makegwenum.py :  » Windows » pyExcelerator » pywin32-214 » com » win32com » makegw » Python Open Source

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Python Open Source » Windows » pyExcelerator 
pyExcelerator » pywin32 214 » com » win32com » makegw » makegwenum.py
"""Utility file for generating PyIEnum support.

This is almost a 'template' file.  It simplay contains almost full
C++ source code for PyIEnum* support, and the Python code simply
substitutes the appropriate interface name.

This module is notmally not used directly - the @makegw@ module
automatically calls this.
"""
#
# INTERNAL FUNCTIONS
#
#
import string

def is_interface_enum(enumtype):
  return not (enumtype[0] in string.uppercase and enumtype[2] in string.uppercase)


def _write_enumifc_cpp(f, interface):
  enumtype = interface.name[5:]
  if is_interface_enum(enumtype):
    # Assume an interface.
    enum_interface = "I" + enumtype[:-1]
    converter = "PyObject *ob = PyCom_PyObjectFromIUnknown(rgVar[i], IID_%(enum_interface)s, FALSE);" % locals()
    arraydeclare = "%(enum_interface)s **rgVar = new %(enum_interface)s *[celt];" % locals()
  else:
    # Enum of a simple structure
    converter = "PyObject *ob = PyCom_PyObjectFrom%(enumtype)s(&rgVar[i]);" % locals()
    arraydeclare = "%(enumtype)s *rgVar = new %(enumtype)s[celt];" % locals()

  f.write(\
'''
// ---------------------------------------------------
//
// Interface Implementation

PyIEnum%(enumtype)s::PyIEnum%(enumtype)s(IUnknown *pdisp):
  PyIUnknown(pdisp)
{
  ob_type = &type;
}

PyIEnum%(enumtype)s::~PyIEnum%(enumtype)s()
{
}

/* static */ IEnum%(enumtype)s *PyIEnum%(enumtype)s::GetI(PyObject *self)
{
  return (IEnum%(enumtype)s *)PyIUnknown::GetI(self);
}

// @pymethod object|PyIEnum%(enumtype)s|Next|Retrieves a specified number of items in the enumeration sequence.
PyObject *PyIEnum%(enumtype)s::Next(PyObject *self, PyObject *args)
{
  long celt = 1;
  // @pyparm int|num|1|Number of items to retrieve.
  if ( !PyArg_ParseTuple(args, "|l:Next", &celt) )
    return NULL;

  IEnum%(enumtype)s *pIE%(enumtype)s = GetI(self);
  if ( pIE%(enumtype)s == NULL )
    return NULL;

  %(arraydeclare)s
  if ( rgVar == NULL ) {
    PyErr_SetString(PyExc_MemoryError, "allocating result %(enumtype)ss");
    return NULL;
  }

  int i;
/*  for ( i = celt; i--; )
    // *** possibly init each structure element???
*/

  ULONG celtFetched = 0;
  PY_INTERFACE_PRECALL;
  HRESULT hr = pIE%(enumtype)s->Next(celt, rgVar, &celtFetched);
  PY_INTERFACE_POSTCALL;
  if (  HRESULT_CODE(hr) != ERROR_NO_MORE_ITEMS && FAILED(hr) )
  {
    delete [] rgVar;
    return PyCom_BuildPyException(hr,pIE%(enumtype)s, IID_IE%(enumtype)s);
  }

  PyObject *result = PyTuple_New(celtFetched);
  if ( result != NULL )
  {
    for ( i = celtFetched; i--; )
    {
      %(converter)s
      if ( ob == NULL )
      {
        Py_DECREF(result);
        result = NULL;
        break;
      }
      PyTuple_SET_ITEM(result, i, ob);
    }
  }

/*  for ( i = celtFetched; i--; )
    // *** possibly cleanup each structure element???
*/
  delete [] rgVar;
  return result;
}

// @pymethod |PyIEnum%(enumtype)s|Skip|Skips over the next specified elementes.
PyObject *PyIEnum%(enumtype)s::Skip(PyObject *self, PyObject *args)
{
  long celt;
  if ( !PyArg_ParseTuple(args, "l:Skip", &celt) )
    return NULL;

  IEnum%(enumtype)s *pIE%(enumtype)s = GetI(self);
  if ( pIE%(enumtype)s == NULL )
    return NULL;

  PY_INTERFACE_PRECALL;
  HRESULT hr = pIE%(enumtype)s->Skip(celt);
  PY_INTERFACE_POSTCALL;
  if ( FAILED(hr) )
    return PyCom_BuildPyException(hr, pIE%(enumtype)s, IID_IE%(enumtype)s);

