Configure Video Parameters

Hi!

I am doing a ATL Project to control the video parameters of a camera: brightness, hue, saturation, ... I dont want to use the ISpecifyPropertyPages, because I just want to allow the final user to control some settings, so I'm using IAMVideoProcAmp (http://msdn.microsoft.com/en-us/libr...=vs.85%29.aspx), but it's not working.

I added a method to the class called start just to test this feature:

Code:

---

STDMETHODIMP CTest::start(void)
{
    IBaseFilter * sourceFilter;
    HRESULT hr;

    ICreateDevEnum *pCreateDevEnum=0;
    hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
                          IID_ICreateDevEnum, (void**)&pCreateDevEnum);
    if(hr != NOERROR)
    {
        MessageBox(NULL, L"Error Creating Device Enumerator", NULL, NULL);
    }

    IEnumMoniker *pEm=0;
    hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0);
    if(hr != NOERROR)
    {
        MessageBox(NULL, L"Sorry, you have no video capture hardware.\r\n\r\nVideo capture will not function properly.", NULL, NULL);
    }

    pEm->Reset();
    ULONG cFetched;
    IMoniker *pM;

    while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)
    {
        IPropertyBag *pBag=0;

        hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
        if(SUCCEEDED(hr))
        {
            VARIANT var;
            var.vt = VT_BSTR;
            hr = pBag->Read(L"FriendlyName", &var, NULL);
            if(hr == NOERROR)
            {
               
                SysFreeString(var.bstrVal);

             
            }

            pBag->Release();

        }

        hr = pM->BindToObject(0, 0, IID_IBaseFilter, (void**)&sourceFilter);

        if(FAILED(hr)) {

                MessageBox(NULL, L"Unable to bind...", NULL, NULL);

        } else {

                IAMVideoProcAmp * cenas;
                hr = sourceFilter->QueryInterface(IID_IAMVideoProcAmp, (void**)&cenas);

                if(FAILED(hr)) {

                        MessageBox(NULL, L"Couldn't get interface", NULL, NULL);

                } else {

                        LONG min, max, ste, def, fla;
                        hr = cenas->GetRange(VideoProcAmp_Brightness, &min, &max, &ste, &def, &fla);

                        if(FAILED(hr)) {

                                MessageBox(NULL, L"The device does not support this property", NULL, NULL);

                        }

                }

        }

        pM->Release();

    }

    pEm->Release();

    return S_OK;

}

---

Using this code I always get the message box telling me "The device does not support this property". I also tried other properties, but I get always that message box.

When I use GraphEditPlus, I'm able to see the properties page and change the values.

What Am I doing wrong?