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Requirements for Installing Visual FoxPro


Visual FoxPro has the following minimum system requirements:

Computer: An IBM-compatible computer with a Pentium class processor

Peripherals: Mouse or pointing device

Memory: 64 MB RAM (128 MB or higher recommended)

Hard disk space:
¡@Visual FoxPro Prerequisites: 20 MB
¡@Visual FoxPro Typical Install: 165 MB
¡@Visual FoxPro Maximum Install: 165 MB

Video: 800 x 600 resolution, 256 colors (High color 16-bit recommended)

Operating system: Developing applications with Visual FoxPro is supported only on Microsoft Windows 2000 Service Pack 3 or later, and Windows XP. You can create and distribute run-time applications for Windows 98, Windows Me, Windows 2000 Service Pack 3 or later, and Windows XP.

Note:
Installation on Windows NT 4.0 Terminal Server Edition is not supported.



See Also

How to: Install Visual FoxPro

Installing Visual FoxPro

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How to: Install Visual FoxPro


You can install this version of Visual FoxPro from a CD-ROM or a network to a local hard drive. You must install Visual FoxPro on a local drive, not a mapped drive. There is no other preparation required before installing Visual FoxPro. You must have administrator privileges to install Visual FoxPro. It is recommended that you run with power-user privileges to use all the provided tools effectively.

You can safely install or uninstall using Visual FoxPro Setup. If you are upgrading Visual FoxPro, you must first uninstall the previous version of of the program. Though both versions of Visual FoxPro can exist on the same computer, you cannot install the current version of Visual FoxPro in the same directory as the previous version.

If you plan to publish XML Web services using Visual FoxPro, you might want to set up Internet Information Services (IIS) on a Windows 2000 or Windows XP computer. Refer to your operating system documentation for instructions on how to set up and configure IIS.

Note:
Visual FoxPro setup no longer installs any Windows operating system Service Packs or versions of Internet Explorer. It is highly recommended that you install the latest versions of these components before installing Visual FoxPro. Additionally, Visual FoxPro 9.0 is supported only on Windows 2000 Service Pack 3 or later. For details about installing the latest Service Pack, visit the following Microsoft Web page at http://www.microsoft.com/windows2000/.


Full installation includes all Visual FoxPro program files, online help, and samples files.



To install Visual FoxPro

01.Quit all open applications.

Note:
If you use a virus protection program on your computer, override it or turn it off before running the Installation wizard. The Installation wizard might not run properly with virus protection turned on. After installation, be sure to restart your virus protection program.


02.Insert the Visual FoxPro CD.
¡@ The Visual FoxPro Setup start page appears automatically.

03.Click Install Visual FoxPro to launch Visual FoxPro Setup.

04.To determine if you need additional components, click Prerequisites to display any necessary components.

05.Click Install Now! to install any new components. If Visual FoxPro Prerequisites needs to only update components, click Update Now!

06.You might need to restart your computer. When finished, click Done.
¡@ Visual FoxPro Setup reappears.

07.To continue installation, click Visual FoxPro.

08.After accepting the End User License Agreement and entering the Product Key and your name, click Continue.

Note:
Visual FoxPro cannot be installed on a mapped drive. You must install Visual FoxPro on a local drive. Do not attempt to use the Map Network Drive functionality in Setup.

09.On the Options page, select the features you want to install and click Install Now! to continue.

10.When finished, click Done to return to Visual FoxPro Setup. Click Exit to return to the Visual FoxPro Setup start page.



If you uninstall Visual FoxPro while the previous version of Visual FoxPro exists on your computer, certain shared registry keys used by the previous version of Visual FoxPro are removed. You must reinstall these critical shared registry keys.

If you run Visual FoxPro from the Start menu, Visual FoxPro Setup automatically reinstalls these keys. If you start Visual FoxPro using other means, such as running the application executable directly, the setup program does not start automatically. You should use Add/Remove Programs in the Control Panel and the following steps to reinstall the registry keys manually:


To manually reinstall Visual FoxPro 9.0 registry keys

1.From the Start menu, click Control Panel.

2.Click Add/Remove Programs.

3.Click Change/Remove for Microsoft Visual FoxPro 9.0.

4.Click Visual FoxPro and Repair/Reinstall.



