Hello,
I'm pretty confused ...
I created a file that SC works fine if the viewer is on windows 7.
The the viewer version that I was using was 1.1.9.3.
I installed the same version on windows 8.1 but the screen refresh was very slow (but magically everything worked fine if at the same time I opened a RDP session to the computer excecuting the SC file .
I then downloaded and installed version 1.1.9.6 (for windows 8_ ) .. and I run the viewer on .\installer64 ... but nothing has changed.
I read something in the forum on "install w8hook64.dll" (my PC is 64-bit), and that this could be the solution to my problem.
But how do It ?
I moved the files in the folder installer64 mo did not change anything.
Can you help?
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Feedback is always welcome
2025-12-05: Celebrating the 23th anniversary of the UltraVNC (26th anniversary since the laying of the foundation stone): https://forum.uvnc.com/viewtopic.php?t=38130
2025-12-03: Could you please complete our poll/survey? Renaming UltraVNC files and service to be more clear: https://forum.uvnc.com/viewtopic.php?t=38128
There was a problem to vote, it is solved now! Thanks in advance!
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Refresh on Windows 8
- Rudi De Vos
- Admin & Developer

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Re: Refresh on Windows 8
Viewer is independed of OS version.
Running a viewer on XP or win8 should not make any difference, a viewer is like a avi player.
SC ?
SC is a seperated version, you build online.
For SC you best use the viewer what can be donwloaded on the SC page.
I'm confused about what you are trying.
viewer:
This is a single exe, vncviewer.exe it doesn't use any hook or drivers.
Server:
The server winvnc.exe that capture the image use w8hook vnchook in combination with screen polling.
works fine ? or not fine ?
I'm sorry, but i have no clue what's working or not.
Running a viewer on XP or win8 should not make any difference, a viewer is like a avi player.
SC ?
SC is a seperated version, you build online.
For SC you best use the viewer what can be donwloaded on the SC page.
I'm confused about what you are trying.
viewer:
This is a single exe, vncviewer.exe it doesn't use any hook or drivers.
Server:
The server winvnc.exe that capture the image use w8hook vnchook in combination with screen polling.
works fine ? or not fine ?
I'm sorry, but i have no clue what's working or not.
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Re: Refresh on Windows 8
Thanks for the replies,
now I understand what driver w8hook is ...
However , I have this situation:
a server (SC)
a Distributer
and a client (viewer)
When the viewer run on windows 8, the refresh is very slow (20/30 sec) but on windows 7 works well.
I hope now that I have explained it well.
Thanks
now I understand what driver w8hook is ...
However , I have this situation:
a server (SC)
a Distributer
and a client (viewer)
When the viewer run on windows 8, the refresh is very slow (20/30 sec) but on windows 7 works well.
I hope now that I have explained it well.
Thanks
- Rudi De Vos
- Admin & Developer

- Posts: 6978
- Joined: 2004-04-23 10:21
- Contact:
Re: Refresh on Windows 8
I don't see any speed difference between a xp -vista-win7 win8 OS that is running a viewer.
The viewer speed just doesn't depend on the OS you run it on. It depend on the network and cpu.
Can anybody else confirm a win7-win8 speed difference for the viewer ?
Could it that a win8 is on wifi ?
What's the encoder use by both viewers?
Press (!) button to see the encoder that's used.
The viewer speed just doesn't depend on the OS you run it on. It depend on the network and cpu.
Can anybody else confirm a win7-win8 speed difference for the viewer ?
Could it that a win8 is on wifi ?
What's the encoder use by both viewers?
Press (!) button to see the encoder that's used.
UltraVNC links (join us on social networks):
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- Website: https://uvnc.com/
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Re: Refresh on Windows 8
Thanks for the reply,Rudi De Vos wrote:I don't see any speed difference between a xp -vista-win7 win8 OS that is running a viewer.
The viewer speed just doesn't depend on the OS you run it on. It depend on the network and cpu.
Can anybody else confirm a win7-win8 speed difference for the viewer ?
Could it that a win8 is on wifi ?
What's the encoder use by both viewers?
Press (!) button to see the encoder that's used.
of course I did the test in the same conditions: the same hardware (only 1 pc is used) run on WIndows 8.1 and Windows 7 as client UltraVncViewer.
The two tests are made on the local network and then in a few minutes under the same conditions.
For the client seems that the " ViewOnly mode" is actived but the server's user see move the mouse pointer and click / double-click.
Only after 20/30 seconds, the client screen is refreshced..
Re: Refresh on Windows 8
No Answer: I have to give up hope?