如何获取WIN2000以上系统的CPU使用率和内存使用情况？
我希望得到就像任务管理器那样的CPU使用率，在网上看了很多，统计出来都是零或者有错，谢谢。 --------------------编程问答-------------------- 在多看几个 就能有对的了 哈哈 --------------------编程问答-------------------- How To Get % Processor Time Correctly By Using the Performance Data Helper (PDH) API --------------------编程问答-------------------- 1.使用这个api NtQuerySystemInformation2.直接读注册表 --------------------编程问答-------------------- 我知道可以用WMI获取当前有百分之多少cpu和memory在使用，有多少个进程，但是不清楚可不可以查询出具体是哪些程序占用的cpu和memory，或许你可以查查WMI的classe和method。（http://msdn2.microsoft.com/en-us/library/aa389273(VS.85).aspx） --------------------编程问答-------------------- 或者看看这个帖子，看有没有帮助：
http://topic.csdn.net/u/20071217/11/7eb83a0e-3b94-4e8c-918d-2aa1dbd1baa5.html --------------------编程问答-------------------- 俺刚回复了贴子，调用的API就可以了
http://topic.csdn.net/u/20080227/22/d7cb638b-2aa9-4524-9d88-2cf1d616e397.html
--------------------编程问答--------------------
Option Explicit
Private Const SYSTEM_BASICINFORMATION = 0&
Private Const SYSTEM_PERFORMANCEINFORMATION = 2&
Private Const SYSTEM_TIMEINFORMATION = 3&
Private Const NO_ERROR = 0
Private Type LARGE_INTEGER
dwLow As Long
dwHigh As Long
End Type
Private Type SYSTEM_BASIC_INFORMATION
dwUnknown1 As Long
uKeMaximumIncrement As Long
uPageSize As Long
uMmNumberOfPhysicalPages As Long
uMmLowestPhysicalPage As Long
uMmHighestPhysicalPage As Long
uAllocationGranularity As Long
pLowestUserAddress As Long
pMmHighestUserAddress As Long
uKeActiveProcessors As Long
bKeNumberProcessors As Byte
bUnknown2 As Byte
wUnknown3 As Integer
End Type
Private Type SYSTEM_PERFORMANCE_INFORMATION
liIdleTime As LARGE_INTEGER
dwSpare(0 To 75) As Long
End Type
Private Type SYSTEM_TIME_INFORMATION
liKeBootTime As LARGE_INTEGER
liKeSystemTime As LARGE_INTEGER
liExpTimeZoneBias As LARGE_INTEGER
uCurrentTimeZoneId As Long
dwReserved As Long
End Type
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
Exit Function
End If
'CurrentValue = NewValue - OldValue
dbIdleTime = LI2Currency(SysPerfInfo.liIdleTime) - LI2Currency(liOldIdleTime)
dbSystemTime = LI2Currency(SysTimeInfo.liKeSystemTime) - LI2Currency(liOldSystemTime)
'CurrentCpuIdle = IdleTime / SystemTime
If dbSystemTime <> 0 Then dbIdleTime = dbIdleTime / dbSystemTime
'CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
dbIdleTime = 100 - dbIdleTime * 100 / SysBaseInfo.bKeNumberProcessors + 0.5
Query = Int(dbIdleTime)
'store new CPU's idle and system time
liOldIdleTime = SysPerfInfo.liIdleTime
liOldSystemTime = SysTimeInfo.liKeSystemTime
End Function
补充：VB , 基础类
