BufferCB and SampleCB not getting called

[Johnson]

Hi,
BufferCB and SampleCB not getting called . Any reason for this?This is how
I implemented.
class MySampleGrabberCB : public ISampleGrabberCB
{
STDMETHODIMP BufferCB( double dblSampleTime, BYTE * pBuffer, long
lBufferSize )
{
}
}

This is how I set Callback.
pGrabber->SetCallback( &CB ,2);

[Alessandro Angeli]

From: "Johnson"

Where are the IUnknown methods? Where is SampleCB()? What is
CB? How does that code even compile? What's your graph's
topology? Is your graph running?

--
// Alessandro Angeli
// MVP :: DirectShow / MediaFoundation
// mvpnews at riseoftheants dot com
// http://www.riseoftheants.com/mmx/faq.htm

[mtsay]

> pGrabber->SetCallback( &CB ,2);

If I'm not mistaken, the valid values for the 2nd parameter are 0 and
1.

[Tim Roberts]

"Johnson" <Joh...@gmail.com> wrote:
>Hi,
>BufferCB and SampleCB not getting called . Any reason for this? This is how

>I implemented.
>class MySampleGrabberCB : public ISampleGrabberCB
>{
> STDMETHODIMP BufferCB( double dblSampleTime, BYTE * pBuffer, long
>lBufferSize )
> {
> }
>}
>
>This is how I set Callback.
>pGrabber->SetCallback( &CB ,2);

And what do you think the "2" means there?
--
Tim Roberts, ti...@probo.com
Providenza & Boekelheide, Inc.

[Johnson]

Hi , Thanks for you response.. Whatever code given was part the application.
It was building fine.

I found the problem..In the sample header <qedit.h> included like this .
#define CINTERFACE
#include <qedit.h>

This is forcing to access IsampleGrabber object like this.
pGrabber->vtbl->SetCallback(&CB,2) . Now I commented "#define CINTERFACE".It
is fine.For each frame SampleCB or BufferCB is getting called based on
parameter.
I should have given this code directly. I thought problem is not in vtbl.

Thanks.

"Johnson" <Joh...@gmail.com> wrote in message
news:ORfHxGXf...@TK2MSFTNGP02.phx.gbl...

[Johnson]

Yes.. you are right.. As 0 and 1 values crashed that line of code. I tried
with 2. It did not crash.

"mtsay" <silent...@gmail.com> wrote in message
news:b44b6bf6-c455-4a62...@p32g2000vbi.googlegroups.com...