internal static object CreateInstance(LibraryModule libraryModule, Guid clsid)
{
var classFactory = GetClassFactory(libraryModule, clsid);
var iid = new Guid("00000000-0000-0000-C000-000000000046"); // IUnknown
classFactory.CreateInstance(null, ref iid, out object obj);
return(obj);
}
public static LibraryModule LoadModule(string filePath)
{
var libraryModule = new LibraryModule(Win32.LoadLibrary(filePath), filePath);
if (libraryModule._handle == IntPtr.Zero)
{
int error = Marshal.GetLastWin32Error();
throw new Win32Exception(error, "Cannot load library: " + filePath);
}
return(libraryModule);
}
internal static IClassFactory GetClassFactory(LibraryModule libraryModule, Guid clsid)
{
IntPtr ptr = libraryModule.GetProcAddress("DllGetClassObject");
var callback = (DllGetClassObject)Marshal.GetDelegateForFunctionPointer(ptr, typeof(DllGetClassObject));
var classFactoryIid = new Guid("00000001-0000-0000-c000-000000000046");
var hresult = callback(ref clsid, ref classFactoryIid, out IClassFactory classFactory);
if (hresult != 0)
{
throw new Win32Exception(hresult, "Cannot create class factory");
}
return(classFactory);
}
/// <summary>
/// Creates a new instance of the specified filter from a module.
/// </summary>
/// <typeparam name="TFilter">The type of the filter.</typeparam>
/// <param name="clsid">filter The CLSID.</param>
/// <param name="name">The name.</param>
/// <param name="filterType">Type of the filter.</param>
/// <param name="parserFilter">The parser filter.</param>
internal static void CreateFilter <TFilter>(LibraryModule module, string clsid, string name, ref Type filterType, ref TFilter parserFilter)
{
TraceManager.TraceDebug($"Creating new instance of filter, Name = {name}, CLSID = {clsid}, Module = {module.FilePath}");
try
{
filterType = Type.GetTypeFromCLSID(new Guid(clsid));
parserFilter = (TFilter)ComHelper.CreateInstance(module, new Guid(clsid));
}
catch (Exception ex)
{
TraceManager.TraceError(ex, ex.Message);
throw new NotSupportedException($"Cannot create the filter: Name = {name}, CLSID = {clsid}, Module = {module.FilePath}", ex);
}
}