Message Message Message Message Struct

定義

Windows メッセージを実装します。Implements a Windows message.

public value class Message
public struct Message
type Message = struct
Public Structure Message
継承

オーバーライドする次のコード例に示します、WndProcで識別されるオペレーティング システムのメッセージを処理するメソッド、Messageします。The following code example demonstrates overriding the WndProc method to handle operating system messages identified in the Message. 別のアプリケーションがアクティブになるタイミングを把握するには、この例では、WM_ACTIVATEAPP オペレーティング システムのメッセージが処理されます。The WM_ACTIVATEAPP operating system message is handled in this example to know when another application is becoming active. 使用可能な方法についてはMessage.MsgMessage.LParam、およびMessage.WParam値を参照してください、 MSG 構造体ドキュメント。For information about the available Message.Msg, Message.LParam, and Message.WParam values, see the MSG Structure documentation. 実際の定数の値については、次を参照してください。メッセージ定数します。For information about the actual constant values, see Message Constants.

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Security::Permissions;

namespace csTempWindowsApplication1
{
   public ref class Form1: public System::Windows::Forms::Form
   {
   private:

      // Constant value was found in the "windows.h" header file.
      static const Int32 WM_ACTIVATEAPP = 0x001C;
      Boolean appActive;

   public:
      Form1()
      {
         appActive = true;
         this->Size = System::Drawing::Size( 300, 300 );
         this->Text = "Form1";
         this->Font = gcnew System::Drawing::Font( "Microsoft Sans Serif",18.0F,System::Drawing::FontStyle::Bold,System::Drawing::GraphicsUnit::Point,((System::Byte)(0)) );
      }


   protected:
      virtual void OnPaint( PaintEventArgs^ e ) override
      {
         
         // Paint a string in different styles depending on whether the
         // application is active.
         if ( appActive )
         {
            e->Graphics->FillRectangle( SystemBrushes::ActiveCaption, 20, 20, 260, 50 );
            e->Graphics->DrawString( "Application is active", this->Font, SystemBrushes::ActiveCaptionText, 20, 20 );
         }
         else
         {
            e->Graphics->FillRectangle( SystemBrushes::InactiveCaption, 20, 20, 260, 50 );
            e->Graphics->DrawString( "Application is Inactive", this->Font, SystemBrushes::ActiveCaptionText, 20, 20 );
         }
      }


      [SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
      virtual void WndProc( Message% m ) override
      {
         
         // Listen for operating system messages.
         switch ( m.Msg )
         {
            case WM_ACTIVATEAPP:
               
               // The WParam value identifies what is occurring.
               appActive = (int)m.WParam != 0;
               
               // Invalidate to get new text painted.
               this->Invalidate();
               break;
         }
         Form::WndProc( m );
      }

   };

}


[STAThread]
int main()
{
   Application::Run( gcnew csTempWindowsApplication1::Form1 );
}

using System;
using System.Drawing;
using System.Windows.Forms;

namespace csTempWindowsApplication1
{
    public class Form1 : System.Windows.Forms.Form
    {
        // Constant value was found in the "windows.h" header file.
        private const int WM_ACTIVATEAPP = 0x001C;
        private bool appActive = true;

        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }
        
        public Form1()
        {
            this.Size = new System.Drawing.Size(300,300);
            this.Text = "Form1";
            this.Font = new System.Drawing.Font("Microsoft Sans Serif", 18F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
        }

        protected override void OnPaint(PaintEventArgs e) 
        {
            // Paint a string in different styles depending on whether the
            // application is active.
            if (appActive) 
            {
                e.Graphics.FillRectangle(SystemBrushes.ActiveCaption,20,20,260,50);
                e.Graphics.DrawString("Application is active", this.Font, SystemBrushes.ActiveCaptionText, 20,20);
            }
            else 
            {
                e.Graphics.FillRectangle(SystemBrushes.InactiveCaption,20,20,260,50);
                e.Graphics.DrawString("Application is Inactive", this.Font, SystemBrushes.ActiveCaptionText, 20,20);
            }
        }

	[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)
            {
                // The WM_ACTIVATEAPP message occurs when the application
                // becomes the active application or becomes inactive.
                case WM_ACTIVATEAPP:

                    // The WParam value identifies what is occurring.
                    appActive = (((int)m.WParam != 0));

                    // Invalidate to get new text painted.
                    this.Invalidate();

                    break;                
            }
            base.WndProc(ref m);
        }
    }
}
Imports System
Imports System.Drawing
Imports System.Windows.Forms

