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Developers can use Automation in Microsoft Office to build custom solutions that use the capabilities and the features that are built into the Office product. Although such programmatic development can be implemented on a client system with relative ease, a number of complications can occur if Automation takes place from server-side code such as Microsoft Active Server Pages ASP , ASP.

This article discusses the complications that developers may face. The article also offers alternatives to Automation that can speed performance. Developers should be aware, however, that the suggestions that this article provides are for informational purposes only. Microsoft does not recommend or support server-side Automation of Office. The term “server-side” also applies to code that is running on a Windows workstation, if the code is running from a Windows workstation other than the interactive station of the user who is logged on.

Therefore, many of the issues that this article describes may occur. All current versions of Microsoft Office were designed, tested, and configured to run as end-user products on a client workstation. They assume an interactive desktop and user profile. They do not provide the level of reentrancy or security that is necessary to meet the needs of server-side components that are designed to run unattended. Microsoft does not currently recommend, and does not support, Automation of Microsoft Office applications from any unattended, non-interactive client application or component including ASP, ASP.

If you are building a solution that runs in a server-side context, you should try to use components that have been made safe for unattended execution. Or, you should try to find alternatives that allow at least part of the code to run client-side. If you use an Office application from a server-side solution, the application will lack many of the necessary capabilities to run successfully. Additionally, you will be taking risks with the stability of your overall solution.

Developers who try to use Office in a server-side solution need to be aware of five major areas in which Office behaves differently than anticipated because of the environment. If your code is to run successfully, you must address these issues and minimize their effects as much as possible.

Consider these issues carefully when you build your application. One solution cannot address all the issues. Different designs require you to prioritize the elements differently. User Identity: Office applications assume a user identity when the applications are run, even when Automation starts the applications. The applications try to initialize toolbars, menus, options, printers, and some add-ins based on settings in the user registry hive for the user who launches the application.

Therefore, Office may not initialize correctly on startup. Even if the Office application can be started, other functions may not work correctly if no user profile exists.

Interactivity with the desktop: Office applications assume that they are being run under an interactive desktop. In some circumstances, applications may need to be made visible for certain Automation functions to work correctly. If an unexpected error occurs, or if an unspecified parameter is needed to complete a function, Office is designed to prompt the user with a modal dialog box that asks the user what the user wants to do. A modal dialog box on a non-interactive desktop cannot be dismissed.

Therefore, that thread stops responding hangs indefinitely. Although certain coding practices can help reduce the likelihood of this issue, these practices cannot prevent the issue entirely. This fact alone makes running Office Applications from a server-side environment risky and unsupported. Reentrancy and scalability: Server-side components need to be highly reentrant, multi-threaded COM components that have minimum overhead and high throughput for multiple clients.

Office applications are in almost all respects the exact opposite. Office applications are non-reentrant, STA-based Automation servers that are designed to provide diverse but resource-intensive functionality for a single client. The applications offer little scalability as a server-side solution. Additionally, the applications have fixed limits to important elements, such as memory.

These cannot be changed through configuration. More importantly, the applications use global resources such as memory mapped files, global add-ins or templates, and shared Automation servers. This can limit the number of instances that can run concurrently and can lead to race conditions if the applications are configured in a multi-client environment.

Developers who plan to run more than one instance of any Office application at the same time need to consider “pooling” or serializing access to the Office application to avoid potential deadlocks or data corruption. MSI introduces the concept of “install on first use. In a server-side environment, this both slows down performance and increases the likelihood that a dialog box may appear that asks the user to approve the installation or to provide an installation disk.

Although this is designed to increase the resiliency of Office as an end-user product, Office’s implementation of MSI capabilities is counterproductive in a server-side environment.

Furthermore, the stability of Office in general cannot be assured when Office is run server-side because it has not been designed or tested for this type of use.

Using Office as a service component on a network server may reduce the stability of that computer, and therefore may reduce the stability of your whole network. Server-side security: Office applications were never intended for server-side use. Therefore, Office applications do not take into consideration the security problems that distributed components face. Office does not authenticate incoming requests.