See Also

Requirements for Installing Visual FoxPro

How to: Install Additional Applications

How to: Reinstall Visual FoxPro

Troubleshooting Installation

Installing Visual FoxPro

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How to: Install Additional Applications


This release includes copies of additional software that you can install and use with Visual FoxPro. These include:

¡@InstallShield Express Limited Edition
Provides the capability to package and deploy the applications that you create using Visual FoxPro. Visual FoxPro includes the updated and limited edition of InstallShield Express 3.54.

Note:
The limited and full editions of InstallShield Express 3.54 are considered two versions of the same product and cannot coexist. If you install one version on a computer where another already exists, the original is uninstalled automatically. Because the limited edition contains fewer features than the full edition, you should keep the full edition on your computer.

¡@Microsoft SOAP Toolkit 3.0 Samples
Provides samples for demonstrating how to consume and publish XML Web services. Visual FoxPro Prerequisites installs the core SOAP Toolkit 3.0 components needed to access and publish XML Web services in Visual FoxPro.

¡@Microsoft SQL Server 2000 Desktop Engine (MSDE)
Provides a personal version of SQL Server.



To install InstallShield Express Limited Edition

1.Insert the Visual FoxPro CD.
¡@The Visual FoxPro Setup start page opens automatically.

2.Click Install InstallShield Express.

3.Follow the instructions in the InstallShield Express installation wizard.



You can also locate the Setup.exe file for InstallShield Express in the InstallShield folder on the Visual FoxPro CD.

Note:
Visual FoxPro 9.0 installs its redistributable merge modules in a location different from Visual FoxPro 8.0.


The following are the locations of the redistributable merge modules for Visual FoxPro 8.0 and 9.0:

Visual FoxPro 8.0: \Program Files\Common Files\Microsoft Shared\Merge Modules\

Visual FoxPro 9.0: \Program Files\Common Files\Merge Modules\

The version of InstallShield Express included with Visual FoxPro 8.0 automatically uses the new Visual FoxPro 8.0 merge module location.

Note:
Visual FoxPro 9.0 requires certain merge modules when creating a Visual FoxPro 9.0 redistributable custom application setup program using InstallShield Express.


You need to include the following merge modules when creating your custom setup program:

Microsoft Visual FoxPro 9 Runtime Libraries
Microsoft Visual C++ Runtime Library 7.0
GDI Plus Redist
XML 4.0



To install SOAP Toolkit 3.0 Samples

1.Insert the Visual FoxPro CD.
¡@The Visual FoxPro Setup start page opens automatically.

2.Click Install SOAP Toolkit 3.0 Samples.

3.Follow the instructions in the SOAP Toolkit 3.0 Samples Setup Wizard..

You can also locate the Soapsdk.msi and Soapsamp.msi files for the SOAP Toolkit in the SOAPToolkit folder on the Visual FoxPro CD.



To install MSDE

1.Insert the Visual FoxPro CD.
¡@The Visual FoxPro Setup start page opens automatically.

2.Click Install Microsoft SQL Server Desktop Engine (MSDE) to install MSDE without an installation wizard. Click Yes to verify that you want to install MSDE.

You can also locate the Setup.exe file for MSDE in the SQLMSDE folder on the Visual FoxPro CD.

Note:
Visual FoxPro includes Microsoft SQL Server 2000 Desktop Engine Service Pack 2.0. To make sure you have the most recent version and Service Pack installed, visit the Microsoft SQL Server Web page at http://www.microsoft.com/sql/default.asp. In addition, if you are distributing custom Visual FoxPro applications that require MSDE, you can obtain the redistributable merge modules from the Microsoft SQL Server Web page for use with Windows Installer-based setup programs.



See Also

How to: Install Visual FoxPro

Installing Visual FoxPro

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How to: Reinstall Visual FoxPro


You can reinstall Visual FoxPro by uninstalling it and then installing it again. You can uninstall Visual FoxPro from the Start menu or from the original installation disk.



To uninstall Visual FoxPro

1.On the Start menu, click Control Panel.

2.In the Control Panel window, double-click Add or Remove Programs.
¡@The Add or Remove Programs window opens.

3.In the Currently installed programs list, click the version of Microsoft Visual FoxPro you want to uninstall, and then Change/Remove.


If you reinstall Visual FoxPro or reinstall to another location, you might want to clean your user settings and other files installed by Visual FoxPro before reinstalling.

