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pythonnet/src/runtime/interfaceobject.cs at master · yaqingwang/pythonnet · GitHub
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interfaceobject.cs
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runtime
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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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