How can I find the currently visible desktop? By calling EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a way
to figure out which one of them is currently visible?
I've tried to find the visible desktop by comparing the desktop handle,
returned by the OpenDesktop function, to the desktop handle received by
calling OpenInputDeskto p. The result is that the default desktop is always
the one currently receiving user input.
But by using the default desktop my window always shows up at the desktop of
the first user logged on to the system after reboot. No matter if this
desktop is currently visible or not!
As a second attempt I've called GetUserObjectIn formation for each desktop
and checked the visible flag. But the result is there is no visible desktop
at all !?
What am I doing wrong? Or what is the right way to search for the currently
visible desktop?
15  3014 
Take a look at this blog entry, which explains why there is no "currentyl
visible desktop" http://blogs.msdn.com/oldnewthing/ar...22/712677.aspx
--
SvenC
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:40******** *************** ***********@mic rosoft.com...
How can I find the currently visible desktop? By calling
EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
I've tried to find the visible desktop by comparing the desktop handle,
returned by the OpenDesktop function, to the desktop handle received by
calling OpenInputDeskto p. The result is that the default desktop is always
the one currently receiving user input.
But by using the default desktop my window always shows up at the desktop
of
the first user logged on to the system after reboot. No matter if this
desktop is currently visible or not!
As a second attempt I've called GetUserObjectIn formation for each desktop
and checked the visible flag. But the result is there is no visible
desktop
at all !?
What am I doing wrong? Or what is the right way to search for the
currently
visible desktop?
Okay, let me rephrase my question more precisely:
I want the desktop currently visible at the display connected directly to
the computer. No remote or inactive desktops. And if there's more then one,
fine, which one of them are visible?
The main thing is: I need to find the desktop which currently has full
access to the graphic adapters hardware acceleration.
"SvenC" wrote:
Take a look at this blog entry, which explains why there is no "currentyl
visible desktop"
http://blogs.msdn.com/oldnewthing/ar...22/712677.aspx
--
SvenC
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:40******** *************** ***********@mic rosoft.com...
How can I find the currently visible desktop? By calling
EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
I've tried to find the visible desktop by comparing the desktop handle,
returned by the OpenDesktop function, to the desktop handle received by
calling OpenInputDeskto p. The result is that the default desktop is always
the one currently receiving user input.
But by using the default desktop my window always shows up at the desktop
of
the first user logged on to the system after reboot. No matter if this
desktop is currently visible or not!
As a second attempt I've called GetUserObjectIn formation for each desktop
and checked the visible flag. But the result is there is no visible
desktop
at all !?
What am I doing wrong? Or what is the right way to search for the
currently
visible desktop?
Hi,
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:04******** *************** ***********@mic rosoft.com...
Okay, let me rephrase my question more precisely:
I want the desktop currently visible at the display connected directly to
the computer. No remote or inactive desktops. And if there's more then
one,
fine, which one of them are visible?
The main thing is: I need to find the desktop which currently has full
access to the graphic adapters hardware acceleration.
hmm - can a desktop have full access to a GPU or parts of a GPU, sorry don't
know.
--
SvenC
"SvenC" wrote:
>Take a look at this blog entry, which explains why there is no "currentyl
visible desktop"
http://blogs.msdn.com/oldnewthing/ar...22/712677.aspx
--
SvenC
"Mephisto187 " <Me*********@di scussions.micro soft.comwrote in message
news:40******* *************** ************@mi crosoft.com...
How can I find the currently visible desktop? By calling
EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
I've tried to find the visible desktop by comparing the desktop handle,
returned by the OpenDesktop function, to the desktop handle received by
calling OpenInputDeskto p. The result is that the default desktop is
always
the one currently receiving user input.
But by using the default desktop my window always shows up at the
desktop
of
the first user logged on to the system after reboot. No matter if this
desktop is currently visible or not!
As a second attempt I've called GetUserObjectIn formation for each
desktop
and checked the visible flag. But the result is there is no visible
desktop
at all !?
What am I doing wrong? Or what is the right way to search for the
currently
visible desktop?
The problem is. On remote desktops there is only software rendering
available. And on invisible desktops the graphic driver is not performing any
rendering at all because there is no visible window.
So I need to get access to a visible desktop in order to get access to the
graphical hardware
"SvenC" wrote:
Hi,
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:04******** *************** ***********@mic rosoft.com...
Okay, let me rephrase my question more precisely:
I want the desktop currently visible at the display connected directly to
the computer. No remote or inactive desktops. And if there's more then
one,
fine, which one of them are visible?
