ActiveX 控件在一个主机容器中变为空白，但在其他容器中则不然

发布于 2024-09-12 15:24:33 字数 298 浏览 3 评论 0原文

我需要使用 activeX 为遗留应用程序创建插件。我使用 C#，以便可以共享几个相关独立产品的代码库。

当我将控件托管在 SDK 的测试容器 (TstCon32.exe) 中时，一切正常。问题是，当我第一次尝试将其加载到目标应用程序中时，如果我更改了控件的背景颜色，那么除了我单击的项目（文本框或数据网格单元格）之外的所有内容都被涂上了控件灰色控制到其他东西，背景保持与我指定的颜色相同，但所有控件仍然被控制灰色覆盖（来自容器应用程序？）。单击其他控件将导致它们进行绘制，调整控件的大小将导致所有内容重新绘制。初始消隐后，控制功能正常运行，直到下一次创建副本为止。

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银河中√捞星星 2024-09-19 15:24:33

我终于找到了解决办法。第一部分是将我的目标框架从 4.0 更改为之前的版本。这揭示了当控件被清空时发生的异常，该控件之前被消耗并对我隐藏：

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at System.Windows.Forms.UnsafeNativeMethods.IOleInPlaceSite.OnUIActivate()
   at System.Windows.Forms.Control.ActiveXImpl.InPlaceActivate(Int32 verb)
   at System.Windows.Forms.Control.ActiveXImpl.OnFocus(Boolean focus)
   at System.Windows.Forms.Control.ChildGotFocus(Control child)
   at System.Windows.Forms.Control.OnGotFocus(EventArgs e)
   at System.Windows.Forms.Control.WmSetFocus(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

从那里我能够找到帖子，作者：tomasvdb，他遇到了与我使用 Google 边栏相同的问题。

对该帖子的回复之一链接到此 message 为侧边栏应用程序向 .net 控件发送无效数据的错误提供了解决方法。

在控件的 VisibleChanged 事件处理程序中调用该解决方法也解决了我的问题。

I finally found a solution. The first part was to change my targeted framework from 4.0 to a prior version. This revealed an exception thta was occuring when the control was blanked that was previously being consumed and hidden from me:

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at System.Windows.Forms.UnsafeNativeMethods.IOleInPlaceSite.OnUIActivate()
   at System.Windows.Forms.Control.ActiveXImpl.InPlaceActivate(Int32 verb)
   at System.Windows.Forms.Control.ActiveXImpl.OnFocus(Boolean focus)
   at System.Windows.Forms.Control.ChildGotFocus(Control child)
   at System.Windows.Forms.Control.OnGotFocus(EventArgs e)
   at System.Windows.Forms.Control.WmSetFocus(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

From there I was able to find a post by tomasvdb who encountered the same problem I had with the Google Sidebar.

One of the replies to that post linked to this message which provided a workaround for a bug where the sidebar application was sending invalid data to the .net control.

Calling that workaround method in the Control's VisibleChanged event handler solved my problem as well.

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