ON_COMMAND_RANGE

Статья
10/16/2008

Use this macro to map a contiguous range of command IDs to a single message handler function.

ON_COMMAND_RANGE(id1, id2, memberFxn )

Параметры

id1
Command ID at the beginning of a contiguous range of command IDs.
id2
Command ID at the end of a contiguous range of command IDs.
memberFxn
The name of the message-handler function to which the commands are mapped.

Заметки

The range of IDs starts with id1 and ends with id2.

Use ON_COMMAND_RANGE to map a range of command IDs to one member function. Use ON_COMMAND to map a single command to a member function. Only one message-map entry can match a given command ID. That is, you can't map a command to more than one handler. For more information on mapping message ranges, see Handlers for Message-Map Ranges.

There is no automatic support for message map ranges, so you must place the macro yourself.

Пример

// The code fragment below shows how to use ON_COMMAND_RANGE macro
// to map a contiguous range of command IDs to a single message 
// handler function (i.e. OnRangeCmds() in the sample below). In 
// addition, it also shows how to use CheckMenuRadioItem() to check a 
// selected menu item and makes it a radio item.
BEGIN_MESSAGE_MAP(CChildFrame, CMDIChildWnd)
   ON_COMMAND_RANGE(ID_COMMAND_RANGECMD1, ID_COMMAND_RANGECMD3, &CChildFrame::OnRangeCmds)
END_MESSAGE_MAP()

void CChildFrame::OnRangeCmds(UINT nID)
{
   CMenu* mmenu = AfxGetMainWnd()->GetMenu();
   CMenu* submenu = mmenu->GetSubMenu(5);
   submenu->CheckMenuRadioItem(ID_COMMAND_RANGECMD1, ID_COMMAND_RANGECMD3, 
      nID, MF_BYCOMMAND);
}