// ntddsysenv.h

typedef struct _SYSENV_VARIABLE {
  GUID  VendorGuid;
  ULONG VariableNameLength;
  WCHAR VariableName[ANYSIZE_ARRAY];
} SYSENV_VARIABLE, *PSYSENV_VARIABLE;
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Windows Driver Kit DDI reference (ns-ntddsysenv-_sysenv_variable)

_SYSENV_VARIABLE structure

Description

Stores the name a system environment variable using SysEnv device. This structure is used in the IOCTL_SYSENV_GET_VARIABLE request.

Members

`VendorGuid`

The vendor GUID.

`VariableNameLength`

The length of the string pointed to by VariableName, which contains the name of the variable.

`VariableName`

A string that contains the name of the variable.

SYSENV_VARIABLE - NtDoc