The main thing is: I need to find the desktop which currently has full
access to the graphic adapters hardware acceleration.
hmm - can a desktop have full access to a GPU or parts of a GPU, sorry don't
know.
--
SvenC
"SvenC" wrote:
Take a look at this blog entry, which explains why there is no "currentyl
visible desktop"
http://blogs.msdn.com/oldnewthing/ar...22/712677.aspx
--
SvenC
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:40******** *************** ***********@mic rosoft.com...
How can I find the currently visible desktop? By calling
EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
I've tried to find the visible desktop by comparing the desktop handle,
returned by the OpenDesktop function, to the desktop handle received by
calling OpenInputDeskto p. The result is that the default desktop is
always
the one currently receiving user input.
But by using the default desktop my window always shows up at the
desktop
of
the first user logged on to the system after reboot. No matter if this
desktop is currently visible or not!
As a second attempt I've called GetUserObjectIn formation for each
desktop
and checked the visible flag. But the result is there is no visible
desktop
at all !?
What am I doing wrong? Or what is the right way to search for the
currently
visible desktop?
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:40******** *************** ***********@mic rosoft.com...
How can I find the currently visible desktop? By calling
EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
If you have an hwnd that is on the desktop you are looking for, you can do a
GetWindowThread ProcessId() to get the thread id of it, then use
GetThreadDeskto p() to get an HDESK of that thread.
-- David http://www.dcsoft.com
The problem is. On remote desktops there is only software rendering
available. And on invisible desktops the graphic driver is not performing
any
rendering at all because there is no visible window.
So I need to get access to a visible desktop in order to get access to the
graphical hardware
But that is never going to work reliably.
If the Logon desktop is visible (for example, when you log on (duh) or
change your password) you can not get access to it.
Or if the visible desktop belongs to the administrator, I think you are also
out of luck.
There is a number of cases where you are not allowed access to the visible
desktop out of concern for security.
But if your desktop is not visible, it shouldn't matter if your stuff is
drawn or not.
What is is that you are trying to do?
--
Kind regards,
Bruno van Dooren br************* *********@hotma il.com
Remove only "_nos_pam"
>How can I find the currently visible desktop? By calling
>EnumWindowStat ions
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
If you have an hwnd that is on the desktop you are looking for, you can do
a GetWindowThread ProcessId() to get the thread id of it, then use
GetThreadDeskto p() to get an HDESK of that thread.
Since he doesn't know which desktop is visible, he probably wouldn't know
which windows are visible either.
And of course, you cannot get access to the logon desktop - and possible
other desktops as well- for security reasons.
--
Kind regards,
Bruno van Dooren br************* *********@hotma il.com
Remove only "_nos_pam"
Pretty smart, unfortunately I don't have such a handle.
"David Ching" wrote:
"Mephisto18 7" <Me*********@di scussions.micro soft.comwrote in message
news:40******** *************** ***********@mic rosoft.com...
How can I find the currently visible desktop? By calling
EnumWindowStati ons
and EnumDesktops I get a list of all available desktops. But is there a
way
to figure out which one of them is currently visible?
If you have an hwnd that is on the desktop you are looking for, you can do a
GetWindowThread ProcessId() to get the thread id of it, then use
GetThreadDeskto p() to get an HDESK of that thread.
-- David
http://www.dcsoft.com
Actually, I've already managed to open a window on the administrators desktop
from within my remote desktop.
What I'm doing is the graphical component for a benchmarking tool designed
to be used in hospitals for unattended system checks.
If the window is not visible the graphic driver is so clever that he is not
performing real rendering any more. At least the framerate reaches
astronomical values.
"Bruno van Dooren [MVP VC++]" wrote:
The problem is. On remote desktops there is only software rendering
available. And on invisible desktops the graphic driver is not performing
any
rendering at all because there is no visible window.
So I need to get access to a visible desktop in order to get access to the
graphical hardware
But that is never going to work reliably.
If the Logon desktop is visible (for example, when you log on (duh) or
change your password) you can not get access to it.
Or if the visible desktop belongs to the administrator, I think you are also
out of luck.
There is a number of cases where you are not allowed access to the visible
desktop out of concern for security.
But if your desktop is not visible, it shouldn't matter if your stuff is
drawn or not.
What is is that you are trying to do?
--
Kind regards,
Bruno van Dooren
br************* *********@hotma il.com
Remove only "_nos_pam"
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