以一个专家的身份告诉你： 子窗口不能有菜单。 你看一下 CreateWindowEx() 函数就应该明白，在系统维护的窗口内部结构里，菜单句柄和子窗口 ID 共用一个变量，不是子窗口时，该变量表示菜单句柄，否则为子窗口 ID。
To dandycheung(珠穆朗玛) 长见识了，明天到公司时一定看看CreateWindowEx的源码
MSDN里面讲了 CreateWindowEx The CreateWindowEx function creates an overlapped, pop-up, or child window with an extended window style; otherwise, this function is identical to the CreateWindow function. For more information about creating a window and for full descriptions of the other parameters of CreateWindowEx, see CreateWindow. HWND CreateWindowEx( DWORD dwExStyle, // extended window style LPCTSTR lpClassName, // registered class name LPCTSTR lpWindowName, // window name DWORD dwStyle, // window style int x, // horizontal position of window int y, // vertical position of window int nWidth, // window width int nHeight, // window height HWND hWndParent, // handle to parent or owner window HMENU hMenu, // menu handle or child identifier //注意这个 HINSTANCE hInstance, // handle to application instance LPVOID lpParam // window-creation data ); 下面看看解释:hMenu [in] Handle to a menu, or specifies a child-window identifier, depending on the window style. For an overlapped or pop-up window, hMenu identifies the menu to be used with the window; it can be NULL if the class menu is to be used. For a child window, hMenu specifies the child-window identifier, an integer value used by a dialog box control to notify its parent about events. The application determines the child-window identifier; it must be unique for all child windows with the same parent window.
Dialog的属性没有修改，就是说既没有改成Child，也没有指定Menu
然后再Dialog的class里加一个成员变量CMenu *m_pMenu;
在OnInitDialog里
m_pMenu = new CMenu;
m_pMenu->LoadMenu(IDR_MAINMENU);
SetMenu(m_pMenu);
就OK了
子窗口不能有菜单。
你看一下 CreateWindowEx() 函数就应该明白，在系统维护的窗口内部结构里，菜单句柄和子窗口 ID 共用一个变量，不是子窗口时，该变量表示菜单句柄，否则为子窗口 ID。
长见识了，明天到公司时一定看看CreateWindowEx的源码
CreateWindowEx
The CreateWindowEx function creates an overlapped, pop-up, or child window with an extended window style; otherwise, this function is identical to the CreateWindow function. For more information about creating a window and for full descriptions of the other parameters of CreateWindowEx, see CreateWindow. HWND CreateWindowEx(
DWORD dwExStyle, // extended window style
LPCTSTR lpClassName, // registered class name
LPCTSTR lpWindowName, // window name
DWORD dwStyle, // window style
int x, // horizontal position of window
int y, // vertical position of window
int nWidth, // window width
int nHeight, // window height
HWND hWndParent, // handle to parent or owner window
HMENU hMenu, // menu handle or child identifier //注意这个
HINSTANCE hInstance, // handle to application instance
LPVOID lpParam // window-creation data
);
下面看看解释:hMenu
[in] Handle to a menu, or specifies a child-window identifier, depending on the window style. For an overlapped or pop-up window, hMenu identifies the menu to be used with the window; it can be NULL if the class menu is to be used. For a child window, hMenu specifies the child-window identifier, an integer value used by a dialog box control to notify its parent about events. The application determines the child-window identifier; it must be unique for all child windows with the same parent window.
直接在VC中对话框的“属性”里的Menu下拉框里选择菜单ID就可以了。
看了半天WINMDI.CPP，就是没想起来看看MSDN