You can remove these files by deleting the contents of the ...\Application Data\Microsoft\Visual FoxPro folder inside your user settings folder. To determine the location of the Application Data folder, type ? HOME(7) in the Command window. These files include your FoxUser.* resource files, which contain user settings, and folders for the Toolbox and Task Pane.

However, it is possible that your resource files are in another location. You can determine their location by typing the following in the Command window:

? SYS(2005)


You should delete old Code Reference files that might be associated with projects in the project directories. These are labeled as projectname_ref.* files. You might also need to restore the default Visual FoxPro registry settings.

Visual FoxPro includes the VFPClean.app tool so you can make sure all core Xbase and other files are set appropriately.



To run VFPClean.app

Type the following line of code in the Command window:

DO HOME()+"VFPCLEAN.APP"



See Also

How to: Install Visual FoxPro

Installing Visual FoxPro

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Troubleshooting Installation


You might encounter the following issues when installing Visual FoxPro:


If you cannot run Visual FoxPro and do not see error messages telling you what is wrong, the problem might be in your computer's ROM BIOS or the video driver you are using.

If you are using an extended keyboard, be sure it is compatible with the ROM BIOS. In addition, make sure that you are using a standard VGA or Super VGA Windows video driver.

If you get a "stack overflow" error message, your video driver is out of date or not designed for your video card. To correct this problem, update the video driver.

For additional information, see the Visual FoxPro Readme at the root of the Visual FoxPro installation CD.



See Also

Installing Visual FoxPro

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Upgrading from Earlier Versions


Microsoft Visual FoxPro protects your investment in applications built with previous versions of FoxPro. In Visual FoxPro, you can run many applications that were written in earlier versions with little or no conversion. You can modify and enhance applications using the Visual FoxPro language, knowing that most extensions to the language do not affect backward compatibility. In addition, you can convert FoxPro screens, projects, and reports to Visual FoxPro format.

However, it is possible that some behavior or feature changes in the current version of Visual FoxPro might affect existing Visual FoxPro source code. Therefore, you should review the new features, enhancements, and most recent behavior changes for this version. For more information, see What's New in Visual FoxPro and Changes in Functionality for the Current Release.



Conversion to Visual FoxPro Format

If you choose to convert your dBASE or FoxPro files to the Visual FoxPro format, you can take advantage of the unique features of Visual FoxPro. You can run many files from some previous versions of FoxPro directly; others require varying levels of conversion.

You can convert most projects or components created using previous versions of Visual FoxPro simply by opening or recompiling them in this version of Visual FoxPro. When you recompile components, such as forms, screens, or reports, some modifications may be necessary. You can make modifications to these components in the same way you modify the components of this version of Visual FoxPro.

You can find additional information about upgrading from previous versions of Visual FoxPro on the Microsoft Developer Network (MSDN) Web site at http://msdn.microsoft.com. You can search the MSDN Archive for documentation of previous versions of Visual FoxPro.



See Also

Getting Started with Visual FoxPro

Overview of Visual FoxPro Features

Installing Visual FoxPro

Customizing the Visual FoxPro Environment

Optimizing Your System

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How to: Convert Earlier Visual FoxPro Files


You can explicitly convert FoxPro 2.6 and Visual FoxPro 3.0 files to the current Visual FoxPro format, which is necessary when you want to use these files with later versions of Visual FoxPro. Files that are created from later versions are converted automatically.



To convert FoxPro 2.6 and Visual FoxPro 3.0 files

1.On the File menu, click Open.

2.In the Open dialog box, browse for and select the file.
¡@The Visual FoxPro Converter dialog box opens. For more information, see Visual FoxPro Converter Dialog Box.

3.In the Visual FoxPro Converter dialog box, select the options you want.

4.To complete the file conversion, click Continue.

Note:
If you are converting Macintosh or MS-DOS files that have never contained Windows records, the Visual FoxPro Transporter dialog box appears. For more information, see Visual FoxPro Transporter Dialog Box.


You can also convert FoxPro 2.6 and Visual FoxPro 3.0 files by typing one of the following commands with the file name in the Command window:

MODIFY PROJECT Command

MODIFY FORM Command

MODIFY REPORT Command

MODIFY LABEL Command



See Also

Getting Started with Visual FoxPro

Upgrading from Earlier Versions

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Customizing the Visual FoxPro Environment


After you install Visual FoxPro, you might want to customize your development environment. You can also specify configuration settings that load when you start Visual FoxPro.

