在 WPF 中托管外部 exe

Question

您好，我正在尝试在 WPF 应用程序中托管一个 exe（记事本）。 请在此处找到代码：

public partial class MainWindow : Window
{
    private Process _process;
    private System.Windows.Forms.Panel _panel;

    [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();
        _process = Process.Start("notepad.exe");

        _panel = new System.Windows.Forms.Panel();
        wfHost.Child = _panel;
        var patranPanelHandle = _panel.Handle;
        SetParent(_process.MainWindowHandle, patranPanelHandle);

        // 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)_panel.Width, (int)_panel.Height, SWP_NOZORDER | SWP_NOACTIVATE);
    }

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

相同的代码在 Winforms 上运行得非常好，所以我使用了 WinformsHost，然后添加了一个 winforms 面板，如上所述。但结果并不如预期。记事本出现在 WPF 应用程序之外，父子程序无法正常工作

this 也没有答案

Answer 1

我认为，您调用SetParent 太快了。一旦父窗口和子窗口都准备好，您需要执行SetParent。所以，你可以做的是等到父窗口是Loaded，然后启动子进程。但是，在调用 SetParent 之前，请在子进程上调用 WaitForInputIdle。

下面是我尝试过的示例代码，它可以工作：

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("notepad.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;
    }

有关 WaitForInputIdle 的更多信息，请参阅此MSDN 页面。

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