>, <b>Samples</b>.</p>
<p>The following source code files are required for this sample:</p>
<table border="1">
<tr>
<th>File</th>
<th>Description</th>
</tr>
<tr>
<td>DumpVars.sln</td>
<td>DumpVars Visual Studio .NET solution file, required to build this sample in Visual Studio .NET.</td>
</tr>
<tr>
<td>DumpVars.vcproj</td>
<td>DumpVars Visual Studio .NET C Project file, required to build this sample in Visual Studio .NET.</td>
</tr>
<tr>
<td>DumpVars.dsp, DumpVars.dsw</td>
<td>DumpVars Visual Studio 6.0 project files, required to build this sample in Visual Studio Version 6.</td>
</tr>
<tr>
<td>DumpVars.cpp</td>
<td>DumpVars source module containing the code that implements the sample.</td>
</tr>
<tr>
<td>DumpVars.def</td>
<td>DumpVars.dll definition containing code for creating the sample.</td>
</tr>
<tr>
<td>MAKEFILE</td>
<td>DumpVars makefile for command line compilation</td>
</tr>
</table><br>
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<p>&nbsp;</p>
<h4><a name="bld"></a>Build and Install the Sample</h4>
<p>To build this sample using the Visual C++ IDE, the following
steps must be performed:</p>
<ol>
<li>Open the solution (VS.NET) or desktop (VS6) file to open the project.</li>
<li>Click <b>Build</b> to create the DLL.</li>
</ol>
<p>To build and run this sample without using the Visual C++ IDE, the
following steps must be performed:</p>
<ol>
<li>Type <b>NMAKE All</b> from the command line. For example, if your sample files are located in
a folder called <code>C:\MySamples</code>, type the following at the command line:
<pre>cd /d c:\MySamples
NMAKE All</pre>
</li>
</ol>
<p>&nbsp;</p>
<p>To install this sample, the following steps must be performed:</p>
<ol>
<li>Copy the DumpVars.dll to a physical folder on your computer. For example,
create a folder called <code>C:\Samples</code> and copy the DumpVars.dll to that folder.</li>
<li>Create a virtual directory that maps to the physical folder containing your files. To create a virtual directory, open the Internet Information Services (IIS) Manager by clicking <b>Start</b>, <b>Run</b>, type <code>inetmgr</code> in the text box and click <b>OK</b>. Right-click on the Web site where you want to create a virtual directory, click <b>New</b>, and click <b>Virtual Directory</b>. In the <b>Alias</b> text box, type the name you want for your virtual directory, for example, <code>DumpVars</code>. In the <b>Directory</b> text box, type the path to the folder that contains your files.
<li>Configure strong security on your new virtual directory. Right-click the virtual directory name, click <b>Properties</b>, and click the <b>Directory Security</b> tab. Press F1 for tips on securing your virtual directory.</li>
<li>Use Windows Explorer to set restricted access control on the sample .dll file in its physical folder. For more information, click <b>Start</b>, <b>Help and Support</b>, and search for <b>Access Control</b>.</li>
</ol>
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<p>&nbsp;</p>
<h4><a name="run"></a>Run the Sample</h4>
<p>In order to run this sample, follow the instructions listed below:</p>
<ol>
<li>Browse to your sample Web files in Internet Explorer (IE). For example, if your files are in a
virtual directory called <code>DumpVars</code>, type
<code>http://localhost/DumpVars/DumpVars.dll</code> in the <b>Address</b> bar
of IE.
</li>
</ol>
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<p>&nbsp;</p>
<h4><a name="out"></a>Sample Output</h4>
<p>After performing step 1 from <b>Run the Sample</b>, you should see a list of server variables
starting with the following output.</p>
<pre> Server Variable Dump
--------------------------------------------------------------------------------
APPL_MD_PATH: /LM/W3SVC/1/ROOT
APPL_PHYSICAL_PATH: d:\inetpub\wwwroot\
AUTH_PASSWORD:
AUTH_TYPE:
</pre>
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<p>&nbsp;</p>
<h4><a name="hlp"></a>Help Desk</h4>
<p>If here you do not find answers to your questions, visit the
<a href="http://go.microsoft.com/fwlink/?linkid=1782">Microsoft Help and Support</a>
Web site.</p>
<table border="1">
<tr>
<th>Problem</th>
<th>Possible Solution</th>
</tr>
<tr>
<td>When building the dll, C++ returns a permissions error.</td>
<td>Once you have called the dll from your web page, your system considers
it a loaded dll. You must unload it to build it again, either by
unloading the ASP application or deleting the dll from system32\dllcache.</td>
</tr>
<tr>
<td>When browsing to the dll, IE gives you a permissions error.</td>
<td>The folder and virtual directory must have Execute permissions set on them.</td>
</tr>
</table><br>
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<hr class="iis" size="1">
<p align="center"><i><EFBFBD> 1997-2002 Microsoft Corporation. All rights reserved.</i></p>
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