Message Message Message Message Struct

Definition

Implementiert eine Windows-Meldung.Implements a Windows message.

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

Beispiele

Im folgenden Codebeispiel wird das über WndProc Schreiben der-Methode zum Verarbeiten von Betriebssystem MessageMeldungen veranschaulicht, die im identifiziert werden.The following code example demonstrates overriding the WndProc method to handle operating system messages identified in the Message. In diesem Beispiel wird die WM_ACTIVATEAPP-Betriebssystem Meldung behandelt, um zu erfahren, wann eine andere Anwendung aktiv wird.The WM_ACTIVATEAPP operating system message is handled in this example to know when another application is becoming active. Informationen zu den verfügbaren Message.MsgWerten Message.LParamfür, Message.WParam und finden Sie in der Dokumentation zur MSG-Struktur .For information about the available Message.Msg, Message.LParam, and Message.WParam values, see the MSG Structure documentation. Weitere Informationen zu den tatsächlichen Konstanten Werten finden Sie unter Nachrichten Konstanten.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.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

        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

Hinweise

Die Message -Struktur umschließt von Windows gesendete Nachrichten.The Message structure wraps messages that Windows sends. Sie können diese Struktur verwenden, um eine Nachricht zu wrappen und Sie der Fenster Prozedur zuzuweisen, die weitergeleitet werden soll.You can use this structure to wrap a message and assign it to the window procedure to be dispatched. Sie können diese Struktur auch verwenden, um Informationen über eine Meldung zu erhalten, die das System an Ihre Anwendung oder Steuerelemente sendet.You can also use this structure to get information about a message the system sends to your application or controls. Weitere Informationen zu Windows-Meldungen finden Sie unter Meldungen und NachrichtenWarteschlangen.For more information about Windows messages, see Messages and Message Queues.

Das Message kann nicht direkt erstellt werden.You cannot create the Message directly. Verwenden Sie stattdessen die Create -Methode.Instead, use the Create method. Aus Gründen der Effizienz verwendet das den Message Pool vorhandener Messages, anstatt einen neuen zu instanziieren, sofern möglich.For the sake of efficiency, the Message uses its pool of existing Messages instead of instantiating a new one, if possible. Wenn ein Message jedoch nicht im Pool verfügbar ist, wird ein neuer instanziiert.However, if a Message is not available in the pool, a new one is instantiated.

Eigenschaften

HWnd HWnd HWnd HWnd

Ruft das Fensterhandle der Meldung ab oder legt dieses fest.Gets or sets the window handle of the message.

LParam LParam LParam LParam

Gibt das LParam-Feld der Meldung an.Specifies the LParam field of the message.

Msg Msg Msg Msg

Ruft die ID-Nummer der Meldung ab oder legt diese fest.Gets or sets the ID number for the message.

Result Result Result Result

Gibt den Wert an, der als Reaktion auf die Behandlung der Meldung an Windows zurückgegeben wird.Specifies the value that is returned to Windows in response to handling the message.

WParam WParam WParam WParam

Ruft das WParam-Feld der Meldung ab oder legt dieses fest.Gets or sets the WParam field of the message.

Methoden

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

Erstellt einen neuen Message.Creates a new Message.

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

Bestimmt, ob das angegebene Objekt mit dem aktuellen Objekt identisch ist.Determines whether the specified object is equal to the current object.

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

Gibt den Hashcode für diese Instanz zurück.Returns the hash code for this instance.

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

Ruft den LParam-Wert ab und konvertiert ihn in ein Objekt.Gets the LParam value and converts the value to an object.

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

Gibt eine String zurück, die das aktuelle Message darstellt.Returns a String that represents the current Message.

Operatoren

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

Bestimmt, ob zwei Instanzen von Message gleich sind.Determines whether two instances of Message are equal.

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

Bestimmt, ob zwei Instanzen von Message ungleich sind.Determines whether two instances of Message are not equal.

Gilt für:

Siehe auch