Re: IQueryInfo: GetInfoTip() - How get the default Window tip text? [modified] - COM Discussion Boards

2-Oct-09 4:16

Hi All,

now I get connected in my main.cpp file to the server. I hope this will be correct. But how can I get now an event from the server? The server sends some events. I can see that because an Message Dialog will be opened from the server.

Now my questions are the following:

a)
Is the code until now correct? Is it possible to make a test if I get the correct connection or anything else?

b)
How can I get in the main.cpp an event (OnShowMessageDlg) or any message from the server? Do I need to add something to the sink class?

c)
Must I add something in the Sink class to get the an event in the invoke function? Or how should this work?

Let me know If you need any more information.

Once more, thanks for any help.

Juergen

main.cpp File

CComPtr<ICWOLE2> tCWOLE;
HRESULT hr;
hr = CoInitialize(0);

hr = CoCreateInstance(CLSID_CWOLEv2, 0, CLSCTX_LOCAL_SERVER, IID_ICWOLE2, (void**)&tCWOLE);
IConnectionPointContainer   * pConnPtContainer;
hr = tCWOLE->QueryInterface(IID_IConnectionPointContainer,(void**)&pConnPtContainer);
if(FAILED(hr)){
	CoUninitialize();
	return false;
}
CComPtr<IConnectionPoint> ICPoint;
hr = pConnPtContainer->FindConnectionPoint(DIID_ICWOLEEvents,&m_pConnectionPoint);
if(FAILED(hr)){
	CoUninitialize();
	return false;
}

m_sink = new CSink;
LPUNKNOWN pUnk = NULL;
m_sink->QueryInterface(IID_IUnknown,(void**)&pUnk);
hr = m_pConnectionPoint->Advise(pUnk,&m_sink->cookie);
if(FAILED(hr)){
	CoUninitialize();
	return false;
}
pConnPtContainer->Release();
.
.
.
// Here I must get the event from the COM Server, but how can this be done???
// How can I test if I get the information from the correct class??
.
.
.

m_pConnectionPoint->Unadvise(m_sink->cookie);
m_pConnectionPoint->Release();
m_sink->Release();

CSink.h

class CSink : public ICWOLEEvents
{
	public:
		
		CSink::CSink() {m_refCount = 1, cookie = 0;}
		CSink::~CSink()	{}
		
		STDMETHODIMP QueryInterface(REFIID riid, void ** ppvObj); //HRESULT _stdcall
		STDMETHODIMP_(ULONG) AddRef();  // Note the underscore
		STDMETHODIMP_(ULONG) Release();
	
		
		STDMETHODIMP GetTypeInfoCount(UINT *iTInfo);
		STDMETHODIMP GetTypeInfo(UINT iTInfo, LCID lcid, ITypeInfo **ppTInfo);
		STDMETHODIMP GetIDsOfNames(REFIID riid, OLECHAR **rgszNames, UINT cNames,  LCID lcid, DISPID *rgDispId);
		STDMETHODIMP Invoke(DISPID dispIdMember, 
							REFIID riid, 
							LCID lcid,
							WORD wFlags, DISPPARAMS* pDispParams,
							VARIANT* pVarResult, EXCEPINFO* pExcepInfo,
							UINT* puArgErr);
		
		
		
    public:
		int m_refCount;
		DWORD cookie;
		//void OnConfigurationApply(VARIANT_BOOL *pAccept);
		void OnShowMessageDlg(IMsgDlg *pIMsg, VARIANT_BOOL *Result);

};

CSink.cpp

HRESULT CSink::QueryInterface(REFIID riid, void ** ppvObj)
{

	if (riid == IID_IUnknown){
		*ppvObj = static_cast<void*>(this);
	}
	
	else if (riid == DIID_ICWOLEEvents){
		*ppvObj = static_cast<ICWOLEEvents*>(this);
	}
	else if (riid == IID_IDispatch){
		*ppvObj = static_cast<IDispatch*>(this);
	}
	
	else
	{
	    char clsidStr[256];
	    WCHAR wClsidStr[256];
	    char txt[512];
		
