Article ID: 82002
Article Last Modified on 8/16/2005
APPLIES TO
- Microsoft QuickBasic 4.0
- Microsoft QuickBASIC 4.0b
- Microsoft QuickBasic 4.5 for MS-DOS
- Microsoft BASIC Professional Development System 7.0
- Microsoft BASIC Professional Development System 7.1
- Microsoft Cinemania 97 Standard Edition
- Microsoft Windows 3.0 Standard Edition
- Microsoft Windows 3.1 Standard Edition
- Microsoft GW-BASIC Interpreter 3.20
- Microsoft GW-BASIC Interpreter 3.23
- Microsoft GW-BASIC Interpreter 3.22
- Microsoft GW-BASIC Interpreter 3.23
This article was previously published under Q82002
SUMMARY
A Microsoft Basic program can detect whether it is running under Microsoft Windows by checking for the existence of the environment variable "windir" with the function ENVIRON$.
This information applies to Microsoft QuickBasic versions 4.0, 4.0b, and 4.5 for MS-DOS; Microsoft Basic Professional Development System (PDS) versions 7.0 and 7.1 for MS-DOS; Microsoft Basic Compiler versions 6.0 and 6.0b for MS-DOS; Microsoft GW-Basic Interpreter versions 3.2, 3.22, and 3.23 for MS-DOS; and Microsoft Windows versions 3.0 and 3.1.
MORE INFORMATION
When Windows runs a program, it supplies the environment variable named "windir" that specifies the full path of the directory where Windows is installed. Note that this environment variable name is spelled with lowercase letters.
If a Basic program is running under Microsoft Windows, the expression ENVIRON$("windir") returns a non-null string, otherwise it returns a null string.
Example Code
IF ENVIRON$("windir") <> "" THEN
PRINT "running under Windows"
ELSE
PRINT "not running under Windows"
END IF
Additional query words: QuickBas BasicCom 3.00 3.10 4.00 4.00b 4.50 6.00 6.00b 7.00 7.10
Keywords: KB82002
