SysUtils.GetEnvironmentVariable Function

Retrieves an environment variable value.

Pascal

function GetEnvironmentVariable(const Name: string): string; overload;

C++

AnsiString GetEnvironmentVariable(const AnsiString Name);

Call GetEnvironmentVariable to retrieve the value of an environment variable, passed as Name, for the current process.

Note: The case of the specified environment variable Name is ignored.

The following table defines the standard environment variables for Microsoft Windows.

Environment variable name	Environment value
ALLUSERSPROFILE	Generic user profile.
APPDATA	Path of the application data folder.
CLIENTNAME	Name of Client machine.
COMMONPROGRAMFILES	Path of common program files folder.
COMPUTERNAME	Name of Computer code is running on.
COMSPEC	Path of the cmd.exe program.
HOMEDRIVE	Current home drive designation, such as 'C:'
HOMEPATH	Path to current location for document storage.
LOGONSERVER
NUMBER_OF_PROCESSORS	Number of processors on current machine.
OS	Base name of the Operating System. Note that Windows XP is given as Windows_NT.
PATH	The current program path.
PATHEXT
PROCESSOR_ARCHITECTURE	Type of CPU architecture. For example, X86 for Intel Pentium processors.
PROCESSOR_IDENTIFIER
PROCESSOR_LEVEL	More detailed description of the CPU architecture.
PROCESSOR_REVISION	Processor revision level.
PROGRAMFILES	Path of the program files folder.
SESSIONNAME	Name of the current OS session.
SYSTEMDRIVE	Drive the OS operates from.
SYSTEMROOT
TEMP	Path of the temporary files folder.
TMP
USERDOMAIN
USERNAME	Name of the current user.
USERPROFILE	Path of the folder holding the current user's information.
WINDIR	Path of the Windows folder.

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