我正在尝试按照他们在 this 上的说明进行操作控制下载和执行
部分中的文章。我了解该上下文中的 Web Browser Control
不是 .NET 的 WebBrowser
。
我想做的是控制 WebBrowser
控制下载的内容。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。
到目前为止我所做的是继承.NET 的WebBrowser
,使用[ComVisible(true)]
属性使我继承的类com 可见,添加此方法到我的类(class)(取自 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:
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,但事实并非如此。我不知道 oleControl
应该如何知道在哪个对象上调用我的 Idispatch_AmbiantDlControl_Invoke_Handler
方法,这可能是我的代码所缺少的。
我上面链接的文章说的是它将调用您的 IDispatch::Invoke
。 your
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。
最佳答案
这是一个自定义的 WebBrowser,允许您更改 DLCONTROL 标志。
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:
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,
}
关于c# - 实现 IDispatch::Invoke 以供 WebBrowser 控件调用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7608550/