outlook C#加载项中的发送邮件不起作用

Question

我正在尝试获取Outlook C#外接程序，以便使用SendMessage滚动左侧导航窗格。这似乎没有效果。外接程序是否在比Outlook更低的权限级别下运行，因此由于UIPI而阻止SendMessage工作？

我使用EnumChildWindows (它是递归的)迭代来查找左侧导航窗格的子窗口的句柄，就像使用Spy++标识的那样，使用GetWindowText通过类名查找它。"workerBeeFunc“是由EnumChildWindows调用的委托。Spy++告诉我导航窗格窗口是第二个窗口的子窗口，第二个窗口的类名是"NUIDocumentWindow“(我把所有的WinAPI DLLImport语句都留在这里了)：

private const int WM_VSCROLL = 277; // Vertical scroll
private const int SB_PAGEDOWN = 3; // Scrolls one page down
static StringBuilder childWindowNames = new StringBuilder();
private int NUIWindowCounter = 0;
private stopIterating as bool = false;

public delegate int EnumChildProc(IntPtr hWnd, IntPtr lParam);  //Declare the delegate

public int workerBeeFunc(IntPtr hwndChild, IntPtr Param) //The function the delegate of EnumChildWindows goes to to get the work done.
{
   int a;
   a = WinAPIs.GetWindowText(hwndChild, childWindowNames, 100); //childWindowNames gets cleared on each iteration of this function

   if (childWindowNames.ToString() == "NUIDocumentWindow")
   { 
      NUIWindowCounter++;


      if (NUIWindowCounter == 2)  //The NEXT window is the Navigation Pane
      {
         stopIterating = true;
      }
   return 1;  //Keep iterating
   }

   if (stopIterating == true)
   {
      SendMessage(hwndChild, WM_VSCROLL, (IntPtr)SB_PAGEDOWN, IntPtr.Zero);
      return 0;   //Stop iterating
   }
}

SendMessage会因为UIPI而静默失败吗？

谢谢。

Answer 1

外接程序在与Outlook本身相同的安全上下文中运行。

任何控件都不需要使用WM_VSCROLL消息。你真的在Spy++中看到它了吗？