20

在 IE7 中内置了“缩放”功能(显示在状态栏中),允许您放大 400%。我在演示/模拟应用程序中使用 WebBrowser .NET 控件,并且需要放大网页。这是可能吗?

(我不想简单地给页面拍照并放大,因为我需要使用页面上的链接和按钮)。

如果重要的话,我正在使用 .NET 2.0。

4

6 回答 6

32

IE Zoom似乎有一个解决方案,涉及覆盖AttachInterfacesDetachInterfacesWebBrowser中获取IWebBrowser2接口,然后ExecWB使用OLECMDID_OPTICAL_ZOOM.

我试过他的示例代码,它似乎工作;(删节的)相关类如下所示:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ZoomBrowser
{
    public partial class MyBrowser : WebBrowser
    {
        #region enums
        public enum OLECMDID
        {
            // ...
            OLECMDID_OPTICAL_ZOOM = 63,
            OLECMDID_OPTICAL_GETZOOMRANGE = 64,
            // ...
        }

        public enum OLECMDEXECOPT
        {
            // ...
            OLECMDEXECOPT_DONTPROMPTUSER,
            // ...
        }

        public enum OLECMDF
        {
            // ...
            OLECMDF_SUPPORTED = 1
        }
        #endregion

        #region IWebBrowser2
        [ComImport, /*SuppressUnmanagedCodeSecurity,*/
         TypeLibType(TypeLibTypeFlags.FOleAutomation | 
                     TypeLibTypeFlags.FDual |       
                     TypeLibTypeFlags.FHidden), 
         Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E")]
        public interface IWebBrowser2
        {
            [DispId(100)]  void GoBack();
            [DispId(0x65)] void GoForward();
            [DispId(0x66)] void GoHome();
            [DispId(0x67)] void GoSearch();
            [DispId(0x68)] void Navigate([In] string Url, 
                                         [In] ref object flags, 
                                         [In] ref object targetFrameName, 
                                         [In] ref object postData, 
                                         [In] ref object headers);
            [DispId(-550)] void Refresh();
            [DispId(0x69)] void Refresh2([In] ref object level);
            [DispId(0x6a)] void Stop();
            [DispId(200)]  object Application 
                           { [return: 
                              MarshalAs(UnmanagedType.IDispatch)] get; }
            [DispId(0xc9)] object Parent 
                           { [return: 
                              MarshalAs(UnmanagedType.IDispatch)] get; }
            [DispId(0xca)] object Container 
                           { [return: 
                              MarshalAs(UnmanagedType.IDispatch)] get; }
            [DispId(0xcb)] object Document 
                           { [return: 
                              MarshalAs(UnmanagedType.IDispatch)] get; }
            [DispId(0xcc)] bool TopLevelContainer { get; }
            [DispId(0xcd)] string Type { get; }
            [DispId(0xce)] int Left { get; set; }
            [DispId(0xcf)] int Top { get; set; }
            [DispId(0xd0)] int Width { get; set; }
            [DispId(0xd1)] int Height { get; set; }
            [DispId(210)]  string LocationName { get; }
            [DispId(0xd3)] string LocationURL { get; }
            [DispId(0xd4)] bool Busy { get; }
            [DispId(300)]  void Quit();
            [DispId(0x12d)] void ClientToWindow(out int pcx, out int pcy);
            [DispId(0x12e)] void PutProperty([In] string property, 
                                             [In] object vtValue);
            [DispId(0x12f)] object GetProperty([In] string property);
            [DispId(0)] string Name { get; }
            [DispId(-515)] int HWND { get; }
            [DispId(400)] string FullName { get; }
            [DispId(0x191)] string Path { get; }
            [DispId(0x192)] bool Visible { get; set; }
            [DispId(0x193)] bool StatusBar { get; set; }
            [DispId(0x194)] string StatusText { get; set; }
            [DispId(0x195)] int ToolBar { get; set; }
            [DispId(0x196)] bool MenuBar { get; set; }
            [DispId(0x197)] bool FullScreen { get; set; }
            [DispId(500)] void Navigate2([In] ref object URL, 
                                         [In] ref object flags, 
                                         [In] ref object targetFrameName, 
                                         [In] ref object postData, 
                                         [In] ref object headers);
            [DispId(0x1f5)] OLECMDF QueryStatusWB([In] OLECMDID cmdID);
            [DispId(0x1f6)] void ExecWB([In] OLECMDID cmdID, 
                                        [In] OLECMDEXECOPT cmdexecopt, 
                                        ref object pvaIn, IntPtr pvaOut);
            [DispId(0x1f7)] void ShowBrowserBar([In] ref object pvaClsid, 
                                                [In] ref object pvarShow, 
                                                [In] ref object pvarSize);
            [DispId(-525)] WebBrowserReadyState ReadyState { get; }
            [DispId(550)] bool Offline { get; set; }
            [DispId(0x227)] bool Silent { get; set; }
            [DispId(0x228)] bool RegisterAsBrowser { get; set; }
            [DispId(0x229)] bool RegisterAsDropTarget { get; set; }
            [DispId(0x22a)] bool TheaterMode { get; set; }
            [DispId(0x22b)] bool AddressBar { get; set; }
            [DispId(0x22c)] bool Resizable { get; set; }
        }
        #endregion

