结构用途说明Implements a Windows message.
Properties
1.public IntPtr HWnd { get; set; }
Gets or sets the window handle of the message.
System.IntPtr A platform-specific type that is used to represent a pointer or a handle.
2.public IntPtr LParam { get; set; }
Specifies the LParam field of the message.
ReMarks:
The value of this field depends on the message. Use the LParam field to get information that is important for handling the message.
LParam is typically used to store an object if it is needed by the message. Use the GetLParam method to retrieve and convert information from the LParam field into an object.
此属性通常用来存储消息所需要的一个对象，使用GetLParam方法从LParam检索并转换信息到一个对象
3.public int Msg { get; set; }
Gets or sets the ID number for the message.
4.public IntPtr Result { get; set; }
Specifies the value that is returned to Windows in response to handling the message.
5.public IntPtr WParam { get; set; }
Gets or sets the WParam field of the message.
ReMarks:
The value of this field depends on the message. Use the WParam field to get information that is important to handling the message.
This field is typically used to store small pieces of information, such as flags.
此属性通常用来存放小块的信息，例如标志位