用以学习EnumWindowsProc、SendMessage、WindowFromPoint、WindowFromPoint、ShowWindow、EnableWindow、FindWindow等等API的用法

共有3个窗体，分别为form1,form2,form3,和一个模块Module1

form1代码：form1有label(0~5)标签，text1、text2.。。。text5等5个textBox

Private Sub Form_Load()
    Success = SetWindowPos(Me.hwnd,-1,3)
    Me.Left = Screen.Width - 1900
    Me.Top = Screen.Height - 1710
End Sub


Private Sub Form_Unload(Cancel As Integer)
    End
End Sub



Private Sub Label1_MouseUp(Index As Integer,Button As Integer,Shift As Integer,x As Single,y As Single)
    If Button And 2 Then PopupMenu Form3.tfile
End Sub




Private Sub Timer1_Timer()

If GetAsyncKeyState(vbKeyF2) Then
    Form2.ListView1.ListItems.Clear
    EnumChildWindows Text1.Text,AddressOf EnumWindowsProc,ByVal 0&
    Form2.Show
End If
If GetAsyncKeyState(vbKeyF3) Then
    Clipboard.Clear
    Clipboard.SetText Text4.Text
    MsgBox "窗口标题已保存至剪贴板。",vbOKOnly,"提示"
End If
    
    Static lX As Long,lY As Long,stayTime As Long
    On Local Error Resume Next
    Dim P As POINTAPI,h As Long,hD As Long,r As Long
    GetCursorPos P

    lX = P.x: lY = P.y
    Px.x = P.x
    Px.y = P.y
    
'设备环境是一个结构，它定义了一系列图形对象及其相关的属性，以及会影响输出结果的绘图方式。这些图形对象包括：画笔（用于画直线），
'笔刷（用于绘图和填充），位图（用于屏幕的拷贝或滚动），调色板（用于定义可用的颜色集），剪裁区（用于剪裁和其他操作），路径（用
'于绘图和画图操作）。设备环境函数用于对设备环境进行创建、删除或获取信息
    h = WindowFromPoint(lX,lY) '取得点所在控件的句柄
    hD = GetDC(h)
    ScreenToClient h,P
    r = GetPixel(hD,P.x,P.y)
    ReleaseDC h,hD
    Text1.Text = h
    Text2.Text = hD
    Text3.Text = Hex(r)
    Text3.BackColor = r
    
    
    Dim WindowText As String,ClassName As String
    WindowText = String(64,0)
    GetWindowText Text1.Text,WindowText,Len(WindowText)
    ClassName = String(64,0)
    GetClassName Text1.Text,ClassName,64
    Text4.Text = Left(WindowText,InStr(1,vbNullChar) - 1)
    Text5.Text = Left(ClassName,vbNullChar) - 1)

End Sub

form2代码：form2只有一个listview1控件

Private Sub ListView1_MouseUp(Button As Integer,y As Single)
If Trim(ListView1.SelectedItem.ListSubItems(2).Text) = "可用" Then
   Form3.tenable = False
   Form3.tdisable = True
Else
   Form3.tenable = True
   Form3.tdisable = False
End If

If Trim(ListView1.SelectedItem.ListSubItems(3).Text) = "可见" Then
   Form3.tshow = False
   Form3.thide = True
Else
   Form3.tshow = True
   Form3.thide = False
End If

If Button And 2 Then PopupMenu Form3.tedit
End Sub

form3是菜单，无控件，菜单内容请看代码：

Private Sub tdisable_Click()
  Dim i As Long
  i = EnableWindow(Form2.ListView1.SelectedItem.Text,0)  '第2参非0即为ENABLE
  Form2.ListView1.SelectedItem.ListSubItems(2).Text = "禁用"
End Sub

Private Sub tenable_Click()
  Dim i As Long
  Dim s As String
  i = EnableWindow(Form2.ListView1.SelectedItem.Text,1)  '第2参非0即为ENABLE
  Form2.ListView1.SelectedItem.ListSubItems(2).Text = "可用"
End Sub

