NtQuerySystemInformation

2OOO, 24 December

NTSYSAPI 
NTSTATUS
NTAPI


NtQuerySystemInformation(



  IN SYSTEM_INFORMATION_CLASS SystemInformationClass,
  OUT PVOID               SystemInformation,
  IN ULONG                SystemInformationLength,
  OUT PULONG              ReturnLength OPTIONAL );

NtQuerySystemInformation is used to check some system informations avaiable only in KernelMode (above 0x80000000). All avaiable (or all known) information classes are described in SYSTEM_INFORMATION_CLASS.

SystemInformationClass Information class (see SYSTEM_INFORMATION_CLASS).

SystemInformation User-allocated buffer for results. Sometimes this parameter can be NULL (OPTIONAL), if you check required buffer size (see below).

SystemInformationLength Length of SystemInformation buffer (in bytes).

ReturnLength Required length of SystemInformation buffer.

Documented by:

Sven B. Schreiber

Tomasz Nowak

Requirements:

Library: ntdll.lib

Undocumented functions of NTDLL