QT写的exe嵌入到wpf中

1.cs代码

public partial class MainWindow : Window
    {
        //声明调用user32.dll中的函数
        [DllImport("user32.dll")]
        static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
        [DllImport("user32.dll")]
        static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
        //定义变量
        private IntPtr prsmwh;//外部EXE文件运行句柄
        private Process app;//外部exe文件对象
        public MainWindow()
        {
            this.InitializeComponent();            
        }

        private void flash_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            //获取当前窗口句柄
            IntPtr handle = new WindowInteropHelper(this).Handle;
            string path=System.Environment.CurrentDirectory + @"\positioning\CTHME.exe";
            app = Process.Start(path);
            prsmwh = app.MainWindowHandle;
            while ( prsmwh ==IntPtr.Zero)
            {
                 prsmwh = app.MainWindowHandle;
            }
            //设置父窗口
            SetParent(prsmwh,handle);
            ShowWindowAsync(prsmwh,3);//子窗口最大化
        }

        private void Window_Closed(object sender, System.EventArgs e)
        {
            if (app.CloseMainWindow()){
                app.Kill();
                app.Close();                
            }
        }        
    }
}

2.xaml代码

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="WpfEXE.MainWindow"
    x:Name="Window"
    Title="test"
    Width="640" Height="480" WindowStartupLocation="CenterScreen" Closed="Window_Closed" WindowState="Maximized">

    <Grid x:Name="LayoutRoot">
        <Grid.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="Blue" Offset="0.313"/>
                <GradientStop Color="White" Offset="1"/>
            </LinearGradientBrush>
        </Grid.Background>

        <Button x:Name="flash" Content="测试" Height="25" VerticalAlignment="Top" Cursor="Hand" FontSize="14.667" Margin="0,78,0,0" Click="flash_Click" HorizontalAlignment="Left" Width="104"/>

    </Grid>
</Window>