IIS Samples - ISAPI Upcase Filter

UpCase demonstrates a simple ISAPI filter which causes the text passed through it to be changed to upper-case.

Warning   If you install this ISAPI filter on your server, make sure that you have configured IIS to restrict access to the virtual directory that contains the filter and the files you want to transmit. Also, set proper access control on the files in their physical folder. For more information, click Start, Help and Support, and search for Access Control.

Important   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.

 

Sample Overview
Requirements
Location of the Source Code
Build and Install the Sample
Run the Sample
Sample Output
Helpdesk

 

Sample Overview

UpCase works by monitoring requests for .htm files in a directory path that ends with /UC. It then strips the trailing /UC from the directory path and uppercases the body of the HTML text that goes by.

 

Requirements

This sample requires the installation of the following software to function properly:

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Location of the Source Code

IIS samples are included in the IIS Software Developer Kit (SDK). You can download the IIS SDK from Platform SDK Update. You can view the SDK at MSDN Online. In the table of contents at MSDN Online, click Web Development, Server Technologies, Internet Information Services (IIS), SDK Documentation, Internet Information Services, Samples.

The following source code files are required for this sample:

File Description
UpCase.sln UpCase Visual Studio .NET solution file, required to build this sample in Visual Studio .NET.
UpCase.vcproj UpCase Visual Studio .NET C Project file, required to build this sample in Visual Studio .NET.
UpCase.dsp, UpCase.dsw UpCase Visual Studio Version 6 project files, required to build this sample in Visual Studio Version 6.
UpCase.htm UpCase Web page that demonstrates functionality for this filter.
UpCase.c UpCase source module containing the code that implements the filter.
UpCase.def UpCase DLL definition containing code for creating the filter DLL.
MAKEFILE UpCase Makefile for command line compilation

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Build and Install the Sample

To build this sample using the Visual C++ IDE, the following steps must be performed:

  1. Open the solution (VS.NET) or desktop (VS6) file to open the project.
  2. Click Build to create the DLL.

To build and run this sample without using the Visual C++ IDE, the following steps must be performed:

  1. Type NMAKE All from the command line. For example, if your sample files are located in a folder called C:\MySamples, type the following at the command line:
    cd /d c:\MySamples NMAKE All

 

To install this sample, the following steps must be performed:

  1. Copy the UpCase.dll and UpCase.htm files to a physical folder on your computer. For example, create a folder called C:\Samples and copy the files to that folder.
  2. 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 Start, Run, type inetmgr in the text box and click OK. Right-click on the Web site where you want to create a virtual directory, click New, and click Virtual Directory. In the Alias text box, type the name you want for your virtual directory, for example, UpCase. In the Directory text box, type the path to the folder that contains your files.
  3. Install UpCase.dll as a filter on the Web site that contains your new virtual directory. In the IIS Manager, right-click the Web site, click Properties, and click the ISAPI Filters tab. Click Add to open the Filter Properties window. Type UpCase in the Filter Name text box, and type the path to your filter in the Executable text box. Click OK to complete the installation of the filter.
  4. Configure strong security on your new virtual directory. Right-click the virtual directory name, click Properties, and click the Directory Security tab. Press F1 for tips on securing your virtual directory.
  5. Use Windows Explorer to set restricted access control on the sample .dll file in its physical folder. For more information, click Start, Help and Support, and search for Access Control.
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Run the Sample

In order to run this sample, follow the instructions listed below:

  1. Browse to your sample Web files in Internet Explorer (IE). For example, if your files are in a virtual directory called UpCase, type http://localhost/UpCase/UpCase.htm in the Address bar of IE.
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Sample Output

Upon running UpCase, the output from the target web page will have all of its text converted to upper case.

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Help Desk

If here you do not find answers to your questions, visit the Microsoft Help and Support Web site.

Problem Possible Solution
When building the dll, C++ returns a permissions error. 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.
When browsing to the dll, IE gives you a permissions error. The folder and virtual directory must have Execute permissions set on them.

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