how to gray a menuitem

Hi,

I have a menu with menuitems in a resource.rc file. I load the menu thru the RegisterClassEx and I use the message system thru a callback procedure. I know how to handle messages sent from clicking on a menu item. Yet, I'd like to know ho to gray a menu item by using the SendMessage() function.

thanks

You can use ::EnableMenuItem().

Cheers

Ok, but I have some difficulties understanding how to go about using it, the function is:

Code:

---

BOOL EnableMenuItem(     
        HMENU hMenu,
        UINT uIDEnableItem,
        UINT uEnable
);

---

Now, I have the menu defined in an .rc and .h files like the following:

Code:

---

//resource.h
#define IDM_MENU      200
#define IDM_FILE_START 201
#define IDM_FILE_STOP  202

//resource.rc
#include "resource.h"

IDM_MENU MENU DISCARDABLE
BEGIN
        POPUP "&File"
        BEGIN
                MENUITEM "Start thread...", IDM_FILE_START
                MENUITEM "Stop thread...", IDM_FILE_STOP
        END
END

---

The menu is loaded into the main window thru the WNDCLASS:

Code:

---

.lpszMenuName = MAKEINTRESOURCE(IDM_MENU);

---

and I capture the system messages by using the classic window callback:

Code:

---

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
        switch(message)
        {
                case WM_COMMAND:
                        switch(LOWORD(wParam))
                        {
                                case IDM_FILE_START:
                                (...)
                                break;

                                case IDM_FILE_STOP:
                                (...)
                                break;
                        }
                        break;

                default:
                return DefWindowProc(hwnd, Message, wParam, lParam);
        }
        return 0;
}

---

Now when I get the IDM_FILE_START wParam thru the WM_COMMAND message how can I disable the IDM_FILE_START menuitem by using the EnableMenuItem() function?

thanks

Try to handle WM_INITMENUPOPUP message, if WPARAM is your menu handle - then enable or disable IDM_FILE_START using EnableMenuItem (passing menu handle and menu item ID to it)