For information on optimizing your Visual FoxPro applications, see Optimizing Applications.



In This Section


Optimizing Your System

Explains how to get maximum performance by optimizing your operating system, Visual FoxPro, and your application.


Visual FoxPro Configuration

Explains how changing the configuration of your copy of Visual FoxPro affects the way it looks and behaves, such as establishing default locations for files used with Visual FoxPro, altering how your source code looks in an edit window, and displaying the format of dates and times.


Visual FoxPro Environment Settings

Describes different ways to change Visual FoxPro environment settings such as using the Options dialog box, setting configuration options at program startup, and using command-line options. You can configure Visual FoxPro toolbars, dock windows, set editor options, and customize the appearance of your applications without altering code.


Restoring the Visual FoxPro Interactive Environment

Describes how to close down all program operations and clear the Visual FoxPro desktop to return to its interactive state.


Accessibility for People with Disabilities (Visual FoxPro)

Provides information about features, products, and services that make Microsoft Visual FoxPro and the Windows operating system more accessible for people with disabilities.



Related Sections


Getting Started with Visual FoxPro

Provides information about installing, upgrading, and customizing Visual FoxPro.


Using Visual FoxPro

Explains how Visual FoxPro provides the tools you need to create and to manage high-performance database applications and components.


Samples and Walkthroughs

Describes how to create different types of applications and components with step-by-step guides.


Overview of Visual FoxPro Features

Describes how Visual FoxPro gives you more of everything you have come to expect in a database management system (DBMS) ¡X speed, power, and flexibility.


Developing Visual FoxPro Applications

Includes conceptual information about how to develop Visual FoxPro applications, instructions for creating databases and the user interface, and other tasks needed to create Visual FoxPro applications.


Programming in Visual FoxPro

Describes how understanding object-oriented programming techniques and the event-driven model can maximize your programming productivity and enable you to access the full power of Visual FoxPro.


Development Productivity Tools

Explains that Visual FoxPro provides developer tools for application development within the FoxPro application and the FoxPro language.

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Optimizing Your System


Visual FoxPro is designed to be a fast relational database development system. However, applications you create with Visual FoxPro can have varying requirements and purposes. Therefore, you might want to optimize the operating system, Visual FoxPro, or your application for maximum performance.



In This Section


Optimizing the Operating Environment

Describes how to optimize computer hardware and and operating environment for running Visual FoxPro.


Optimizing Visual FoxPro Startup Speed

Describes how to optimize startup and operating speed in Visual FoxPro.


Optimizing Visual FoxPro in a Multiuser Environment

Describes how to improve performance when running Visual FoxPro in a multiuser environment.



Related Sections


Customizing the Visual FoxPro Environment

Provides information about setting environment options, accessibility features, and configuration.


Getting Started with Visual FoxPro

Discusses how to get started, including information about installing, upgrading, and customizing Visual FoxPro to create state-of-the-art enterprise database solutions.


What's New in Visual FoxPro

Lists the new features and enhancements made to this version of Microsoft Visual FoxPro.


Using Visual FoxPro

Provides links to information on Visual FoxPro programming features that are designed to improve developer productivity, including Access and Assign methods, support for more graphic file formats, and language to simplify programming tasks.


Developing Visual FoxPro Applications

Includes conceptual information about how to develop Visual FoxPro applications, instructions for creating databases and the user interface, and other tasks needed to create Visual FoxPro applications.


Programming in Visual FoxPro

Discusses how to access the full power of Visual FoxPro by creating applications. Understanding object-oriented programming techniques and the event-driven model can maximize your programming productivity.

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Optimizing the Operating Environment


You can optimize Visual FoxPro performance by maximizing your computer's hardware and operating environment. The following sections describe how you can optimize these areas:

Maximizing Memory and Virtual Memory

Managing Your Hard Disk



Maximizing Memory and Virtual Memory

Providing your computer with as much memory as possible is the most effective way to optimize your system for Visual FoxPro. You can also use memory more effectively by closing all other running applications on your computer. To maximize the use of your computer's memory while running Visual FoxPro, follow these guidelines:

Do not run other Windows applications while running Visual FoxPro.

Use only those memory-resident programs needed for operation.

Simplify the screen display.


You can free memory by simplifying the way windows and screen backgrounds display on your computer monitor.

Use a color or a pattern for the desktop background instead of wallpaper.

