我从自定义 Colordialog 类和其他自定义 Colordialog 中获取了一部分。
第一类已经实现了 Title 属性。
这是第一堂课（标记答案翻译为VBNET）：如何更改ColorDialog的标题？
第二类已经实现了颜色的实时选择。
这是第二类（标记的答案）：在确认对话框之前，在 ColorDialog 仍然打开时获取颜色属性？
不幸的是，对于 Location 属性，我对如何在对话框中实现它一无所知，甚至已经搜索了解决方案。
好吧，现在我正在尝试合并这两段代码以获得强大的“默认”ColorDialog。
使用 Title 属性转换为 VB.NET 的自定义 ColorDialog 类正在工作，但是当我尝试合并这两个类时，title 属性不起作用，我可以更改属性字段中的标题值但不显示任何标题（ColorDialog 标题是空的）。
我的问题是我需要对此类进行哪些更改才能使 Title 属性正常工作，以及如果我愿意，我是否可以实现“位置”属性以轻松在屏幕上重新定位 ColorDialog，例如：MyColorDialog.Location = new point ()，我之前尝试过使用 RECT 结构。
这是我进行更改的合并类的重要部分：
（Title 属性的东西被分开并单独注释。）
Imports System.Runtime.InteropServices
Public Class Colordialog_Realtime
Inherits ColorDialog
#Region " Title property things"
<DllImport("user32.dll")> _
Private Shared Function SetWindowText(hWnd As IntPtr, lpString As String) As Boolean
End Function
Private m_title As String = String.Empty
Private titleSet As Boolean = False
Public Property Title() As String
Get
Return m_title
End Get
Set(value As String)
If value IsNot Nothing AndAlso value <> m_title Then
m_title = value
titleSet = False
End If
End Set
End Property
#End Region
Public Event CurrentColor(ByVal c As Color)
Private Const GA_ROOT As Integer = 2
Private Const WM_CTLCOLOREDIT As Integer = &H133
Public Declare Function GetAncestor Lib "user32.dll" _
(ByVal hWnd As IntPtr, ByVal gaFlags As Integer) As IntPtr
Private EditWindows As List(Of ApiWindow) = Nothing
Public Sub New()
' Me.FullOpen = True
End Sub
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Protected Overrides Function HookProc(ByVal hWnd As IntPtr, ByVal msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr
' Title property things"
If Not titleSet Then
SetWindowText(hWnd, m_title)
titleSet = True
End If
' End of title property things
Select Case msg
Case WM_CTLCOLOREDIT
If IsNothing(EditWindows) Then
Dim mainWindow As IntPtr = GetAncestor(hWnd, GA_ROOT)
If Not mainWindow.Equals(IntPtr.Zero) Then
EditWindows = New List(Of ApiWindow)((New WindowsEnumerator).GetChildWindows(mainWindow, "Edit"))
End If
End If
If Not IsNothing(EditWindows) AndAlso EditWindows.Count = 6 Then
Dim strRed As String = WindowsEnumerator.WindowText(EditWindows(3).hWnd)
Dim strGreen As String = WindowsEnumerator.WindowText(EditWindows(4).hWnd)
Dim strBlue As String = WindowsEnumerator.WindowText(EditWindows(5).hWnd)
Dim Red, Green, Blue As Integer
If Integer.TryParse(strRed, Red) Then
If Integer.TryParse(strGreen, Green) Then
If Integer.TryParse(strBlue, Blue) Then
RaiseEvent CurrentColor(Color.FromArgb(Red, Green, Blue))
End If
End If
End If
End If
End Select
Return MyBase.HookProc(hWnd, msg, wParam, lParam)
End Function
End Class
这是其他类：
Class ApiWindow
Public hWnd As IntPtr
Public ClassName As String
Public MainWindowTitle As String
End Class
Class WindowsEnumerator
Private Delegate Function EnumCallBackDelegate(ByVal hwnd As IntPtr, ByVal lParam As Integer) As Integer
Private Declare Function EnumWindows Lib "user32" _
(ByVal lpEnumFunc As EnumCallBackDelegate, ByVal lParam As Integer) As Integer
Private Declare Function EnumChildWindows Lib "user32" _
(ByVal hWndParent As IntPtr, ByVal lpEnumFunc As EnumCallBackDelegate, ByVal lParam As Integer) As Integer
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" _
(ByVal hwnd As IntPtr, ByVal lpClassName As System.Text.StringBuilder, ByVal nMaxCount As Integer) As Integer
Private Declare Function IsWindowVisible Lib "user32" (ByVal hwnd As IntPtr) As Integer
Private Declare Function GetParent Lib "user32" (ByVal hwnd As IntPtr) As Integer
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As System.Text.StringBuilder) As Integer
Private _listChildren As New List(Of ApiWindow)
Private _listTopLevel As New List(Of ApiWindow)
Private _topLevelClass As String = String.Empty
Private _childClass As String = String.Empty
Public Overloads Function GetTopLevelWindows() As ApiWindow()
EnumWindows(AddressOf EnumWindowProc, &H0)
Return _listTopLevel.ToArray
End Function
Public Overloads Function GetTopLevelWindows(ByVal className As String) As ApiWindow()
_topLevelClass = className
Return Me.GetTopLevelWindows()
End Function
Public Overloads Function GetChildWindows(ByVal hwnd As Int32) As ApiWindow()
_listChildren.Clear()
EnumChildWindows(hwnd, AddressOf EnumChildWindowProc, &H0)
Return _listChildren.ToArray
End Function
Public Overloads Function GetChildWindows(ByVal hwnd As Int32, ByVal childClass As String) As ApiWindow()
_childClass = childClass
Return Me.GetChildWindows(hwnd)
End Function
Private Function EnumWindowProc(ByVal hwnd As Int32, ByVal lParam As Int32) As Int32
If GetParent(hwnd) = 0 AndAlso IsWindowVisible(hwnd) Then
Dim window As ApiWindow = GetWindowIdentification(hwnd)
If _topLevelClass.Length = 0 OrElse window.ClassName.ToLower() = _topLevelClass.ToLower() Then
_listTopLevel.Add(window)
End If
End If
Return 1
End Function
Private Function EnumChildWindowProc(ByVal hwnd As Int32, ByVal lParam As Int32) As Int32
Dim window As ApiWindow = GetWindowIdentification(hwnd)
If _childClass.Length = 0 OrElse window.ClassName.ToLower() = _childClass.ToLower() Then
_listChildren.Add(window)
End If
Return 1
End Function
Private Function GetWindowIdentification(ByVal hwnd As Integer) As ApiWindow
Dim classBuilder As New System.Text.StringBuilder(64)
GetClassName(hwnd, classBuilder, 64)
Dim window As New ApiWindow
window.ClassName = classBuilder.ToString()
window.MainWindowTitle = WindowText(hwnd)
window.hWnd = hwnd
Return window
End Function
Public Shared Function WindowText(ByVal hwnd As IntPtr) As String
Const W_GETTEXT As Integer = &HD
Const W_GETTEXTLENGTH As Integer = &HE
Dim SB As New System.Text.StringBuilder
Dim length As Integer = SendMessage(hwnd, W_GETTEXTLENGTH, 0, 0)
If length > 0 Then
SB = New System.Text.StringBuilder(length + 1)
SendMessage(hwnd, W_GETTEXT, SB.Capacity, SB)
End If
Return SB.ToString
End Function
End Class