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GeezerVison is showing github.com — pythonnet/src/runtime/interfaceobject.cs at python3 · fkarb/pythonnet

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interfaceobject.cs

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// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
using System;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Python.Runtime {
/// <summary>
/// Provides the implementation for reflected interface types. Managed
/// interfaces are represented in Python by actual Python type objects.
/// Each of those type objects is associated with an instance of this
/// class, which provides the implementation for the Python type.
/// </summary>
internal class InterfaceObject : ClassBase {
internal ConstructorInfo ctor;
internal InterfaceObject(Type tp) : base(tp) {
CoClassAttribute coclass = (CoClassAttribute)
Attribute.GetCustomAttribute(tp, cc_attr);
if (coclass != null) {
ctor = coclass.CoClass.GetConstructor(Type.EmptyTypes);
}
}
static Type cc_attr;
static InterfaceObject() {
cc_attr = typeof(CoClassAttribute);
}
//====================================================================
// Implements __new__ for reflected interface types.
//====================================================================
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw) {
InterfaceObject self = (InterfaceObject)GetManagedObject(tp);
int nargs = Runtime.PyTuple_Size(args);
Type type = self.type;
Object obj;
if (nargs == 1) {
IntPtr inst = Runtime.PyTuple_GetItem(args, 0);
CLRObject co = GetManagedObject(inst) as CLRObject;
if ((co == null) || (!type.IsInstanceOfType(co.inst))) {
string msg = "object does not implement " + type.Name;
Exceptions.SetError(Exceptions.TypeError, msg);
return IntPtr.Zero;
}
obj = co.inst;
}
else if ((nargs == 0) && (self.ctor != null)) {
obj = self.ctor.Invoke(null);
if (obj == null || !type.IsInstanceOfType(obj)) {
Exceptions.SetError(Exceptions.TypeError,
"CoClass default constructor failed"
);
return IntPtr.Zero;
}
}
else {
Exceptions.SetError(Exceptions.TypeError,
"interface takes exactly one argument"
);
return IntPtr.Zero;
}
return CLRObject.GetInstHandle(obj, self.pyHandle);
}
}
}
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