Is it possible to host a QT application into a WPF application?

Question

I'm trying to create WPF GUI application to host an already exist QT GUI application as part of the main UI.

The QT application don't need to deal with mouse/keyboard input.

I've tried approach mentioned in this SO Post. Seems all those approach does not work for a QT application.

Answer 1

I don't know if it's a right thing to do, but that's what I used some times to embedd other apps (found on the internet):

public partial class MainWindow : Window
{
private Process _process;

[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

[DllImport("user32.dll", SetLastError = true)]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

[DllImport("user32")]
private static extern IntPtr SetParent(IntPtr hWnd, IntPtr hWndParent);

[DllImport("user32")]
private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags);

private const int SWP_NOZORDER = 0x0004;
private const int SWP_NOACTIVATE = 0x0010;
private const int GWL_STYLE = -16;
private const int WS_CAPTION = 0x00C00000;
private const int WS_THICKFRAME = 0x00040000;
const string patran = "patran";
public MainWindow()
{
    InitializeComponent();

    Loaded += (s, e) => LaunchChildProcess();
}

private void LaunchChildProcess()
{
    _process = Process.Start("/path/to/QtExecutable.exe");
    _process.WaitForInputIdle();

    var helper = new WindowInteropHelper(this);

    SetParent(_process.MainWindowHandle, helper.Handle);

    // remove control box
    int style = GetWindowLong(_process.MainWindowHandle, GWL_STYLE);
    style = style & ~WS_CAPTION & ~WS_THICKFRAME;
    SetWindowLong(_process.MainWindowHandle, GWL_STYLE, style);
    // resize embedded application & refresh
    ResizeEmbeddedApp();
}

private void ResizeEmbeddedApp()
{
    if (_process == null)
        return;
    SetWindowPos(_process.MainWindowHandle, IntPtr.Zero, 0, 0, (int)ActualWidth, (int)ActualHeight, SWP_NOZORDER | SWP_NOACTIVATE);
}

protected override Size MeasureOverride(Size availableSize)
{
    Size size = base.MeasureOverride(availableSize);
    ResizeEmbeddedApp();
    return size;
}

Just modify this skeleton to your necessities. Let me know if it works.

Answer 2

Yes. It is possible. A very simple way for your quick start without the effort of coding.

Check this link: Hosting EXE Applications in a WPF Window Application (http://www.codeproject.com/Tips/673701/Hosting-EXE-Applications-in-a-WPF-Window-Applicati). Download the project. Find "notepad.exe" in the project and replace it with the file name of your QT application. Just a remind: for the WPF exe to launch the QT application, you may need to take care of the environment variables required by QT.

What it looks like: