实现 IDispatch::Invoke 由 WebBrowser 控件调用 [英] Implement IDispatch::Invoke to be called by a WebBrowser control
问题描述
我正在尝试按照他们在this 控制下载和执行 部分中的文章.我了解在该上下文中的 Web Browser Control 不是 .NET 的 WebBrowser.
I'm trying to do what they explain on this article in the Controlling Download and Execution section. I understand the Web Browser Control in that context is not .NET's WebBrowser.
我想要做的是控制 WebBrowser 控件下载的内容.我一直在寻找这个，并且总是在 csEXWB 中找到，它有一个我无法破译的巨大代码.
What I'm trying to do is to gain control over what the WebBrowser control downloads. I've been searching for this a lot and always en up in the csEXWB, which has a huge code that I just cannot decipher.
到目前为止我所做的是继承.NET的WebBrowser，通过使用[ComVisible(true)]属性使我继承的类com可见，添加这个方法到我的班级(取自 csEXWB):
What I've done so far is inherit .NET's WebBrowser, make my inherited class com visible by using the [ComVisible(true)] attribute, add this method to my class (taken from csEXWB):
[DispId(HTMLDispIDs.DISPID_AMBIENT_DLCONTROL)]
public int Idispatch_AmbiantDlControl_Invoke_Handler()
{
return (int)m_DLCtlFlags;
}
然后调用这行代码，其中Browser是我派生类的一个实例:
And then call this line of code, where Browser is an instance of my derived class:
IfacesEnumsStructsClasses.IOleControl oleControl = Browser.ActiveXInstance as IfacesEnumsStructsClasses.IOleControl;
oleControl.OnAmbientPropertyChange(IfacesEnumsStructsClasses.HTMLDispIDs.DISPID_AMBIENT_DLCONTROL);
所以我希望 oleControl 会调用我的 Idispatch_AmbiantDlControl_Invoke_Handler 方法，但它不会.我不知道如何，这可能是我的代码所缺少的，oleControl 是否应该知道在哪个对象上调用我的 Idispatch_AmbiantDlControl_Invoke_Handler 方法.
So what I'm hoping is that the oleControl will call my Idispatch_AmbiantDlControl_Invoke_Handler method, which it doesn't. I don't know how, and this is probably what my code is missing, is the oleControl supposed to know on which object to call my Idispatch_AmbiantDlControl_Invoke_Handler method.
我上面链接的文章说的是它会调用你的IDispatch::Invoke.你的是什么意思.我如何告诉 oleControl 哪个对象是我的 IDispatch.希望我说的有道理.
What the article I linked above says is it will call your IDispatch::Invoke. What does it mean by your. How do I tell oleControl which object is my IDispatch. Hope I'm making any sense.
推荐答案
这是一个自定义的 WebBrowser，允许您更改 DLCONTROL 标志.
Here is a customized WebBrowser that allows you to change the DLCONTROL flags.
