Add VT_UNKNOWN support for VARIANT and PROPVARIANT

crates/libs/core/src/error.rs

@@ -93,7 +93,7 @@ impl From<std::string::FromUtf8Error> for Error {
 
 impl From<std::num::TryFromIntError> for Error {
     fn from(_: std::num::TryFromIntError) -> Self {
-        Self { code: HRESULT(crate::imp::E_INVALIDARG), info: None }
+        Self { code: crate::imp::E_INVALIDARG, info: None }
     }
 }
 

crates/libs/core/src/imp/bindings.rs

@@ -482,7 +482,6 @@ impl ::core::clone::Clone for EXCEPINFO {
         *self
     }
 }
-pub const E_INVALIDARG: HRESULT = -2147024809i32;
 pub type FARPROC = ::core::option::Option<unsafe extern "system" fn() -> isize>;
 #[repr(C)]
 pub struct FILETIME {
@@ -999,5 +998,6 @@ pub const VT_UI1: VARENUM = 17u16;
 pub const VT_UI2: VARENUM = 18u16;
 pub const VT_UI4: VARENUM = 19u16;
 pub const VT_UI8: VARENUM = 21u16;
+pub const VT_UNKNOWN: VARENUM = 13u16;
 pub type WAIT_EVENT = u32;
 pub type WIN32_ERROR = u32;

crates/libs/core/src/imp/com_bindings.rs

@@ -77,6 +77,7 @@ impl ::core::default::Default for DateTime {
     }
 }
 pub const E_BOUNDS: ::windows_core::HRESULT = ::windows_core::HRESULT(-2147483637i32);
+pub const E_INVALIDARG: ::windows_core::HRESULT = ::windows_core::HRESULT(-2147024809i32);
 pub const E_NOINTERFACE: ::windows_core::HRESULT = ::windows_core::HRESULT(-2147467262i32);
 pub const E_OUTOFMEMORY: ::windows_core::HRESULT = ::windows_core::HRESULT(-2147024882i32);
 ::windows_core::imp::com_interface!(IAgileObject, IAgileObject_Vtbl, 0x94ea2b94_e9cc_49e0_c0ff_ee64ca8f5b90);
@@ -1225,6 +1226,7 @@ impl ::core::default::Default for Size {
         unsafe { ::core::mem::zeroed() }
     }
 }
+pub const TYPE_E_TYPEMISMATCH: ::windows_core::HRESULT = ::windows_core::HRESULT(-2147316576i32);
 #[repr(C)]
 pub struct TimeSpan {
     pub Duration: i64,

crates/libs/core/src/variant.rs

@@ -157,6 +157,56 @@ impl TryFrom<&PROPVARIANT> for VARIANT {
     }
 }
 
+// VT_UNKNOWN
+
+impl From<IUnknown> for VARIANT {
+    fn from(value: IUnknown) -> Self {
+        Self(imp::VARIANT {
+            Anonymous: imp::VARIANT_0 {
+                Anonymous: imp::VARIANT_0_0 { vt: imp::VT_UNKNOWN, wReserved1: 0, wReserved2: 0, wReserved3: 0, Anonymous: imp::VARIANT_0_0_0 { punkVal: value.into_raw() } },
+            },
+        })
+    }
+}
+
+impl From<IUnknown> for PROPVARIANT {
+    fn from(value: IUnknown) -> Self {
+        Self(imp::PROPVARIANT {
+            Anonymous: imp::PROPVARIANT_0 {
+                Anonymous: imp::PROPVARIANT_0_0 { vt: imp::VT_UNKNOWN, wReserved1: 0, wReserved2: 0, wReserved3: 0, Anonymous: imp::PROPVARIANT_0_0_0 { punkVal: value.into_raw() } },
+            },
+        })
+    }
+}
+
+impl TryFrom<&VARIANT> for IUnknown {
+    type Error = Error;
+    fn try_from(from: &VARIANT) -> Result<Self> {
+        unsafe {
+            if from.0.Anonymous.Anonymous.vt == imp::VT_UNKNOWN && !from.0.Anonymous.Anonymous.Anonymous.punkVal.is_null() {
+                let unknown: &IUnknown = std::mem::transmute(&from.0.Anonymous.Anonymous.Anonymous.punkVal);
+                Ok(unknown.clone())
+            } else {
+                Err(Error { code: imp::TYPE_E_TYPEMISMATCH, info: None })
+            }
+        }
+    }
+}
+
+impl TryFrom<&PROPVARIANT> for IUnknown {
+    type Error = Error;
+    fn try_from(from: &PROPVARIANT) -> Result<Self> {
+        unsafe {
+            if from.0.Anonymous.Anonymous.vt == imp::VT_UNKNOWN && !from.0.Anonymous.Anonymous.Anonymous.punkVal.is_null() {
+                let unknown: &IUnknown = std::mem::transmute(&from.0.Anonymous.Anonymous.Anonymous.punkVal);
+                Ok(unknown.clone())
+            } else {
+                Err(Error { code: imp::TYPE_E_TYPEMISMATCH, info: None })
+            }
+        }
+    }
+}
+
 // VT_BSTR
 
