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#![allow(non_camel_case_types, non_snake_case)]
use crate::co;
use crate::decl::*;
use crate::dshow::iterators::*;
use crate::kernel::ffi_types::*;
use crate::ole::privs::*;
use crate::prelude::*;
use crate::vt::*;
/// [`IEnumPins`](crate::IEnumPins) virtual table.
#[repr(C)]
pub struct IEnumPinsVT {
pub IUnknownVT: IUnknownVT,
pub Next: fn(COMPTR, u32, *mut COMPTR, *mut u32) -> HRES,
pub Skip: fn(COMPTR, u32) -> HRES,
pub Reset: fn(COMPTR) -> HRES,
pub Clone: fn(COMPTR, *mut COMPTR) -> HRES,
}
com_interface! { IEnumPins: "56a86893-0ad4-11ce-b03a-0020af0ba770";
/// [`IEnumPins`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nn-strmif-ienumpins)
/// COM interface over [`IEnumPinsVT`](crate::vt::IEnumPinsVT).
///
/// Automatically calls
/// [`IUnknown::Release`](https://learn.microsoft.com/en-us/windows/win32/api/unknwn/nf-unknwn-iunknown-release)
/// when the object goes out of scope.
}
impl dshow_IEnumPins for IEnumPins {}
/// This trait is enabled with the `dshow` feature, and provides methods for
/// [`IEnumPins`](crate::IEnumPins).
///
/// Prefer importing this trait through the prelude:
///
/// ```no_run
/// use winsafe::prelude::*;
/// ```
pub trait dshow_IEnumPins: ole_IUnknown {
/// Returns an iterator over the [`IPin`](crate::IPin) elements which calls
/// [`IEnumPins::Next`](crate::prelude::dshow_IEnumPins::Next) internally.
///
/// # Examples
///
/// ```no_run
/// use winsafe::{self as w, prelude::*};
///
/// let pins: w::IEnumPins; // initialized somewhere
/// # let pins = unsafe { w::IEnumPins::null() };
///
/// for pin in pins.iter() {
/// let pin = pin?;
/// // ...
/// }
/// # w::HrResult::Ok(())
/// ```
#[must_use]
fn iter(&self) -> impl Iterator<Item = HrResult<IPin>> + '_ {
IenumpinsIter::new(self)
}
/// [`IEnumPins::Next`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-ienumpins-next)
/// method.
///
/// Prefer using
/// [`IEnumPins::iter`](crate::prelude::dshow_IEnumPins::iter), which
/// is simpler.
#[must_use]
fn Next(&self) -> HrResult<Option<IPin>> {
let mut queried = unsafe { IPin::null() };
let mut fetched = u32::default();
match ok_to_hrresult(
unsafe {
(vt::<IEnumPinsVT>(self).Next)(
self.ptr(),
1, // retrieve only 1
queried.as_mut(),
&mut fetched,
)
},
) {
Ok(_) => Ok(Some(queried)),
Err(hr) => match hr {
co::HRESULT::S_FALSE => Ok(None), // no pin found
hr => Err(hr), // actual error
},
}
}
fn_com_noparm! { Reset: IEnumPinsVT;
/// [`IEnumPins::Reset`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-ienumpins-reset)
/// method.
}
/// [`IEnumPins::Skip`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-ienumpins-skip)
/// method.
fn Skip(&self, count: u32) -> HrResult<bool> {
okfalse_to_hrresult(
unsafe { (vt::<IEnumPinsVT>(self).Skip)(self.ptr(), count) },
)
}
}