这是一个示例代码:
public partial class Form1 : Form
{
private MyWebBrowser _webBrowser;
public Form1()
{
InitializeComponent();
_webBrowser = new MyWebBrowser();
_webBrowser.Dock = DockStyle.Fill;
Controls.Add(_webBrowser);
}
private void button1_Click(object sender, EventArgs e)
{
_webBrowser.DownloadControlFlags = (int)WebBrowserDownloadControlFlags.DOWNLOADONLY;
_webBrowser.Navigate("http://mysamplewebsite");
}
}
以及自定义的 WebBrowser 代码:
And the customized WebBrowser code:
public class MyWebBrowser : WebBrowser
{
private const int DISPID_AMBIENT_DLCONTROL = -5512;
private int _downloadControlFlags;
// we want our site class, not the default one
protected override WebBrowserSiteBase CreateWebBrowserSiteBase()
{
return new MyWebBrowserSite(this);
}
[DispId(DISPID_AMBIENT_DLCONTROL)]
public int DownloadControlFlags
{
get
{
return _downloadControlFlags;
}
set
{
if (_downloadControlFlags == value)
return;
_downloadControlFlags = value;
IOleControl ctl = (IOleControl)ActiveXInstance;
ctl.OnAmbientPropertyChange(DISPID_AMBIENT_DLCONTROL);
}
}
protected class MyWebBrowserSite : WebBrowserSite, IReflect
{
private Dictionary<int, PropertyInfo> _dispidCache;
private MyWebBrowser _host;
public MyWebBrowserSite(MyWebBrowser host)
: base(host)
{
_host = host;
}
object IReflect.InvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target, object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] namedParameters)
{
object ret = null;
// Check direct IDispatch call using a dispid (see http://msdn.microsoft.com/en-us/library/de3dhzwy.aspx)
const string dispidToken = "[DISPID=";
if (name.StartsWith(dispidToken))
{
int dispid = int.Parse(name.Substring(dispidToken.Length, name.Length - dispidToken.Length - 1));
if (_dispidCache == null)
{
// WebBrowser has many properties, so we build a dispid cache on it
_dispidCache = new Dictionary<int, PropertyInfo>();
foreach (PropertyInfo pi in _host.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
if ((!pi.CanRead) || (pi.GetIndexParameters().Length > 0))
continue;
object[] atts = pi.GetCustomAttributes(typeof(DispIdAttribute), true);
if ((atts != null) && (atts.Length > 0))
{
DispIdAttribute da = (DispIdAttribute)atts[0];
_dispidCache[da.Value] = pi;
}
}
}
PropertyInfo property;
if (_dispidCache.TryGetValue(dispid, out property))
{
ret = property.GetValue(_host, null);
}
}
return ret;
}
FieldInfo[] IReflect.GetFields(BindingFlags bindingAttr)
{
return GetType().GetFields(bindingAttr);
}
MethodInfo[] IReflect.GetMethods(BindingFlags bindingAttr)
{
return GetType().GetMethods(bindingAttr);
}
PropertyInfo[] IReflect.GetProperties(BindingFlags bindingAttr)
{
return GetType().GetProperties(bindingAttr);
}
FieldInfo IReflect.GetField(string name, BindingFlags bindingAttr)
{
throw new NotImplementedException();
}
MemberInfo[] IReflect.GetMember(string name, BindingFlags bindingAttr)
{
throw new NotImplementedException();
}
MemberInfo[] IReflect.GetMembers(BindingFlags bindingAttr)
{
throw new NotImplementedException();
}
MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr)
{
throw new NotImplementedException();
}
MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers)
{
throw new NotImplementedException();
}
PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers)
{
throw new NotImplementedException();
}
PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr)
{
throw new NotImplementedException();
}
Type IReflect.UnderlyingSystemType
{
get { throw new NotImplementedException(); }
}
}
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("B196B288-BAB4-101A-B69C-00AA00341D07")]
internal interface IOleControl
{
void Reserved0();
void Reserved1();
void OnAmbientPropertyChange(int dispID);
void Reserved2();
}
}
[Flags]
public enum WebBrowserDownloadControlFlags: uint
{
DLIMAGES = 0x00000010,
VIDEOS = 0x00000020,
BGSOUNDS = 0x00000040,
NO_SCRIPTS = 0x00000080,
NO_JAVA = 0x00000100,
NO_RUNACTIVEXCTLS = 0x00000200,
NO_DLACTIVEXCTLS = 0x00000400,
DOWNLOADONLY = 0x00000800,
NO_FRAMEDOWNLOAD = 0x00001000,
RESYNCHRONIZE = 0x00002000,
PRAGMA_NO_CACHE = 0x00004000,
NO_BEHAVIORS = 0x00008000,
NO_METACHARSET = 0x00010000,
URL_ENCODING_DISABLE_UTF8 = 0x00020000,
URL_ENCODING_ENABLE_UTF8 = 0x00040000,
NOFRAMES = 0x00080000,
FORCEOFFLINE = 0x10000000,
NO_CLIENTPULL = 0x20000000,
SILENT = 0x40000000,
OFFLINEIFNOTCONNECTED = 0x80000000,
OFFLINE = OFFLINEIFNOTCONNECTED,
}
这篇关于实现 IDispatch::Invoke 由 WebBrowser 控件调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
