Source filter - property page in Matlab

Question

Hello.

I'm developing my own source filter. I can display property page in programs like AMCap, GraphEdit, but I cannot in Matlab. I found out that Matlab never calls GetPages method or constructor of my property page. It doesn't even querying for property page:

STDMETHODIMP CVCam::NonDelegatingQueryInterface(REFIID riid, void **ppv)
{
	append_to_file("CVCam NonDelegatingQueryInterface");
	CheckPointer(ppv,E_POINTER);

    if (riid == IID_ISpecifyPropertyPages)
    {
		append_to_file("IID_ISpecifyPropertyPages"); // this is never called
		return GetInterface((ISpecifyPropertyPages *) this, ppv);
    }
    else
        return CSource::NonDelegatingQueryInterface(riid, ppv);
}

Matlab never query for "riid == IID_ISpecifyPropertyPages".

Maybe the problem might be in dll regsvr? Here is the code:

//////////////////////////////////////////////////////////////////////////
//  This file contains routines to register / Unregister the 
//  Directshow filter
//  We do not use the inbuilt BaseClasses routines as we need to register as
//  a capture source
//////////////////////////////////////////////////////////////////////////
#pragma comment(lib, "kernel32")
#pragma comment(lib, "user32")
#pragma comment(lib, "gdi32")
#pragma comment(lib, "advapi32")
#pragma comment(lib, "winmm")
#pragma comment(lib, "ole32")
#pragma comment(lib, "oleaut32")

#ifdef _DEBUG
    #pragma comment(lib, "strmbasd")
#else
    #pragma comment(lib, "strmbase")
#endif


#include <streams.h>
#include <olectl.h>
#include <initguid.h>
#include <dllsetup.h>
#include "filters.h"


#define CreateComObject(clsid, iid, var) CoCreateInstance( clsid, NULL, CLSCTX_INPROC_SERVER, iid, (void **)&var);

STDAPI AMovieSetupRegisterServer( CLSID   clsServer, LPCWSTR szDescription, LPCWSTR szFileName, LPCWSTR szThreadingModel = L"Both", LPCWSTR szServerType     = L"InprocServer32" );
STDAPI AMovieSetupUnregisterServer( CLSID clsServer );



// {C18E8F1C-F18D-4DDB-B559-58EF23A8C1B6}
DEFINE_GUID(CLSID_OptoMCam, 
0xc18e8f1c, 0xf18d, 0x4ddb, 0xb5, 0x59, 0x58, 0xef, 0x23, 0xa8, 0xc1, 0xb6);



const AMOVIESETUP_MEDIATYPE AMSMediaTypesVCam = 
{ 
    &MEDIATYPE_Video, 
    &MEDIASUBTYPE_NULL 
};

const AMOVIESETUP_PIN AMSPinVCam=
{
    L"Output",             // Pin string name
    FALSE,                 // Is it rendered
    TRUE,                  // Is it an output
    FALSE,                 // Can we have none
    FALSE,                 // Can we have many
    &CLSID_NULL,           // Connects to filter
    NULL,                  // Connects to pin
    1,                     // Number of types
    &AMSMediaTypesVCam      // Pin Media types
};

const AMOVIESETUP_FILTER AMSFilterVCam =
{
    &CLSID_OptoMCam,  // Filter CLSID
    L"example camera",     // String name
    MERIT_DO_NOT_USE,      // Filter merit
    2,                     // Number pins
    &AMSPinVCam             // Pin details
};

CFactoryTemplate g_Templates[] = 
{
    {
        L"example camera",
        &CLSID_OptoMCam,
        CVCam::CreateInstance,
        NULL,
        &AMSFilterVCam
    },
	// This entry is for the property page.
    { 
        L"example camera properties",
        &CLSID_property_pages,
        CAMproperty::CreateInstance,
		NULL, NULL
    }

};

int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);




STDAPI RegisterFilters( BOOL bRegister )
{
    HRESULT hr = NOERROR;
    WCHAR achFileName[MAX_PATH];
    char achTemp[MAX_PATH];
    ASSERT(g_hInst != 0);

    if( 0 == GetModuleFileNameA(g_hInst, achTemp, sizeof(achTemp))) 
        return AmHresultFromWin32(GetLastError());

    MultiByteToWideChar(CP_ACP, 0L, achTemp, lstrlenA(achTemp) + 1, 
                       achFileName, NUMELMS(achFileName));

	//property pages
	WCHAR achFileName2[MAX_PATH];
    char achTemp2[MAX_PATH];

    if( 0 == GetModuleFileNameA(g_hInst, achTemp2, sizeof(achTemp2))) 
        return AmHresultFromWin32(GetLastError());

    MultiByteToWideChar(CP_ACP, 0L, achTemp2, lstrlenA(achTemp2) + 1, 
                       achFileName2, NUMELMS(achFileName2));
	//END property pages
  
    hr = CoInitialize(0);
    if(bRegister)
    {
        hr = AMovieSetupRegisterServer(CLSID_OptoMCam, L"example camera", achFileName, L"Both", L"InprocServer32");
		AMovieSetupRegisterServer(CLSID_property_pages, L"example camera properties", achFileName2, L"Both", L"InprocServer32");
    }

    if( SUCCEEDED(hr) )
    {
        IFilterMapper2 *fm = 0;
        hr = CreateComObject( CLSID_FilterMapper2, IID_IFilterMapper2, fm );
        if( SUCCEEDED(hr) )
        {
            if(bRegister)
            {
                IMoniker *pMoniker = 0;
                REGFILTER2 rf2;
                rf2.dwVersion = 1;
                rf2.dwMerit = MERIT_DO_NOT_USE;
                rf2.cPins = 1; // debug
                rf2.rgPins = &AMSPinVCam;
                hr = fm->RegisterFilter(CLSID_OptoMCam, L"example camera", &pMoniker, &CLSID_VideoInputDeviceCategory, NULL, &rf2);
            }
            else
            {
                hr = fm->UnregisterFilter(&CLSID_VideoInputDeviceCategory, 0, CLSID_OptoMCam);
            }
        }

      // release interface
      //
      if(fm)
          fm->Release();
    }

    if( SUCCEEDED(hr) && !bRegister )
	{
        hr = AMovieSetupUnregisterServer( CLSID_OptoMCam );
		AMovieSetupUnregisterServer( CLSID_property_pages );
	}

    CoFreeUnusedLibraries();
    CoUninitialize();
    return hr;
}

STDAPI DllRegisterServer()
{
    return RegisterFilters(TRUE);
}

STDAPI DllUnregisterServer()
{
    return RegisterFilters(FALSE);
}

extern "C" BOOL WINAPI DllEntryPoint(HINSTANCE, ULONG, LPVOID);

BOOL APIENTRY DllMain(HANDLE hModule, DWORD  dwReason, LPVOID lpReserved)
{
	return DllEntryPoint((HINSTANCE)(hModule), dwReason, lpReserved);
}

Answer 1

Some apps prefer to provide their own UI, in which case they do not query for pages attached to a filter. This might be your case. Also, the application might be querying pin for pages, not the filter - you might want to check this out as well.

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http://alax.info/blog/tag/directshow