Use the lowest-resolution display that is practical for you. The higher resolution of the display, the more memory your computer requires and the slower your graphics and user-interface elements appear. For VGA-compatible displays that use an extended mode driver, such as Video 7 or 8514, using the standard VGA driver ensures faster display performance but provides lower resolution and less color support.


To increase the number of applications that you can run simultaneously, Microsoft Windows supports virtual memory by swapping segments of code that is the least recently used from memory to the hard disk in the form of a paging file. As a rule, the default settings in the Windows operating system for managing virtual memory meet the requirements of most users and are the recommended settings.

Note:
The paging file does not improve Visual FoxPro performance and is not a substitute for more memory.



Managing Your Hard Disk

Managing your hard disk can improve overall product speed. To get the best performance from your hard disk, provide a generous amount of disk space. If your hard disk has little free space, you can increase Visual FoxPro performance by removing unnecessary data or by purchasing a hard disk with greater capacity.

Disk input/output performance degrades significantly when a hard disk is nearly full. The more free hard disk space that is available, the more likely it is that contiguous blocks of disk space are available. Visual FoxPro uses this space for changes and additions to database, table, index, memo, and temporary files. Increasing free hard disk space improves performance of any commands that change or add to your files. More disk space also decreases the time required to read those files in response to your queries.

The way that Windows and Visual FoxPro manage files on disk can greatly affect the performance of your application. The following sections discuss managing files in directories and temporary files:

Managing Files in Directories

Managing Temporary Files


Managing Files in Directories

As a directory becomes increasingly congested with files, the operating system takes longer to find files. The speed of your system when searching directories is a factor that Visual FoxPro does not control. To improve the speed of directory searches, reduce the number of files in your directories by performing the following actions:

Use the Visual FoxPro Project Manager to create and manage your files, segregate program files into separate directories, and avoid creating numerous generated files.

When you want to distribute your application, create an application or an executable (.exe) file instead of numerous individually generated files. This process decreases the number of files in your application's subdirectories and increases performance.

If you delete a large number of files in one directory, copy the remaining files into a new directory or optimize the directory using a defragmenting utility program.

Note:
Deleting files from a directory does not automatically speed directory searching. When a file is deleted, the file is only marked for deletion and is still included in directory searches.

When saving files, use short file paths to increase performance. For example, suppose you have a file path "C:\Program Files\Microsoft Visual FoxPro\...", which is a very long file path. Try to use shorter file paths.


Managing Temporary Files

Visual FoxPro creates temporary files for a variety of operations. For example, Visual FoxPro creates temporary files during editing, indexing, and sorting. Text editing sessions can also create a temporary or backup (.bak) copy of the edited file. By default, Visual FoxPro creates its temporary files in the same directory that Windows stores its temporary files unless you specifically designate an alternate location.

Tip:
In most cases, you should specify one location for all Visual FoxPro temporary files. Make sure that the location you specify contains enough space for all possible temporary files.

For more information, see How to: Specify the Location of Temporary Files.


Searching for Temporary Files

When Visual FoxPro searches for temporary files, for example, when you use the SYS(2023) - Temporary Path function to retrieve the temporary files path or when the TMPFILES, EDITWORK, PROGWORK, and SORTWORK settings in a Visual FoxPro configuration file do not specify a different location, the Windows API GetTempPath is used to search for the path containing the temporary files. GetTempPath searches a sequence of variables that differ depending on the operating system. Microsoft Windows 2000 and later include user variables that store the location of temporary files, while Microsoft Windows 95, 98, and Me include only global system environment variables for this purpose.

On Windows 2000 and later, GetTempPath, and therefore, SYS(2023), TMPFILES, EDITWORK, PROGWORK, and SORTWORK, searches the TMP user variable for the location of temporary files by default. If the TMP user variable does not specify a location, Visual FoxPro searches the following variables in a specific order:

TMP system variable.

TEMP user variable.

TEMP system variable.


If these variables do not specify a location, the location for storing temporary files defaults to the home drive and path, or the Temp folder in the user's Documents and Settings directory.

Note:
If more than one value is specified for TMP or TEMP, then the first value is used.


On Windows 95, 98, and Me, GetTempPath searches the TMP and TEMP global system variables in that order and then searches the current directory.

For more information, see SYS(2023) - Temporary Path and Special Terms for Configuration Files.



