NativeWindow NativeWindow NativeWindow NativeWindow Class

Определение

Обеспечивает низкоуровневую инкапсуляцию дескриптора окна и процедуры окна.Provides a low-level encapsulation of a window handle and a window procedure.

public ref class NativeWindow : MarshalByRefObject, System::Windows::Forms::IWin32Window
public class NativeWindow : MarshalByRefObject, System.Windows.Forms.IWin32Window
type NativeWindow = class
    inherit MarshalByRefObject
    interface IWin32Window
Public Class NativeWindow
Inherits MarshalByRefObject
Implements IWin32Window
Наследование
Реализации

Примеры

В следующем примере кода демонстрируется перехват сообщений окна операционной системы в процедуре окна и создание окна с определенной операционной системой имя класса окна.The following code example demonstrates intercepting operating system window messages in a window procedure, and creating a window with a specific operating system window class name. В примере создается два класса, которые наследуют NativeWindow этого.The example creates two classes that inherit from NativeWindow that accomplish this.

MyNativeWindowListener Класс подключается в процедуре окна формы, переданные в конструктор и переопределяет WndProc метод для перехвата WM_ACTIVATEAPP сообщения окна.The MyNativeWindowListener class hooks into the window procedure of the form passed into the constructor, and overrides the WndProc method to intercept the WM_ACTIVATEAPP window message. Класс демонстрирует использование AssignHandle и ReleaseHandle методы для определения дескриптор окна NativeWindow будет использовать.The class demonstrates the usage of the AssignHandle and ReleaseHandle methods to identify the window handle the NativeWindow will use. Дескриптор назначается в зависимости от Control.HandleCreated и Control.HandleDestroyed события.The handle is assign based upon the Control.HandleCreated and Control.HandleDestroyed events. Когда WM_ACTIVATEAPP оконное сообщение поступает, класс вызывает form1.ApplicationActivated метод.When the WM_ACTIVATEAPP window message is received, the class calls the form1.ApplicationActivated method.

MyNativeWindow Класс создает новое окно с ClassName присвоено BUTTON.The MyNativeWindow class creates a new window with the ClassName set to BUTTON. Класс демонстрирует использование CreateHandle метод и переопределение WndProc метод для перехвата сообщений окна, которые получены.The class demonstrates using the CreateHandle method and overriding the WndProc method to intercept window messages that are received.

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Runtime::InteropServices;
ref class MyNativeWindowListener;
ref class MyNativeWindow;

// Summary description for Form1.
ref class Form1: public System::Windows::Forms::Form
{
private:
   MyNativeWindowListener^ nwl;
   MyNativeWindow^ nw;

internal:
   void ApplicationActived( bool ApplicationActivated )
   {
      // The application has been activated or deactivated
      #if defined(DEBUG)
      System::Diagnostics::Debug::WriteLine( "Application Active = {0}", ApplicationActivated.ToString() );
      #endif
   }


public:
   Form1();
};

// NativeWindow class to listen to operating system messages.
ref class MyNativeWindowListener: public NativeWindow
{
private:

   // Constant value was found in the S"windows.h" header file.
   literal int WM_ACTIVATEAPP = 0x001C;
   Form1^ parent;

public:
   MyNativeWindowListener( Form1^ parent )
   {
      parent->HandleCreated += gcnew EventHandler( this, &MyNativeWindowListener::OnHandleCreated );
      parent->HandleDestroyed += gcnew EventHandler( this, &MyNativeWindowListener::OnHandleDestroyed );
      this->parent = parent;
   }

internal:

   // Listen for the control's window creation and then hook into it.
   void OnHandleCreated( Object^ sender, EventArgs^ /*e*/ )
   {
      // Window is now created, assign handle to NativeWindow.
      AssignHandle( (dynamic_cast<Form1^>(sender))->Handle );
   }

   void OnHandleDestroyed( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      // Window was destroyed, release hook.
      ReleaseHandle();
   }

protected:

   virtual void WndProc( Message %m ) override
   {
      // Listen for operating system messages
      switch ( m.Msg )
      {
         case WM_ACTIVATEAPP:

            // Notify the form that this message was received.
            // Application is activated or deactivated,
            // based upon the WParam parameter.
            parent->ApplicationActived( ((int)m.WParam != 0) );
            break;
      }
      NativeWindow::WndProc( m );
   }

};

// MyNativeWindow class to create a window given a class name.
ref class MyNativeWindow: public NativeWindow
{
private:

   // Constant values were found in the S"windows.h" header file.
   literal int WS_CHILD = 0x40000000,WS_VISIBLE = 0x10000000,WM_ACTIVATEAPP = 0x001C;
   int windowHandle;

public:
   MyNativeWindow( Form^ parent )
   {
      CreateParams^ cp = gcnew CreateParams;

