Virtual Display Driver
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From: peter7577 on 6 May 2008 09:07 Hi I would like to be able to have a fullscreen application use a virtual display driver, from which you can do screen capture. That way the normal monitor/display would not be in full screen mode and can be used normally. Regards Peter
From: Joseph M. Newcomer on 6 May 2008 09:57 Depends on what you are really asking for. For example, if all you want to do is capture the client area of the screen, I have a simple function on my MVP TIps site that captures the client area of a window (note: if other windows are on top, it captures them). Or, if you want to generate a "full-screen-sized" bitmap, you can simply create a bitmap as large as the screen, selected it into a DC, and call your DrawItem method to paint into the bitmap (even though it is larger than the current client area). You can find an example of this in my Gradient Fill Explorer, which is actually a dialog-based app and I want to capture a bitmap which is displayed in a scrollable window, but I want the whole bitmap. joe On Tue, 6 May 2008 06:07:40 -0700 (PDT), peter7577(a)gmail.com wrote: >Hi > >I would like to be able to have a fullscreen application use a virtual >display driver, from which you can do screen capture. >That way the normal monitor/display would not be in full screen mode >and can be used normally. > > >Regards Peter Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
From: Giovanni Dicanio on 6 May 2008 11:27 "Joseph M. Newcomer" <newcomer(a)flounder.com> ha scritto nel messaggio news:uoo024lqkmgnv2nmj6j7po5etk2dj8fm2o(a)4ax.com... > Depends on what you are really asking for. For example, if all you want > to do is capture > the client area of the screen, I have a simple function on my MVP TIps > site that captures > the client area of a window (note: if other windows are on top, it > captures them). If the client area hosts some DirectX (DirectDraw) surfaces, that function does not capture its content. I think that the OP needs something at very low level inside Windows architecture, maybe at the device-driver level. Joe: in this field you are the expert (I have no detailed ideas about device driver development). I would also suggest the OP to visit some device-driver related newsgroup to post his question... Giovanni
From: Joseph M. Newcomer on 7 May 2008 00:00 Virtual display drivers are nontrivial creations. There is insufficient information in the question to give a good answer (for example, if DirectX were involved, this surely would have been mentioned in the question...). I have never used DirectX, but it would surprise me if it didn't have a way to capture screen information, but this is probably the wrong forum to pose that sort of question. joe On Tue, 6 May 2008 17:27:49 +0200, "Giovanni Dicanio" <giovanni.dicanio(a)invalid.com> wrote: > >"Joseph M. Newcomer" <newcomer(a)flounder.com> ha scritto nel messaggio >news:uoo024lqkmgnv2nmj6j7po5etk2dj8fm2o(a)4ax.com... >> Depends on what you are really asking for. For example, if all you want >> to do is capture >> the client area of the screen, I have a simple function on my MVP TIps >> site that captures >> the client area of a window (note: if other windows are on top, it >> captures them). > >If the client area hosts some DirectX (DirectDraw) surfaces, that function >does not capture its content. > >I think that the OP needs something at very low level inside Windows >architecture, maybe at the device-driver level. >Joe: in this field you are the expert (I have no detailed ideas about device >driver development). > >I would also suggest the OP to visit some device-driver related newsgroup to >post his question... > >Giovanni > Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
From: peter7577 on 7 May 2008 03:56
Thanks for your replies. DirectX is not involved. I might be able to use your example, but many applications only update the visible area so in a scrollable window only the visible part can be captured. Since the window is updated by an external application there is no way of telling when it has finished updating after window has been scrolled; which is why I thought of a virtual display. Creating a virtual display is a lot of work, so I was hoping that there might be something buried in Platform SDK or the DDK or a open source project that does some thing like this. Peter On 7 Maj, 06:00, Joseph M. Newcomer <newco...(a)flounder.com> wrote: > Virtual display drivers are nontrivial creations. > > There is insufficient information in the question to give a good answer (for example, if > DirectX were involved, this surely would have been mentioned in the question...). I have > never used DirectX, but it would surprise me if it didn't have a way to capture screen > information, but this is probably the wrong forum to pose that sort of question. > joe > > On Tue, 6 May 2008 17:27:49 +0200, "Giovanni Dicanio" <giovanni.dica...(a)invalid.com> > wrote: > > > > > > >"Joseph M. Newcomer" <newco...(a)flounder.com> ha scritto nel messaggio > >news:uoo024lqkmgnv2nmj6j7po5etk2dj8fm2o(a)4ax.com... > >> Depends on what you are really asking for. For example, if all you want > >> to do is capture > >> the client area of the screen, I have a simple function on my MVP TIps > >> site that captures > >> the client area of a window (note: if other windows are on top, it > >> captures them). > > >If the client area hosts some DirectX (DirectDraw) surfaces, that function > >does not capture its content. > > >I think that the OP needs something at very low level inside Windows > >architecture, maybe at the device-driver level. > >Joe: in this field you are the expert (I have no detailed ideas about device > >driver development). > > >I would also suggest the OP to visit some device-driver related newsgroup to > >post his question... > > >Giovanni > > Joseph M. Newcomer [MVP] > email: newco...(a)flounder.com > Web:http://www.flounder.com > MVP Tips:http://www.flounder.com/mvp_tips.htm |