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GirkovArpa
Asked: 2022-04-06 22:45:44 +0800 CST 2022-04-06 22:45:44 +0800 CST

How to know if a menu has been clicked?

  • 772

I am using crate winsafeand I want to know when a menu has been clicked.

flags & MF_MOUSESELECT as u16It should be 1when yes and 0when no, but it always is 32768.

Why?

self.wnd.on().wm(winsafe::co::WM::MENUSELECT, {
  move |params| {
    let wparam = params.wparam;
    let lparam = params.lparam;
    let flags = (wparam >> 16 & 0xffff) as u16;
    let MF_MOUSESELECT = 0x00008000 as u32;
    
    println!("{}", flags & MF_MOUSESELECT as u16);
    // siempre 32768

    0
  }
});
windows

1 Answers

  1. Best Answer

    According to https://docs.microsoft.com/en-us/windows/win32/menurc/wm-menuselect , WM_MENUSELECT( winsafe::co::MF::MOUSESELECT) is defined as 0x00008000L, which is equal to 32768.

    If you really need 0or 1, you can use it (flags & MF_MENUSELECT) >> MF_MENUSELECT.trailing_zeros()( it trailing_zerosmeans "zero bits at the end", and >>it removes the same number of bits from the flag value).

    If you only need falseor truefor a conditional, you can use flags & MF_MENUSELECT != 0.

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