C# 根据鼠标坐标取网页内成员坐标.ie
有时候你需要后台获取ie浏览器 鼠标所在位置的元素坐标，然而你使用屏幕坐标是不可行的
所以我们需要把坐标转换成浏览器内坐标 然后再通过elementFromPoint获取网页成员。
private void tmrWatcher_Tick(object sender, EventArgs e)
{
IntPtr hWnd = WindowFromPoint(MousePosition);
dynamic document = GetHtmlDocumentByHandle(hWnd);
if (document != null)
{
Rectangle r = GetHtmlElementPoint(hWnd, MousePosition, document); // 根据鼠标坐标取网页成员坐标
Marshal.FinalReleaseComObject(document);
Console.WriteLine(r.X + ":" + r.Y + ":" + r.Width + ":" + r.Height);
}
}
上面是一个时钟tmrWatcher的Tick回调函数，在上面使用了WindowFromPoint函数 主要是获取
MousePosition所在的窗口句柄，然后再通过GetHtmlDocumentByHandle函数(获取文档从句柄)
public static object GetComObjectByHandle(int Msg, Guid riid, IntPtr hWnd)
{
object _ComObject;
int lpdwResult = 0;
if (!SendMessageTimeout(hWnd, Msg, 0, 0, SMTO_ABORTIFHUNG, 1000, ref lpdwResult))
return null;
if (ObjectFromLresult(lpdwResult, ref riid, 0, out _ComObject))
return null;
return _ComObject;
} public object GetHtmlDocumentByHandle(IntPtr hWnd)
{
string buffer = new string('\0', 24);
GetClassName(hWnd, ref buffer, 25);
if (buffer != "Internet Explorer_Server")
return null;
return GetComObjectByHandle(WM_HTML_GETOBJECT, IID_IHTMLDocument, hWnd);
}
实际上与我上次的帖子：http://blog.csdn.net/u012395622/article/details/46404193
并没什么太大的出入，而获取一个网页文档的成员只是简单的调度Mshtml COM接口
public Rectangle GetHtmlElementPoint(IntPtr hWnd, Point point, dynamic document)
{
if (document == null && hWnd != IntPtr.Zero)
return Rectangle.Empty;
ScreenToClient(hWnd, ref point);
dynamic element = document.elementFromPoint(point.X, point.Y);
if (element == null) return Rectangle.Empty;
try
{
Rectangle o = new Rectangle()
{
Y = element.offsetTop,
X = element.offsetLeft,
Width = element.offsetWidth,
Height = element.offsetHeight
};
while (element.offsetParent != null)
{
element = element.offsetParent;
o.Y += element.offsetTop;
o.X += element.offsetLeft;
}
return o;
}
catch
{
return Rectangle.Empty;
}
}
上面代码是实现获取 元素在网页内的一个确切坐标，整体并不是很难阅读的。
之所以while(element.offsetParent != null) { ... }是因为网页始终与客户端不相
同我们不能用常规在Win32操作控件位置那样去看待它 它很麻烦，而且层次
很难分明，所以会造成你根本不知道到底有多宽不过还好，一般计算一个
成员元素在窗口什么位置，只要把父容器的位置加起来就行了。反正有点
解释的不清楚，大家莫见怪
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern bool ScreenToClient(IntPtr hWnd, ref Point lpPoint);
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetClassName(
[In]IntPtr hWnd,
[MarshalAs(UnmanagedType.VBByRefStr)]ref string IpClassName,
[In]int nMaxCount
);
[DllImport("oleacc.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool ObjectFromLresult(
[In]int lResult,
[In]ref Guid riid,
[In]int wParam,
[Out, MarshalAs(UnmanagedType.IUnknown)]out object ppvObject
);
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.I4)]
public static extern int RegisterWindowMessage(
[In]string lpString
);
[DllImport("user32.dll", EntryPoint = "SendMessageTimeoutA", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SendMessageTimeout(
[In]IntPtr MSG,
[In]int hWnd,
[In]int wParam,
[In]int lParam,
[In]int fuFlags,
[In]int uTimeout,
[In, Out]ref int lpdwResult
);
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.SysInt)]
public static extern IntPtr WindowFromPoint(
[In]Point Point
);
public const int SMTO_ABORTIFHUNG = 2;
public readonly static int WM_HTML_GETOBJECT = RegisterWindowMessage("WM_HTML_GETOBJECT");
public readonly static Guid IID_IHTMLDocument = new Guid("626fc520-a41e-11cf-a731-00a0c9082637");