使用WIn32 SetParent()在非WPF应用程序内托管WPF应用程序

Question

我有一个WPF应用程序,我想看起来它托管在另一个 - 非WPF - 应用程序.在现实生活中,这个非WPF应用程序是Internet Explorer中的ActiveX,但为了说明问题,我使用了一个简单的Windows窗体应用程序.

我使用Windows API函数SetParent,已经有几十个线程.但是,我找不到任何关于我的确切问题的内容:WPF应用程序右侧和底部的小区域未在非WPF应用程序窗口内绘制.

WPF窗口自行运行:

使用WinForm应用程序窗口作为父级的WPF窗口:

如果将WPF应用程序与WinForms应用程序或普通Win32应用程序(如记事本)交换,我不会遇到此问题.

WinForm代码如下所示:

private void Form1_Load(object sender, EventArgs e)
    {
        // Start process
        var psi = new ProcessStartInfo("c:\\wpfapp\\wpfapp\\bin\\Debug\\wpfapp.exe");
        psi.WindowStyle = ProcessWindowStyle.Normal;
        _process = Process.Start(psi);

        // Sleep until new process is ready
        Thread.Sleep(1000);

        // Set new process's parent to this window
        SetParent(_process.MainWindowHandle, this.Handle);

        // Remove WS_POPUP and add WS_CHILD window style to child window
        const int GWL_STYLE = -16;
        const long WS_POPUP = 0x80000000;
        const long WS_CHILD = 0x40000000;
        long style = GetWindowLong(_process.MainWindowHandle, GWL_STYLE);
        style = (style & ~(WS_POPUP)) | WS_CHILD;
        SetWindowLong(_process.MainWindowHandle, GWL_STYLE, style);

        // Move and resize child window to fit into parent's
        MoveWindow(_process.MainWindowHandle, 0, 0, this.Width, this.Height, true);
    }

注意:我知道这个使用SetParent不一定是推荐的做法,但我想并且需要找到如何这样做,所以请让我:)

Answer 1

我找到了一个运行良好的解决方法:在SetParent之前调用MoveWindow:

private void Form1_Load(object sender, EventArgs e)
{
     // Start process            
     var psi = new ProcessStartInfo("C:\\WpfApp\\WpfApp.exe");
     psi.WindowStyle = ProcessWindowStyle.Normal;
     _process = Process.Start(psi);

     // Sleep until new process is ready
     Thread.Sleep(3000);

     // Move and resize child window to fit into parent's
     Rectangle rect;
     GetClientRect(this.Handle, out rect);
     MoveWindow(_process.MainWindowHandle, 0, 0, rect.Right - rect.Left, rect.Bottom - rect.Top, true);

     // Set new process's parent to this window
     SetParent(_process.MainWindowHandle, this.Handle);

     // Remove WS_POPUP and add WS_CHILD window style to child window
     long style = GetWindowLong(_process.MainWindowHandle, GWL_STYLE);
     style = (style & ~(WS_POPUP) & ~(WS_CAPTION)) & ~(WS_THICKFRAME) | WS_CHILD;
     SetWindowLong(_process.MainWindowHandle, GWL_STYLE, style);
}           

在SizeChanged事件处理程序中,我将子项从父项中取出,调用MoveWindow并将其移回父项.为了减少闪烁,我在执行这些操作时隐藏了窗口:

private void Form1_SizeChanged(object sender, EventArgs e)
{
     ShowWindow(_process.MainWindowHandle, SW_HIDE);

     var ptr = new IntPtr();
     SetParent(_process.MainWindowHandle, ptr);

     Rectangle rect;
     GetClientRect(this.Handle, out rect);

     MoveWindow(_process.MainWindowHandle, 0, 0, rect.Right - rect.Left, rect.Bottom - rect.Top, true);            
     SetParent(_process.MainWindowHandle, this.Handle);
     ShowWindow(_process.MainWindowHandle, SW_SHOW);
}

它没有解释为什么MoveWindow在SetParent之后不起作用,但它解决了我的问题,所以我将此标记为答案,除非出现更好的东西.