Re: How to add a filter?

I am trying to make it manually as I have been reading the docs and the
first step is to write this line(adding the filter I want to insert
between the two I already have):

hr = AddFilterByCLSID(pGraph, CLSID_CsSobelV2, L"Sobel", &pSobel);

I only wrote this line (declaring first: IBaseFilter *pSobel = NULL;)
and I get the fllowing errors:

1>d:\alex\curro\directshow\ya_funciona\webcam.cpp(42) : error C2065:
'CLSID_CsSobelV2' : undeclared identifier

1>d:\alex\curro\directshow\ya_funciona\webcam.cpp(42) : error C3861:
'AddFilterByCLSID': identifier not found

What am I doing wrong?
Thank you

.

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