使用SetParent冻结父窗口 [英] Using SetParent freeze the parent window

问题描述

我有一个使用C#编写的应用程序，该应用程序创建一个表单并将其堆叠在另一个应用程序窗口的前面.我通过使用 SetParent 来做到这一点.但是，(新)父窗口冻结.

I have an application in C# which creates a form and stack it in front of another app's window. I do this by using SetParent. However, the (new) parent window freezes.

我该如何解决?这是线程问题吗?

How can I solve that? Is this a matter of threading?

这有效:

private void Test(object sender, EventArgs e)
        {
            FormCover cov = new FormCover();
            IntPtr hwnd = Win32Utils.FindWindowByCaptionStart(IntPtr.Zero, TrackerName, null);

            Win32Utils.SetParent(cov.Handle, hwnd);
            cov.SetDesktopLocation(0, 0);

            cov.Show();
        }

但这(带有经过计时器的事件)不是:

But this (with a timer elapsed event) is not:

public partial class Form1 : Form
    {

FormCover cover;

void tmrCheck_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            ShowCover();
        }

private void ShowCover()
        {
            cover = new FormCover();
            IntPtr hwnd = Win32Utils.FindWindowByCaptionStart(IntPtr.Zero, TrackerName, null);

            cover.CoverInitialize(hwnd);
            cover.Activate();
        }
}
//------

public partial class FormCover : Form
    {
        public delegate void IntPtrDlg(IntPtr param);

        public FormCover()
        {
            InitializeComponent();
        }

        internal void CoverInitialize(IntPtr hwdnParent)
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new IntPtrDlg(CoverInitialize), new object[] { hwdnParent });
            }
            else
            {
                Win32Utils.SetParent(this.Handle, hwdnParent);
                this.SetDesktopLocation(0, 0);
            }
        }

        internal void CoverActivate(IntPtr handleFormulario)
        {
            if (!Visible)
                this.Show();
        }

        internal void CoverFinalize()
        {
            Hide();
            Win32ParentUtils.SetParent(Handle, new IntPtr());
        }
    }

这两个样本之间有什么区别?第一个工作正常，第二个冻结当前的窗口.

What is the difference between these two samples? The first one is working fine, the second one is freezing the aprent window.

推荐答案

正如我刚才所说，您将需要为表单创建一个消息泵.试试

As I just stated, you'll need to create a message pump for your form. Try

Thread thread = new Thread( () =>
{
     var formCover = new FormCover();
     Application.Run(formCover);
});
thread.ApartmentState = ApartmentState.STA;
thread.Start();

然后，您应该可以设置表单的父级.

Then you should be able to set the parent of your form.

请参见此处以供进一步参考.

See here for further reference.

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