C# 控制窗体系统菜单

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime;
using System.Runtime.InteropServices;

namespace CustomerBrowser
{
public class nosystemmenuexception : System.Exception
{}

//这些值来自于msdn

public enum itemflags
{
　 // the item ...
　 mfunchecked = 0x00000000, // ... is not checked
　 mfstring = 0x00000000, // ... contains a string as label
　 mfdisabled = 0x00000002, // ... is disabled
　 mfgrayed = 0x00000001, // ... is grayed
　 mfchecked = 0x00000008, // ... is checked
　 mfpopup = 0x00000010, // ... is a popup menu. pass the

　 // menu handle of the popup
　 // menu into the id parameter.

　 mfbarbreak = 0x00000020, // ... is a bar break
　 mfbreak = 0x00000040, // ... is a break
　 mfbyposition = 0x00000400, // ... is identified by the position
　 mfbycommand = 0x00000000, // ... is identified by its id
　 mfseparator = 0x00000800 // ... is a seperator (string and

　 // id parameters are ignored).
}

public enum windowmessages
{
　 wmsyscommand = 0x0112
}

//
/// 帮助实现操作系统菜单的类的定义
///.

//注意：用p/invoke调用动态链接库中非托管函数时，应执行如下步骤：
//1，定位包含该函数的dll。
//2，把该dll库装载入内存。
//3，找到即将调用的函数地址，并将所有的现场压入堆栈。
//4，调用函数。
//

public class systemmenu
{
　 // 提示：c＃把函数声明为外部的，而且使用属性dllimport来指定dll
　 //和任何其他可能需要的参数。
　 // 首先，我们需要getsystemmenu() 函数
　 // 注意这个函数没有unicode 版本

[DllImport("user32", EntryPoint = "GetSystemMenu", SetLastError = true,
CharSet=CharSet.Unicode , ExactSpelling=true,
CallingConvention = CallingConvention.Winapi)]

private static extern IntPtr apiGetSystemMenu(IntPtr windowhandle, int breset);
　 // 还需要appendmenu()。既然 .net 使用unicode,
　 // 我们应该选取它的unicode版本。

[DllImport("user32", EntryPoint = "AppendMenuW", SetLastError = true,
CharSet = CharSet.Unicode, ExactSpelling = true,
　 CallingConvention=CallingConvention.Winapi )]

private static extern int apiAppendMenu(IntPtr menuhandle, int flags, int newid, string item);

　 //还可能需要insertmenu()

[DllImport("user32", EntryPoint = "InsertMenuW", SetLastError = true,
CharSet=CharSet.Unicode , ExactSpelling=true,
CallingConvention=CallingConvention.Winapi )]

private static extern int apiInsertMenu(IntPtr hmenu, int position, int flags, int newid, string item);
private IntPtr m_sysmenu = IntPtr.Zero ; // 系统菜单句柄

public systemmenu( )
{}

// 在给定的位置（以0为索引开始值）插入一个分隔条

public bool insertseparator ( int pos )
{
　 return ( insertmenu(pos, itemflags.mfseparator |itemflags.mfbyposition, 0, "") );
}

// 简化的insertmenu()，前提――pos参数是一个0开头的相对索引位置

public bool insertmenu ( int pos, int id, string item )
{
　 return ( insertmenu(pos, itemflags.mfbyposition |itemflags.mfstring, id, item) );
}

// 在给定位置插入一个菜单项。具体插入的位置取决于flags

public bool insertmenu ( int pos, itemflags flags, int id, string item )
{
return (apiInsertMenu(m_sysmenu, pos, (Int32)flags, id, item) == 0);
}

// 添加一个分隔条

public bool appendseparator ( )
{
　 return appendmenu(0, "", itemflags.mfseparator);
}

// 使用itemflags.mfstring 作为缺省值

public bool appendmenu ( int id, string item )
{
　 return appendmenu(id, item, itemflags.mfstring);
}

// 被取代的函数

public bool appendmenu ( int id, string item, itemflags flags )
{
　 return ( apiAppendMenu(m_sysmenu, (int)flags, id, item) == 0 );
}

