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Language Supported in Run Times

The vfp7r.dll run-time library supports the entire language set of objects, commands and functions.

To design the vfp7t.dll as a lightweight run-time library for in-process servers, many user-input commands and functions have been removed. All Object syntax is still available, though events from visual classes such as forms are disabled. The following language categories have been removed from vfp7t.dll:

  • READ, @Get/Says
  • Menu, Popup and Bar commands and functions
  • MESSAGEBOX() and WAIT WINDOW
  • User-defined Window commands and functions

Disabled Commands that Generate Run-time Errors

The following table is a list of unsupported commands, which will generate one of these errors at run time in the vfp7t.dll library:

  • Commands: Feature is not available
  • Functions: Function is not implemented
  • System variables: Variable is not found

The unsupported commands are:

@BOX @CLASS @CLEAR
@EDIT @FILL @GET
@MENU @PROMPT @SAY
@SCROLL @TO _ALIGNMENT
_ASSIST _BEAUTIFY _BOX
_CALCMEM _CALCVALUE _CONVERTER
_COVERAGE _CUROBJ _DBLCLICK
_DIARYDATE _FOXDOC _GALLERY
_GENMENU _GENPD _GENSCRN
_GETEXPR _INDENT _LMARGIN
_PADVANCE _PBPAGE _PCOLNO
_PCOPIES _PDRIVER _PDSETUP
_PECODE _PEJECT _PEPAGE
_PLENGTH _PLINENO _PLOFFSET
_PPITCH _PQUALITY _PSCODE
_PSPACING _PWAIT _RMARGIN
_RUNACTIVEDOC _SCCTEXT _SPELLCHK
_STARTUP _TABS _THROTTLE
_TRANSPORT _WRAP ACCEPT
ACTIVATE MENU ACTIVATE POPUP ACTIVATE SCREEN
ACTIVATE WINDOW AGETCLASS() AMOUSEOBJ()
ANSITOOEM() ASELOBJ() ASSERT
ASSIST BAR() BARCOUNT()
BARPROMPT() BROWSE CALL
CHANGE CLEAR DEBUG CLEAR GETS
CLEAR MACROS CLEAR MENUS CLEAR POPUPS
CLEAR PROMPT CLEAR READ CLOSE DEBUGGER
CLOSE FORMAT CLOSE MEMO CNTBAR()
CNTPAD() COL() CREATE
CREATE CLASS CREATE CLASSLIB CREATE COLOR SET
CREATE FORM CREATE LABEL CREATE MENU
CREATE PROJECT CREATE QUERY CREATE REPORT
CREATE SCREEN DEACTIVATE MENU DEACTIVATE POPUP
DEACTIVATE WINDOW DEBUG DEBUGOUT
DEFINE BAR DEFINE BOX DEFINE MENU
DEFINE PAD DEFINE POPUP DEFINE WINDOW
EDIT   FKLABEL()
FKMAX() GETBAR() GETCOLOR()
GETCP() GETDIR() GETEXPR()
GETFILE() GETFONT() GETPAD()
GETPICT() GETPRINTER() HELP
HIDE MENU HIDE POPUP HIDE WINDOW
IMESTATUS() INPUT KEYBOARD
LOAD LOCFILE() MCOL()
MDOWN() MENU MENU TO
MENU() MESSAGEBOX() MODIFY Commands
MOUSE MOVE POPUP MOVE WINDOW
MRKBAR() MRKPAD() MROW()
MWINDOW() OBJNUM() OBJVAR()
OEMTOANSI() ON BAR() ON ESCAPE
ON EXIT Commands ON KEY ON KEY LABEL
ON PAD ON PAGE ON READERROR
ON SELECTION BAR ON SELECTION MENU ON SELECTION PAD
ON SELECTION POPUP PAD() PLAY MACRO
POP KEY POP MENU POP POPUP
POPUP() PRMBAR() PRMPAD()
PROMPT() PUSH KEY PUSH MENU
PUSH POPUP PUTFILE() RDLEVEL()
READ READ MENU READKEY()
REGIONAL RELEASE BAR RELEASE MENUS
RELEASE PAD RELEASE POPUPS RELEASE WINDOWS
RESTORE MACROS RESTORE SCREEN RESTORE WINDOW
ROW() SAVE MACROS SAVE SCREEN
SAVE WINDOWS SCROLL SHOW GET(S)
SHOW MENU SHOW OBJECT SHOW POPUP
SHOW WINDOW SIZE POPUP SIZE WINDOW
SKPBAR() SKPPAD() SUSPEND
VARREAD() WAIT WBORDER()
WCHILD() WCOLS() WEXIST()
WFONT() WLAST() WLCOL()
WLROW() WMAXIMUM() WONTOP()
WOUTPUT() WPARENT() WREAD()
WROWS() WTITLE() WVISIBLE()
XMINIMUM() ZOOM WINDOW  

