C#屏蔽ComboBox系统右键菜单介绍(通过API拦截消息)

缺乏、安全感 2022-05-17 08:07 86阅读 0赞

C\#屏蔽ComboBox系统右键菜单代码如下：

using
      
        System.Runtime.InteropServices;
    
     
    
    [DllImport(
      
       "
      
       user32.dll
      
       "
      
       )]
    
    
      
       public
      
        
      
       static
      
        
      
       extern
      
        IntPtr GetWindow(IntPtr hWnd, 
      
       uint
      
        uCmd);
    
    
      
       public
      
        
      
       const
      
        
      
       uint
      
        GW_CHILD
      
       =
      
        
      
       5
      
       ;
    
     
    
    
      
       private
      
        
      
       delegate
      
        IntPtr WndProcCallBack(IntPtr hwnd, 
      
       int
      
        Msg, 
    
        IntPtr wParam, IntPtr lParam);
    
     
    
    [DllImport(
      
       "
      
       user32.dll
      
       "
      
       )]
    
    
      
       private
      
        
      
       static
      
        
      
       extern
      
        
      
       int
      
        SetWindowLong(IntPtr hWnd, 
      
       int
      
        nIndex, 
      
       int
      
        dwNewLong);
    
    [DllImport(
      
       "
      
       user32.dll
      
       "
      
       )]
    
    
      
       private
      
        
      
       static
      
        
      
       extern
      
        
      
       int
      
        GetWindowLong(IntPtr hWnd, 
      
       int
      
        nIndex);
    
    [DllImport(
      
       "
      
       User32.dll
      
       "
      
       )]
    
    
      
       private
      
        
      
       static
      
        
      
       extern
      
        IntPtr CallWindowProc(IntPtr lpPrevWndFunc, 
    
        IntPtr hWnd, 
      
       int
      
        Msg, IntPtr wParam, IntPtr lParam);
    
    
      
       private
      
        
      
       int
      
        GWL_WNDPROC
      
       =
      
        
      
       -
      
       4
      
       ;
    
    
      
       private
      
        
      
       static
      
        IntPtr prevWndFunc;
    
    
      
       private
      
        IntPtr newWndProc(IntPtr hWnd, 
      
       int
      
        iMsg, IntPtr wParam, IntPtr lParam)
    
    {
    
        
      
       const
      
        
      
       int
      
        WM_CONTEXTMENU 
      
       =
      
        
      
       0x007B
      
       ;
    
        
      
       switch
      
        (iMsg)
    
        {
    
            
      
       case
      
        WM_CONTEXTMENU:
    
                
      
       return
      
        IntPtr.Zero;
    
        }
    
        
      
       return
      
        CallWindowProc(prevWndFunc, hWnd, iMsg, wParam, lParam);
    
    }
    
    
      
       private
      
        IntPtr comboBoxEdit;
    
    
      
       private
      
        WndProcCallBack wndProcCallBack;
    
    
      
       private
      
        
      
       void
      
        Form1_Load(
      
       object
      
        sender, EventArgs e)
    
    {
    
        comboBoxEdit 
      
       =
      
        GetWindow(comboBox1.Handle, GW_CHILD);
    
        prevWndFunc 
      
       =
      
        
      
       new
      
        IntPtr(GetWindowLong(comboBoxEdit, GWL_WNDPROC));
    
        wndProcCallBack 
      
       =
      
        
      
       new
      
        WndProcCallBack(newWndProc);
    
        SetWindowLong(comboBoxEdit, GWL_WNDPROC,
    
            (
      
       int
      
       )Marshal.GetFunctionPointerForDelegate(wndProcCallBack));
    
    }

C#创建右键菜单
     
      
     
      
      
       
       
        
       
        范例说明:本范例讲解如何创建右键菜单，重点请注意菜单控件ContextMenuStrip的使用. 
       
        关键步骤: 
       
        1.创建一个新的Windows工程。 
       
        2.把ContextMenuStrip控件拖放到设计界面上,Name属性设置为cmMenu. 
       
        3.单击ContextMenuStrip控件的Type Here文本区域，可以输入菜单项的名称,如&new,然后回车. 
       
        4.添加RichTextBox控件，设置Name属性为"rchShow". 
       
        设置Form和RichTextBox的ContextMenuStript属性为“cmMenu”。 
       
        7.双击ContextMenuStrip控件的菜单项，添加Open事件。 
       
        /// <summary>
    /// 右键菜单Open的处理事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void miOpen_Click(object sender, EventArgs e)
    {
         
    OpenFileDialog dlgOpen = new OpenFileDialog(); 
       
        dlgOpen.Filter = "文本文件(*.txt)|*.txt"; 
       
        if (dlgOpen.ShowDialog() == DialogResult.OK)
    {
         
    this.rchShow.LoadFile(dlgOpen.FileName,RichTextBoxStreamType.PlainText);
    }
    } 
       
          
       
        private void Form1_Load(object sender, EventArgs e)
    {
         
    ContextMenuStrip cms = new ContextMenuStrip();
    cms.Items.Add("第一个");
    cms.Items.Add("第二个");
    this.ContextMenuStrip = cms;
    }