利用WM_GETTEXT消息获取谷歌浏览器地址栏内容。

所有要用到的API

[DllImport("user32.dll")]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("User32.dll")]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
static extern int EnumWindows(EnumWindowsProc hWnd, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int GetWindowText(IntPtr hWnd, StringBuilder lpText, int nCount);
[DllImport("user32.dll")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, StringBuilder lParam);

 

WM_GETTEXT消息常量：

private const int WM_GETTEXT = 0x00D;

由于每打开一个网页谷歌浏览器的标题就会发生一次变化所以，我们不能用FindWindow来获取谷歌浏览器的句柄。

这里我使用了EnumWindows这个API，具体请自行百度。

声明一个委托（回调函数）

delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

 

定义委托内容：

static bool FindChrom(IntPtr hWnd, IntPtr lParam)
{

//分配空间

var sb = new StringBuilder(256);

GetWindowText(hWnd, sb, sb.Capacity);

//注意某些窗口没有标题

if (sb.ToString() != String.Empty)
{
if ((sb.ToString().IndexOf("Google Chrome")) != -1)
{
if (hWnd != IntPtr.Zero)
{
IntPtr tb = FindWindowEx(hWnd, new IntPtr(0), "Chrome_OmniboxView", "");
StringBuilder strbld = new StringBuilder(2083);
SendMessage(tb, WM_GETTEXT, 2083, strbld);
_url = strbld.ToString();
}
return false;
}
}
//回调函数有返回值

return true;

}

这里的_url用来存放地址栏的地址，其中2083是url地址有效长度。通过枚举所有顶层窗口，并通过标题判断，获取谷歌浏览器的句柄。其中hWnd参数表示当前枚举窗口的句柄。返回值为true则继续枚举，返回值为false则停止枚举。

 

完整代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace 禁止登陆指定网站
{
class WindowControlsText
{
//函数指针类型

delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

[DllImport("user32.dll")]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("User32.dll")]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
static extern int EnumWindows(EnumWindowsProc hWnd, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int GetWindowText(IntPtr hWnd, StringBuilder lpText, int nCount);
[DllImport("user32.dll")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, StringBuilder lParam);
private const int WM_GETTEXT = 0x00D;
private static string _url;

public string GetWindowText()
{
//IntPtr chrom = FindWindow("Chrome_WidgetWin_1", "百度一下，你就知道 - Google Chrome");

IntPtr chrom=IntPtr.Zero;
EnumWindowsProc enwdproc=new EnumWindowsProc(FindChrom);

if (EnumWindows(enwdproc, IntPtr.Zero) >= 0)
return _url;
else
return null;
}

static bool FindChrom(IntPtr hWnd, IntPtr lParam)
{

//分配空间

var sb = new StringBuilder(256);

GetWindowText(hWnd, sb, sb.Capacity);

//注意某些窗口没有标题

if (sb.ToString() != String.Empty)
{
if ((sb.ToString().IndexOf("Google Chrome")) != -1)
{
if (hWnd != IntPtr.Zero)
{
IntPtr tb = FindWindowEx(hWnd, new IntPtr(0), "Chrome_OmniboxView", "");
StringBuilder strbld = new StringBuilder(2083);
SendMessage(tb, WM_GETTEXT, 2083, strbld);
_url = strbld.ToString();
}
return false;
}
}
//回调函数有返回值

return true;

}

}
}

这里的Chrome_OmniboxView是谷歌浏览器地址栏控件的所属类，通过spy++找到的。

窗口部分实现代码，通过定时器捕捉地址变化：

DispatcherTimer timer2 = new DispatcherTimer();
private void Button_Click_2(object sender, RoutedEventArgs e)
{
timer2.Interval = TimeSpan.FromMilliseconds(500);	//获取或设置计时器刻度之间的时间段。
timer2.Tick += timer_Tick2;				//超过计时器间隔时发生。
timer2.Start();
}

private void timer_Tick2(object sender, object e)
{
WindowControlsText wct = new WindowControlsText();
string url = wct.GetWindowText();
tbUrl.Text = url;
}