我想编写一个应用程序来监视 IE / FireFox 中所有打开的选项卡的内容，并在选项卡中显示特定数据后触发事件。
我想知道是否有用于 IE/FF 的 API 将焦点设置在特定选项卡上，以便一旦触发事件，我将焦点设置在相关选项卡上。
提前致谢
问问题
4147 次
2 回答
2
不幸的是，没有特定的 API 可以激活选项卡或为其设置焦点。
Bellow 是如何激活选项卡的代码，但它仅适用于 IE！
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using Accessibility;
namespace IETabsInteraction
{
internal class TabActivator
{
#region Nested type: OBJID
private enum OBJID : uint
{
OBJID_WINDOW = 0x00000000,
}
#endregion
#region Declarations
private const int CHILDID_SELF = 0;
private readonly IntPtr _hWnd;
private IAccessible _accessible;
[DllImport("oleacc.dll")]
private static extern int AccessibleObjectFromWindow(IntPtr hwnd, uint id, ref Guid iid,
[In, Out, MarshalAs(UnmanagedType.IUnknown)] ref object
ppvObject);
[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass,
string lpszWindow);
[DllImport("oleacc.dll")]
private static extern int AccessibleChildren(IAccessible paccContainer, int iChildStart, int cChildren,
[In, Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] object[] rgvarChildren, out int pcObtained);
#endregion
#region Constructors
internal TabActivator(IntPtr ieHandle)
{
_hWnd = ieHandle;
AccessibleObjectFromWindow(GetDirectUIHWND(ieHandle), OBJID.OBJID_WINDOW, ref _accessible);
CheckForAccessible();
}
private TabActivator(IAccessible acc)
{
if (acc == null)
throw new Exception("Could not get accessible");
_accessible = acc;
}
#endregion
private TabActivator[] Children
{
get
{
var num = 0;
var res = GetAccessibleChildren(_accessible, out num);
if (res == null)
return new TabActivator[0];
var list = new List<TabActivator>(res.Length);
foreach (object obj in res)
{
var acc = obj as IAccessible;
if (acc != null)
list.Add(new TabActivator(acc));
}
return list.ToArray();
}
}
private int ChildCount
{
get { return _accessible.accChildCount; }
}
/// <summary>
/// Gets LocationUrl of the tab
/// </summary>
private string LocationUrl
{
get
{
var url = _accessible.accDescription[CHILDID_SELF];
if (url.Contains(Environment.NewLine))
url = url.Split('\n')[1];
return url;
}
}
private void CheckForAccessible()
{
if (_accessible == null)
throw new Exception("Could not get accessible. Accessible can't be null");
}
internal void ActivateByTabsUrl(string tabsUrl)
{
var tabIndexToActivate = GetTabIndexToActivate(tabsUrl);
AccessibleObjectFromWindow(GetDirectUIHWND(_hWnd), OBJID.OBJID_WINDOW, ref _accessible);
CheckForAccessible();
var index = 0;
var ieDirectUIHWND = new TabActivator(_hWnd);
foreach (var accessor in ieDirectUIHWND.Children)
{
foreach (var child in accessor.Children)
{
foreach (var tab in child.Children)
{
if (tabIndexToActivate >= child.ChildCount - 1)
return;
if (index == tabIndexToActivate)
{
tab.ActivateTab();
return;
}
index++;
}
}
}
}
private void ActivateTab()
{
_accessible.accDoDefaultAction(CHILDID_SELF);
}
private int GetTabIndexToActivate(string tabsUrl)
{
AccessibleObjectFromWindow(GetDirectUIHWND(_hWnd), OBJID.OBJID_WINDOW, ref _accessible);
CheckForAccessible();
var index = 0;
var ieDirectUIHWND = new TabActivator(_hWnd);
foreach (var accessor in ieDirectUIHWND.Children)
{
foreach (var child in accessor.Children)
{
foreach (var tab in child.Children)
{
var tabUrl = tab.LocationUrl;
if (!string.IsNullOrEmpty(tabUrl))
{
if (tab.LocationUrl.Contains(tabsUrl))
return index;
}
index++;
}
}
}
return -1;
}
private IntPtr GetDirectUIHWND(IntPtr ieFrame)
{
// For IE 8:
var directUI = FindWindowEx(ieFrame, IntPtr.Zero, "CommandBarClass", null);
directUI = FindWindowEx(directUI, IntPtr.Zero, "ReBarWindow32", null);
directUI = FindWindowEx(directUI, IntPtr.Zero, "TabBandClass", null);
directUI = FindWindowEx(directUI, IntPtr.Zero, "DirectUIHWND", null);
if (directUI == IntPtr.Zero)
{
// For IE 9:
//directUI = FindWindowEx(ieFrame, IntPtr.Zero, "WorkerW", "Navigation Bar");
directUI = FindWindowEx(ieFrame, IntPtr.Zero, "WorkerW", null);
directUI = FindWindowEx(directUI, IntPtr.Zero, "ReBarWindow32", null);
directUI = FindWindowEx(directUI, IntPtr.Zero, "TabBandClass", null);
directUI = FindWindowEx(directUI, IntPtr.Zero, "DirectUIHWND", null);
}
return directUI;
}
private static int AccessibleObjectFromWindow(IntPtr hwnd, OBJID idObject, ref IAccessible acc)
{
var guid = new Guid("{618736e0-3c3d-11cf-810c-00aa00389b71}"); // IAccessibleobject obj = null;
object obj = null;
var num = AccessibleObjectFromWindow(hwnd, (uint) idObject, ref guid, ref obj);
acc = (IAccessible) obj;
return num;
}
private static object[] GetAccessibleChildren(IAccessible ao, out int childs)
{
childs = 0;
object[] ret = null;
var count = ao.accChildCount;
if (count > 0)
{
ret = new object[count];
AccessibleChildren(ao, 0, count, ret, out childs);
}
return ret;
}
}
}
是的，这么简单的任务有很多行:)
为了执行它，您将需要：
var ie = new ShellWindows();
// check if ie is open and get first tab of the ie
if (ie.Count > 0)
{
var hWnd = (IntPtr)ie.Item(0).HWND;
new TabActivator(hWnd).ActivateByTabsUrl("www.stackoverflow.com");
}
此代码将焦点设置为具有特定 URL 的选项卡，但您可以将其更改为激活具有特定标题的选项卡等。
于 2012-05-25T23:06:42.300 回答
1
你将不得不写一个附加。
选项卡看起来像是内容窗口，因此您可以使用常规 DOM Window 对象来发现有关当前选项卡的一些信息并做一些事情 - close()、focus()、resizeTo() 等。问题是 Firefox 和其他现代浏览器抑制或由于默认的弹出窗口阻止行为，忽略其中一些事件。此外，出于安全原因，内容无法确定打开了多少个选项卡，或者其中正在运行什么，因此无法对它们进行轮询。您能做的最好的事情是从一个窗口调用 window.opener 以找出另一个打开它的窗口。
获得完整访问权限的唯一方法是编写附加组件。每个浏览器都有自己编写插件的方式，其中一些会比其他的更容易编写。
于 2010-08-18T14:02:36.553 回答