      // Fill in the CreateParams details.
      cp->Caption = "Click here";
      cp->ClassName = "Button";

      // Set the position on the form
      cp->X = 100;
      cp->Y = 100;
      cp->Height = 100;
      cp->Width = 100;

      // Specify the form as the parent.
      cp->Parent = parent->Handle;

      // Create as a child of the specified parent
      cp->Style = WS_CHILD | WS_VISIBLE;

      // Create the actual window
      this->CreateHandle( cp );
   }

protected:

   // Listen to when the handle changes to keep the variable in sync

   virtual void OnHandleChange() override
   {
      windowHandle = (int)this->Handle;
   }

   virtual void WndProc( Message % m ) override
   {
      // Listen for messages that are sent to the button window. Some messages are sent
      // to the parent window instead of the button's window.
      switch ( m.Msg )
      {
         case WM_ACTIVATEAPP:
            
            // Do something here in response to messages
            break;
      }
      NativeWindow::WndProc( m );
   }
};

Form1::Form1()
{
   this->Size = System::Drawing::Size( 300, 300 );
   this->Text = "Form1";
   nwl = gcnew MyNativeWindowListener( this );
   nw = gcnew MyNativeWindow( this );
}

// The main entry point for the application.

[STAThread]
int main()
{
   Application::Run( gcnew Form1 );
}
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace NativeWindowApplication
{

    // Summary description for Form1.
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    public class Form1 : System.Windows.Forms.Form
    {
        private MyNativeWindowListener nwl;
        private MyNativeWindow nw;

        internal void ApplicationActivated(bool ApplicationActivated)
        {
            // The application has been activated or deactivated
            System.Diagnostics.Debug.WriteLine("Application Active = " + ApplicationActivated.ToString());
        }

        private Form1()
        {
            this.Size = new System.Drawing.Size(300, 300);
            this.Text = "Form1";

            nwl = new MyNativeWindowListener(this);
            nw = new MyNativeWindow(this);

        }

        // The main entry point for the application.
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }
    }

    // NativeWindow class to listen to operating system messages.
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    internal class MyNativeWindowListener : NativeWindow
    {

        // Constant value was found in the "windows.h" header file.
        private const int WM_ACTIVATEAPP = 0x001C;

        private Form1 parent;

        public MyNativeWindowListener(Form1 parent)
        {

            parent.HandleCreated += new EventHandler(this.OnHandleCreated);
            parent.HandleDestroyed += new EventHandler(this.OnHandleDestroyed);
            this.parent = parent;
        }

        // Listen for the control's window creation and then hook into it.
        internal void OnHandleCreated(object sender, EventArgs e)
        {
            // Window is now created, assign handle to NativeWindow.
            AssignHandle(((Form1)sender).Handle);
        }
        internal void OnHandleDestroyed(object sender, EventArgs e)
        {
            // Window was destroyed, release hook.
            ReleaseHandle();
        }
        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
        protected override void WndProc(ref Message m)
        {
            // Listen for operating system messages

            switch (m.Msg)
            {
                case WM_ACTIVATEAPP:

                    // Notify the form that this message was received.
                    // Application is activated or deactivated, 
                    // based upon the WParam parameter.
                    parent.ApplicationActivated(((int)m.WParam != 0));

                    break;
            }
            base.WndProc(ref m);
        }
    }

    // MyNativeWindow class to create a window given a class name.
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    internal class MyNativeWindow : NativeWindow
    {

        // Constant values were found in the "windows.h" header file.
        private const int WS_CHILD = 0x40000000,
                          WS_VISIBLE = 0x10000000,
                          WM_ACTIVATEAPP = 0x001C;

        private int windowHandle;

        public MyNativeWindow(Form parent)
        {

            CreateParams cp = new CreateParams();

            // Fill in the CreateParams details.
            cp.Caption = "Click here";
            cp.ClassName = "Button";

            // Set the position on the form
            cp.X = 100;
            cp.Y = 100;
            cp.Height = 100;
            cp.Width = 100;

            // Specify the form as the parent.
            cp.Parent = parent.Handle;

            // Create as a child of the specified parent
            cp.Style = WS_CHILD | WS_VISIBLE;

            // Create the actual window
            this.CreateHandle(cp);
        }

        // Listen to when the handle changes to keep the variable in sync
        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
        protected override void OnHandleChange()
        {
            windowHandle = (int)this.Handle;
        }

        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
        protected override void WndProc(ref Message m)
        {
            // Listen for messages that are sent to the button window. Some messages are sent
            // to the parent window instead of the button's window.

