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FUNCTION.CPP (BROWSEH OLE Sample)

/*************************************************************************

  • OLE Automation TypeLibrary Browse Helper Sample

  • function.cpp

  • CFunction implementation

  • Written by Microsoft Product Support Services, Windows Developer Support

  • (c) Copyright Microsoft Corp. 1994 All Rights Reserved

  • ***********************************************************************/

#include <windows.h>

#include <windowsx.h>

#ifdef WIN16

#include <ole2.h>

#include <compobj.h>

#include <dispatch.h>

#include <variant.h>

#include <olenls.h>

#endif

#include "browseh.h"

/*

* CFunction::Create

*

* Purpose:

* Creates an instance of the Function automation object and initializes it.

*

* Parameters:

* ptinfo TypeInfo of which this Function is an element of.

* nIndex Index of function in containing TypeInfo.

* ppFunction Returns Function automation object.

*

* Return Value:

* HRESULT

*

*/

HRESULT

CFunction::Create(LPTYPEINFO ptinfo, unsigned short nIndex, CFunction FAR* FAR* ppFunction)

{

HRESULT hr;

CFunction FAR* pFunction = NULL;

CTypeDesc FAR* pTypeDesc = NULL;

*ppFunction = NULL;

// Create object.

pFunction = new CFunction();

if (pFunction == NULL)

{

hr = ResultFromScode(E_OUTOFMEMORY);

goto error;

}

// Load type information for the application object from type library.

hr = pFunction->LoadTypeInfo(IID_IFunction);

if (FAILED(hr))

goto error;

hr = ptinfo->GetFuncDesc(nIndex, &pFunction->m_pfuncdesc);

if (FAILED(hr))

goto error;

// Function return type.

hr = CTypeDesc::Create(ptinfo, &pFunction->m_pfuncdesc->elemdescFunc.tdesc, &pTypeDesc);

if (FAILED(hr))

goto error;

pTypeDesc->QueryInterface(IID_IDispatch, (LPVOID FAR*)&pFunction->m_pdispTypeDesc);

hr = ptinfo->GetDocumentation(pFunction->m_pfuncdesc->memid, &pFunction->m_bstrName, &pFunction->m_bstrDocumentation,

&pFunction->m_ulHelpContext, &pFunction->m_bstrHelpFile);

if (FAILED(hr))

goto error;

ptinfo->AddRef();

pFunction->m_ptinfoFunction = ptinfo;

#ifdef _DEBUG

lstrcpyn(pFunction->m_szClassName, TEXT("Function"), 100);

#endif

*ppFunction = pFunction;

return NOERROR;

error:

if (pFunction == NULL) return ResultFromScode(E_OUTOFMEMORY);

if (pFunction->m_pfuncdesc) ptinfo->ReleaseFuncDesc(pFunction->m_pfuncdesc);

if (pFunction->m_ptinfoFunction) pFunction->m_ptinfoFunction->Release();

if (pFunction->m_bstrName) SysFreeString(pFunction->m_bstrName);

if (pFunction->m_bstrDocumentation) SysFreeString(pFunction->m_bstrDocumentation);

if (pFunction->m_bstrHelpFile) SysFreeString(pFunction->m_bstrHelpFile);

// Set to NULL to prevent destructor from attempting to free again

pFunction->m_ptinfoFunction = NULL;

pFunction->m_pfuncdesc = NULL;

pFunction->m_bstrName = NULL;

pFunction->m_bstrDocumentation = NULL;

pFunction->m_bstrHelpFile = NULL;

delete pFunction;

return hr;

}

/*

* CFunction::CFunction

*

* Purpose:

* Constructor for CFunction object. Initializes members to NULL.

*

*/

CFunction::CFunction()

{

m_bstrName = NULL;

m_bstrDocumentation = NULL;

m_bstrHelpFile = NULL;

m_pdispParameters = NULL;

m_ptinfoFunction = NULL;

m_pfuncdesc = NULL;

m_pdispTypeDesc = NULL;

}

/*

* CFunction::~CFunction

*

* Purpose:

* Destructor for CFunction object.