 impl From<BSTR> for VARIANT {

crates/tests/variant/Cargo.toml

@@ -6,3 +6,10 @@ publish = false
 
 [dependencies.windows-core]
 path = "../../libs/core"
+
+[dependencies.windows]
+path = "../../libs/windows"
+features = [
+    "Foundation",
+    "Win32_Foundation",
+]

crates/tests/variant/tests/tests.rs

@@ -1,3 +1,5 @@
+use windows::Foundation::Uri;
+use windows::Win32::Foundation::TYPE_E_TYPEMISMATCH;
 use windows_core::*;
 
 #[test]
@@ -69,6 +71,18 @@ fn test_variant() -> Result<()> {
     assert_eq!(VARIANT::from(3.5f64), VARIANT::from(3.5f64));
     assert_ne!(VARIANT::from(3.5f64), VARIANT::from(0.0f64));
 
+    let unknown: IUnknown = Uri::CreateUri(h!("https://github.com/"))?.into();
+    let v = VARIANT::from(unknown);
+    let unknown = IUnknown::try_from(&v)?;
+    assert_eq!(unknown.cast::<Uri>()?.Domain()?, "github.com");
+    assert_eq!(i32::try_from(&v).unwrap_err().code(), TYPE_E_TYPEMISMATCH);
+    assert_eq!(
+        IUnknown::try_from(&VARIANT::from(3.5f64))
+            .unwrap_err()
+            .code(),
+        TYPE_E_TYPEMISMATCH
+    );
+
     let v = VARIANT::from(BSTR::from("hello"));
     assert_eq!(BSTR::try_from(&v)?, "hello");
     assert_eq!(
@@ -168,6 +182,18 @@ fn test_propvariant() -> Result<()> {
     assert_eq!(PROPVARIANT::from(3.5f64), PROPVARIANT::from(3.5f64));
     assert_ne!(PROPVARIANT::from(3.5f64), PROPVARIANT::from(0.0f64));
 
+    let unknown: IUnknown = Uri::CreateUri(h!("https://github.com/"))?.into();
+    let v = PROPVARIANT::from(unknown);
+    let unknown = IUnknown::try_from(&v)?;
+    assert_eq!(unknown.cast::<Uri>()?.Domain()?, "github.com");
+    assert_eq!(i32::try_from(&v).unwrap_err().code(), TYPE_E_TYPEMISMATCH);
+    assert_eq!(
+        IUnknown::try_from(&PROPVARIANT::from(3.5f64))
+            .unwrap_err()
+            .code(),
+        TYPE_E_TYPEMISMATCH
+    );
+
     let v = PROPVARIANT::from(BSTR::from("hello"));
     assert_eq!(BSTR::try_from(&v)?, "hello");
     assert_eq!(

crates/tools/core/bindings.txt

@@ -5,7 +5,6 @@
 
 --filter
     Windows.Win32.Foundation.CloseHandle
-    Windows.Win32.Foundation.E_INVALIDARG
     Windows.Win32.Foundation.ERROR_NO_UNICODE_TRANSLATION
     Windows.Win32.Foundation.FreeLibrary
     Windows.Win32.Foundation.GetLastError
@@ -67,3 +66,4 @@
     Windows.Win32.System.Variant.VT_UI2
     Windows.Win32.System.Variant.VT_UI4
     Windows.Win32.System.Variant.VT_UI8
+    Windows.Win32.System.Variant.VT_UNKNOWN

crates/tools/core/com_bindings.txt

@@ -10,10 +10,12 @@
     Windows.Win32.Foundation.CLASS_E_CLASSNOTAVAILABLE
     Windows.Win32.Foundation.CO_E_NOTINITIALIZED
     Windows.Win32.Foundation.E_BOUNDS
+    Windows.Win32.Foundation.E_INVALIDARG
     Windows.Win32.Foundation.E_NOINTERFACE
     Windows.Win32.Foundation.E_OUTOFMEMORY
     Windows.Win32.Foundation.JSCRIPT_E_CANTEXECUTE
     Windows.Win32.Foundation.RPC_E_DISCONNECTED
+    Windows.Win32.Foundation.TYPE_E_TYPEMISMATCH
     Windows.Win32.System.Com.CoCreateGuid
     Windows.Win32.System.Com.GetErrorInfo
     Windows.Win32.System.Com.IAgileObject
@@ -24,4 +26,4 @@
     Windows.Win32.System.WinRT.ILanguageExceptionErrorInfo2
     Windows.Win32.System.WinRT.IRestrictedErrorInfo
     Windows.Win32.System.WinRT.IWeakReferenceSource
-    Windows.Win32.System.WinRT.RoGetAgileReference
+    Windows.Win32.System.WinRT.RoGetAgileReference