            switch (m.Msg)
            {
                case WM_ACTIVATEAPP:
                    // Do something here in response to messages
                    break;
            }
            base.WndProc(ref m);
        }
    }
}
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Runtime.InteropServices

<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Public Class Form1
    Inherits System.Windows.Forms.Form

    Private nwl As MyNativeWindowListener
    Private nw As MyNativeWindow

    Friend Sub ApplicationActivated(ByVal ApplicationActivated As Boolean)
        ' The application has been activated or deactivated
        System.Diagnostics.Debug.WriteLine("Application Active = " + ApplicationActivated.ToString())
    End Sub

    Private Sub New()
        MyBase.New()

        Me.Size = New System.Drawing.Size(300, 300)
        Me.Text = "Form1"

        nwl = New MyNativeWindowListener(Me)
        nw = New MyNativeWindow(Me)

    End Sub

    Public Shared Sub Main()
        Application.Run(New Form1())
    End Sub
End Class

' NativeWindow class to listen to operating system messages.
Friend Class MyNativeWindowListener
    Inherits NativeWindow

    ' Constant value was found in the "windows.h" header file.
    Private Const WM_ACTIVATEAPP As Integer = &H1C

    Private parent As Form1

    Public Sub New(ByVal parent As Form1)

        AddHandler parent.HandleCreated, AddressOf Me.OnHandleCreated
        AddHandler parent.HandleDestroyed, AddressOf Me.OnHandleDestroyed
        Me.parent = parent
    End Sub

    ' Listen for the control's window creation and hook into it.    
    Private Sub OnHandleCreated(ByVal sender As Object, ByVal e As EventArgs)
        ' Window is now created, assign handle to NativeWindow.
        AssignHandle(CType(sender, Form).Handle)
    End Sub

    Private Sub OnHandleDestroyed(ByVal sender As Object, ByVal e As EventArgs)
        ' Window was destroyed, release hook.
        ReleaseHandle()
    End Sub

    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
        Protected Overrides Sub WndProc(ByRef m As Message)
        ' Listen for operating system messages

        Select Case (m.Msg)
            Case WM_ACTIVATEAPP

                ' Notify the form that this message was received.
                ' Application is activated or deactivated, 
                ' based upon the WParam parameter.
                parent.ApplicationActivated(m.WParam.ToInt32() <> 0)

        End Select

        MyBase.WndProc(m)
    End Sub
End Class

' MyNativeWindow class to create a window given a class name.
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Friend Class MyNativeWindow
    Inherits NativeWindow

    ' Constant values were found in the "windows.h" header file.
    Private Const WS_CHILD As Integer = &H40000000, _
                  WS_VISIBLE As Integer = &H10000000, _
                  WM_ACTIVATEAPP As Integer = &H1C

    Private windowHandle As Integer

    Public Sub New(ByVal parent As Form)

        Dim cp As CreateParams = New CreateParams()

        ' Fill in the CreateParams details.
        cp.Caption = "Click here"
        cp.ClassName = "Button"

        ' Set the position on the form
        cp.X = 100
        cp.Y = 100
        cp.Height = 100
        cp.Width = 100

        ' Specify the form as the parent.
        cp.Parent = parent.Handle

        ' Create as a child of the specified parent
        cp.Style = WS_CHILD Or WS_VISIBLE

        ' Create the actual window
        Me.CreateHandle(cp)
    End Sub

    ' Listen to when the handle changes to keep the variable in sync
    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
    Protected Overrides Sub OnHandleChange()
        windowHandle = Me.Handle.ToInt32()
    End Sub

    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
        Protected Overrides Sub WndProc(ByRef m As Message)
        ' Listen for messages that are sent to the button window. Some messages are sent
        ' to the parent window instead of the button's window.

        Select Case (m.Msg)
            Case WM_ACTIVATEAPP
                ' Do something here in response to messages
        End Select

        MyBase.WndProc(m)
    End Sub

End Class

Комментарии

Этот класс автоматически управляет созданием и класса окна регистрации.This class automatically manages window class creation and registration.

Окно не под сбор мусора, когда оно связано с дескриптором окна.A window is not eligible for garbage collection when it is associated with a window handle. Чтобы обеспечить правильную сборку мусора, дескрипторы должны быть либо уничтожены вручную с помощью DestroyHandle или освобожден посредством ReleaseHandle.To ensure proper garbage collection, handles must either be destroyed manually using DestroyHandle or released using ReleaseHandle.

Примечание

ReleaseHandle Был вызван при обработке сообщения WM_NCDESTROY.The ReleaseHandle method is called when the WM_NCDESTROY message is processed. Это означает, что существуют случаи, в который, будучи не нужно вручную вызвать ReleaseHandle, но рекомендуется сделать это.This means there are cases in which when you do not need to manually call ReleaseHandle, but it is good practice to do so.

