c# - 使用 SendMessage 击败 'A program is trying to access email'

Question

我正在用 C# 编写一个应用程序，该应用程序使用 Office Outlook Interop(2010；版本 14)通过 MAPI 访问电子邮件数据。

到目前为止，我必须在 Outlook 的“程序正在尝试访问存储在 Outlook 中的电子邮件地址信息”安全弹出窗口中手动重复单击“允许”(屏幕截图位于 http://i.stack.imgur.com/gj8to.png)。

我尝试编写一个方法来自动进行点击，但没有成功。单击发生，但 Outlook Interop 在下一次读取操作期间引发以下异常:

Exception from HRESULT: 0x80004004 (E_ABORT)

下面是一段使用 SendMessage 来点击允许按钮的代码:

private const Int32 BM_CLICK = 0x00F5;
private const Int32 GWL_STYLE = -16;
private const Int32 CB_SETCURSEL = 0x14E;
private const Int32 WM_LBUTTONDOWN = 0x201;
private const Int32 WM_LBUTTONUP = 0x202;

private const string dialogClass = "#32770";
private const string dialogTitle = "Microsoft Outlook";
const string tickBoxTitle = @"&Allow access for";
const string tickBoxClass = @"Button";

private const int ThreadSleepTime = 1000;
private const int ThreadUiSleepTime = 20;

IntPtr popupHandle;
IntPtr tickHandle = IntPtr.Zero;
IntPtr comboHandle = IntPtr.Zero;
IntPtr allowHandle = IntPtr.Zero;
while ((popupHandle = FindWindow(dialogClass, dialogTitle)) != IntPtr.Zero)
{
    // Get object handles
    tickHandle = FindWindowEx(popupHandle, tickHandle, tickBoxClass, tickBoxTitle);
    comboHandle = FindWindowEx(popupHandle, tickHandle, null, null);
    allowHandle = FindWindowEx(popupHandle, comboHandle, null, null);

    // Click on tickbox until the combobox is enabled
    while ((GetWindowLong(comboHandle, GWL_STYLE) & 0x8000000) != 0)
    {
        SendMessage(tickHandle, BM_CLICK, new IntPtr(1), IntPtr.Zero);
        System.Threading.Thread.Sleep(ThreadUiSleepTime);
    }

    // Set dropdown box selection index to 3rd row
    SendMessage(comboHandle, CB_SETCURSEL, 3, 0);
    System.Threading.Thread.Sleep(ThreadUiSleepTime);

    // Click Allow button
    //SendMessage(allowHandle, BM_CLICK, new IntPtr(1), IntPtr.Zero);

    SendMessage(allowHandle, WM_LBUTTONDOWN, IntPtr.Zero, new IntPtr(MakeLParam(5, 5)));
    System.Threading.Thread.Sleep(ThreadUiSleepTime); 
    SendMessage(allowHandle, WM_LBUTTONUP, IntPtr.Zero, new IntPtr(MakeLParam(5, 5)));
}

为什么 SendMessage 不起作用，我该如何让它起作用？

Answer 1

您应该使用 EMAPI，它不会显示这些警告。
Redemption library提供了一个方便的包装器。