Page 183 - DCAP408_WEB_PROGRAMMING

Unit 10: Menus

using System.Windows.Forms; Notes
using System.Data;
using System.Runtime.InteropServices;
.........
#region API Declarations
// return the handle for the system menu
[DllImport (“user32.dll”)]
public static extern int GetSystemMenu(int hwnd, bool bRevert);
// append a menu item to the menu
[DllImport (“user32.dll”, EntryPoint=“AppendMenuA”)]
public static extern long AppendMenu(int hMenu, int
wFlags, int wIDNewItem, string lpNewItem);
// remove a menu item from the menu
[DllImport (“user32.dll”)]
public static extern long RemoveMenu(int hMenu, int
nPosition, int wFlags);
#endregion // API Declarations
// constants
private const int MF_BYPOSITION = 1024;
private const int MF_SEPERATOR = 2048;
private const int MF_REMOVE = 4096;
private const int WM_SYSCOMMAND = 274;
#region System Menu API
/// <summary>
/// Returns the handle for the System Menu with the
associate form
/// </summary>
/// <param name=”frmHandle”>The handle to the form to retrieve
the menu handle</param>
public int GetSysMenuHandle(int frmHandle)
{
return GetSystemMenu(frmHandle, false);
}
/// <summary>
/// Removes a system menu
/// </summary>
/// <param name=”mnuHandle”>Then handle to the system menu.
Use GetSysMenuHandle</param>
/// <param name=”mnuPosition”>Zero based position of the
menu item to delete</param>
/// <returns>returns nonzero on success, returns 0 on fail</
returns>
public long RemoveSysMenu(int mnuHandle, int mnuPosition)

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