NativeWindow Класс предоставляет следующие свойства и методы управления дескрипторами: Handle, CreateHandle, AssignHandle, DestroyHandle, и ReleaseHandle.The NativeWindow class provides the following properties and methods to manage handles: Handle, CreateHandle, AssignHandle, DestroyHandle, and ReleaseHandle.

Конструкторы

NativeWindow() NativeWindow() NativeWindow() NativeWindow()

Инициализирует экземпляр класса NativeWindow.Initializes an instance of the NativeWindow class.

Свойства

Handle Handle Handle Handle

Получает дескриптор данного окна.Gets the handle for this window.

Методы

AssignHandle(IntPtr) AssignHandle(IntPtr) AssignHandle(IntPtr) AssignHandle(IntPtr)

Назначает дескриптор данному окну.Assigns a handle to this window.

CreateHandle(CreateParams) CreateHandle(CreateParams) CreateHandle(CreateParams) CreateHandle(CreateParams)

Создает окно и его дескриптор, используя указанные параметры создания.Creates a window and its handle with the specified creation parameters.

CreateObjRef(Type) CreateObjRef(Type) CreateObjRef(Type) CreateObjRef(Type)

Создает объект, который содержит всю необходимую информацию для создания прокси-сервера, используемого для взаимодействия с удаленным объектом.Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.

(Inherited from MarshalByRefObject)
DefWndProc(Message) DefWndProc(Message) DefWndProc(Message) DefWndProc(Message)

Вызывает процедуру окна по умолчанию, связанную с этим окном.Invokes the default window procedure associated with this window.

DestroyHandle() DestroyHandle() DestroyHandle() DestroyHandle()

Уничтожает окно и его дескриптор.Destroys the window and its handle.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Определяет, равен ли заданный объект текущему объекту.Determines whether the specified object is equal to the current object.

(Inherited from Object)
Finalize() Finalize() Finalize() Finalize()

Освобождает ресурсы, связанные с данным окном.Releases the resources associated with this window.

FromHandle(IntPtr) FromHandle(IntPtr) FromHandle(IntPtr) FromHandle(IntPtr)

Извлекает окно, связанное с указанным дескриптором.Retrieves the window associated with the specified handle.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Служит хэш-функцией по умолчанию.Serves as the default hash function.

(Inherited from Object)
GetLifetimeService() GetLifetimeService() GetLifetimeService() GetLifetimeService()

Извлекает объект обслуживания во время существования, который управляет политикой времени существования данного экземпляра.Retrieves the current lifetime service object that controls the lifetime policy for this instance.

(Inherited from MarshalByRefObject)
GetType() GetType() GetType() GetType()

Возвращает объект Type для текущего экземпляра.Gets the Type of the current instance.

(Inherited from Object)
InitializeLifetimeService() InitializeLifetimeService() InitializeLifetimeService() InitializeLifetimeService()

Получает объект службы времени существования для управления политикой времени существования для этого экземпляра.Obtains a lifetime service object to control the lifetime policy for this instance.

(Inherited from MarshalByRefObject)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Создает неполную копию текущего объекта Object.Creates a shallow copy of the current Object.

(Inherited from Object)
MemberwiseClone(Boolean) MemberwiseClone(Boolean) MemberwiseClone(Boolean) MemberwiseClone(Boolean)

Создает неполную копию текущего объекта MarshalByRefObject.Creates a shallow copy of the current MarshalByRefObject object.

(Inherited from MarshalByRefObject)
OnHandleChange() OnHandleChange() OnHandleChange() OnHandleChange()

Задает метод уведомления, вызываемый при изменении дескриптора окна.Specifies a notification method that is called when the handle for a window is changed.

OnThreadException(Exception) OnThreadException(Exception) OnThreadException(Exception) OnThreadException(Exception)

Будучи переопределен в производном классе, управляет необработанным исключением потока.When overridden in a derived class, manages an unhandled thread exception.

ReleaseHandle() ReleaseHandle() ReleaseHandle() ReleaseHandle()

Освобождает дескриптор, связанный с данным окном.Releases the handle associated with this window.

ToString() ToString() ToString() ToString()

Возвращает строку, представляющую текущий объект.Returns a string that represents the current object.

(Inherited from Object)
WndProc(Message) WndProc(Message) WndProc(Message) WndProc(Message)

Вызывает процедуру окна по умолчанию, связанную с этим окном.Invokes the default window procedure associated with this window.

Безопасность

SecurityPermission
для непосредственного вызывающего на вызов неуправляемого кода.for the immediate caller to call unmanaged code. Связанное перечисление: UnmanagedCodeAssociated enumeration: UnmanagedCode

Применяется к

Дополнительно