0x00000010

\program Files\Microsoft Visual Studio. Net\vc7\platformsdk\include. To find these constants, I performed a findstr in the directory. Findstr "Mb_iconhand" *.h It determines that the constants are in Winuser.h, and then I use these constants to create my enum and prototype: public enum Beeptype{Simplebeep =-1,Iconasterisk = 0x00000040,Iconexclamation = 0x00000030,Iconhand = 0x00000010,Iconquestion = 0x00000020,Ok = 0x00000000,} [DllImport ("user

hthumbnail); [DllImport ("Dwmapi.dll", PreserveSig = False)]public static extern void Dwmupdatethumbnailproperties (IntPtr hthumbnail, dwm_thumbnail_properties props); [DllImport ("Dwmapi.dll", PreserveSig = False)]public static extern void Dwmquerythumbnailsourcesize (IntPtr hthumbnail, out size size); [StructLayout (LayoutKind.Sequential)]public class Dwm_thumbnail_properties{public UINT dwflags;Public RECT rcdestination;Public RECT Rcsource;public byte opacity;[MarshalAs (Unmanagedtype.bool)

se_privilege_enabled = 0x00000002;Private Const int token_query = 0x00000008;Private Const int token_adjust_privileges = 0x00000020;Private Const string se_shutdown_name = "SeShutdownPrivilege";Private Const int ewx_logoff = 0x00000000;Private Const int ewx_shutdown = 0x00000001;Private Const int ewx_reboot = 0x00000002;Private Const int ewx_force = 0x00000004;Private Const int ewx_poweroff = 0x00000008;Private Const int Ewx_forceifhung = 0x00000010;

; Using System.ComponentModel; Sealed class sound{public static void MessageBeep (Beeptypes type) { if (! MessageBeep ((UInt32) type)) { Int32 err = Marshal.GetLastWin32Error (); throw new Win32Exception (err); } [DllImport ("User32.dll", Setlasterror=true)] static extern Boolean MessageBeep (UInt32 beeptype); Private Sound () {} } enum beeptypes{simple =-1, Ok = 0x00000000, iconhand =

the ID of the item before the new entry is inserted; If you specify Mfbyposition, the "pos" argument is the relative position of the new item that starts with a 0 index If it is-1 and specifies Mfbyposition, the item will be inserted at the end. This is why AppendMenu () can be replaced by InsertMenu (). 　　 Four, Systemmenu class code AnalysisUsing System;Using System.Windows.Forms;Using System.Diagnostics;Using System.Runtime.InteropServices;public class NoSystemMenuException:System.Exceptio