这段代码为什么不能将菜单变灰？？？

[liang13144]

void CMainFrame::OnMenuitem32773()
{
// TODO: Add your command handler code here
CMenu* pMenu = GetMenu();
int i = pMenu->GetMenuItemCount();
CMenu* pSubMenu = pMenu->GetSubMenu(4);
i = pSubMenu->GetMenuItemCount();
i = pSubMenu->EnableMenuItem(1,MF_BYPOSITION | MF_GRAYED );
}

[alphagx]

再加一个 MF_DISABLED

[liang13144]

还是不行呀！！！！！！

[liang13144]

helping !!!!!!!

[alphagx]

在CMainFrame 初始化时，把
bAutoMenuEnable =FALSE

[liang13144]

在说明白点啊，bAutoMenuEnable 不是成员变量呀

[alphagx]

你可以看一下MSDN中
CMenu::EnableMenuItem你就知道了，
// The code fragment below shows how to disable (and gray out) the
// File\New menu item.
// NOTE: m_bAutoMenuEnable is set to FALSE in the constructor of
// CMainFrame so no ON_UPDATE_COMMAND_UI or ON_COMMAND handlers are
// needed, and CMenu::EnableMenuItem() will work as expected.

CMenu* mmenu = GetMenu();
CMenu* submenu = mmenu->GetSubMenu(0);
submenu->EnableMenuItem(ID_FILE_NEW, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

[alphagx]

m_bAutoMenuEnable 是CFrameWnd
的成员变量，
而CMainFrame是从CFrameWnd派生的。

[stevenW]

楼上兄弟说的很正确

[liang13144]

还是 不行呀 ！！！！！

[alphagx]

你是让主菜单的第五个子菜单下面第二个子菜单无效吗？？

[liang13144]

我先
CMainFrame::CMainFrame()
{
// TODO: add member initialization code here
this->m_bAutoMenuEnable = FALSE;
}
然后
void CMainFrame::OnMenuitem32773()
{
// TODO: Add your command handler code here
CMenu* pMenu = GetMenu();
int i = pMenu->GetMenuItemCount();
CMenu* pSubMenu = pMenu->GetSubMenu(4);
i = pSubMenu->GetMenuItemCount();
i = pSubMenu->EnableMenuItem(1,MF_BYPOSITION ¦ MF_GRAYED );
}
还是不能将自己添加的菜单变灰呀

[stevenW]

1.在CMainFrame的构造函数里bAutoMenuEnable =FALSE
2.CMenu* mmenu = GetMenu();
CMenu* submenu = mmenu->GetSubMenu(0);
submenu->EnableMenuItem(ID_FILE_NEW, MF_BYCOMMAND ¦ MF_DISABLED ¦ MF_GRAYED);
3.ok了give me scores

[alphagx]

MF_BYCOMMAND ¦ MF_DISABLED ¦ MF_GRAYED;

你忘记加MF_DISABLED!!

[liang13144]

怎么给你分呀？？？我搞好了
多谢
就卡在那个m_bAutoMenuEnable变量上了

[stevenW]

不用加MF_DISABLED
0.
增加自己的菜单
1.

CMainFrame::CMainFrame()
{
// TODO: add member initialization code here
m_bAutoMenuEnable =FALSE;
}
2.
void CMainFrame::OnTest()
{
// TODO: Add your command handler code here

CMenu* mmenu = GetMenu();
CMenu* submenu = mmenu->GetSubMenu(4);
submenu->EnableMenuItem(ID_TEST, MF_BYCOMMAND | MF_GRAYED);


}