c#抓取网页数据( 从IE浏览器获取当前页面内容可能有多种方式的资料)
优采云 发布时间: 2021-10-02 11:36c#抓取网页数据(
从IE浏览器获取当前页面内容可能有多种方式的资料)
C#从IE浏览器获取当前页面的内容
更新时间：2021年6月24日09:52:49作者：迈克尔·大卫
从IE浏览器获取当前页面内容的方法可能有很多种。今天我介绍其中一个。基本原理：鼠标点击当前ie页面时，获取鼠标坐标位置，根据鼠标位置获取当前页面的句柄，然后根据句柄调用Win32 things获取页面内容。感兴趣的朋友可以参考本文
private void timer1_Tick(object sender, EventArgs e)
{
lock (currentLock)
{
System.Drawing.Point MousePoint = System.Windows.Forms.Form.MousePosition;
if (_leftClick)
{
timer1.Stop();
_leftClick = false;
_lastDocument = GetHTMLDocumentFormHwnd(GetPointControl(MousePoint, false));
if (_lastDocument != null)
{
if (_getDocument)
{
_getDocument = true;
try
{
string url = _lastDocument.url;
string html = _lastDocument.documentElement.outerHTML;
string cookie = _lastDocument.cookie;
string domain = _lastDocument.domain;
var resolveParams = new ResolveParam
{
Url = new Uri(url),
Html = html,
PageCookie = cookie,
Domain = domain
};
RequetResove(resolveParams);
}
catch (Exception ex)
{
System.Windows.MessageBox.Show(ex.Message);
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
}
}
else
{
new MessageTip().Show("xx", "当前页面不是IE浏览器页面，或使用了非IE内核浏览器，如火狐，搜狗等。请使用IE浏览器打开网页");
}
_getDocument = false;
}
else
{
_pointFrm.Left = MousePoint.X + 10;
_pointFrm.Top = MousePoint.Y + 10;
}
}
}
在第11行的gethtmldocumentformhwnd（getpointcontrol（mousepoint，false））分解下，首先从鼠标坐标获取页面句柄：
public static IntPtr GetPointControl(System.Drawing.Point p, bool allControl)
{
IntPtr handle = Win32APIsFull.WindowFromPoint(p);
if (handle != IntPtr.Zero)
{
System.Drawing.Rectangle rect = default(System.Drawing.Rectangle);
if (Win32APIsFull.GetWindowRect(handle, out rect))
{
return Win32APIsFull.ChildWindowFromPointEx(handle, new System.Drawing.Point(p.X - rect.X, p.Y - rect.Y), allControl ? Win32APIsFull.CWP.ALL : Win32APIsFull.CWP.SKIPINVISIBLE);
}
}
return IntPtr.Zero;
}
接下来，根据句柄获取页面内容：
public static HTMLDocument GetHTMLDocumentFormHwnd(IntPtr hwnd)
{
IntPtr result = Marshal.AllocHGlobal(4);
Object obj = null;
Console.WriteLine(Win32APIsFull.SendMessageTimeoutA(hwnd, HTML_GETOBJECT_mid, 0, 0, 2, 1000, result));
if (Marshal.ReadInt32(result) != 0)
{
Console.WriteLine(Win32APIsFull.ObjectFromLresult(Marshal.ReadInt32(result), ref IID_IHTMLDocument, 0, out obj));
}
Marshal.FreeHGlobal(result);
return obj as HTMLDocument;
}
一般原则：
向IE表单发送消息，获取指向IE浏览器（非托管）内存块的指针，然后根据该指针获取htmldocument对象
此方法涉及两个Win32函数：
[System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "SendMessageTimeoutA")]
public static extern int SendMessageTimeoutA(
[InAttribute()] System.IntPtr hWnd,
uint Msg, uint wParam, int lParam,
uint fuFlags,
uint uTimeout,
System.IntPtr lpdwResult);
[System.Runtime.InteropServices.DllImportAttribute("oleacc.dll", EntryPoint = "ObjectFromLresult")]
public static extern int ObjectFromLresult(
int lResult,
ref Guid riid,
int wParam,
[MarshalAs(UnmanagedType.IDispatch), Out]
out Object pObject
);
以上是从IE浏览器获取当前页面内容的详细信息。有关c#获取浏览器页面内容的更多信息，请注意其他相关信息文章
