COM

<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CMyExtension<br />
class ATL_NO_VTABLE CMyExtension : <br />
	public CComObjectRootEx<CComSingleThreadModel>,<br />
	public CComCoClass<CMyExtension, &CLSID_MyExtension>,<br />
	public ISupportErrorInfo,<br />
	public IMyExtension,<br />
	public IExtension,<br />
	public IExtensionConfig<br />
{<br />
public:<br />
	CMyExtension()<br />
	{<br />
           //Get the below two constants from the _i.c<br />
           const CLSID CLSID_TargetLayer = {0x2CEBA738,0x0533,0x4F68,{0xB1,0xC5,0x88,0xB3,0xD9,0x5B,0xA3,0xE3}};<br />
           const IID IID_ITargetLayer = {0xD149DEA4,0xBB32,0x4D9A,{0x88,0xC7,0xA2,0x61,0x43,0x7D,0xC8,0xBA}};<br />
<br />
           //create the com<br />
           HRESULT hr = CoCreateInstance(CLSID_TargetLayer, NULL, <br />
                          CLSCTX_INPROC_SERVER,IID_ITargetLayer,<br />
                          (LPVOID*) &m_ipTargetLayer);<br />
           if (SUCCEEDED(hr))<br />
           {<br />
           }<br />
	}<br />
<br />
DECLARE_REGISTRY_RESOURCEID(IDR_MYEXTENSION)<br />
<br />
DECLARE_PROTECT_FINAL_CONSTRUCT()<br />
<br />
BEGIN_COM_MAP(CMyExtension)<br />
	COM_INTERFACE_ENTRY(IHistoryExtension)<br />
	COM_INTERFACE_ENTRY(ISupportErrorInfo)<br />
	COM_INTERFACE_ENTRY(IExtension)<br />
	COM_INTERFACE_ENTRY(IExtensionConfig)<br />
END_COM_MAP()<br />
<br />
BEGIN_CATEGORY_MAP(CMyExtension)<br />
	IMPLEMENTED_CATEGORY( __uuidof(CATID_MxExtension))<br />
END_CATEGORY_MAP()<br />
<br />
// ISupportsErrorInfo<br />
	STDMETHOD(InterfaceSupportsErrorInfo)(REFIID riid);<br />
<br />
// IHistoryExtension<br />
public:<br />
// IExtension<br />
	STDMETHOD(get_Name)(BSTR * extensionName);<br />
<br />
	STDMETHOD(Startup)(VARIANT * initializationData);<br />
<br />
	STDMETHOD(Shutdown)();<br />
<br />
   // IExtensionConfig<br />
	STDMETHOD(get_ProductName)(BSTR * Name);<br />
	STDMETHOD(get_Description)(BSTR * Description);<br />
	STDMETHOD(get_State)(esriExtensionState * State);<br />
	STDMETHOD(put_State)(esriExtensionState State);<br />
<br />
<br />
  // My methods that deal with custom com object<br />
        HRESULT SetTargetName(BSTR Name);<br />
        HRESULT GetTargetName(BSTR *Name);<br />
<br />
private:<br />
   esriExtensionState m_ExtensionState;<br />
   IApplicationPtr m_ipApp;<br />
   BSTR m_szTargetLayer;<br />
   ITargetLayer *m_ipTargetLayer; //custom com object<br />
};<br />
<br />
<br />
//////////////////////////////////<br />
<br />
//CPP MyHistoryExtension<br />
<br />
//..... removed IExtension and IExtensionConfig methods for easier reading<br />
// Just left functions that deal with custom com object<br />
<br />
HRESULT CMyExtension::SetTargetName(BSTR Name)<br />
{<br />
   return this->m_ipTargetLayer->PutTargetLayerName(Name);<br />
}<br />
<br />
HRESULT CMyExtension::GetTargetName(BSTR *Name)<br />
{<br />
   BSTR tmp;<br />
   HRESULT hr = this->m_ipTargetLayer->GetTargetLayerName(&tmp);<br />
   if(SUCCEEDED(hr)){<br />
      *Name = tmp;<br />
      return S_OK;<br />
   }<br />
<br />
   return E_FAIL;<br />
}<br />
<br />
<br />
////////<br />
// this is an ICommand Implementation.. CPP.<br />
<br />
//I want to get the target layer to see if the Command should be *Enabled<br />
<br />
<br />
STDMETHODIMP CMyCommand::get_Enabled(VARIANT_BOOL * Enabled)<br />
