Question

我试图知道menuItem是否被禁用或启用，但我得到了1456 - “未找到菜单项” 我做错了什么

第一部分中的

是win32库的声明。

menuIndex是一个参数int submenuIndex是另一个参数int

    [StructLayout(LayoutKind.Sequential)]
    struct MENUITEMINFO
    {
        public uint cbSize;
        public uint fMask;
        public uint fType;
        public uint fState;
        public uint wID;
        public IntPtr hSubMenu;
        public IntPtr hbmpChecked;
        public IntPtr hbmpUnchecked;
        public IntPtr dwItemData;
        public string dwTypeData;
        public uint cch;
        public IntPtr hbmpItem;

        // return the size of the structure
        public static uint sizeOf
        {
            get { return (uint)Marshal.SizeOf(typeof(MENUITEMINFO)); }
        }
    }

[DllImport("user32.dll")]
private static extern IntPtr GetMenu(IntPtr hWnd);

[DllImport("user32.dll")]
private static extern IntPtr GetSubMenu(IntPtr hMenu, int nPos);

[DllImport("user32.dll")]
private static extern uint GetMenuItemID(IntPtr hMenu, int nPos);

[DllImport("user32.dll", SetLastError = true)]
private static extern bool GetMenuItemInfo(IntPtr hMenu, int uItem, bool fByPosition, ref MENUITEMINFO lpmii);

....

IntPtr menu = GetMenu(handle);

IntPtr subMenu = GetSubMenu(menu, menuIndex);

uint menuItemID = GetMenuItemID(subMenu, submenuIndex);

MENUITEMINFO itemInfo = new MENUITEMINFO();
uint MIIM_STATE = 0x00000001;
itemInfo.cbSize = MENUITEMINFO.sizeOf;
itemInfo.fMask = MIIM_STATE;

if (!GetMenuItemInfo(menu, (int)submenuIndex, false, ref itemInfo))
{
    uint erro = GetLastError();
    //erro = 1456
    throw new Exception("Ocorreu um erro ao obter informações do Menu Centura - Cod: "+Marshal.GetLastWin32Error().ToString() +"\n http://msdn.microsoft.com/en-us/library/windows/desktop/ms681381(v=vs.85).aspx");
}                    

if (itemInfo.fState == MFS_DISABLED)
    throw new Exception("Disabled");

PostMessage(handle, 0x0111, (IntPtr)menuItemID, IntPtr.Zero);

Answer 1

您正在为false参数传递fByPosition，因此您需要传递菜单ID（menuItemID），而不是索引（submenuIndex）。您还需要将句柄传递给包含该项目的菜单（subMenu，而不是menu）。

The documentation说

fByPosition [in]

输入：BOOL

uItem的含义。如果此参数为FALSE，则uItem是菜单项标识符。否则，它是菜单项位置。有关详细信息，请参阅Accessing Menu Items Programmatically。

其中任何一个都可行：

GetMenuItemInfo(subMenu, (int)submenuIndex, true, ref itemInfo)

GetMenuItemInfo(subMenu, (int)menuItemID, false, ref itemInfo)

GetMenuItemInfo，但我得到了1456 - “未找到菜单项”

1 个答案: