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Questionsend a COM object with a BSTR value type in a MSMQ message Pin
jxtamarc9-Mar-09 7:32
jxtamarc9-Mar-09 7:32 
Hi everyone,

I'm trying to send a COM object over a MSMQ message in C++. This is my object :

class ATL_NO_VTABLE CAnalisis :
	public CComObjectRootEx<ccomsinglethreadmodel>,
	public CComCoClass<canalisis,>,
	public ISupportErrorInfo,
	public IDispatchImpl,
	public IPersistStreamInit
{
private:
	typedef struct {
		DOUBLE size;
		float color;
		float light;
		
		BSTR imgName;
		
		BSTR  uname;

	} Image;

	Image img;

</ccomsinglethreadmodel>


Everything goes fine and I can get the whole object but the BSTR types. Floats and integers are properly sent and received. But the BSTR types dont work. I'm trying to send strings and can't find the way. I did try with VARIANT instead and the result was wrong too. Somehow, it looks like the strings are not serialized.

These are some of the get and set functions for my ATL component:

This one works fine:
STDMETHODIMP CAnalisis::getLight(FLOAT* light)
{
	
	*light=img.light;
	return S_OK;
}

STDMETHODIMP CAnalisis::setLight(FLOAT light)
{
	img.light=light;
	return S_OK;
}


This one doesn't :

STDMETHODIMP CAnalisis::getImgName(BSTR* imgName)
{
	*imgName = img.imgName;

	return S_OK;
}

STDMETHODIMP CAnalisis::setImgName(BSTR imgName)
{
	
	img.imgName=imgName;
	return S_OK;
}


and this is the way I create the MSMQ message and fill the values in my producer :

// For these ActiveX components we need only smart interface pointer
		IMSMQQueueInfosPtr	pQueueInfos; 
		IMSMQQueueInfoPtr	pQueueInfo; 
		IMSMQQueuePtr		pQueue;
		IUnknownPtr			pIUnknown;
		// Instanciate the follwing ActiveX components
		IMSMQQueryPtr		pQuery(__uuidof(MSMQQuery));
		IMSMQMessagePtr		pMessage(__uuidof(MSMQMessage));
		

		IAnalisisPtr pAnalisis(__uuidof(Analisis));

                WCHAR *  imagen;		
		imagen = L"imagen1.jpg";
                pAnalisis->setImgName(imagen);

                
                 (...)

                pAnalisis->setFruitSize(20.00);

                 (...)
                 
                pQueueInfo = new IMSMQQueueInfoPtr( __uuidof(MSMQQueueInfo) );
			
		pQueueInfo->PathName = "MYCOMPUTER\\private$\\myprivatequeue";
		
	        pQueue = pQueueInfo->Open(MQ_SEND_ACCESS, MQ_DENY_NONE);
		pMessage->Body = static_cast<iunknown*>(pAnalisis);
                pMessage->Send(pQueue);


If I get the BSTR value in the producer (before serialization), pAnalisis-getImgName(), it works fine. In contrast, when I try to get it in the consumer, after reading the message from the queue, it doesn't return anything. The other values, such as the size, are returned with no trouble.

The thing is: does anyone know how to send a BSTR value inside a COM object through MSMQ ?

I've tried to find some similar examples but unfortunately totally in vain.

PLEASE HELP!!!

thanks.
AnswerRe: send a COM object with a BSTR value type in a MSMQ message Pin
Jonathan Davies9-Mar-09 7:59
Jonathan Davies9-Mar-09 7:59 
GeneralRe: send a COM object with a BSTR value type in a MSMQ message [modified] Pin
jxtamarc10-Mar-09 4:43
jxtamarc10-Mar-09 4:43 
GeneralRe: send a COM object with a BSTR value type in a MSMQ message Pin
Jonathan Davies10-Mar-09 23:53
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GeneralRe: send a COM object with a BSTR value type in a MSMQ message Pin
jxtamarc11-Mar-09 0:59
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