UINT_PTR numbers among a program's identifiers..

[dnarcistrinca]

Hello,

I have a simple question regarding the UINT_PTR passed as parameter to a InsertMenu function as in

HMENU hM1;
hM1 = GetMenu(hWnd);

HMENU hM2;

hM2 = CreateMenu();
InsertMenu(hM1, 0, MF_POPUP | MF_BYPOSITION, UINT_PTR(hM2), TEXT("Item 1"));

hM2 = CreateMenu();
InsertMenu(hM1, 1, MF_POPUP | MF_BYPOSITION, UINT_PTR(hM2), TEXT("Item 2"));

The question is if there is any guarantee that the UINT_PTR(hM2) will be unique among the menu's all identifiers, and also among programs's all identifiers..Suppose that the program also has a button identifier

#define ID_BUTTON1 15

Is there any guarantee that some UINT_PTR(hM2) will not be 15 ?


Best,
D Narcis

[Arjay]

A menu handle (e.g. hM1) is different from a menu ID constant, but there is no guarantee that the values could be the same.

[dnarcistrinca]

Ok, so it should be avoided even for popup menu items, because it might interfere with other identifiers when processing the WM_COMMAND message..

[Arjay]

Ok, so it should be avoided even for popup menu items, because it might interfere with other identifiers when processing the WM_COMMAND message..

There is a range of user IDs that you should use. I'm on a phone now so I can't look this up for you.