//从一个form对象检索一个新对象

public static systemmenu fromform ( Form frm )
{
　 systemmenu csysmenu = new systemmenu();
　 csysmenu.m_sysmenu = apiGetSystemMenu(frm.Handle , 0);
　 if ( csysmenu.m_sysmenu == IntPtr.Zero )
　 { // 一旦失败，引发一个异常
　　 throw new nosystemmenuexception();
　 }
　 return csysmenu;
}

// 当前窗口菜单还原
public static void resetsystemmenu ( Form frm )
{
　 apiGetSystemMenu(frm.Handle , 1);
}

// 检查是否一个给定的id在系统菜单id范围之内
public static bool verifyitemid ( int id )
{
　 return (bool)( id < 0xf000 && id > 0 );
}
}
}

调用systemmenu类

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime;
using System.Runtime.InteropServices;

namespace CustomerBrowser
{
public partial class Form1 : Form
{
// systemmenu 对象

private systemmenu m_systemmenu = null;

// id 常数定义

private const int m_ShangHaiID = 0x100;
private const int m_JapanID = 0x102;
private const int m_TopMostID = 0x103;

private const int m_resetid = 0x101;

private const string strShangHaiURL = "http://192.168.10.253/ImageViewer?Direction=&Resolution=640x480&Quality=Standard&Size=STD&PresetOperation=Move&Data=0&Frame2=PanTilt&Type=&Language=1&RPeriod=65535&Sound=Enable&Mode=JPEG&SendMethod=1&View=Full";
private const string strJapanURL = "http://203.141.137.185:50080/ImageViewer?Direction=&Resolution=320x240&Quality=Standard&Size=STD&PresetOperation=Move&Data=0&Frame2=PanTilt&Type=&Language=1&RPeriod=3&Sound=Enable&Mode=JPEG&SendMethod=1&View=Full";

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
try
{

m_systemmenu = systemmenu.fromform(this);

// 添加一个separator ...

m_systemmenu.appendseparator();

m_systemmenu.appendmenu(m_ShangHaiID, "上海");
m_systemmenu.appendmenu(m_JapanID, "日本");
m_systemmenu.appendmenu(m_TopMostID, "置顶");

//// 在菜单顶部加上"复位"菜单项

//m_systemmenu.insertseparator(0);

//m_systemmenu.insertmenu(0, m_resetid, "复位系统菜单");

}

catch (nosystemmenuexception /* err */ )
{

// 建立你的错误处理器

}
//this.webBrowser1.Navigate("http://192.168.10.253/ImageViewer?Direction=&Resolution=640x480&Quality=Standard&Size=STD&PresetOperation=Move&Data=0&Frame2=PanTilt&Type=&Language=1&RPeriod=65535&Sound=Enable&Mode=JPEG&SendMethod=1&View=Full");
}

//protected override void wndproc(ref Message msg)
//{
// base.wndproc(ref msg);
//}

protected override void WndProc(ref Message msg)
{
// 通过截取wm_syscommand消息并进行处理
// 注意，消息wm_syscommand被定义在windowmessages枚举类中
// 消息的wparam参数包含点击的项的id
// 该值与通过上面类的insertmenu()或appendmenu()成员函数传递的一样

if (msg.Msg == (int)windowmessages.wmsyscommand)
{
switch (msg.WParam.ToInt32())
{
//case m_resetid: // reset菜单项的id
// {
// if (MessageBox.Show(this, "/tare you sure?", "question", MessageBoxButtons.YesNo) ==
// DialogResult.Yes)
// { // 复位系统菜单
// systemmenu.resetsystemmenu(this);
// }
// } break;
case m_ShangHaiID:
NaviURL(strShangHaiURL);
break;
case m_JapanID:
NaviURL(strJapanURL);
break;
case m_TopMostID:
this.TopMost = !this.TopMost;
break;
}
}
// 调用基类函数
base.WndProc(ref msg);
}

private void NaviURL(string strURL)
{
this.webBrowser1.Navigate(strURL);
}
}
}

C# 控制窗体系统菜单

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