delphi - 将窗口嵌入到另一个进程中

Question

我在 StackOverflow 上读过一些帖子，但没有一个对我有用。这是我用来在表单上显示标准计算器窗口的代码:

procedure TForm1.Button1Click(Sender: TObject);
var
  Tmp: Cardinal;
  R: TRect;
begin
  CalcWindow := FindWindow(nil, 'Calculator');
  if (CalcWindow <> 0) then
  begin
    GetWindowThreadProcessID(CalcWindow, CalcProcessID);

    Tmp := GetWindowLong(CalcWindow, GWL_STYLE);
    Tmp := (Tmp and not WS_POPUP) or WS_CHILD;
    SetWindowLong(CalcWindow, GWL_STYLE, Tmp);
    GetWindowRect(CalcWindow, R);

    SetForegroundWindow(CalcWindow);
    Windows.SetParent(CalcWindow, Panel1.Handle);
    SetWindowPos(CalcWindow, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE or SWP_FRAMECHANGED);

    AttachThreadInput(GetCurrentThreadID(), CalcWindow, True);
  end;
end;

它确实在我的表单上显示了窗口，但玻璃边框丢失了，有时(特别是当我移动表单时)，很难将焦点恢复到嵌入的窗口(我需要单击几次)。

这可能是什么原因造成的？另外，您是否发现使用此方法可能会遇到任何潜在问题？

感谢您的宝贵时间。

Answer 1

试试这个代码。我从我的一份旧源代码中获取了它。您将失去玻璃框架，但主菜单是可见的，并且我没有注意到将焦点设置回嵌入式应用程序有任何问题。您应该能够使用 SetForegroundWindow() API 函数来执行此操作。每当您移动容器表单时，您的嵌入式应用程序就会失去焦点，因此您需要再次调用 SetForegroundWindow 来恢复焦点:

procedure ShowAppEmbedded(WindowHandle: THandle; Container: TWinControl);
var
  WindowStyle : Integer;
  FAppThreadID: Cardinal;
begin
  /// Set running app window styles.
  WindowStyle := GetWindowLong(WindowHandle, GWL_STYLE);
  WindowStyle := WindowStyle
                 - WS_CAPTION
                 - WS_BORDER
                 - WS_OVERLAPPED
                 - WS_THICKFRAME;
  SetWindowLong(WindowHandle,GWL_STYLE,WindowStyle);

  /// Attach container app input thread to the running app input thread, so that
  ///  the running app receives user input.
  FAppThreadID := GetWindowThreadProcessId(WindowHandle, nil);
  AttachThreadInput(GetCurrentThreadId, FAppThreadID, True);

  /// Changing parent of the running app to our provided container control
  Windows.SetParent(WindowHandle,Container.Handle);
  SendMessage(Container.Handle, WM_UPDATEUISTATE, UIS_INITIALIZE, 0);
  UpdateWindow(WindowHandle);

  /// This prevents the parent control to redraw on the area of its child windows (the running app)
  SetWindowLong(Container.Handle, GWL_STYLE, GetWindowLong(Container.Handle,GWL_STYLE) or WS_CLIPCHILDREN);
  /// Make the running app to fill all the client area of the container
  SetWindowPos(WindowHandle,0,0,0,Container.ClientWidth,Container.ClientHeight,SWP_NOZORDER);

  SetForegroundWindow(WindowHandle);
end;

你可以这样调用它:

  ShowAppEmbedded(FindWindow(nil, 'Calculator'), Panel1);