我有一个 WinForms 应用程序。就在 Program.cs 中创建实际表单之前,我实例化了一个Autoplay
类。注册成功,在强制性的第一个返回值 65536 之后,但我从来没有接到任何对AllowAutoPlay()
.
我错过了什么吗?
这是代码:
public class RunningObjectTableEntry : IDisposable
{
private const int ROTFLAGS_REGISTRATIONKEEPSALIVE = 1;
private HRESULT cookie;
private IRunningObjectTable rot = null;
private IMoniker monkey = null;
private RunningObjectTableEntry() { }
public RunningObjectTableEntry(object obj)
{
this.AddToROT(obj);
}
public void AddToROT(object obj)
{
int hr = GetRunningObjectTable(0, out rot);
if (hr != 0)
{
throw new COMException("Could not retrieve running object table!", hr);
}
Guid clsid = obj.GetType().GUID;
hr = CreateClassMoniker(ref clsid, out monkey);
if (hr != 0)
{
Marshal.ReleaseComObject(rot);
throw new COMException("Could not create moniker for CLSID/IID \"" + clsid + "\"!", hr);
}
UInt32 iResult = (UInt32)rot.Register(ROTFLAGS_REGISTRATIONKEEPSALIVE, obj, monkey); // Weak reference, but allow any user
if (65536 == iResult)
iResult = (UInt32)rot.Register(ROTFLAGS_REGISTRATIONKEEPSALIVE, obj, monkey);
cookie = (HRESULT)iResult;
}
public void RemoveFromROT()
{
if (cookie != 0)
{
try
{
// Get the running object table and revoke the cookie
rot.Revoke((int)cookie);
cookie = 0;
}
finally
{
if (rot != null) while (Marshal.ReleaseComObject(rot) > 0) ;
}
}
}
[DllImport("ole32.dll", ExactSpelling = true)]
private static extern int GetRunningObjectTable([MarshalAs(UnmanagedType.U4)] int reserved, out IRunningObjectTable pprot);
[DllImport("ole32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
private static extern int CreateClassMoniker([In] ref Guid g, [Out] out IMoniker ppmk);
#region IDisposable Members
public void Dispose()
{
if (null != monkey)
Marshal.ReleaseComObject(monkey);
rot.Revoke((int)cookie);
Marshal.ReleaseComObject(rot);
}
#endregion
}
[ComVisible(true)]
[Guid("331F1768-05A9-4ddd-B86E-DAE34DDC998A")]
[ClassInterface(ClassInterfaceType.None)]
public class Autoplay : IQueryCancelAutoPlay, IDisposable
{
private RunningObjectTableEntry rotEntry;
public Autoplay()
{
rotEntry = new RunningObjectTableEntry(this);
}
public void RemoveFromROT()
{
this.rotEntry?.RemoveFromROT();
}
#region IQueryCancelAutoPlay Members
public int AllowAutoPlay(string pszPath, AutorunContent dwContentType, string pszLabel, int dwSerialNumber)
{
String msgUser = $"AllowAutoPlay: Path={pszPath}, ContentType={dwContentType.ToString()}, Label={pszLabel}, SerialNumber={dwSerialNumber.ToString()}";
System.Diagnostics.Debug.WriteLine(msgUser);
MessageBox.Show(msgUser);
}
#endregion
#region IDisposable Members
public void Dispose()
{
rotEntry.Dispose();
}
#endregion
}
第二次调用的 cookie 很好、一致,但在 131073 或 0x00020001 处很好。
我使用了以下文章:Prevent Autoplay、65536 error和CodeProject。
断点或消息框均不显示。
我正在使用 Visual Studio 2017 在 Windows 10 上运行。
想法?