使用web浏览器.NET控件在网页上放大 [英] Zoom in on a web page using WebBrowser .NET control
问题描述
在IE7中有内置的放大功能（显示在状态栏上），使您可以放大到400％。我使用的演示/模拟应用程序中的web浏览器的.NET控件，需要放大网页上。这是在所有可能的？
In IE7 there's a "zoom" feature built-in (show in the status bar), allowing you to zoom in up to 400%. I'm using the WebBrowser .NET control in a demo/simulation app, and need to zoom in on a web page. Is this at all possible?
（我不想简单地把页面的图片，放大，因为我需要使用页面上的链接和按钮）。
(I don't want to simply take a picture of the page and enlarge it, as I need to use the links and buttons on the page).
我使用.NET 2.0，如果它很重要。
I'm using .NET 2.0 if it matters.
推荐答案
似乎有在的 IE变焦 涉及覆盖 AttachInterfaces 和 DetachInterfaces 在 web浏览器获得的IWebBrowser2 接口，然后调用 ExecWB 与 OLECMDID_OPTICAL_ZOOM 。
There appears to be a solution at IE Zoom that involves overriding AttachInterfaces and DetachInterfaces in the WebBrowser to get a IWebBrowser2 interface, and then calling ExecWB with OLECMDID_OPTICAL_ZOOM.
我已经试过了样品code ，它似乎工作;的（有删节）相关类看起来是这样的：
I've tried his sample code and it appears to work; the (abridged) relevant class looks like this:
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;
}
}
}
}
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