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• How to use Win32 SetCursor() with WPF resource and HwndHost

  - by Hank

  We have an HwndHost UIElement in our WPF application which is used to display Direct3d graphics, and the only way I have found to set a cursor for the HwndHost UIElment is to call the Win32 API SetCursor(). All of our cursors are resources in managed assemblies, and I would prefer to not change that, but I have not been able to find a way to load one of these cursors via any Win32 APIs like LoadImage(). Does anybody know how to get a handle(hCursor) to a cursor which is a resource in a managed assembly? Or, is there another way to set a cursor on an HwndHost displaying Direct3D graphics?

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• WPF WIN32 hwndhost WM_MOUSEMOVE WM_MOUSEHOVER

  - by Neil B

  I have a WPF app with a usercontrol that contains a HwndHost. The HwndHost is created as follows: hwndHost = CreateWindowEx(0, "static", "", WS_CHILD | WS_VISIBLE, 0, 0, hostHeight, hostWidth, hwndParent.Handle, (IntPtr)HOST_ID, IntPtr.Zero, 0); hwndControl = CreateWindowEx(0, "Static", "", WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN , 0, 0, hostHeight, hostWidth, hwndHost, (IntPtr)PICTUREBOX_ID, IntPtr.Zero, 0); I then hook into the message pump using HwndSourceHook and loads of messages come through. Except the ones I want i.e. WM_MOUSEMOVE, WM_MOUSEHOVER, WM_LBUTTONDOWN and WM_LBUTTONUP Also the OnMouseLeftButtonDown event is not fired in the WPF code on the main window or the control, I assume because windows is trapping it and throwing it away. Anybody know how I can get these to come through, either with or without using the WIN32 window messages?

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• WPF HwndHost keyboard focus

  - by Adal

  The chart area in the screenshot is a HwndHost control which hosts a native Win32 window (with it's own registered WNDCLASS) implemented in C++/CLI and drawn with Direct2D. The HwndHost is hosted in a WPF Border control. The problem I have is that I can't set the keyboard focus to the hosted Win32 window. I want the focus to move to the hosted Win32 window when the used clicks on the chart area. I tried calling SetFocus on WM_LBUTTONDOWN, but that screws app the focus in the rest of the application. Currently, even if I click on the Win32 window, the focus remains on the tree-view on the left, and if I press the up/down cursor keys, the tree-view will get them, not the chart window. How do I make the hosted Win32 window receive keyboard input from when the user clicks on the chart area, until it clicks on another control (like the tree-view, or the toolbar)?

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• Handling messages for window from other process

  - by MK

  I'm developing a C# WPF application that reparents the main window of another application using a call to Win32 SetParent(). The handle to this out-of-process child window is wrapped by a class named FormHost which is derived from HwndHost. All is working well except for one thing: messages for the reparented window are not delivered to FormHost. MSDN documentation clearly states that the HwndHost window procedure WndProc() cannot be used with out-of-process windows. The alternative, MessageHook doesn't work either. I also tried calling AttachThreadInput() to combine the input processing of the two windows. No luck. Any suggestions?

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• Am I a discoverer of a bug in the WPF engine?

  - by bitbonk

  We have a MFC 8 application compiled with /CLR that contains a larger amount of Windows Forms UserControls wich again contain WPF user controls using ElementHost. Due to the architecture of our software we can not use HwndHost directly. We observed an extremely strange behavior here that we can not make any sense of: When the CPU load is very high during startup of the application and there are a lot live of ElementHost instances, the whole property engine completely stops working. For example animations that usually just work fine now never update the values of the bound properties, they just stay at some random value after startup. When I set a property that is not bound to anything the value is correctly stored in the dependency property (calling the getter returns the new value) but the visual representation never reflects that. I set the background to red but the background color does not change. We tested this on a lot of different machines all running Windows XP SP2 and it is pretty reproducible. The funny thing here is, that there is in fact one situation where the bound properties actually pickup a new value from the animation and the visual gets updated based on the property values. It is when I resize the ElementHost or when I hide and reshow the parent native control. As soon as I do this, properties that are bound to an animation pickup a new value and the visuals rerender based on the new property values - but just once - if I want to see another update I have to resize the ElementHost. Do you have any explanation of what could be happening here or how I could approach this problem to find it out? What can I do to debug this? Is there a way I can get more information about what WPF actually does or where WPF might have crashed? To me it currently seems like a bug in WPF itself since it only happens at high CPU load at startup.

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