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Add RtActivatable::can_be_registered method #87

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Add RtActivatable::can_be_registered method #87

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36 changes: 29 additions & 7 deletions src/rt/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -136,10 +136,16 @@ pub trait RtNamedClass {
fn name() -> &'static [u16];
}

#[derive(Clone, Copy, Debug, PartialEq)]
pub enum RegistrationStatus {
Ok,
NotRegistered,
Error(u32),
}

pub trait RtActivatable<Interface> : RtNamedClass {
/// Returns a factory object to create instances of this class or to call static methods.
#[inline]
fn get_activation_factory() -> Interface where Interface: RtInterface + ComIid + RtType, Interface: RtType<Abi=*mut <Interface as ComInterface>::TAbi> {
fn can_be_registered() -> RegistrationStatus {
let mut res: <Interface as RtType>::Abi = unsafe { <Interface as RtType>::uninitialized() };
let class_id = unsafe { HStringReference::from_utf16_unchecked(Self::name()) };
let mut hr = unsafe { RoGetActivationFactory(class_id.get(), <Interface as ComIid>::iid().as_ref(), &mut res as *mut *mut _ as *mut *mut VOID) };
Expand All @@ -149,13 +155,29 @@ pub trait RtActivatable<Interface> : RtNamedClass {
hr = unsafe { RoGetActivationFactory(class_id.get(), <Interface as ComIid>::iid().as_ref(), &mut res as *mut *mut _ as *mut *mut VOID) };
}
if hr == S_OK {
unsafe { <Interface as RtType>::wrap_nonnull(res) }
RegistrationStatus::Ok
} else if hr == REGDB_E_CLASSNOTREG {
let name = Self::name();
panic!("WinRT class \"{}\" not registered", String::from_utf16_lossy(&name[0..name.len()-1]))
RegistrationStatus::NotRegistered
} else {
panic!("RoGetActivationFactory failed with error code 0x{:X}", hr as u32)
}
RegistrationStatus::Error(hr as u32)
}
}

/// Returns a factory object to create instances of this class or to call static methods.
#[inline]
fn get_activation_factory() -> Interface where Interface: RtInterface + ComIid + RtType, Interface: RtType<Abi=*mut <Interface as ComInterface>::TAbi> {
match RtActivatable::can_be_registered() {
RegistrationStatus::Ok => {
unsafe { <Interface as RtType>::wrap_nonnull(RoGetActivationFactory(class_id.get(), <Interface as ComIid>::iid().as_ref(), &mut res as *mut *mut _ as *mut *mut VOID)) };
}
RegistrationStatus::NotRegistered => {
let name = Self::name();
panic!("WinRT class \"{}\" not registered", String::from_utf16_lossy(&name[0..name.len()-1]))
}
RegistrationStatus::Error(hr) => {
panic!("RoGetActivationFactory failed with error code 0x{:X}", hr)
}
}
}
}

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