MENUITEMINFO (Compact 2013)

项目
04/19/2017

3/28/2014

This structure contains information about a menu item.

Syntax

typedef struct tagMENUITEMINFO {
  UINT cbSize; 
  UINT fMask; 
  UINT fType; 
  UINT fState; 
  UINT wID; 
  HMENU hSubMenu; 
  HBITMAP hbmpChecked; 
  HBITMAP hbmpUnchecked; 
  DWORD dwItemData; 
  LPTSTR dwTypeData; 
  UINT cch; 
} MENUITEMINFO, FAR* LPMENUITEMINFO;

Members

cbSize
Size of structure, in bytes. The caller must set this to sizeof(MENUITEMINFO).

fMask
Members to retrieve or set. It can be one or more of these values.

Value	Description
MIIM_CHECKMARKS	Retrieves or sets the hbmpChecked and hbmpUnchecked members.
MIIM_DATA	Retrieves or sets the dwItemData member.
MIIM_ID	Retrieves or sets the wID member.
MIIM_STATE	Retrieves or sets the fState member.
MIIM_SUBMENU	Retrieves or sets the hSubMenu member.
MIIM_TYPE	Retrieves or sets the fType and dwTypeData members.
MIIM_FULLSTR	Modifies the MIIM_TYPE flag to retrieve a complete string, including prefix characters, when paired with menu items of type MFT_STRING.

fType
Menu item type. It can be one or more of these values.

Value	Description
MFT_MENUBARBREAK	Places the menu item on a new line (for a menu bar) or in a new column (for a drop-down menu, submenu, or shortcut menu). For a drop-down menu, submenu, or shortcut menu, a vertical line separates the new column from the old.
MFT_MENUBREAK	Places the menu item on a new line (for a menu bar) or in a new column (for a drop-down menu, submenu, or shortcut menu). For a drop-down menu, submenu, or shortcut menu, the columns are not separated by a vertical line.
MFT_OWNERDRAW	Assigns responsibility for drawing the menu item to the window that owns the menu. The window receives a WM_MEASUREITEM message before the menu is displayed for the first time, and a WM_DRAWITEM message whenever the appearance of the menu item must be updated. If this value is specified, the dwTypeData member contains an application-defined 32-bit value.
MFT_RADIOCHECK	Displays checked menu items using a radio-button mark instead of a check mark if the hbmpChecked member is NULL.
MFT_SEPARATOR	Specifies that the menu item is a separator. A menu item separator appears as a horizontal dividing line. The dwTypeData and cch members are ignored. This value is valid only in a drop-down menu, submenu, or shortcut menu.
MFT_STRING	Displays the menu item using a text string. The dwTypeData member is the pointer to a null-terminated string, and the cch member is the length of the string.

The MFT_SEPARATOR and MFT_STRING values cannot be combined with one another.

fState
Menu item state. It can be one or more of these values.

Value	Description
MFS_CHECKED	Checks the menu item. For more information about checked menu items, see the hbmpChecked member.
MFS_DEFAULT	Specifies that the menu item is selected by default when the menu is launched.
MFS_ENABLED	Enables the menu item so that it can be selected. This is the default state.
MFS_GRAYED	Disables the menu item and grays it so that it cannot be selected.
MFS_HILITE	Highlights the menu item.
MFS_UNCHECKED	Unchecks the menu item. For more information about unchecked menu items, see the hbmpUnchecked member.
MFS_UNHILITE	Removes the highlight from the menu item. This is the default state.

wID
Application-defined 16-bit value that identifies the menu item.

hSubMenu
Handle to the drop-down menu or submenu associated with the menu item. If the menu item is not an item that opens a drop-down menu or submenu, this member is NULL.

hbmpChecked
Handle to the bitmap to display next to the item if it is checked. If this member is NULL, a default bitmap is used. If the MFT_RADIOCHECK type value is specified, the default bitmap is a bullet. Otherwise, it is a check mark.

hbmpUnchecked
Handle to the bitmap to display next to the item if it is not checked. If this member is NULL, no bitmap is used.

dwItemData
Specifies the application-defined value associated with the menu item.

dwTypeData
Specifies the content of the menu item. This member is used only if the MIIM_TYPE flag is set in the fMask member.

Before calling GetMenuItemInfo, the application must set this member to point to a buffer whose length is specified by the cch member. If the retrieved menu item is of the type MFT_STRING, then GetMenuItemInfo copies the menu item text to the buffer. If the MIIM_FULLSTR flag is set in conjunction with the MIIM_TYPE flag and the menu item is of the type MFT_STRING, then GetMenuItemInfo will retrieve the complete text, including prefix characters. If the retrieved menu item is of some other type, then GetMenuItemInfo sets the dwTypeData member to a value whose type is specified by the fType member. The MIIM_FULLSTR flag does not affect menu items which are not of type MFT_STRING.

When using with the SetMenuItemInfo function, this member should contain a value whose type is specified by the fType member.

cch
Length of the menu item text when information is received about a menu item of the MFT_STRING type. This member is used only if the MIIM_TYPE flag is set in the fMask member and is zero otherwise. This member is ignored when the content of a menu item is set by calling SetMenuItemInfo.

Before calling GetMenuItemInfo, the application must set this member to the length of the buffer pointed to by the dwTypeData member. If the retrieved menu item is of type MFT_STRING (as indicated by the fType member), then GetMenuItemInfo sets cch to the length of the retrieved string. If the retrieved menu item is of some other type, GetMenuItemInfo sets the cch member to zero.

Remarks

The MENUITEMINFO structure is used with the GetMenuItemInfo and SetMenuItemInfo functions. See the documentation for these functions to determine which members of MENUITEMINFO are supported for each operation.

Requirements

Header

winuser.h

通过

MENUITEMINFO (Compact 2013)

Syntax

Members

Remarks

Requirements

See Also

Reference

其他资源