Message.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / Message.cs / 1305376 / Message.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms {
    using System.Text; 
    using System.Runtime.InteropServices;
    using System.Runtime.Remoting;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis; 
    using System.Security;
    using System.Security.Permissions; 
    using System; 
    using System.Windows.Forms;
 

    /// 
    /// 
    ///     
    ///       Implements a Windows message.
    ///  
    [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] 
    [SuppressMessage("Microsoft.Security", "CA2108:ReviewDeclarativeSecurityOnValueTypes")]
    public struct Message { 
#if DEBUG
        static TraceSwitch AllWinMessages = new TraceSwitch("AllWinMessages", "Output every received message");
#endif
 
        IntPtr hWnd;
        int msg; 
        IntPtr wparam; 
        IntPtr lparam;
        IntPtr result; 

        /// 
        /// 
        ///    Specifies the window handle of the message. 
        /// 
 
        public IntPtr HWnd { 
            get { return hWnd; }
            set { hWnd = value; } 
        }

        /// 
        ///  
        ///    Specifies the ID number for the message.
        ///  
        public int Msg { 
            get { return msg; }
            set { msg = value; } 
        }

        /// 
        ///  
        /// Specifies the  of the message.
        ///  
        public IntPtr WParam { 
            get { return wparam; }
            set { wparam = value; } 
        }

        /// 
        ///  
        /// Specifies the  of the message.
        ///  
        public IntPtr LParam { 
            get { return lparam; }
            set { lparam = value; } 
        }

        /// 
        ///  
        ///    Specifies the return value of the message.
        ///  
        public IntPtr Result { 
             get { return result; }
             set { result = value; } 
        }

        /// 
        ///  
        /// Gets the  value, and converts the value to an object.
        ///  
        public object GetLParam(Type cls) { 
            return UnsafeNativeMethods.PtrToStructure(lparam, cls);
        } 

        /// 
        /// 
        /// Creates a new  object. 
        /// 
        public static Message Create(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam) { 
            Message m = new Message(); 
            m.hWnd = hWnd;
            m.msg = msg; 
            m.wparam = wparam;
            m.lparam = lparam;
            m.result = IntPtr.Zero;
 
#if DEBUG
            if(AllWinMessages.TraceVerbose) { 
                Debug.WriteLine(m.ToString()); 
            }
#endif 
            return m;
        }

        ///  
        public override bool Equals(object o) {
            if (!(o is Message)) { 
                return false; 
            }
 
            Message m = (Message)o;
            return hWnd == m.hWnd &&
                   msg == m.msg &&
                   wparam == m.wparam && 
                   lparam == m.lparam &&
                   result == m.result; 
        } 

        public static bool operator !=(Message a, Message b) { 
            return !a.Equals(b);
        }

        public static bool operator ==(Message a, Message b) { 
            return a.Equals(b);
        } 
 
        /// 
        public override int GetHashCode() { 
            return (int)hWnd << 4 | msg;
        }

        ///  
        /// 
        ///  
        ///  
        public override string ToString() {
            // ----URT : 151574. Link Demand on System.Windows.Forms.Message 
            // fails to protect overriden methods.
            bool unrestricted = false;
            try
            { 
                IntSecurity.UnmanagedCode.Demand();
                unrestricted = true; 
            } 
            catch (SecurityException)
            { 
                // eat the exception.
            }

            if (unrestricted) 
            {
                return MessageDecoder.ToString(this); 
            } 
            else
            { 
                return base.ToString();
            }
        }
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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