Private Sub tshow_Click()
  Dim i As Long
  i = ShowWindow(Form2.ListView1.SelectedItem.Text,1)  '第2参非0即为ENABLE
  Form2.ListView1.SelectedItem.ListSubItems(3).Text = "可见"
End Sub

Private Sub thide_Click()
  Dim i As Long
  i = ShowWindow(Form2.ListView1.SelectedItem.Text,0)  '第2参非0即为ENABLE
  Form2.ListView1.SelectedItem.ListSubItems(3).Text = "隐藏"
End Sub

Private Sub tquit_Click()
End
End Sub


Private Sub tunlock_Click()

Const WM_USER = &H400
Const EM_SETREADONLY = (WM_USER + 31)



  Dim i As Long
  i = SendMessage(Form2.ListView1.SelectedItem.Text,EM_SETREADONLY,True,ByVal 0&)

End Sub

module1的代码：

Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String,ByVal lpWindowName As String) As Long
Public Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Public Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long,ByVal hdc As Long) As Long
Public Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long,ByVal x As Long,ByVal y As Long) As Long
Public Declare Function ScreenToClient Lib "user32" (ByVal hwnd As Long,lpPoint As POINTAPI) As Long
Public Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long,ByVal yPoint As Long) As Long

Public Declare Function SetWindowPos Lib "user32" (ByVal h&,ByVal hb%,ByVal x%,ByVal y%,ByVal cx%,ByVal cy%,ByVal f%) As Integer
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long,ByVal lpString As String,ByVal cch As Long) As Long
Public Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hwnd As Long) As Long
Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long,ByVal lpClassName As String,ByVal nMaxCount As Long) As Long
Public Declare Function EnumChildWindows Lib "user32" (ByVal hWndParent As Long,ByVal lpEnumFunc As Long,ByVal lParam As Long) As Long
Public Declare Function IsWindowEnabled Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function IsWindowVisible Lib "user32" (ByVal hwnd As Long) As Long

Public Declare Function EnableWindow Lib "user32" (ByVal hwnd As Long,ByVal fEnable As Long) As Long
Public Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long,ByVal nCmdShow As Long) As Long

Public Declare Function ReleaseCapture Lib "user32" () As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long,ByVal wMsg As Long,ByVal wParam As Long,lParam As Any) As Long

'截获热键
Public Declare Function GetAsyncKeyState Lib "user32" (ByVal vkey As Long) As Integer

Public Type POINTAPI
x As Long
y As Long
End Type


Public Function EnumWindowsProc(ByVal hnd As Long,ByVal lParam As Long) As Boolean
    Dim sSave As String,Ret As Long
    
    Dim isEnabled As Boolean,IsEn As String
    Dim isVisable As Boolean,IsVi As String
    
    isEnabled = IsWindowEnabled(hnd)
    isVisable = IsWindowVisible(hnd)
    
    If isEnabled = True Then
       IsEn = "  可用"
    Else
       IsEn = "  禁用"
    End If
    
    If isVisable = True Then
       IsVi = "  可见"
    Else
       IsVi = "  隐藏"
    End If
      
    Ret = GetWindowTextLength(hnd)
    sSave = Space(Ret)
    GetWindowText hnd,sSave,Ret + 1
    
    Dim ClassName As String
    ClassName = String(64,0)
    GetClassName hnd,64
    ClassName = Left(ClassName,vbNullChar) - 1)
    
    
    Dim ListTemp As Variant
      Set ListTemp = Form2.ListView1.ListItems.Add(,hnd)
      ListTemp.SubItems(1) = sSave
      ListTemp.SubItems(2) = IsEn
      ListTemp.SubItems(3) = IsVi
      ListTemp.SubItems(4) = ClassName
    
    EnumWindowsProc = True '=true继续列举到结束,=false则停止列举
    
End Function

仅供大家参考学习，偶尔用于解除某些软件中按钮的限制，呵呵，当然不要报太大希望，人家都有防止此类情况的措施的。

代码下载链接：http://download.csdn.net/detail/icbyboy/5005114