Office also does not protect you from unintentionally running macros, or from starting another server that might run macros, from your server-side code. Do not open files that are uploaded to the server from an anonymous Web site. Based on the security settings that were last set, the server can run macros under an Administrator or System context with full privileges and can therefore compromise your network. If Office is being automated server-side, one instance may service more than one client.

If authentication information has been cached for that session, one client can use the cached credentials of another client. Therefore, the client may gain non-granted access permissions by impersonating other users.

Besides the technical problems, you must also consider licensing issues. Current licensing guidelines prevent Office applications from being used on a server to service client requests, unless those clients themselves have licensed copies of Office. In addition to these issues, one of the following common errors may occur when you try to automate Office server-side:. The CreateObject function and the CoCreateInstance function return one of the following run-time error messages and cannot be started for Automation.

The CreateObject function and the CoCreateInstance function stop responding and never finish, or take a long time to return. On some servers, the creation is fast, but errors appear in the Windows event log that indicate that the application was stopped.

Certain functions fail unexpectedly or stop responding indefinitely because of a user alert or other dialog box that requires user attention. Running multiple requests or stress testing causes the code to fail, stop responding, or crash on creation or termination of an Office application. When this occurs, either the process is left running in memory and cannot be terminated, or all instances of the application that is being automated fail from that point on.

Other problems or messages may appear in addition to those listed here, but these problems typically occur as a result of the five main issues that are listed earlier in this article.

Microsoft strongly recommends that developers find alternatives to Automation of Office if they need to develop server-side solutions. Because of the limitations to Office’s design, changes to Office configuration are not enough to resolve all issues.

Microsoft strongly recommends a number of alternatives that do not require Office to be installed server-side, and that can perform most common tasks more efficiently and more quickly than Automation. Before you involve Office as a server-side component in your project, consider alternatives. Most server-side Automation tasks involve document creation or editing.

Office supports new Open XML file formats that let developers create, edit, read, and transform file content on the server side.

These file formats use the System. IO namespace in the Microsoft. NET 3. This is the recommended and supported method for handling changes to Office files from a service. The Open XML file formats are a public standard. You can then stream these files to a client by using a MIME type so that the resulting text appears in Office.

The document can be edited, saved, and even returned to the server by using ASP on the server. For more information about any of these topics, and for examples that show how to implement them, click the following article numbers to view the articles in the Microsoft Knowledge Base:.

If your business requires the server-side creation of the Office 97, Office , Office XP, and Office binary file formats, third-party vendors offer components that can help you.

Microsoft does not provide any such components, so you will need to either build a solution yourself or purchase one from a third-party vendor. Many different third-party products are available. You should investigate each solution to best match the vendor to your business needs. If you want to build your own solution that edits the Office 97, Office , Office XP, and Office binary file formats directly, you can obtain the file format specifications for free under the terms of the Microsoft Open Specification Promise OSP.

No technical support is available for the documentation or for the products that you create, but documentation is available. Server-side solutions also may want to allow users to upload files, and then have the server render the files for viewing on the Web or on other mediums. Microsoft is currently working to offer such features, and provides an early version of this capability in Microsoft Excel Services.

Excel Services is a new server technology that is included in Microsoft Office SharePoint Server and that enables you to load, calculate, and display Excel workbooks on Office SharePoint Server Excel Services Overview.

Word Automation Services provides unattended, server-side conversion of documents into formats that are supported by the Microsoft Word client application. Word Automation Services Overview. Introducing Word Automation Services You need to evaluate which of the options that this article describes suits your needs, and how best to deploy your solution.

The information that this article provides is not guaranteed to resolve all issues for all clients. You are encouraged to test your solution thoroughly before you deploy the solution. Run-time error ”: ActiveX component cannot create object. Run-time error ” 0xAD : Could not open macro storage. Need more help? Expand your skills. Get new features first.

 
 

 

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