{<br />
   if (Enabled == NULL)<br />
		return E_POINTER;<br />
<br />
   HRESULT hr;<br />
   long selectionCount;<br />
   IExtensionPtr pExtension;<br />
   IExtensionConfigPtr pExtConfig;<br />
   esriExtensionState state;<br />
<br />
   hr =this->m_ipMxDoc->get_FocusMap(&(this->m_ipMap));<br />
   if(FAILED(hr)){return hr;}<br />
   hr = this->m_ipMap->get_SelectionCount(&selectionCount);<br />
   if(FAILED(hr)){return hr;}<br />
<br />
   hr = this->m_ipApp->FindExtensionByName(::SysAllocString(L"My Extension"), &pExtension);<br />
   if(FAILED(hr)){return hr;}<br />
<br />
   pExtConfig = pExtension;<br />
   pExtConfig->get_State(&state);<br />
   if(FAILED(hr)){return hr;}<br />
<br />
<br />
   // ..Problem area .. I Want to QI to my own implementation of IExtension<br />
   CComPtr<IMyExtension> pHistExt;<br />
   const CLSID CLISID_MyExtension = {0x442A8EAF,0x8723,0x4FED,{0xA8,0xA9,0x6D,0x2B,0x65,0x77,0x26,0x61}};<br />
   hr = pExtension->QueryInterface(CLISID_MyExtension, (void **)&pHistExt);<br />
<br />
   CComBSTR szTName;<br />
<br />
   //Compiler BOMBS on this call ....<br />
   //MyCommand.cpp(78) : error C2039: 'GetTargetName' : is not a member of '_NoAddRefReleaseOnCComPtr<struct IMyExtension>'<br />
   hr = pHistExt->GetTargetName(&szTName); //It clearly is a member, as you can see defined above<br />
   if(FAILED(hr)){return hr;}<br />
<br />
   // ..end of problem area<br />
<br />
<br />
   //We need to be find out editing mode<br />
   esriEditState pState;<br />
   hr = this->m_ipEditor->get_EditState(&pState);<br />
   if(FAILED(hr)){return hr;}<br />
<br />
   if(selectionCount>0 && (state == esriESEnabled) && (pState == esriStateEditing) /*&&(layerName != NULL)*/){<br />
      *Enabled = VARIANT_TRUE;<br />
   }else{<br />
      //Set to false, Command is not currently active<br />
      *Enabled = VARIANT_FALSE;<br />
   }<br />
<br />
	return S_OK;<br />
}<br />

<br />
extern "C" void __stdcall GetMerchandiseCol(IDispatch* pMerchandiseCol)<br />
{<br />
	HRESULT hr = CoInitialize(0);<br />
	if (SUCCEEDED(hr))<br />
	{<br />
		dbMerch dbM; 		 	// recordset object<br />
		_clsMerchandise* pMerch; 	// VB-defined object<br />
		_colMerchs* pMerchCol;   	// VB-defined collection object<br />
		<br />
		hr = pMerchandiseCol->QueryInterface(__uuidof(_colMerchs), (void **) &pMerchCol);<br />
<br />
		if(SUCCEEDED(hr))<br />
		{<br />
			if(dbM.Open())<br />
			{<br />
				VARIANT varItem;<br />
				CComPtr<IUnknown> pUnk;<br />
				CComPtr<IUnknown> pMerchandise;<br />
				CComQIPtr<IEnumVARIANT, &IID_IEnumVARIANT> pNewEnum;<br />
				//the next line gets a new enum in collection so I can fill it<br />
				if (SUCCEEDED(pMerchCol->get_NewEnum(&pUnk)) && pUnk != NULL)<br />
				{<br />
					pNewEnum = pUnk;<br />
					hr = pNewEnum->QueryInterface(__uuidof(_clsMerchandise), (void **) &pMerch); <br />
//the line above fails. When I debug this line, I go to the following code in ATLBASE.h<br />
	<br />
	_NoAddRefReleaseOnCComPtr<T>* operator->() const<br />
	{<br />
		ATLASSERT(p!=NULL);<br />
		return (_NoAddRefReleaseOnCComPtr<T>*)p;<br />
	}<br />
<br />
//Any suggestions? I am a little out of my depth with this stuff, but I feel I am very close to having this <br />
//code work. Thanks in advance for whatever help you can provide.<br />