	    StringFromGUID2(riid, (LPOLESTR)&wClsidStr, 256);
		
	    // Convert down to ANSI
	    WideCharToMultiByte(CP_ACP, 0, wClsidStr, -1, clsidStr, 256, NULL, NULL);
		
	    sprintf(txt, "riid is : %s: Unsupported Interface", clsidStr);
		
		*ppvObj = NULL;
		return E_NOINTERFACE;
	}
	
	static_cast<IUnknown*>(*ppvObj)->AddRef();
	return S_OK;
}
/******************************************************************************/
STDMETHODIMP_(ULONG) CSink::AddRef()
{
	return ++m_refCount;
}
/******************************************************************************/
STDMETHODIMP_(ULONG) CSink::AddRef()
{
	return ++m_refCount;
}
/******************************************************************************/
STDMETHODIMP_(ULONG) CSink::Release()
{
	if (--m_refCount == 0)
	{
		delete this;
		return 0;
	}
	return m_refCount;
}
/******************************************************************************/
STDMETHODIMP CSink::GetTypeInfoCount(UINT *iTInfo)
{
	return E_NOTIMPL;
}
/******************************************************************************/
STDMETHODIMP CSink::GetTypeInfo(UINT iTInfo, LCID lcid, 
                                       ITypeInfo **ppTInfo)
{
	
	return E_NOTIMPL;
}
/******************************************************************************/
STDMETHODIMP CSink::GetIDsOfNames(REFIID riid,  
                                         OLECHAR **rgszNames, 
                                         UINT cNames,  LCID lcid,
                                         DISPID *rgDispId)
{
	HRESULT hr = E_FAIL;
	return hr;
}
/******************************************************************************/
STDMETHODIMP CSink::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid,
                                  WORD wFlags, DISPPARAMS* pDispParams,
                                  VARIANT* pVarResult, EXCEPINFO* pExcepInfo,
                                  UINT* puArgErr)
{

	if ((riid != IID_NULL))
		return E_INVALIDARG;
	
	HRESULT hr = S_OK;  // Initialize
	
	
	return hr;
}
/******************************************************************************/
void CSink::OnShowMessageDlg(IMsgDlg *pIMsg, VARIANT_BOOL *Result){
	// Is this correct???
}

Test.idl
// Generated .IDL file (by the OLE/COM Object Viewer)
//
// typelib filename: test_programm.exe

[
  uuid(90B4344B-90CD-4527-BC00-4F4D45C793D6),
  version(2.13),
  helpstring("CW  CWOLE")
]
library CW_CWOLE
{
    // TLib :     // TLib : OLE Automation : {00020430-0000-0000-C000-000000000046}
    importlib("stdole2.tlb");

    // Forward declare all types defined in this typelib
    interface ICWOLE2;
    dispinterface ICWOLEEvents;
.
.
.
.
.

    [
      uuid(6775FB91-B5BE-11D6-A996-0050BA24C7B9),
      version(1.1),
      helpstring("Event dispatch interface for CW CWOLE")
    ]
    dispinterface ICWOLEEvents {
        properties:
        methods:
            [id(0x00000001)]
            void OnConfigurationApply([in, out] VARIANT_BOOL* pAccept);
            [id(0x00000002)]
            void OnShowMessageDlg(
                            [in] IMsgDlg* pIMsg, 
                            [out, retval] VARIANT_BOOL* Result);
    };

    typedef [uuid(5CBBA151-1C47-4D6C-B14C-C527E333F812), version(1.2)]
    enum {
        ECS_DEFAULT = 0,
        ECS_FRONT = 1,
        ECS_LEFT = 2,
        ECS_RIGHT = 3,
        ECS_LEFTUP = 4,
        ECS_RIGHTUP = 5,
        ECS_TOP = 6,
        ECS_BACK = 7,
        ECS_BACKLEFTUP = 8,
        ECS_BACKRIGHTUP = 9,
        ECS_BOTTOM = 10
    } ECamSetup;

    typedef [uuid(9545E3CA-6401-4418-A040-DA3A89E2C792), version(1.3)]
    enum {
        EPM_PERSP = 0,
        EPM_ORTHO = 1,
        EPM_2D = 2
    } EProjectionMode;

