Private Declare Function NtQuerySystemInformation Lib "ntdll" (ByVal dwInfoType As Long, ByVal lpStructure As Long, ByVal dwSize As Long, ByVal dwReserved As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDst As Any, pSrc As Any, ByVal ByteLen As Long)
Private liOldIdleTime As LARGE_INTEGER
Private liOldSystemTime As LARGE_INTEGER
Public Sub Initialize()
Dim SysTimeInfo As SYSTEM_TIME_INFORMATION
Dim SysPerfInfo As SYSTEM_PERFORMANCE_INFORMATION
Dim Ret As Long
'get new system time
Ret = NtQuerySystemInformation(SYSTEM_TIMEINFORMATION, VarPtr(SysTimeInfo), LenB(SysTimeInfo), 0&)
If Ret <> NO_ERROR Then
Debug.Print "Error while initializing the system's time!", vbCritical
Exit Sub
End If
'get new CPU's idle time
Ret = NtQuerySystemInformation(SYSTEM_PERFORMANCEINFORMATION, VarPtr(SysPerfInfo), LenB(SysPerfInfo), ByVal 0&)
If Ret <> NO_ERROR Then
Debug.Print "Error while initializing the CPU's idle time!", vbCritical
Exit Sub
End If
'store new CPU's idle and system time
liOldIdleTime = SysPerfInfo.liIdleTime
liOldSystemTime = SysTimeInfo.liKeSystemTime
End Sub
Public Function Query() As Long
Dim SysBaseInfo As SYSTEM_BASIC_INFORMATION
Dim SysPerfInfo As SYSTEM_PERFORMANCE_INFORMATION
Dim SysTimeInfo As SYSTEM_TIME_INFORMATION
Dim dbIdleTime As Currency
Dim dbSystemTime As Currency
Dim Ret As Long
Query = -1
'get number of processors in the system
Ret = NtQuerySystemInformation(SYSTEM_BASICINFORMATION, VarPtr(SysBaseInfo), LenB(SysBaseInfo), 0&)
If Ret <> NO_ERROR Then
Debug.Print "Error while retrieving the number of processors!", vbCritical
Exit Function
End If
'get new system time
Ret = NtQuerySystemInformation(SYSTEM_TIMEINFORMATION, VarPtr(SysTimeInfo), LenB(SysTimeInfo), 0&)
If Ret <> NO_ERROR Then
Debug.Print "Error while retrieving the system's time!", vbCritical
Exit Function
End If
'get new CPU's idle time
Ret = NtQuerySystemInformation(SYSTEM_PERFORMANCEINFORMATION, VarPtr(SysPerfInfo), LenB(SysPerfInfo), ByVal 0&)
If Ret <> NO_ERROR Then
Debug.Print "Error while retrieving the CPU's idle time!", vbCritical