"Mocha" <john...@hotmail.com> wrote in message

> Hi,

> I am writing a MPEG playback app that requires to set the
> properties inside the MPEG Audio Decoder filter.  This
> filter has different properties such as Channels (First,
> Second and Both).  Please help me if you show me any
> guideline to change these values.  Thanks in advance.

> John

>-----Original Message-----
>This filter does not support any standard or documented

>to programmatically set its properties. The only

>ISpecifyPropertyPages which is used by the host

>property dialog as GraphEdit and WMP6.4 do.

>1. You can create the individual IPropertyPage you need
with
>CoCreateInstance() (you can discover its CLSID looking
into the array
>returned by ISpecifyPropertyPages::GetPages() and

>description in the registry).
>2. Initialize it passing a dummy IPropertyPageSite to
>IPropertyPage::SetPageSite() and a pointer to the
IBaseFilter in
>SetObjects().
>3. Activate() it with a hidden HWND (or any other one,
use a 1x1 RECT) but
>don't Show() it.
>4. Now you can use FindWindowEx() to walk the windows'

>IPropertyPage panel and its components which state you
need to change, so
>that you can SendMessage() to them to set their state and
then SendMessage()
>the panel to notify it of the changes.
>5. In the end, Apply() and release everything.

>This works fine with the filter I tried.

>"Mocha" <john...@hotmail.com> wrote in message
>news:1872f01c22fb9$21dc82f0$36ef2ecf@tkmsftngxa12...
>> Hi,

>> I am writing a MPEG playback app that requires to set
the
>> properties inside the MPEG Audio Decoder filter.  This
>> filter has different properties such as Channels (First,
>> Second and Both).  Please help me if you show me any
>> guideline to change these values.  Thanks in advance.

>> John

>.

"Mocha" <john...@hotmail.com> wrote in message

> Alessandro,

> I am very appreciated for your detail instructions to my
> question.  I will try to implement your method.  If you
> don't mind to do me another big favor, would you please
> send me your code example to help guide me in the right
> direction?  Thank you again.

> John

> >-----Original Message-----
> >This filter does not support any standard or documented
> custom COM interface
> >to programmatically set its properties. The only
> interface it supports is
> >ISpecifyPropertyPages which is used by the host
> application to create the
> >property dialog as GraphEdit and WMP6.4 do.

> >1. You can create the individual IPropertyPage you need
> with
> >CoCreateInstance() (you can discover its CLSID looking
> into the array
> >returned by ISpecifyPropertyPages::GetPages() and
> matching it with the
> >description in the registry).
> >2. Initialize it passing a dummy IPropertyPageSite to
> >IPropertyPage::SetPageSite() and a pointer to the
> IBaseFilter in
> >SetObjects().
> >3. Activate() it with a hidden HWND (or any other one,
> use a 1x1 RECT) but
> >don't Show() it.
> >4. Now you can use FindWindowEx() to walk the windows'
> hierarchy to find the
> >IPropertyPage panel and its components which state you
> need to change, so
> >that you can SendMessage() to them to set their state and
> then SendMessage()
> >the panel to notify it of the changes.
> >5. In the end, Apply() and release everything.

> >This works fine with the filter I tried.

> >"Mocha" <john...@hotmail.com> wrote in message
> >news:1872f01c22fb9$21dc82f0$36ef2ecf@tkmsftngxa12...
> >> Hi,

> >> I am writing a MPEG playback app that requires to set
> the
> >> properties inside the MPEG Audio Decoder filter.  This
> >> filter has different properties such as Channels (First,
> >> Second and Both).  Please help me if you show me any
> >> guideline to change these values.  Thanks in advance.

> >> John

> >.

>-----Original Message-----
>Here is an extract from my code that would check a

>of the property page and the classes or atoms of the
page and checkmark
>window are known (you have to find out these values using
>ISpecifyPropertyPages::GetPages() and walking the window
hierarchy).

>"Mocha" <john...@hotmail.com> wrote in message
>news:17d6d01c23094$98c92f90$a5e62ecf@tkmsftngxa07...
>> Alessandro,

>> I am very appreciated for your detail instructions to
my
>> question.  I will try to implement your method.  If you
>> don't mind to do me another big favor, would you please
>> send me your code example to help guide me in the right
>> direction?  Thank you again.

>> John

>> >-----Original Message-----
>> >This filter does not support any standard or
documented
>> custom COM interface
>> >to programmatically set its properties. The only
>> interface it supports is
>> >ISpecifyPropertyPages which is used by the host
>> application to create the
>> >property dialog as GraphEdit and WMP6.4 do.

>> >1. You can create the individual IPropertyPage you
need
>> with
>> >CoCreateInstance() (you can discover its CLSID looking
>> into the array
>> >returned by ISpecifyPropertyPages::GetPages() and
>> matching it with the
>> >description in the registry).
>> >2. Initialize it passing a dummy IPropertyPageSite to
>> >IPropertyPage::SetPageSite() and a pointer to the
>> IBaseFilter in
>> >SetObjects().
>> >3. Activate() it with a hidden HWND (or any other one,
>> use a 1x1 RECT) but
>> >don't Show() it.
>> >4. Now you can use FindWindowEx() to walk the windows'
>> hierarchy to find the
>> >IPropertyPage panel and its components which state you
>> need to change, so
>> >that you can SendMessage() to them to set their state
and
>> then SendMessage()
>> >the panel to notify it of the changes.
>> >5. In the end, Apply() and release everything.

>> >This works fine with the filter I tried.

>> >"Mocha" <john...@hotmail.com> wrote in message
>> >news:1872f01c22fb9$21dc82f0$36ef2ecf@tkmsftngxa12...
>> >> Hi,

>> >> I am writing a MPEG playback app that requires to
set
>> the
>> >> properties inside the MPEG Audio Decoder filter.  
This
>> >> filter has different properties such as Channels
(First,
>> >> Second and Both).  Please help me if you show me any
>> >> guideline to change these values.  Thanks in
advance.

>> >> John

>> >.