    [
      uuid(F560F763-2948-11D7-A9BF-0050BA24C7B9),
      version(2.13),
      helpstring("CWOLE2")
    ]
    coclass CWOLEv2 {
        [default] interface ICWOLE2;
        [default, source] dispinterface ICWOLEEvents;
    };

Stuart Dootson2-Oct-09 5:46

2-Oct-09 5:46

Yes, you need to add code into the Invoke methods that looks at the dispid that's passed and maps that to the method you need to call. In addition, you need to unpack the parameter values from the struct pointed at by pDispParams.

Also, that thread needs to be in a window message dispatch loop - my understanding is that COM method calls are passed from other threads and processes into your thread using windows messages.

I know you can't/don't want to use ATL and I can totally understand that...but ATL does make this sort of thing REALLY easy Smile | :)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Juergen_804-Oct-09 22:55

4-Oct-09 22:55

Hi Stuart,

thanks a lot for your reply. Do you know if there will be an example about the invoke theme? I didn't know how this function will/must be called and how my functions then will be called / how I can get a message from the COM server above this invoke functions.

I know and I heared also from other people Smile | :)

that it will be easier to work with ATL. But in this project I can't use ATL.

Stuart Dootson5-Oct-09 0:00

5-Oct-09 0:00

OK - the Invoke method is called when an event is raised by the server. It will tell you which method it's calling using the dispidMember parameter. The parameters to the call will be in the structure pointed at by pdispparams. You can pass back a result in pvarResult.

So, you could implement your Invoke using a switch statement and parameter transformation like this:

STDMETHODIMP CSink::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid,
                           WORD wFlags, DISPPARAMS* pDispParams,
                           VARIANT* pVarResult, EXCEPINFO* pExcepInfo,
                           UINT* puArgErr)
{

   if ((riid != IID_NULL))
      return E_INVALIDARG;
   
   HRESULT hr = S_OK;  // Initialize
   
   switch (dispIdMember)
   {
      case 1: // OnConfigurationApply
         // Here we need to verify that the parameters passed are what we expect (a VARIANT_BOOL*)
         // then call the OnConfigurationApply with these passed parameters
         if (pDispParams->cArgs != 1) return E_INVALIDARG;
         if (V_VT(&pDispParams->rgvarg[0]) != VT_BOOL|VT_BYREF) return E_INVALIDARG;
         OnConfigurationApply(V_BOOLREF(&pDispParams->rgvarg[0]));
         break;
      case 2: // OnShowMessageDlg
         // Do as for OnConfigurationApply
         break;
   }
   
   return hr;
}

HTH!

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Juergen_805-Oct-09 0:07

5-Oct-09 0:07

The problem I have before is that the Invoke Function will not be called. What must I do that this function will be called from the Server when an event is raised?

I can see that an event is raised from the server because an dialog will be opended. But the invoke function will not be called.

Stuart Dootson5-Oct-09 0:15

5-Oct-09 0:15

Your code all looks reasonable - I presume you've set a breakpoint in your Invoke method to see if it gets called?

I'd also set breakpoints on your AddRef, QueryInterface methods and see if they get called when you call the connection point's Advise method - that's how you tell the server about your event handler.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Juergen_805-Oct-09 4:05

5-Oct-09 4:05

I set now also some breakpoints in the AddRef and QueryInterface Methods. These methods will be called. Only the Invoke function will not be called.

Do you know what I can do to test if I did something wrong or if the COM server works correct?

Stuart Dootson5-Oct-09 4:19