SetWindowLong挂(SetWindowLong Hanging)

 为什么* SetWindowLong（myForm.hWnd，GWL_HWNDPARENT，parentHwnd）*挂起？ 
 
 我可以通过这三个步骤不断重现这个问题。 
 
 
 
 创建.NET表单 
 
 
 初始化WaitWindow COM对象，在传递.NET Forms Handle时调用COM对象上的ShowWindow 
 
 
 在VB6中调用SetWindowLong方法 
 
 
 C＃Windows应用程序（挂起） 
 
private static void Main(string[] args)
{
      Form form = new Form();
      form.Show();

      Interop.WaitWindow waitWindow = new Interop.WaitWindow();
      waitWindow.ShowWindow(form.Handle.ToInt32(), Language.RISEnglish);
}
 
 C＃控制台应用程序（不挂起） 
 
private static void Main(string[] args)
{
      IntPtr handle = Process.GetCurrentProcess().MainWindowHandle;     

      Interop.WaitWindow waitWindow = new Interop.WaitWindow();
      waitWindow.ShowWindow(handle.ToInt32(), Language.RISEnglish);
}
 
 VB6代码片段 
 
Public Sub ShowWindow(ByVal parentHwnd As Long, ByVal language As Language)

    SetWindowLong(myForm.hWnd, GWL_HWNDPARENT, parentHwnd)  'Hangs Here
    CenterWindow (parentHwnd)

    myForm.ShowRetrieving (language)
    myForm.Show (vbModal)
End Sub
 
 非常感谢你的帮助:) 
 
 编辑 
 
 我知道不应该调用SetWIndowLong来更改父级，但我试图理解为什么它只在使用.NET表单句柄时挂起。 
 
 EDIT2 
 
 我现在相信这个问题与SetWindowLong无关，而是实际的句柄本身。 我还在调查，但似乎当我从.NET调用VB6代码时，它会创建一个RPC线程。 我还不确定，但我觉得它与跨线程问题有关。 

Why does SetWindowLong(myForm.hWnd, GWL_HWNDPARENT, parentHwnd) hang?
 
I can recreate this problem consistently doing these three steps.
 
 
 
Create the .NET Form
 
 
Initalize the WaitWindow COM object, call ShowWindow on the COM object while passing the .NET Forms Handle
 
 
In VB6 invoke the SetWindowLong method
 
 
C# Windows Application (Hangs)
 
private static void Main(string[] args)
{
      Form form = new Form();
      form.Show();

      Interop.WaitWindow waitWindow = new Interop.WaitWindow();
      waitWindow.ShowWindow(form.Handle.ToInt32(), Language.RISEnglish);
}
 
C# Console Application (Doesn't Hang)
 
private static void Main(string[] args)
{
      IntPtr handle = Process.GetCurrentProcess().MainWindowHandle;     

      Interop.WaitWindow waitWindow = new Interop.WaitWindow();
      waitWindow.ShowWindow(handle.ToInt32(), Language.RISEnglish);
}
 
VB6 Code Snippet
 
Public Sub ShowWindow(ByVal parentHwnd As Long, ByVal language As Language)

    SetWindowLong(myForm.hWnd, GWL_HWNDPARENT, parentHwnd)  'Hangs Here
    CenterWindow (parentHwnd)

    myForm.ShowRetrieving (language)
    myForm.Show (vbModal)
End Sub
 
Really would appreciate your help :)
 
EDIT
 
I do understand that SetWIndowLong shouldn't be called to change the parent but I'm trying to understand why it hangs only when a .NET form handle is used.
 
EDIT2
 
I now believe the issue is not related to SetWindowLong but the actual handle itself. I'm still investigating but it appears that when I call the VB6 code from .NET it creates an RPC thread. I'm not sure yet but I have a feeling it has something to do with a cross-threading issue.

原文：https://stackoverflow.com/questions/10216414