See Also

Optimizing Visual FoxPro in a Multiuser Environment

Optimizing Visual FoxPro Startup Speed

Optimizing Your System

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--------------------------



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Optimizing Visual FoxPro Startup Speed


Though Visual FoxPro is always fast, you can optimize the startup and operating speed. This section describes enhancing Visual FoxPro performance by managing startup speed and optimizing SET commands.



Managing Startup Speed

The time required to load and start Visual FoxPro relates to the physical size of Visual FoxPro, the length of the PATH statement in effect, the number of items to be found at startup, and other factors. You can control the load size, the search path, component file locations, and the startup SET command values of Visual FoxPro.


Managing File Locations

Visual FoxPro stores the FoxUser.dbf file, which contains user settings, in the user's Application Data directory by default. You can display this location by typing ? HOME(7) in the Command window. Visual FoxPro searches for the FoxUser.dbf and Config.fpw files in the following places:

¡EIn the startup application or executable file, if any. For example, you can start a Visual FoxPro application by typing the following code on the command line:

¡@¡@VFPversionNumber.exe MyApp.app

¡V or ¡V

¡@¡@VFPversionNumber.exe MyApp.exe

If the startup application or executable file contains a Config.fpw file, the configuration file is always used. You can override settings in a Config.fpw file that are bound inside an application by specifying an external Config.fpw file, using the -C command-line switch when starting an application or Visual FoxPro.

¡EIn the working directory.

¡EAlong the path established with the PATH environment variable.

¡EIn the directory containing Visual FoxPro.


Controlling File Loading

You can also speed startup by preventing Visual FoxPro from loading files you don't plan to use. If your application does not use the FoxUser or FoxHelp file, disable them in the Config.fpw file by using the following commands:

RESOURCE = OFF
HELP = OFF

Visual FoxPro seeks all other Visual FoxPro components (GENXTAB, CONVERT, and so on) only in the Visual FoxPro directory. If you place components elsewhere, you must explicitly identify the path to those components in your Config.fpw file. For example, you might specify these locations:

_TRANSPORT = c:\migrate\transport.prg
_GENXTAB = c:\crosstab\genxtab.prg
_FOXREF = c:\coderefs\foxref.app

You can use the environment variable FOXPROWCFG to explicitly specify the location of Config.fpw. For details about the FOXPROWCFG variable, see Customizing the Visual FoxPro Environment.



Optimizing the Load Size of Visual FoxPro

If you don't plan on using any of the Visual FoxPro components listed previously, set them to an empty string to speed startup.

To optimize the load size of Visual FoxPro, use the following syntax:

cFileVariable = ""

Replace cFileVariable with _TRANSPORT, _CONVERT, or other variables as appropriate.



Optimizing Key SET Commands

You can optimize the operation of Visual FoxPro by tuning the values of certain SET commands.

The following table shows SET commands that have the greatest effect on performance, and their settings for maximum performance. You can specify SET command values by including them in the Config.fpw file, by typing them in the Command window, or by setting them in the Options dialog box.

Command Settings for Maximum Performance

----------------------------------------
SET Command¡@¡@¡@¡@¡@Performance Setting
-------------------- -------------------
SET ESCAPE Command¡@ ON
SET OPTIMIZE Command ON
SET REFRESH Command¡@0,0
SET SYSMENU Command¡@DEFAULT
SET TALK Command¡@¡@ OFF
SET VIEW Command¡@¡@ OFF
----------------------------------------



See Also

Optimizing Your System

Optimizing Visual FoxPro in a Multiuser Environment

Optimizing the Operating Environment

Customizing the Visual FoxPro Environment

SET ESCAPE Command

SET REFRESH Command

SET SYSMENU Command

Command Window (Visual FoxPro)

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Optimizing Visual FoxPro in a Multiuser Environment


When you run Visual FoxPro or Visual FoxPro applications in a multiuser environment, you can improve performance by managing storage of temporary files and controlling the way tables are shared.



Managing Temporary Files

In most multiuser environments, it is recommended that you save temporary files to local disks or memory when networked computers contain large amounts of free disk space. Redirecting storage of temporary files can improve performance by reducing frequent access to the network drive.

On small networks with older networked computers and slow hard disks, you might experience better performance by leaving Visual FoxPro temporary files on the file server; however, when in doubt, direct temporary files to the local disk. When working on large, heavily used networks, always redirect temporary files to the local disk.

