使用 this作为引用,我正在尝试创建一个异步可插入协议(protocol),该协议(protocol)仅对我的应用程序暂时可用(并且未在系统范围内注册)。我正在使用 CoInternetGetSession
然后调用 RegisterNameSpace
来完成它。但是,当我调用 RegisterNameSpace
时,我收到 AccessViolation 异常:Attempting to read or write protected memory
。
知道发生了什么吗?
我的代码是这样的:
[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("00000001-0000-0000-C000-000000000046")]
[ComVisible(true)]
public interface IClassFactory
{
void CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject);
void LockServer(bool fLock);
}
/* Custom class to act as a class factory that create's an instance of the protocol */
[Guid("0b9c4422-2b6e-4c2d-91b0-9016053ab1b1")]
[ComVisible(true),ClassInterface(ClassInterfaceType.AutoDispatch)]
public class PluggableProtocolFactory : IClassFactory
{
public Type AppType;
public PluggableProtocolFactory(Type t)
{
this.AppType = t;
}
public void CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject)
{
riid = ProtocolSupport.GetGuid(this.AppType);
IInternetProtocol p = Activator.CreateInstance(this.AppType) as IInternetProtocol;
ppvObject = Marshal.GetComInterfaceForObject(p, typeof(IInternetProtocol));
}
public void LockServer(bool fLock)
{
var b = fLock;
}
}
[ComVisible(true)]
[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
[Guid("79eac9e7-baf9-11ce-8c82-00aa004ba90b")]
public interface IInternetSession
{
void CreateBinding(); // Not Implemented
void GetCache(); // Not Implemented
void GetSessionOption(); // Not Implemented
void RegisterMimeFilter([MarshalAs(UnmanagedType.Interface)] IClassFactory pCF, ref Guid rclsid, [MarshalAs(UnmanagedType.LPWStr)] string pwzType);
void RegisterNameSpace([MarshalAs(UnmanagedType.Interface)] IClassFactory pCF, ref Guid rclsid, [MarshalAs(UnmanagedType.LPWStr)] string pwzProtocol,
UInt32 cPatterns, [MarshalAs(UnmanagedType.LPArray,ArraySubType=UnmanagedType.LPWStr)] string[] ppwzPatterns, UInt32 dwReserved);
void SetCache(); // Not Implemented
void SetSessionOption(); // Not Implemented
void UnregisterMimeFilter(IClassFactory pCF, [MarshalAs(UnmanagedType.LPWStr)] string pwzType);
void UnregisterNameSpace(IClassFactory pCF, [MarshalAs(UnmanagedType.LPWStr)] string pwzProtocol);
}
[ComVisible(false)] public interface IComRegister
{
void Register(Type t);
void Unregister(Type t);
}
[ComVisible(false), AttributeUsage(AttributeTargets.Class, AllowMultiple=true) ]
public class AsyncProtocolAttribute : Attribute, IComRegister
{
public string Name;
public string Description;
[DllImport("urlmon.dll",PreserveSig=false)]
public static extern int CoInternetGetSession(UInt32 dwSessionMode /* = 0 */, ref IInternetSession ppIInternetSession, UInt32 dwReserved /* = 0 */);
public void Register(Type t)
{
IInternetSession session = null;
CoInternetGetSession(0, ref session, 0);
Guid g = new Guid("79EAC9E4-BAF9-11CE-8C82-00AA004BA90B");
session.RegisterNameSpace(new PluggableProtocolFactory(t), ref g, this.Name, 0, null, 0);
}
永远不会调用 PluggableProtocolFactory 中的 CreateInstance
方法。 (那里的断点永远不会被击中)所以 RegisterNameSpace
方法内部发生了其他事情。
我尝试以管理员和普通用户身份运行。两次都出现同样的错误。
最佳答案
您在 RegisterNameSpace 方法中调用 PluggableProtocolFactory 的构造函数,而不是 CreateInstance 方法。我认为这就是您的问题所在,从来没有创建要传递给您的方法的 IInternetProtocol 实例。
关于c# - 异步可插入协议(protocol),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2013050/