public ClassFactoryRegistration(Type type, CLSID clsId)
{
ClassFactory factory = new ClassFactory(type);
IntPtr pFactory = Marshal.GetIUnknownForObject(factory);
HRESULT result = ComAPI.CoRegisterClassObject(ref clsId, pFactory,
CLSCTX_INPROC_SERVER, REGCLS_MULTIPLEUSE, out _classRegister);
if (result != ComAPI.S_OK)
{
throw new InvalidOperationException("CoRegisterClassObject failed.");
}
}
internal static HRESULT DllGetClassObject(CLSID clsid, IID iid, out IntPtr ppunk)
{
if (iid != ComAPI.guidIClassFactory)
{
ppunk = IntPtr.Zero;
return ComAPI.E_INVALIDARG;
}
foreach (ExcelComClassType comClass in registeredComClassTypes)
{
if (comClass.ClsId == clsid)
{
ClassFactory factory = new ClassFactory(comClass);
IntPtr punkFactory = Marshal.GetIUnknownForObject(factory);
HRESULT hrQI = Marshal.QueryInterface(punkFactory, ref iid, out ppunk);
Marshal.Release(punkFactory);
if (hrQI == ComAPI.S_OK)
{
return ComAPI.S_OK;
}
else
{
return ComAPI.E_UNEXPECTED;
}
}
}
ppunk = IntPtr.Zero;
return ComAPI.CLASS_E_CLASSNOTAVAILABLE;
}
static bool TryGetComClassType(CLSID clsId, out ComAPI.IClassFactory factory)
{
// Check among the persistently registered classes
foreach (ExcelComClassType comClass in registeredComClassTypes)
{
if (comClass.ClsId == clsId)
{
factory = new ClassFactory(comClass);
return true;
}
}
factory = null;
return false;
}