[Interest] The calling thread must be STA, because many UI components require this.

[prasad v n]

hi,
I wanted to host a WPF user control in my QT application.
So I created a CLI dll that returns the HWND of the user control. It
creates an HwndSource for the WPF control and returns the handle of that
HWND source.

I added reference to this CLI dll from my QT application and tried to get
the HWND.

But I am getting an error as given below.


Unhandled Exception: System.InvalidOperationException: The calling thread
must be STA, because many UI components require this.

at System.Windows.Input.InputManager..ctor()

at System.Windows.Input.InputManager.GetCurrentInputManagerImpl()

at System.Windows.Interop.HwndMouseInputProvider..ctor(HwndSource source)

at System.Windows.Interop.HwndSource.Initialize(HwndSourceParameters
parameters)

at System.Windows.Interop.HwndSource..ctor(Int32 classStyle, Int32 style,
Int32 exStyle, Int32 x, Int32 y, Int32 width, Int32 height, String name,
IntPtr parent)

at GetWPFHwnd(HWND__* parent, Int32 x, Int32 y, Int32 width, Int32 height)
in
c:\users\ing08746\desktop\qt\staticclilib\staticclilib\staticclilib.cpp:line
42

at WinMainCRTStartup()


I think we need to set the ApartmentState of QT application as STA.

How can  set the apartment state to STA for QT application?


with regards,

prasad
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20150401/08d11a27/attachment.html>