> I am trying to create a screen capturing application, this app shouldaccess
> the screen memory compress it and send it through TCP/IP, What is the bestkernel
> way of getting a direct pointer to the screen memory, Should I use a
> filter/function driver????There is much more reliable way for doing this.
>If all you want is a single snapshot, you don't need kernel help at all.
>I am trying to create a screen capturing application, this app should access
>the screen memory compress it and send it through TCP/IP, What is the best
>way of getting a direct pointer to the screen memory, Should I use a kernel
>filter/function driver????
> "Nadav" <not@today> wrote:access> >
> >I am trying to create a screen capturing application, this app should
best> >the screen memory compress it and send it through TCP/IP, What is the
kernel> >way of getting a direct pointer to the screen memory, Should I use a
> >filter/function driver????>
> If all you want is a single snapshot, you don't need kernel help at all.
> You can use DirectX to get a pointer to the primary display surface.
>
> - Tim Roberts, timr@probo.com
> Providenza & Boekelheide, Inc
> Actually what I am trying to do is to create a screen-capture 'codec' thatby
> will enable streaming the screen over the net, the current codec supplied
> Microsoft gives good compression ratio BUT consumes allot of CPU, My first
> concern is that the CPU cost will not be above 10% of the CPU the
> compression ratio, is my second priority, I guess I have no other
> alternatives but to write a kernel driver...
>
> "Tim Roberts" <timr@probo.com> wrote in message
> news:jd3quvkvogcabgaogurnhp6hmr3eqg2jhl@4ax.com...> > "Nadav" <not@today> wrote:> access> > >
> > >I am trying to create a screen capturing application, this app should> best> > >the screen memory compress it and send it through TCP/IP, What is the> kernel> > >way of getting a direct pointer to the screen memory, Should I use a>> > >filter/function driver????> >
> > If all you want is a single snapshot, you don't need kernel help at all.
> > You can use DirectX to get a pointer to the primary display surface.
> >
> > - Tim Roberts, timr@probo.com
> > Providenza & Boekelheide, Inc
>
>best
> Hi, Nadav
>> > I am trying to create a screen capturing application, this app should> access> > the screen memory compress it and send it through TCP/IP, What is the
> > way of getting a direct pointer to the screen memory, Should I use a> kernel> > filter/function driver????>
> There is much more reliable way for doing this.
> Search Windows DDK for Mirror Display Drivers.
>
> --------------------
> Lev Kazarkin
> Mirror drivers. Consulting and custom development.
>
>
> Actually what I am trying to do is to create a screen-capture 'codec' thatby
> will enable streaming the screen over the net, the current codec supplied
> Microsoft gives good compression ratio BUT consumes allot of CPU, My first
> concern is that the CPU cost will not be above 10% of the CPU the
> compression ratio, is my second priority, I guess I have no other
> alternatives but to write a kernel driver...
>
> "Tim Roberts" <timr@probo.com> wrote in message
> news:jd3quvkvogcabgaogurnhp6hmr3eqg2jhl@4ax.com...> > "Nadav" <not@today> wrote:> access> > >
> > >I am trying to create a screen capturing application, this app should> best> > >the screen memory compress it and send it through TCP/IP, What is the> kernel> > >way of getting a direct pointer to the screen memory, Should I use a>> > >filter/function driver????> >
> > If all you want is a single snapshot, you don't need kernel help at all.
> > You can use DirectX to get a pointer to the primary display surface.
> >
> > - Tim Roberts, timr@probo.com
> > Providenza & Boekelheide, Inc
>
> why do you think it shouldnt consume more than 10%, given that encode isthat
> almost always more expensive than decode?
>
> have you tested with a variety of CPU and memory configs? or do you have a
> single sample in your sample set to base that conclusion upon?
>
> "Nadav" <not@today> wrote in message
> news:%23McpsNGzDHA.2780@TK2MSFTNGP09.phx.gbl...> > Actually what I am trying to do is to create a screen-capture 'codec'
supplied> > will enable streaming the screen over the net, the current codec
> byfirst> > Microsoft gives good compression ratio BUT consumes allot of CPU, My
all.> > concern is that the CPU cost will not be above 10% of the CPU the
> > compression ratio, is my second priority, I guess I have no other
> > alternatives but to write a kernel driver...
> >
> > "Tim Roberts" <timr@probo.com> wrote in message
> > news:jd3quvkvogcabgaogurnhp6hmr3eqg2jhl@4ax.com...> > > "Nadav" <not@today> wrote:> > access
> > > >
> > > >I am trying to create a screen capturing application, this app should> > > >the screen memory compress it and send it through TCP/IP, What is the> > best> > > >way of getting a direct pointer to the screen memory, Should I use a> > kernel> > > >filter/function driver????
> > >
> > > If all you want is a single snapshot, you don't need kernel help at
>> > > You can use DirectX to get a pointer to the primary display surface.> >
> > >
> > > - Tim Roberts, timr@probo.com
> > > Providenza & Boekelheide, Inc
> >
>
>It's not just compression. Just the fact that you're using a mirror driver
>Well, Netopia ( Timbuktu SDK, http://www.netopia.com ) uses a mirror device
>( I guess ) to encode ( on runtime ) screen capture, and it costs about 10%
>of the CPU which results a bad compression ratio, but still... when CPU
>Consumption is the first priority.....
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