By saving all temporary files to a single directory on a local hard drive, you can safely erase the contents of the temporary file directory on the file server prior to each Visual FoxPro session. This action purges the system of any temporary files that were created but not erased by Visual FoxPro due to a system reboot or power loss.

For more information about temporary files, see Optimizing the Operating Environment and How to: Specify the Location of Temporary Files.



Sharing Tables

If users share tables on a network, the way you manage access to them can affect performance.

Avoid opening and closing tables repeatedly.
Buffer write operations to tables that are not shared.
Provide exclusive access to tables.
Limit the time on locking tables.


Providing Exclusive Access

You can enhance performance for the APPEND, REPLACE, and DELETE commands and operations that run at times when no other users require access to the data, for example, overnight updates, by opening data files for exclusive use. When tables are open for exclusive use, performance improves because Visual FoxPro does not need to test the status of record or file locks.

To open data files for exclusive use, use the EXCLUSIVE clause in the USE and OPEN DATABASE commands. For more information, see USE Command and OPEN DATABASE Command.


Limiting the Time on Locking Tables

You can reduce contention between users for write access to a table or record by shortening the amount of time for locking a record or table. Instead of locking a record while the user edits it, lock the record only after it has been edited. Using optimistic row buffering provides the shortest amount of time that records are locked. For more information, see Buffering Data.



See Also

Optimizing Applications in Multiuser Environments

Optimizing Your System

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Visual FoxPro Configuration


The configuration of Visual FoxPro determines how your copy of Visual FoxPro looks and behaves. For example, you can establish the default locations for files used with Visual FoxPro, how your source code looks in an edit window, and the format of dates and times.



You can make changes to the Visual FoxPro configuration that exist for the current session only (temporary), or specify them as the default settings for the next time you start Visual FoxPro (permanent). If the settings are temporary, they are stored in memory and are discarded when you quit Visual FoxPro.

If you make permanent settings, they are stored in the Microsoft Windows registry or Visual FoxPro resource file. The Windows registry is a database that stores configuration information about the operating system, all Windows applications, OLE, and optional components such as ODBC. For example, the registry is where Windows stores the associations between file name extensions and applications so that when you click a file name, Windows can launch or activate the appropriate application.

For an example of how to change the registry, you can examine Registry.prg in the \Samples\Classes directory, which contains numerous methods based on Windows API calls and makes it possible for you to manipulate the Windows registry.

Similarly, Visual FoxPro stores its application-specific configuration information in the registry. When you start Visual FoxPro, the program reads the configuration information in the registry and sets the configuration according to those settings. After reading the registry, Visual FoxPro also checks for a configuration file, which is a text file in which you can store configuration settings to override the defaults stored in the registry. After Visual FoxPro has started, you can make additional configuration settings using the Options Dialog Box or SET commands. For more information, see How to: View and Change Environment Settings.

Note:
The run-time version of Visual FoxPro does not read the Windows registry when starting up, as registry settings are designed primarily to configure the development environment. If you intend to distribute your Visual FoxPro applications using a run-time library, you can establish configuration settings in two ways: with a configuration file, or with a program that manipulates the Windows registry on the user's computer.


Visual FoxPro also maintains a resource file, Foxuser.dbf, that stores information about the current state of the program when you quit. For example, the resource file contains information about the location and size of the Command window, current keyboard macros, the toolbars that are displayed, and so on. The Foxuser.dbf file is an ordinary Visual FoxPro table, which you can read and change as required by your application.

Tip:
If the data in the Foxuser.dbf file becomes corrupted or invalid, it can cause Visual FoxPro to behave in an erratic manner. If you do not manually store anything in the table, for example keyboard macros, deleting the table might help.



See Also

Customizing the Visual FoxPro Environment

How to: View and Change Environment Settings

Options Dialog Box (Visual FoxPro)

ODBC Registry Foundation Class

Command Window (Visual FoxPro)

How to: Change Configuration Settings in the Windows Registry

SET RESOURCE Command

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Visual FoxPro Environment Settings


You can make changes to the Visual FoxPro environment by using the Options dialog box, editing the Windows registry, overriding default configuration settings, customizing the Project Manager, and configuring Visual FoxPro toolbars.



In This Section


How to: View and Change Environment Settings

Describes how to view and change environment settings.


How to: Specify the Location of Temporary Files

Describes how to change the default location for saving temporary files in Visual FoxPro.