*

*/

CFunction::~CFunction()

{

if (m_bstrName) SysFreeString(m_bstrName);

if (m_bstrDocumentation) SysFreeString(m_bstrDocumentation);

if (m_bstrHelpFile) SysFreeString(m_bstrHelpFile);

if (m_pdispParameters) m_pdispParameters->Release();

if (m_pfuncdesc && m_ptinfoFunction) m_ptinfoFunction->ReleaseFuncDesc(m_pfuncdesc);

if (m_ptinfoFunction) m_ptinfoFunction->Release();

if (m_pdispTypeDesc) m_pdispTypeDesc->Release();

}

STDMETHODIMP_(REFCLSID)

CFunction::GetInterfaceID()

{

return IID_IFunction;

}

STDMETHODIMP_(BSTR)

CFunction::get_Name()

{

return SysAllocString(m_bstrName);

}

STDMETHODIMP_(BSTR)

CFunction::get_Documentation()

{

return SysAllocString(m_bstrDocumentation);

}

STDMETHODIMP_(long)

CFunction::get_HelpContext()

{

return (long)m_ulHelpContext;

}

STDMETHODIMP_(BSTR)

CFunction::get_HelpFile()

{

return SysAllocString(m_bstrHelpFile);

}

STDMETHODIMP_(ITypeDesc FAR*)

CFunction::get_ReturnType()

{

m_pdispTypeDesc->AddRef();

return (ITypeDesc FAR*)m_pdispTypeDesc;

}

STDMETHODIMP_(ICollection FAR*)

CFunction::get_Parameters()

{

HRESULT hr;

CParameter FAR* pParameter;

CCollection FAR* pCollection = NULL;

LPDISPATCH pdisp;

BSTR FAR* rgbstrNames = NULL;

unsigned int cNames;

unsigned short n = 0;

if (m_pdispParameters == NULL)

{

// Create a collection of parameters and return it.

rgbstrNames = new BSTR[m_pfuncdesc->cParams+1];

if (rgbstrNames == NULL)

{RaiseException(IDS_OutOfMemory); return NULL;}

hr = m_ptinfoFunction->GetNames(m_pfuncdesc->memid, rgbstrNames, m_pfuncdesc->cParams+1, &cNames);

if (FAILED(hr))

{RaiseException(IDS_Unexpected); goto error;}

SysFreeString(rgbstrNames[0]);

hr = CCollection::Create(cNames-1, 0, &pCollection);

if (FAILED(hr))

{RaiseException(IDS_Unexpected); goto error;}

for (n=0; n<cNames-1; n++)

{

hr = CParameter::Create(m_ptinfoFunction, rgbstrNames[n+1],

&m_pfuncdesc->lprgelemdescParam[n].tdesc,

&m_pfuncdesc->lprgelemdescParam[n].idldesc,

&pParameter);

if (FAILED(hr))

{RaiseException(IDS_Unexpected); goto error;}

SysFreeString(rgbstrNames[n+1]);

pParameter->QueryInterface(IID_IDispatch, (void FAR* FAR*)&pdisp);

pCollection->Add(pdisp);

pdisp->Release();

}

pCollection->QueryInterface(IID_IDispatch, (void FAR* FAR*)&pdisp);

m_pdispParameters = pdisp;

delete rgbstrNames;

}

m_pdispParameters->AddRef();

return (ICollection FAR*)m_pdispParameters;

error:

if (pCollection) delete pCollection;

if (rgbstrNames)

for (; n<cNames-1; n++)

SysFreeString(rgbstrNames[n+1]);

return NULL;

}

STDMETHODIMP_(MEMBERID)

CFunction::get_Memberid()

{

return m_pfuncdesc->memid;

}

STDMETHODIMP_(CALLCONV)

CFunction::get_CallConvention()

{

return m_pfuncdesc->callconv;

}

STDMETHODIMP_(FUNCKIND)

CFunction::get_FuncKind()

{

return m_pfuncdesc->funckind;

}

STDMETHODIMP_(INVOKEKIND)

CFunction::get_InvocationKind()

{

return m_pfuncdesc->invkind;

}

STDMETHODIMP_(OBJTYPE)

CFunction::get_Kind()

{

return TYPE_FUNCTION;

}


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