Generated C++ code fails to enumerate pins

[equinox]

Hi,

My filter graph works great in GraphEditPlus 1.2.2.
However, the generated C++ code always fail to enumerate pins

pPin is always 0x00000000 in the function GetPin(...) so while(pEnum->Next(1, &pPin, 0) == S_OK) returns immediately and goes to printf("Pin not found!\n");

This scenario repeats itself for any C++ code I generate, no matter what the filter graph is.

Any idea what is wrong?

Thanks,
Equinox

[Dee Mon]

You should see what pEnum->Next returns, this may show the reason.

[Vittorio]

This sort of problem can occure for example if the development and deployment happen in the different language environments. E.g. if the Windows version you use for development is the English one, the GraphEdit generates the pin name "Capture" or whatever. If you run the generated program in the Italian run-time environment, the name of the pin exposed by the same filter will be totally different and the lookup for the pin called "Captuer" fails.

[JohnC]

Wasn't aware of the issue raised by Vittorio. but the following code may help. It uses the IGraphbuilder2 FindPin to look explicitly for the Capture pin on a base filter.

Code:

CComPtr<IPin> GetCapturePin(ICaptureGraphBuilder2* pGraphBuilder, IBaseFilter* pFilter)
{
CComPtr<IPin> pPin;

HRESULT hr = pGraphBuilder->FindPin(pFilter, PINDIR_OUTPUT, &PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,FALSE, 0, &pPin);
CHECK_HR(hr, _T("Unable to Create the FilterGraph"))

return pPin;
}