In our C# WPF we use a 3rd party (unmanaged) library that display a map.
We use the System.Windows.Interop.D3DImage class.
The 3rd party library uses Direct3D for the the IntPtr32 surface location property.
When i open a remote desktop from another computer and trying to view the WPF Client, we see the map.
Once the WPF UI Client is up, and I minimize the RDP session or close the RDP i will get exception:
Direct3D device is lost
From my experience with video streaming applications, When a window is minimized, it is stop rendering the image in order to save bandwitdh.
I guess rdp is acting the same ? Is it configureable ? I wish to continue streaming even if window is minimized.
I know that there are additional settings in the .RDP file as mentioned here.
The directx is set to: redirectdirectx:i:1
Partial answer so far:
When RDP client application is connecting to RDP Service, when the window is shown, it is GUI mode, when it is minimized, it is GUI-LESS mode, and the Direct 3D Components are really lost. in order to keep them alive during minimize, a registry key must be turned on (RemoteDesktop_SuppressWhenMinimized)
From this page: http://www.networkautomation.com/urc/knowledgebase/running-interactive-tasks-in-minimized-remote-desktop-windows/4ecdf43e03470/
Use this key for 1 particular user (use HKLM for all users):
HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\RemoteDesktop_SuppressWhenMinimized
type = DWORD
Values:
0 = SUPPRESS_WHEN_MINIMIZED_AUTO
1 = SUPPRESS_WHEN_MINIMIZED_ENABLE
2 = SUPPRESS_WHEN_MINIMIZED_DISABLED