PLEASE HELP! Switch from extended to non-extended desktop programatically?

[gangelo]

Hi,

I have a dual monitor pc that I need to programatically switch from extended to non-extended desktop. Can someone direct me where to start?

Thank you

[Tischnoetentoet]

well, isn't that just the position of the screen that's going to the other desktop??

So just add the width of the screen to the left of the dialog.

When you want to switch back, you can delete the width of the screen again!

I thought desktop doesn't use "2 different monitors"...

try this, but I can be wrong ;)

[gangelo]

well, isn't that just the position of the screen that's going to the other desktop??

So just add the width of the screen to the left of the dialog.

When you want to switch back, you can delete the width of the screen again!

I thought desktop doesn't use "2 different monitors"...

try this, but I can be wrong ;)

I was talking about EXTENDING the desktop, not making an app window span across a dual monitor system.

[gangelo]

:confused: Hi,

I have a dual monitor pc that I need to programatically switch from extended to non-extended desktop. Can someone direct me where to start? I am using XP Home.

Thank you

[Mick]

You should poke around with ChangeDisplaySettingsEx(...). I am not sure whether the .cpl for desk adds the extend my monitor, or if it is a .cpl extension coming from the particular video/driver vendor (don't have a dual in front of me right now). But the driver should be getting a ChangeDisplaySettings(Ex) call when you modify the property page settings. You might want to confirm that by breakpointing on those API calls while running the .cpl under a debugger, and see what values it is passing...isn't much documentation on that setting in the property pages.

Here is some documentation with a slight hint about it:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/monitor_4zak.asp

[Mick]

[merged threads]

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