Namespace csTempWindowsApplication1

    Public Class Form1
        Inherits System.Windows.Forms.Form

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

        <STAThread()> _
        Shared Sub Main()
            Application.Run(New Form1())
        End Sub 'Main

        Public Sub New()
            MyBase.New()

            Me.Size = New System.Drawing.Size(300, 300)
            Me.Text = "Form1"
            Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 18.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        End Sub

        Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)

            ' Paint a string in different styles depending on whether the
            ' application is active.
            If (appActive) Then
                e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, 20, 20, 260, 50)
                e.Graphics.DrawString("Application is active", Me.Font, SystemBrushes.ActiveCaptionText, 20, 20)
            Else
                e.Graphics.FillRectangle(SystemBrushes.InactiveCaption, 20, 20, 260, 50)
                e.Graphics.DrawString("Application is Inactive", Me.Font, SystemBrushes.ActiveCaptionText, 20, 20)
            End If
        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)
                ' The WM_ACTIVATEAPP message occurs when the application
                ' becomes the active application or becomes inactive.
            Case WM_ACTIVATEAPP

                    ' The WParam value identifies what is occurring.
                    appActive = (m.WParam.ToInt32() <> 0)

                    ' Invalidate to get new text painted.
                    Me.Invalidate()

            End Select
            MyBase.WndProc(m)
        End Sub
    End Class
End Namespace

注釈

Message構造体は Windows が送信するメッセージをラップします。The Message structure wraps messages that Windows sends. メッセージをラップし、ディスパッチするウィンドウ プロシージャに割り当てるには、この構造体を使用できます。You can use this structure to wrap a message and assign it to the window procedure to be dispatched. システムは、アプリケーションまたはコントロールに送信メッセージに関する情報を取得するのにこの構造体を使用することもできます。You can also use this structure to get information about a message the system sends to your application or controls. Windows メッセージの詳細については、次を参照してください。メッセージとメッセージ キューします。For more information about Windows messages, see Messages and Message Queues.

作成することはできません、Message直接します。You cannot create the Message directly. 代わりに、使用、Createメソッド。Instead, use the Create method. 、効率を高める、Message既存のプールを使用してMessage可能であれば、新しくをインスタンス化ではなく秒。For the sake of efficiency, the Message uses its pool of existing Messages instead of instantiating a new one, if possible. ただし場合、Messageは、プールでは使用できない、新しくインスタンス化されます。However, if a Message is not available in the pool, a new one is instantiated.

プロパティ

HWnd HWnd HWnd HWnd

メッセージのウィンドウ ハンドルを取得または設定します。Gets or sets the window handle of the message.

LParam LParam LParam LParam

メッセージの LParam フィールドを指定します。Specifies the LParam field of the message.

Msg Msg Msg Msg

メッセージの ID 番号を取得または設定します。Gets or sets the ID number for the message.

Result Result Result Result

メッセージの処理に応答して Windows に返される値を指定します。Specifies the value that is returned to Windows in response to handling the message.

WParam WParam WParam WParam

メッセージの WParam フィールドを取得または設定します。Gets or sets the WParam field of the message.

メソッド

Create(IntPtr, Int32, IntPtr, IntPtr) Create(IntPtr, Int32, IntPtr, IntPtr) Create(IntPtr, Int32, IntPtr, IntPtr) Create(IntPtr, Int32, IntPtr, IntPtr)

新しい Message を作成します。Creates a new Message.

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

指定したオブジェクトが、現在のオブジェクトと等しいかどうかを判断します。Determines whether the specified object is equal to the current object.

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

このインスタンスのハッシュ コードを返します。Returns the hash code for this instance.

GetLParam(Type) GetLParam(Type) GetLParam(Type) GetLParam(Type)

LParam 値を取得し、取得した値をオブジェクトに変換します。Gets the LParam value and converts the value to an object.

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

現在の String を表す Message を返します Returns a String that represents the current Message.

演算子

Equality(Message, Message) Equality(Message, Message) Equality(Message, Message) Equality(Message, Message)

Message の 2 つのインスタンスが等しいかどうかを判断します。Determines whether two instances of Message are equal.

Inequality(Message, Message) Inequality(Message, Message) Inequality(Message, Message) Inequality(Message, Message)

Message の 2 つのインスタンスが等しくないかどうかを判断します。Determines whether two instances of Message are not equal.

適用対象

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