How to get menu ID from HMENU? - c++

Question

I'm trying to override WM_HELP message for my dialog window when a user presses F1 key. The window has several buttons that display context menus via TrackPopupMenu, as well as the main menu (on top.) So there's more than just one menu in this window.
I can trap menu message as such when processing WM_HELP, but I need to know which context menu sent this message:
BOOL CMyDialog::OnHelpInfo(HELPINFO* pHelpInfo)
{
if(pHelpInfo->iContextType == HELPINFO_MENUITEM)
{
HMENU hMenu = (HMENU)pHelpInfo->hItemHandle;
//How to get menu ID from HMENU?
}
//...
}
So I need to find a way to get menu resource ID from HMENU -- this one that was used to create it:
Any idea how to do it?

Answer 1

You'll have to "somewhat bruteforce" it. You can approach it from the top-down. Make a function like this:
BOOL IsMenuItemIDInMenu(UINT nMenuID, UINT nMenuItemID)
{
//Checks if 'nMenuItemID' belongs to 'nMenuID'
BOOL bRes = FALSE;
if(nMenuID &&
nMenuItemID)
{
HMENU hMenu = ::LoadMenu(GetModuleHandle(NULL), MAKEINTRESOURCE(nMenuID));
if(hMenu)
{
//Look for it
bRes = __searchForMenuItem(hMenu, nMenuItemID);
//Free menu
::DestroyMenu(hMenu);
}
}
return bRes;
}
BOOL __searchForMenuItem(HMENU hMenu, UINT nMenuItemID)
{
ASSERT(hMenu);
int nCnt = ::GetMenuItemCount(hMenu);
if(nCnt != -1)
{
for(int i = 0; i < nCnt; i++)
{
//Is it a submenu
HMENU hSubMenu = ::GetSubMenu(hMenu, i);
if(!hSubMenu)
{
UINT nID = ::GetMenuItemID(hMenu, i);
if(nID != -1 &&
nID == nMenuItemID)
{
//Found it
return TRUE;
}
}
else
{
//Process submenu
if(__searchForMenuItem(hSubMenu, nMenuItemID))
{
//Found it in submenu
return TRUE;
}
}
}
}
return FALSE;
}
And then when you get a menu ID that was highlighted when F1 was pressed, see which of your menus it belongs to:
if(pHelpInfo->iContextType == HELPINFO_MENUITEM)
{
if(IsMenuItemIDInMenu(IDR_MENU_1, pHelpInfo->iCtrlId))
{
}
else if(IsMenuItemIDInMenu(IDR_MENU_2, pHelpInfo->iCtrlId))
{
}
}