Env$

ENV$(<variable>)

The Env$(var$) returns the current value of the environment variable. The Env$ function can be used to obtain the value of any user-created or system-created environment variable that can be displayed with the operating system's SET (or set) command. To see a list of these variables, enter the SET command with no parameters at the operating system prompt.

The Env$ function is used to retrieve an environmental variable's value which was set with SetEnv or inherited from Windows' environmental variables.

Example:

got1$=env$("UserName")
got2$=env$("GUIMode")

Additionally the status command showing all set environmental variables is:

Status Env

The Env$ internal function can be set by CONFIG SETENV. For example, use the following command to set the value of env$("librarypath"):

config setenv librarypath f:\apps\library\

Operating system ENV$ variables cannot be set or altered by CONFIG SETENV. Other system Env$ variables will be added.

Comments and Examples

As an example, if LOGNAME contains the login name, the following line in a menu program would require a user to log in as "root" to be able to run program PROG14.

00040 if env$("LogName")="root" then chain "Prog14" else goto SHOWMENU

Technical Considerations

1. Unix / Linux versions of Business Rules require that user-created environment variables be passed by an export command to the operating system before the user enters Business Rules . Otherwise, the values of these variables cannot be returned by ENV$.

Env$("GUIMode")

There is a BR provided Env$ variable called GUIMODE (case insensitive). It's value is either ON or OFF depending on whether BR is in GUI mode. System ENV$ variables cannot be set or altered by CONFIG SETENV. Other system Env$ variables will be added.

ENVIRONMENT INTERROGATION

ENV$("STATUS [ .sub-keyword ] ... " [, mat config$ [, search-arg] ...] )

ENV$ returns a string, or in the event that MAT CONFIG$ is provided, ENV$ redimensions and loads it. For a list of valid keywords issue a STATUS ENV command. If an array is specified, it may be followed by one or more case insensitive substrings which are regarded as restricting search arguments. For example:

ENV$("SERVER_PLATFORM")      

returns “WINDOWS”

The following program displays all STATUS information that contains the word “file”:

00100    dim CONFIG$(1)*100
00120    let ENV$("STATUS",MAT CONFIG$,"file")
00140    print MAT CONFIG$

The above program produces the following output:

CHAINDFLT   - Look for object files with source first.
EDITOR C:\PROGRAM FILES\MILLS ENTERPRISE\MYEDITBR\MYEDITBR.EXE
FILENAMES LOWER_CASE
OPTION 23 is OFF - prevent data conversion errors from moving file position
OPTION 25 is ON - make FILE$(0) be CON: if in windows
OPTION 26 is OFF - suppress creation of .BAK files
OPTION 29 is ON - save programs as .WB files
OPTION 33 is 64 - locking position for large file support
OPTION 49 is OFF - use relative path for spool file
OPTION 51 is OFF - recover deleted records for all files
SPOOLCMD prt.bat [SPOOLFILE] [COPIES] [PRINTER]
Server File: :c:\wbserver.dat
BR Config File: :C:\ADS\SYS\br.d\brconfig.sys
Executable File: :C:\ADS\SYS\br.d\ 
brserver-430beta+q-Win32-DebugEfence-2011-03-20.exe
Serial File: :C:\ADS\SYS\br.d\brserial.dat
Workfile path: :c:\ads
Open File #  0  :CON:

If you just want the options with the word file then use:

00100    dim CONFIG$(1)*100
00120    let ENV$("STATUS.CONFIG.OPTION",MAT CONFIG$,"file")
00140    print MAT CONFIG$

Which produces:

OPTION 23 is OFF - prevent data conversion errors from moving file position
OPTION 25 is ON - make FILE$(0) be CON: if in windows
OPTION 26 is OFF - suppress creation of .BAK files
OPTION 29 is ON - save programs as .WB files
OPTION 33 is 64 - locking position for large file support
OPTION 49 is OFF - use relative path for spool file
OPTION 51 is OFF - recover deleted records for all files 

Note that while keywords are case insensitive, they must be correctly specified, whereas search arguments are more “friendly”. For a complete list of valid keywords, issue the command:

STATUS ENV -p

Some of the keywords supported are:

ENV$("CLIENT_PLATFORM") is "WINDOWS"
ENV$("CLIENT_PLATFORM.BR_BUILD_TYPE") is "DebugEfence"
ENV$("CLIENT_PLATFORM.BR_BUILD_DATE") is "2011-05-12"
ENV$("CLIENT_PLATFORM.BR_BITS") is "32"
ENV$("CLIENT_PLATFORM.OS_BITS") is "64"
ENV$("CLIENT_PLATFORM.OS_VERSION_NAME") is "Windows 7"
ENV$("CLIENT_PLATFORM.OS_VERSION_NUMBER") is "6.1"
ENV$("SERVER_PLATFORM") is "LINUX"
ENV$("SERVER_PLATFORM.BR_BUILD_TYPE") is "DebugEfence"
ENV$("SERVER_PLATFORM.BR_BUILD_DATE") is "2011-05-13"
ENV$("SERVER_PLATFORM.BR_BITS") is "64"
ENV$("SERVER_PLATFORM.OS_BITS") is ""
ENV$("SERVER_PLATFORM.OS_VERSION_NAME") is "#36-Ubuntu SMP Thu Jun 3 20:38:33 UTC 2010"
ENV$("SERVER_PLATFORM.OS_VERSION_NUMBER") is "2.6.32-22-server"	
BR_MODEL		  “CLIENT/SERVER” or “COMBINED”

Monitor Configuration Interrogation

ENV$("MONITOR1 | MONITOR2", MAT <num-arrayname>)

This redimensions num-arrayname to 4 elements and returns X (horizontal) and Y (vertical), of the upper left corner, and Width and Height in pixels of the current setting for either monitor 1 or monitor 2. Monitor 2 can be regarded as an extension of monitor 1 concerning the total video space.

Example Program (cut and paste into a text editor – then LOAD file SOURCE):

00010    let MONITORS$ = ENV$("monitor_count")
00020    let MONITORS = VAL(MONITORS$)
00030    print MONITORS
00040    for I = 1 to MONITORS
00050       let ENV$("monitor"&STR$(I), MAT TEST)
00060       for J = 1 to 4
00070          print TEST(J);
00080       next J
00090       print 
00100    next I

Results for 2 monitors of differing sizes:

2
0 0 1280 1024 
1280 0 1024 768