How to: Change Configuration Settings in the Windows Registry

Describes how configure Visual FoxPro by making changes to the Windows registry using the Registry Editor.


Setting Configuration Options at Startup

Describes how to set or override default configuration opens when starting Visual FoxPro.


How to: Specify the Configuration File

Describes how to specify or suppress configuration files when starting Visual FoxPro.


How to: Create a Configuration File

Describes how to create configuration files to use when starting Visual FoxPro.


Special Terms for Configuration Files

Provides a list of special terms you can use in configuration files.


How to: Use Command-Line Options When Starting Visual FoxPro

Explains how to specify startup options by using a command-line switch.


How to: Configure Visual FoxPro Toolbars

Describes how to customize, display, and hide toolbars.


How to: Dock Windows

Describes how to dock Visual FoxPro windows to the main Visual FoxPro window or to each other.


How to: Set Editor Options

Explains how to configure Visual FoxPro editors.


How to: Display and Print Source Code in Color

Describes how to configure settings for displaying and printing program files, methods, stored procedures, and memos in color.


Automating Keystroke Tasks with Macros

Describes how to record and save keystrokes using macros.



Related Sections


Customizing the Visual FoxPro Environment

Explains customizing development environment settings.


Visual FoxPro Configuration

Explains configuring Visual FoxPro.


Restoring the Visual FoxPro Interactive Environment

Describes closing operations and clearing the Visual FoxPro desktop to return to its interactive state.

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How to: View and Change Environment Settings


To view and change environment settings, use the Options dialog box. The Options dialog box contains a series of tabs representing different categories of environment options.



To display the Options dialog box

From the Tools menu, choose Options.

The Options dialog box appears and displays tabs from which you can choose desired settings. For details about options you can set using each tab, see the Options Dialog Box (Visual FoxPro).



Displaying Environment Settings

When Visual FoxPro is running, you can verify environment settings by using the Options dialog box or the DISPLAY STATUS Command, or by displaying the values of individual SET Commands.


To display multiple environment settings

From the Tools menu, choose Options to display the Options dialog box and view the current settings.

¡V OR ¡V

Type DISPLAY STATUS in the Command window.


To display individual environment settings

Use the SET( ) Function in the Command window to display the current value of any SET commands.

For example, to view the current status of SET TALK, type:

? SET("TALK")

Note:
Because settings are valid only for the current data session, you must capture your settings and place them in a program or a form's Init event code for every private data session.

For more information, see SET Command Overview.


To echo Options dialog box settings to the Command window

1.In the Options dialog box, make setting choices.

2.Hold down the SHIFT key and choose OK.

¡@The settings are echoed to the Command window.

3.Copy the setting commands from the Command window.



Saving Environment Settings

You can save the settings you make in the Options dialog box for the current data session or as default (permanent) settings for your copy of Visual FoxPro.


To save settings for the current session only

1.In the Options dialog box, make setting choices.

2.Choose OK.

When you save settings for the current session only, they remain in effect until you quit Visual FoxPro (or until you change them again). To save changes permanently, save them as default settings; this stores them in the Windows registry.


To save current settings as default settings

1.In the Options dialog box, make setting changes.

2.Choose Set As Default.

Note:
The Set as Default button is disabled until you make a change to the current settings.

You can override default settings by issuing SET commands or by specifying a configuration file when you start Visual FoxPro. For details, see Setting Configuration Options at Startup.



Setting the Environment Using the SET Command

You can programmatically modify most options displayed on the tabs in the Options dialog box using SET commands or by assigning a value to a system variable.

Note:
When you configure the environment using SET commands, the settings take effect only for the current session of Visual FoxPro. When you quit the program, your settings are discarded, and you must reissue the SET commands. However, you can automate this process by issuing SET commands at startup or using a configuration file. For details, see Setting Configuration Options at Startup.

Tip:
To save a configuration made with SET commands, display the Options dialog box and save your settings there.


To set the environment programmatically

Use the SET commands that you want.

For example, the following lines of code set a default path, add a clock to the status bar and use a year-month-date (yy.mm.dd) format for dates:

SET DEFAULT TO HOME()+"\VFP"
SET CLOCK ON
SET DATE TO ANSI

For more information, see SET Command Overview.



See Also

Visual FoxPro Environment Settings

Get Application Information from the Windows Registry Sample

How to: Change Configuration Settings in the Windows Registry

DISPLAY STATUS Command

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