        private IWebBrowser2 axIWebBrowser2;

        public MyBrowser()
        {           
        }

        protected override void AttachInterfaces(
            object nativeActiveXObject)
        {
            base.AttachInterfaces(nativeActiveXObject);
            this.axIWebBrowser2 = (IWebBrowser2)nativeActiveXObject;
        }

        protected override void DetachInterfaces()
        {
            base.DetachInterfaces();
            this.axIWebBrowser2 = null;
        }

        public void Zoom(int factor)
        {
            object pvaIn = factor;
            try
            {
                this.axIWebBrowser2.ExecWB(OLECMDID.OLECMDID_OPTICAL_ZOOM,
                   OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, 
                   ref pvaIn, IntPtr.Zero);
            }
            catch (Exception)
            {
                throw;
            }
        }
    }
}
于 2009-04-10T17:08:45.680 回答
17

简单提示:

//Zoom IN
webBrowser1.Focus();
SendKeys.Send("^{+}"); // [CTRL]+[+]

//Zoom OUT
webBrowser1.Focus();
SendKeys.Send("^-"); // [CTRL]+[-]

//Zoom 100%
webBrowser1.Focus();
SendKeys.Send("^0"); // [CTRL]+[0]
于 2013-01-09T17:24:42.123 回答
14

这对我有用:

int zoomFactor = 300;
((SHDocVw.WebBrowser)webBrowser1.ActiveXInstance).ExecWB(SHDocVw.OLECMDID.OLECMDID_OPTICAL_ZOOM,
    SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, zoomFactor, IntPtr.Zero);

似乎只有在加载文档后才能做到这一点。

于 2012-10-16T08:08:10.170 回答
11

您可以使用 CSS:

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        webBrowser1.Document.Body.Style = "zoom:50%";
    }
于 2015-04-21T06:53:16.730 回答
2

请注意,您传递给 Zoom 函数的因子值假定值 100 对应于网页的“正常”大小。更高的因子值意味着您正在“放大”,因此页面看起来更大。较小的因子值意味着您正在“缩小”,因此页面看起来更小。我发现因子之间的合理增量是 10。

于 2011-04-08T21:26:09.523 回答
1

对于遇到与我相同的问题的任何人,这是对 Gloupi 答案的修改,它应该适用于更多国际系统,其中加号和减号键位于不同位置,使用数字键盘符号键。这也修复了 dvorak 布局的放大和缩小。

// zoom in
webBrowser1.Focus();
SendKeys.Send("^{ADD}");

// zoom out
webBrowser1.Focus();
SendKeys.Send("^{SUBTRACT}");

// zoom reset
webBrowser1.Focus();
SendKeys.Send("^0");
于 2017-01-30T10:06:31.430 回答