  Py_INCREF(Py_None);
  return Py_None;
}

// @pymethod |PyIEnum%(enumtype)s|Reset|Resets the enumeration sequence to the beginning.
PyObject *PyIEnum%(enumtype)s::Reset(PyObject *self, PyObject *args)
{
  if ( !PyArg_ParseTuple(args, ":Reset") )
    return NULL;

  IEnum%(enumtype)s *pIE%(enumtype)s = GetI(self);
  if ( pIE%(enumtype)s == NULL )
    return NULL;

  PY_INTERFACE_PRECALL;
  HRESULT hr = pIE%(enumtype)s->Reset();
  PY_INTERFACE_POSTCALL;
  if ( FAILED(hr) )
    return PyCom_BuildPyException(hr, pIE%(enumtype)s, IID_IE%(enumtype)s);

  Py_INCREF(Py_None);
  return Py_None;
}

// @pymethod <o PyIEnum%(enumtype)s>|PyIEnum%(enumtype)s|Clone|Creates another enumerator that contains the same enumeration state as the current one
PyObject *PyIEnum%(enumtype)s::Clone(PyObject *self, PyObject *args)
{
  if ( !PyArg_ParseTuple(args, ":Clone") )
    return NULL;

  IEnum%(enumtype)s *pIE%(enumtype)s = GetI(self);
  if ( pIE%(enumtype)s == NULL )
    return NULL;

  IEnum%(enumtype)s *pClone;
  PY_INTERFACE_PRECALL;
  HRESULT hr = pIE%(enumtype)s->Clone(&pClone);
  PY_INTERFACE_POSTCALL;
  if ( FAILED(hr) )
    return PyCom_BuildPyException(hr, pIE%(enumtype)s, IID_IE%(enumtype)s);

  return PyCom_PyObjectFromIUnknown(pClone, IID_IEnum%(enumtype)s, FALSE);
}

// @object PyIEnum%(enumtype)s|A Python interface to IEnum%(enumtype)s
static struct PyMethodDef PyIEnum%(enumtype)s_methods[] =
{
  { "Next", PyIEnum%(enumtype)s::Next, 1 },    // @pymeth Next|Retrieves a specified number of items in the enumeration sequence.
  { "Skip", PyIEnum%(enumtype)s::Skip, 1 },  // @pymeth Skip|Skips over the next specified elementes.
  { "Reset", PyIEnum%(enumtype)s::Reset, 1 },  // @pymeth Reset|Resets the enumeration sequence to the beginning.
  { "Clone", PyIEnum%(enumtype)s::Clone, 1 },  // @pymeth Clone|Creates another enumerator that contains the same enumeration state as the current one.
  { NULL }
};

PyComEnumTypeObject PyIEnum%(enumtype)s::type("PyIEnum%(enumtype)s",
    &PyIUnknown::type,
    sizeof(PyIEnum%(enumtype)s),
    PyIEnum%(enumtype)s_methods,
    GET_PYCOM_CTOR(PyIEnum%(enumtype)s));
''' % locals() )



def _write_enumgw_cpp(f, interface):
  enumtype = interface.name[5:]
  if is_interface_enum(enumtype):
    # Assume an interface.
    enum_interface = "I" + enumtype[:-1]
    converter = "if ( !PyCom_InterfaceFromPyObject(ob, IID_%(enum_interface)s, (void **)&rgVar[i], FALSE) )" % locals()
    argdeclare="%(enum_interface)s __RPC_FAR * __RPC_FAR *rgVar" % locals()
  else:
    argdeclare="%(enumtype)s __RPC_FAR *rgVar" % locals()
    converter="if ( !PyCom_PyObjectAs%(enumtype)s(ob, &rgVar[i]) )" % locals()
  f.write(
'''
// ---------------------------------------------------
//
// Gateway Implementation

