CComSafeArray Class for my Interface, structures

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Dear Friends!
I have problem while working with ATL(VS2008, C++).
I must use SAFEARRAY(IMyObject*)* parameters in idl file.
If SAFEARRAY(double)*, then use the CComSafeArray<double>..., but for interfaces or my structures, I don't know how to solve.
Thank you in advanced.

The idl file is...

C++

...

interface IMyObj2;
...

typedef struct SMyObj2{
    IMyObj2 * iobject;
}SMyObj2;

...

//.IMyObj2
[
	object,
	uuid(3454B81A-65A9-4F3E-8678-1D5F82B25837),
	oleautomation,
	nonextensible,
	helpstring("IMyObj2 Interface"),
	pointer_default(unique)
]
interface IMyObj2 : IUnknown{
	[propget, helpstring("property ID")] 
	HRESULT ID([out, retval] LONG* pVal);
	[propput, helpstring("property ID")] 
	HRESULT ID([in] LONG newVal);
};

...


[
	object,
	uuid(EF532C8B-12A9-4FEC-B91C-D7502FD68874),
	oleautomation,
	nonextensible,
	helpstring("IArrayMan3 Interface"),
	pointer_default(unique)
]

interface IArrayMan3 : IUnknown{
	[helpstring("method GetArray")] 
	HRESULT _stdcall GetArray2(SAFEARRAY(SMyObj2)* pArray);
	[helpstring("method PutArray")] 
	HRESULT _stdcall PutArray2(SAFEARRAY(SMyObj2) pArray);
};

C++ file...

C++

STDMETHOD(GetArray2)(SAFEARRAY** pArray)
{
	CComSafeArray<IUnknown*> ppp;//.Compile Okay.
//	CComSafeArray<SMyObj2, VT_VARIANT> arr;//.Compile Error
//      CComSafeArray<IMyObj2*> ttt;//.Compile Error
	return S_OK;
}

Posted 18-Sep-12 22:06pm

Mem 9021960

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skydger · Accepted Answer · 2012-09-18T23:30:00

Greetings!
First of all it is nessesary to get an info from type library using IRecordInfo interface:

C++

GUID GUID_SMyObj2 = __uuidof(SMyObj2);
HRESULT hr;
CComPtr<IRecordInfo> srecnfo;
hr = GetRecordInfoFromGuids(LIBID_MyLib /*here is your type lib identifier*/, 1, 0, 0, GUID_SMyObj2, &srecnfo);
if(FAILED(hr))
  _com_issue_errorex(hr, NULL, IID_NULL);

If this part will be successful, then it is possible to create a safearray or custom type:

C++

const LONG l_bound = 0, u_bound = 2;
LPSAFEARRAY lpSMyObj2 = SafeArrayCreateVectorEx(VT_RECORD, l_bound,
  u_bound - l_bound + 1, srecnfo);
if(!lpSMyObj2)
  _com_issue_errorex(E_FAIL, NULL, IID_NULL);

or access and use existing:

C++

//LPSAFEARRAY lpSMyObj2 got from somewhere
//getting bounds of array
  LONG l_bound = 0, u_bound = 0;
  HRESULT hr1 = SafeArrayGetLBound(lpSMyObj2, 1, &l_bound);
  HRESULT hr2 = SafeArrayGetUBound(lpSMyObj2, 1, &u_bound);
  if(FAILED(hr1) || FAILED(hr2) )
  {
      // handle an error
  }
  else
  { 
     ...
     SMyObj2 * pSMyObj2 = NULL;
     HRESULT hr = SafeArrayAccessData(lpSMyObj2, (void**)&pSMyObj2);
     if(FAILED(hr))
       _com_issue_errorex(hr, NULL, IID_NULL);
     ...
  }
  // modifying data if needed
  for(int i = l_bound; i <= u_bound - l_bound; i++)
  {
    // do something with pSMyObj2[i].iobject
  }
  ...
  // Releasing an array
  hr = SafeArrayUnaccessData(lpSMyObj2);
  if(FAILED(hr))
    _com_issue_errorex(hr, NULL, IID_NULL);

Please see http://msdn.microsoft.com/en-us/library/aa148975.aspx[^] for more details