我有一个软件，耗时很多
为了不影响用户使用
我希望是在CPU使用率低的时候执行
在CPU使用率高的时候就暂停执行
现在的问题是
如何得到CPU的使用率啊？
就是如何得到当前CPU的使用率
在任务管理器中可以看到
不知道如何用API得到？
请知道的告诉我一下
谢谢了
为了不影响用户使用
我希望是在CPU使用率低的时候执行
在CPU使用率高的时候就暂停执行
现在的问题是
如何得到CPU的使用率啊？
就是如何得到当前CPU的使用率
在任务管理器中可以看到
不知道如何用API得到？
请知道的告诉我一下
谢谢了
' -----------------------------------------------------------------------------
' CPU Meter Version 1.0 by X-LEAD
' -----------------------------------------------------------------------------
' mail me any comments, updates or errors to: [email protected]
' -----------------------------------------------------------------------------
' most api declarations are picked from the API Guide ... get it for free at:
' http://kpdweb.cjb.net/apiguide/index.htm ... this program is a must have for
' vb-programmers ...
' -----------------------------------------------------------------------------
' if anyone knows how to draw the statusbar with GDI or how to place the
' complete CPU Meter in the systemtray next to the clock ... please let me know
' -----------------------------------------------------------------------------
'
Option Explicit' api declaration to get the cursors position
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long' declare type to store the coordinates
Private Type POINTAPI
X As Long
Y As Long
End Type' api declarations for our CPU meter
Private Declare Function QueryPerformanceCounter Lib "kernel32" (lpPerformanceCount As LARGE_INTEGER) As Long
Private Declare Function QueryPerformanceFrequency Lib "kernel32" (lpFrequency As LARGE_INTEGER) As LongConst REG_DWORD = 4
Const HKEY_DYN_DATA = &H80000006Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As LongPrivate Type LARGE_INTEGER
lowpart As Long
highpart As Long
End Type' api declarations to raise our form
Private Declare Function DrawFrameControl Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal un1 As Long, ByVal un2 As Long) As Long
Private Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function OffsetRect Lib "user32" (lpRect As RECT, ByVal X As Long, ByVal Y As Long) As LongConst DFC_BUTTON = 4
Const DFCS_BUTTON3STATE = &H10Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type' api declarations to make form stay on top
Private Declare Function SetWindowPos Lib "user32" (ByVal hWnd As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As LongConst SWP_NOMOVE = &H2
Const SWP_NOSIZE = &H1
Const SWP_SHOWWINDOW = &H40
Const HWND_TOPMOST = -1
Const HWND_NOTTOPMOST = -2
Private Sub Form_Load() ' set the two timer intervals
tmrFormMove.Interval = 1
tmrCpuStatus.Interval = 500 'used 500 cause our program needs resources too
' color the background shape and picturebox
shpBack.BackColor = RGB(0, 10, 90)
shpBack.BorderColor = RGB(0, 10, 90)
picStatus.BackColor = RGB(130, 130, 170)
' raise our form
RaiseForm
' initialize our CPU meter
InitCPU
End Sub
Private Sub RaiseForm()
Dim R As RECT
Me.ScaleMode = vbPixels
SetRect R, 0, 0, Me.ScaleWidth, Me.ScaleHeight
DrawFrameControl Me.hdc, R, DFC_BUTTON, DFCS_BUTTON3STATE
OffsetRect R, 0, 22End Sub
Private Sub InitCPU() Dim lData As Long
Dim lType As Long
Dim lSize As Long
Dim hKey As Long
Dim Qry As String
Qry = RegOpenKey(HKEY_DYN_DATA, "PerfStats\StartStat", hKey)
If Qry <> 0 Then
MsgBox "Could not open registery!"
End
End If
lType = REG_DWORD
lSize = 4
Qry = RegQueryValueEx(hKey, "KERNEL\CPUUsage", 0, lType, lData, lSize)
Qry = RegCloseKey(hKey)End Sub
Private Sub tmrFormMove_Timer()
Dim Point As POINTAPI
' get the cursorposition
GetCursorPos Point ' multiply the coordinates to convert twips to pixel and place the form
Me.Left = Point.X * 15 + 200
Me.Top = Point.Y * 15 + 150
' make our form stay on top
SetWindowPos Me.hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE + SWP_NOMOVE
End Sub
Private Sub tmrCpuStatus_Timer() Dim lData As Long
Dim lType As Long
Dim lSize As Long
Dim hKey As Long
Dim Qry As String
Dim Status As Long
Qry = RegOpenKey(HKEY_DYN_DATA, "PerfStats\StatData", hKey)
If Qry <> 0 Then
MsgBox "Could not open registery!"
End
End If
lType = REG_DWORD
lSize = 4
Qry = RegQueryValueEx(hKey, "KERNEL\CPUUsage", 0, lType, lData, lSize)
Status = Int(lData) ' show CPU usage in Label
lblStatus.Caption = Status & "%"
' show CPU usage in our selfmade progressbar
' when CPU usage is over 80% then color the status red
If Status < 80 Then
picStatus.Line (Status, 0)-(0, 10), RGB(255, 245, 85), BF
Else
picStatus.Line (Status, 0)-(0, 10), RGB(245, 10, 0), BF
End If
picStatus.Line (Status, 0)-(100, 10), RGB(130, 130, 170), BF
Qry = RegCloseKey(hKey)End Sub
可以使用PDH.DLL实现查询
只能获取NT内核系统的
9x系统可以读取注册表