enablemenuitem 让菜单有效

导读 大家好,让菜小思来为大家解答以上的问题。enablemenuitem 让菜单有效这个很多人还不知道,让菜现在让我们一起来看看吧！1、让菜用这个函数试EnableMenuI 大家好,让菜小思来为大家解答以上的问题。enablemenuitem 让菜单有效这个很多人还不知道,让菜现在让我们一起来看看吧！1、让菜用这个函数试EnableMenuItem看看用法CMenu::EnableMenuItem UINT EnableMenuItem( UINT nIDEnableItem,让菜 UINT nEnable );Return ValuePrevious state (MF_DISABLED, MF_ENABLED, or MF_GRAYED) or –1 if not valid.ParametersnIDEnableItemSpecifies the menu item to be enabled, as determined by nEnable. This parameter can specify pop-up menu items as well as standard menu items.nEnableSpecifies the action to take. It can be a combination of MF_DISABLED, MF_ENABLED, or MF_GRAYED, with MF_BYCOMMAND or MF_BYPOSITION. These values can be combined by using the bitwise OR operator. These values have the following meanings: MF_BYCOMMAND Specifies that the parameter gives the command ID of the existing menu item. This is the default.MF_BYPOSITION Specifies that the parameter gives the position of the existing menu item. The first item is at position 0.MF_DISABLED Disables the menu item so that it cannot be selected but does not dim it.MF_ENABLED Enables the menu item so that it can be selected and restores it from its dimmed state.MF_GRAYED Disables the menu item so that it cannot be selected and dims it. RemarksEnables, disables, or dims a menu item. The CreateMenu, InsertMenu, ModifyMenu, and LoadMenuIndirect member functions can also set the state (enabled, disabled, or dimmed) of a menu item.Using the MF_BYPOSITION value requires an application to use the correct CMenu. If the CMenu of the menu bar is used, a top-level menu item (an item in the menu bar) is affected. To set the state of an item in a pop-up or nested pop-up menu by position, an application must specify the CMenu of the pop-up menu. When an application specifies the MF_BYCOMMAND flag, Windows checks all pop-up menu items that are subordinate to the CMenu; therefore, unless duplicate menu items are present, using the CMenu of the menu bar is sufficient.。本文到此分享完毕，让菜希望对大家有所帮助。让菜让菜

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