// Std delegation
STDMETHODIMP_(ULONG) PyGEnum%(enumtype)s::AddRef(void) {return PyGatewayBase::AddRef();}
STDMETHODIMP_(ULONG) PyGEnum%(enumtype)s::Release(void) {return PyGatewayBase::Release();}
STDMETHODIMP PyGEnum%(enumtype)s::QueryInterface(REFIID iid, void ** obj) {return PyGatewayBase::QueryInterface(iid, obj);}
STDMETHODIMP PyGEnum%(enumtype)s::GetTypeInfoCount(UINT FAR* pctInfo) {return PyGatewayBase::GetTypeInfoCount(pctInfo);}
STDMETHODIMP PyGEnum%(enumtype)s::GetTypeInfo(UINT itinfo, LCID lcid, ITypeInfo FAR* FAR* pptInfo) {return PyGatewayBase::GetTypeInfo(itinfo, lcid, pptInfo);}
STDMETHODIMP PyGEnum%(enumtype)s::GetIDsOfNames(REFIID refiid, OLECHAR FAR* FAR* rgszNames, UINT cNames, LCID lcid, DISPID FAR* rgdispid) {return PyGatewayBase::GetIDsOfNames( refiid, rgszNames, cNames, lcid, rgdispid);}
STDMETHODIMP PyGEnum%(enumtype)s::Invoke(DISPID dispid, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS FAR* params, VARIANT FAR* pVarResult, EXCEPINFO FAR* pexcepinfo, UINT FAR* puArgErr) {return PyGatewayBase::Invoke( dispid, riid, lcid, wFlags, params, pVarResult, pexcepinfo, puArgErr);}

STDMETHODIMP PyGEnum%(enumtype)s::Next( 
            /* [in] */ ULONG celt,
            /* [length_is][size_is][out] */ %(argdeclare)s,
            /* [out] */ ULONG __RPC_FAR *pCeltFetched)
{
  PY_GATEWAY_METHOD;
  PyObject *result;
  HRESULT hr = InvokeViaPolicy("Next", &result, "i", celt);
  if ( FAILED(hr) )
    return hr;

  if ( !PySequence_Check(result) )
    goto error;
  int len;
  len = PyObject_Length(result);
  if ( len == -1 )
    goto error;
  if ( len > (int)celt)
    len = celt;

  if ( pCeltFetched )
    *pCeltFetched = len;

  int i;
  for ( i = 0; i < len; ++i )
  {
    PyObject *ob = PySequence_GetItem(result, i);
    if ( ob == NULL )
      goto error;

    %(converter)s
    {
      Py_DECREF(result);
      return PyCom_SetCOMErrorFromPyException(IID_IEnum%(enumtype)s);
    }
  }

  Py_DECREF(result);

  return len < (int)celt ? S_FALSE : S_OK;

  error:
  PyErr_Clear();  // just in case
  Py_DECREF(result);
  return PyCom_SetCOMErrorFromSimple(E_FAIL, IID_IEnum%(enumtype)s, "Next() did not return a sequence of objects");
}

STDMETHODIMP PyGEnum%(enumtype)s::Skip( 
            /* [in] */ ULONG celt)
{
  PY_GATEWAY_METHOD;
  return InvokeViaPolicy("Skip", NULL, "i", celt);
}

STDMETHODIMP PyGEnum%(enumtype)s::Reset(void)
{
  PY_GATEWAY_METHOD;
  return InvokeViaPolicy("Reset");
}

STDMETHODIMP PyGEnum%(enumtype)s::Clone( 
            /* [out] */ IEnum%(enumtype)s __RPC_FAR *__RPC_FAR *ppEnum)
{
  PY_GATEWAY_METHOD;
  PyObject * result;
  HRESULT hr = InvokeViaPolicy("Clone", &result);
  if ( FAILED(hr) )
    return hr;

  /*
  ** Make sure we have the right kind of object: we should have some kind
  ** of IUnknown subclass wrapped into a PyIUnknown instance.
  */
  if ( !PyIBase::is_object(result, &PyIUnknown::type) )
  {
    /* the wrong kind of object was returned to us */
    Py_DECREF(result);
    return PyCom_SetCOMErrorFromSimple(E_FAIL, IID_IEnum%(enumtype)s);
  }

  /*
  ** Get the IUnknown out of the thing. note that the Python ob maintains
  ** a reference, so we don't have to explicitly AddRef() here.
  */
  IUnknown *punk = ((PyIUnknown *)result)->m_obj;
  if ( !punk )
  {
    /* damn. the object was released. */
    Py_DECREF(result);
    return PyCom_SetCOMErrorFromSimple(E_FAIL, IID_IEnum%(enumtype)s);
  }

  /*
  ** Get the interface we want. note it is returned with a refcount.
  ** This QI is actually going to instantiate a PyGEnum%(enumtype)s.
  */
  hr = punk->QueryInterface(IID_IEnum%(enumtype)s, (LPVOID *)ppEnum);

  /* done with the result; this DECREF is also for <punk> */
  Py_DECREF(result);

  return PyCom_SetCOMErrorFromSimple(hr, IID_IEnum%(enumtype)s, "Python could not convert the result from Next() into the required COM interface");
}
''' % locals())
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