form1.vb

Visual.Basic.NET实用编程百例-47.6M.zip

Friend Class Form1
	Inherits System.Windows.Forms.Form
#Region "Windows 窗体设计器生成的代码"
	Public Sub New()
		MyBase.New()
        '此调用是 Windows 窗体设计器所必需的。
		InitializeComponent()
	End Sub
	'窗体重写处置，以清理组件列表。
	Protected Overloads Overrides Sub Dispose(ByVal Disposing As Boolean)
		If Disposing Then
			If Not components Is Nothing Then
				components.Dispose()
			End If
		End If
		MyBase.Dispose(Disposing)
	End Sub
	'Windows 窗体设计器所必需的
	Private components As System.ComponentModel.IContainer
	Public ToolTip1 As System.Windows.Forms.ToolTip
	Public WithEvents pb1 As AxMSComctlLib.AxProgressBar
	Public WithEvents Timer1 As System.Windows.Forms.Timer
	Public WithEvents Label1 As System.Windows.Forms.Label
	'注意: 以下过程是 Windows 窗体设计器所必需的
	'可以使用 Windows 窗体设计器来修改它。
	'不要使用代码编辑器修改它。
	<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))
        Me.ToolTip1 = New System.Windows.Forms.ToolTip(Me.components)
        Me.pb1 = New AxMSComctlLib.AxProgressBar
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.Label1 = New System.Windows.Forms.Label
        CType(Me.pb1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'pb1
        '
        Me.pb1.Location = New System.Drawing.Point(0, 40)
        Me.pb1.Name = "pb1"
        Me.pb1.OcxState = CType(resources.GetObject("pb1.OcxState"), System.Windows.Forms.AxHost.State)
        Me.pb1.Size = New System.Drawing.Size(353, 25)
        Me.pb1.TabIndex = 1
        '
        'Timer1
        '
        Me.Timer1.Interval = 1000
        '
        'Label1
        '
        Me.Label1.BackColor = System.Drawing.SystemColors.Control
        Me.Label1.Cursor = System.Windows.Forms.Cursors.Default
        Me.Label1.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Label1.Size = New System.Drawing.Size(329, 25)
        Me.Label1.TabIndex = 0
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.SystemColors.Control
        Me.ClientSize = New System.Drawing.Size(356, 71)
        Me.Controls.Add(Me.pb1)
        Me.Controls.Add(Me.Label1)
        Me.Cursor = System.Windows.Forms.Cursors.Default
        Me.Location = New System.Drawing.Point(163, 101)
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "Form1"
        Me.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.StartPosition = System.Windows.Forms.FormStartPosition.Manual
        Me.Text = "CPU使用情况"
        CType(Me.pb1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
#End Region 
  
	
	Dim hQuery As Integer
	Dim Counters(99) As CounterInfo
	Dim currentCounterIdx As Integer
	Dim iPerformanceDetail As PERF_DETAIL
	
	Private Sub AddCounter(ByRef strCounterName As String, ByRef hQuery As Integer)
		Dim pdhStatus As PDH_STATUS
		Dim hCounter As Integer
		
		pdhStatus = PdhVbAddCounter(hQuery, strCounterName, hCounter)
		Counters(currentCounterIdx).hCounter = hCounter
		Counters(currentCounterIdx).strName = strCounterName
		currentCounterIdx = currentCounterIdx + 1
	End Sub
	
	'  显示利用率信息
	Private Sub UpdateValues()
		Dim dblCounterValue As Double
		Dim pdhStatus As Integer
		Dim strInfo As String
		Dim i As Integer
		
		PdhCollectQueryData(hQuery)
		
		i = 0
		dblCounterValue = PdhVbGetDoubleCounterValue(Counters(i).hCounter, pdhStatus)
		
		'  将CPU利用率信息显示在标签中
		If (pdhStatus = PDH_STATUS.PDH_CSTATUS_VALID_DATA) Or (pdhStatus = PDH_STATUS.PDH_CSTATUS_NEW_DATA) Then
            strInfo = "CPU 使用率： " & VB6.Format(dblCounterValue, "0.00")
			pb1.Value = dblCounterValue
            Me.Text = VB6.Format(dblCounterValue, "0") & "% - CPU 当前状态"
		End If
		
		Label1.Text = strInfo
	End Sub
	
	Private Sub Form1_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
		Dim pdhStatus As PDH_STATUS
		
		pdhStatus = PdhOpenQuery(0, 1, hQuery)
		If pdhStatus <> ERROR_SUCCESS Then
			MsgBox("OpenQuery failed")
			End
		End If
		
		' 添加处理器查询
		AddCounter("\Processor(0)\% Processor Time", hQuery)
		UpdateValues()
		Timer1.Enabled = True
	End Sub
	
	'  更新CPU利用率信息
	Private Sub Timer1_Tick(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles Timer1.Tick
		UpdateValues()
	End Sub
	
    Private Sub Form1_Closed(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Closed
        Timer1.Enabled = False
        PdhCloseQuery(hQuery)
    End Sub
End Class