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Copy pathmethodwrapper.cs
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61 lines (43 loc) · 2.13 KB
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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.Collections;
using System.Runtime.InteropServices;
namespace Python.Runtime {
/// <summary>
/// A MethodWrapper wraps a static method of a managed type,
/// making it callable by Python as a PyCFunction object. This is
/// currently used mainly to implement special cases like the CLR
/// import hook.
/// </summary>
internal class MethodWrapper {
public IntPtr mdef;
public IntPtr ptr;
public MethodWrapper(Type type, string name) {
// Turn the managed method into a function pointer
IntPtr fp = Interop.GetThunk(type.GetMethod(name));
// XXX - here we create a Python string object, then take the
// char * of the internal string to pass to our methoddef
// structure. Its a hack, and the name is leaked!
IntPtr ps = Runtime.PyString_FromString(name);
IntPtr sp = Runtime.PyString_AS_STRING(ps);
// Allocate and initialize a PyMethodDef structure to represent
// the managed method, then create a PyCFunction.
mdef = Runtime.PyMem_Malloc(4 * IntPtr.Size);
Marshal.WriteIntPtr(mdef, sp);
Marshal.WriteIntPtr(mdef, (1 * IntPtr.Size), fp);
Marshal.WriteIntPtr(mdef, (2 * IntPtr.Size), (IntPtr)0x0002);
Marshal.WriteIntPtr(mdef, (3 * IntPtr.Size), IntPtr.Zero);
ptr = Runtime.PyCFunction_New(mdef, IntPtr.Zero);
}
public IntPtr Call(IntPtr args, IntPtr kw) {
return Runtime.PyCFunction_Call(ptr, args, kw);
}
}
}