Disabled Commands that Generate No Run-time Errors

The following table is a list of unsupported commands, which will not generate an error when executed at run time in vfp7t.dll library. These functions are still disabled for use in the run time; however, because of the frequency of usage in commonly used code and class libraries between different types of applications, they do not cause an error. When one of these commands or functions is encountered in code, Visual FoxPro ignores that line of code and continues executing. This includes certain SET commands and SYS functions.

DOEVENTS    
SET ASSERTS SET BELL SET BORDER
SET BROWSEME SET BRSTATUS SET CONSOLE
SET COLOR SET CLEAR SET CLOCK
SET COVERAGE SET CONFIRM SET CURSOR
SET CPDIALOG SET DEBUGOUT SET DEBUG
SET DEVELOPMENT SET DELIMITERS SET DISPLAY
SET DOHISTORY SET ESCAPE SET ECHO
SET EVENTLIST SET EVENTTRACKING SET FORMAT
SET FUNCTION SET HELP SET INTENSITY
SET MARK OF SET MACDESKTOP SET MACKEY
SET MARGIN SET MESSAGE SET NOTIFY
SET ODOMETER SET PALETTE SET PDSETUP
SET READBORDER SET REFRESH SET RESOURCE
SET SAFETY SET SKIP OF SET STICKY
SET STATUS SET SYSMENU SET TALK
SET TRBETWEEN SET TYPEAHEAD SET VIEW
SET WINDOW SYS(1037) SYS(18)
SYS(103) SYS(2002) SYS(1270)
SYS(2017) SYS(4204) SYS(2016)

The following table lists the properties and functions added to Visual FoxPro to make it easier to manage Automation clients and servers. See each topic for further information.

New Server language elements Description
COMARRAY( ) Function Specifies how arrays are passed to COM objects.
COMCLASSINFO( ) Function Returns registry information about a COM object such as a Visual FoxPro Automation server.
COMRETURNERROR( ) Function Populates the COM exception structure with information that Automation clients can use to determine the source of Automation server errors.
CREATEOBJECTEX( ) Function Creates an instance of a registered COM object (such as a Visual FoxPro Automation server) on a remote computer. For a Visual FoxPro in-process .dll, you can use Microsoft Transaction Server to create an instance of the .dll on a remote computer.
EVENTHANDLER( ) Function Binds a COM server event to implemented interface methods in an instantiated Visual FoxPro object.
ProcessID Property Returns the ID of the Process that created the object.
ServerName Property Contains the full path and file name for an Automation server. The ServerName property is a property of the Application object.
StartMode Property Contains a numeric value that indicates how the instance of Visual FoxPro was started.
SYS(2334) – Automation Server Invocation Mode Returns a value that indicates how a Visual FoxPro automation server method was invoked.
SYS(2335) – Unattended Server Mode Enables or disables support for modal states in distributable Visual FoxPro .exe Automation servers.
SYS(2336) - Critical Section Support Function Controls access of critical section in Multi-threaded servers.
SYS(2339) - Internal Global Variable Function Returns current value of internal global variable called g_fCallCoFreeOnRelease.
ThreadID Property Returns the ID of the thread on which the object was created.

See Also

Selection of a Run-Time Library | Automation Server Programming Notes | Interoperability and the Internet | Control of Call Blocking | Selection of Process Types |