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Contents derived from the Wikipedia article on Visual FoxPro

Visual FoxPro

From Wikipedia, the free encyclopedia

Visual FoxPro is a data-centric object-oriented and procedural programming language produced by Microsoft. It is derived from FoxPro (originally known as FoxBASE) which was developed by Fox Technologies beginning in 1984; Fox Technologies merged with Microsoft in 1992 and the software acquired further features and the prefix "Visual". The last version of FoxPro (2.6) worked under Mac OS, DOS, Windows, and Unix: Visual FoxPro 3.0, the first "Visual" version, dropped the platform support to only Mac and Windows, and later versions were Windows-only. The current version of Visual FoxPro is COM-based and Microsoft has stated that they do not intend to create a Microsoft .NET version.

FoxPro is a member of the class of languages commonly referred to as "xBase" languages, which have syntax based on the dBase programming language. Other members of the xBase language family include Clipper and Recital. (A history of the early years of xBase can be found in the dBASE entry.)

Visual FoxPro, commonly abbreviated as VFP, is typically viewed by the general public as being merely a Database Management System (DBMS). This ignores the fact that it includes not only a DBMS engine, but also a full-featured Programming Language. It can be used to write not just traditional fat client applications, but also middleware and web applications.

In late 2002, some community members demonstrated that Visual FoxPro can run on Linux under the Windows emulator Wine. In 2003, this led to complaints by Microsoft: it was claimed that the deployment of runtime FoxPro code on non-Windows machines violates the End User License Agreement.[1]

Rumors suggesting that Microsoft intends to end support for FoxPro have been common since Microsoft's acquisition of the product, despite the product having one of the longest support timeframes for a Microsoft product (extended support until 2015). VFP 9 was released to manufacturing on December 17, 2004, and the Fox team is currently working on a project codenamed Sedna which will be built on top of the VFP9 codebase and consist mainly of Xbase components that support a number of interoperability scenarios with various Microsoft technologies including SQL Server 2005, .NET, WinFX, Windows Vista, and Office 12. The development of Version 9 is ongoing with a service pack that was released December 8, 2005.

On March 1, 2006, Microsoft released a Community Technology Preview (CTP) of Sedna. According to the Fox team, the current plan "for releasing Service Pack 2 for VFP 9.0 will be some time in 2007, at the same time or near the same time of the release of Sedna". The latest CTP was released on October 13, 2006 by Microsoft.

In December 2005, VFP broke into the top 20 on TIOBE's Programming Community Index for the first time. As of October 2006 it is at position 20, making it a "B" language.

Contents

1 Version information

1.1 Operating system compatibility

1.2 Information on Executable Files

2 Code samples

2.1 Object

2.2 Data handling

2.3 ODBC Access using SQL Passthrough

3 Beta code names

4 External links

5 References

Version information

Operating system compatibility

Supported Windows Versions Version VFP 6.0 VFP 7.0 VFP 8.0 VFP 9.0

Windows NT 4.0 Yes Yes No [2] No [3]

Windows 95 Yes Runtime only No [4] No

Windows 98 Yes Yes Runtime only Runtime only

Windows ME Yes Yes Runtime only Runtime only

Windows 2000 Yes Yes Yes Yes

Windows XP Yes Yes Yes Yes

Windows 2003 Yes Yes Yes Yes

Windows Vista Yes Yes Yes Yes

Information on Executable Files

Version VERSION() returns EXE Size EXE Date DLL Size DLL Name

VFP 9 Visual FoxPro 09.00.0000.2412 for Windows 5,620 kb 13-DEC-2004 4,600 kb VFP9R.DLL

VFP 8 Visual FoxPro 08.00.0000.3117 for Windows 5,236 kb 25-SEP-2003 4,200 kb VFP8R.DLL

VFP 7 Visual FoxPro 07.00.0000.9465 for Windows 4,260 kb 04-JAN-2002 3,344 kb VFP7R.DLL

VFP 6 Visual FoxPro 06.00.8961.00 for Windows 4,091 kb 18-AUG-2000 3,295 kb VFP6R.DLL

VFP 5 Visual FoxPro 5.0.0.344 4,072 kb 20-AUG-1996 3,146 kb VFP500.DLL

VFP 3 Visual FoxPro 03.00.00.0711 for Windows 4,374 kb 16-DEC-1995 3,657 kb VFP300.ESL

FPW 2.6a FoxPro 2.6a for Windows 2,444 kb 28-SEP-1994 n/a n/a

Code samples

Object

loForm = CREATEOBJECT("HiForm")

loForm.Show(1)

DEFINE CLASS HiForm AS Form

AutoCenter = .T.

Caption = "Hello, World"

ADD OBJECT lblHi as Label WITH ;

Caption = "Hello, World!"

ENDDEFINE

loMine = CREATEOBJECT("MyClass")

? loMine.cProp1 && This will work.

? loMine.cProp2 && Program Error: Property CPROP2 is not found.

? loMine.MyMethod1() && This will work.

? loMine.MyMethod2() && Program Error: Property MYMETHOD2 is not found.

DEFINE CLASS MyClass AS Custom

cProp1 = "My Property" && This is a public property

HIDDEN cProp2 && This is a private (hidden) property

PROCEDURE Init() && Class constructor

This.cProp2 = "This is a hidden property."

ENDPROC

PROCEDURE MyMethod1() && This is a public method

RETURN This.MyMethod2()

ENDPROC

HIDDEN PROCEDURE MyMethod2() && This is a private (hidden) method

RETURN This.cProp2

ENDPROC

ENDDEFINE

Data handling

* Create a table

CREATE TABLE randData (iData I)

* Populate with random data using xBase and SQL DML commands

FOR i = 1 TO 50

APPEND BLANK

REPLACE iData WITH (RAND() * 100)

INSERT INTO randData (iData) VALUES (RAND() * 100)

ENDFOR

* Place a structural index on the data

INDEX ON iData TAG iData

CLOSE ALL

* Display sorted data using xBase-style commands

USE randData

SET ORDER TO iData

GO TOP

LIST NEXT 10 && First 10 (end-of-line comment)

SKIP 81

LIST NEXT 10 && Last 10

CLOSE ALL

* Browse sorted data using SQL DML commands

SELECT * ;

FROM randData ;

ORDER BY iData DESCENDING

ODBC Access using SQL Passthrough

* Connect to an ODBC data source

LOCAL nHnd

nHnd = SQLCONNECT("ODBCDSN", "user", "pwd")

* Execue a SQL command

LOCAL nResult

nResult = SQLEXEC(nHnd, "USE master")

IF nResult < 0

MESSAGEBOX("MASTER database does not exist!")

ENDIF

* Retrieve data from the remote server and stores it in

* a local data cursor

nResult = SQLEXEC(nHnd, "SELECT * FROM authors", "QAUTHORS")

* Update a record in a remote table using parameters

LOCAL cAuthorID, cAuthorName

cAuthorID = "1001"

cAuthorName = "New name"

nResult = SQLEXEC(nHnd,"UPDATE authors SET auth_name = ?cAuthorName WHERE auth_id = ?cAuthorID")

* Close the connection

SQLDISCONNECT(nHnd)

For another sample, see the Visual FoxPro implementation of the Levenshtein Distance algorithm.

Beta code names

VFP 3 - Taz

VFP 5 - RoadRunner

VFP 6 - Tahoe

VFP 7 - Sedona

VFP 8 - Toledo

VFP 9 - Europa

VFP Next – Sedna

End of Wikipedia content, http://en.wikipedia.org/wiki/Visual_FoxPro

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