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Writing Variables via QuickOPC in C# (Visual Studio)

my project is about writing an OPC UA Client, to read and write variables on a Siemens PLC OPC UA Server. I'm using Visual Studio 2017 Enterprise and installed the Quick OPC Toolkit from OPClabs to get started and try to connect. To program the client, I'm using Windows Forms and C#.
Connecting with the server and reading variables is working just fine, but writing them gives me a headache:
1.) Before I started programming on my own, I downloaded the OPC UA Sample Client from the OPC Foundation (if someone needs the download-link just ask, the download is hard to find). I connected to the server and could browse through the variables, but the write function was greyed out/not available.
2.) I started programming a very simple client, but also failed to write variables. Reading via Live Binding (http://opclabs.doc-that.com/files/onlinedocs/QuickOpc/2018.2/User%27s%20Guide%20and%20Reference-QuickOPC/webframe.html#Making%20a%20first%20OPC%20UA%20application%20using%20Live%20Binding.html) is working, also reading them by using easyUAClient.Read() works. I tried to write a variable with this code:
namespace ErsteOPCUAVerbindung{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
var easyUAClient = new EasyUAClient();
easyUAClient.WriteValue("opc.tcp://OpcUaClient:password#192.168.216.1:4840/", "nsu=SinumerikVarProvider;ns=2;s=/NC/_N_NC_TEA_ACX/$MN_PLC_CYCLIC_TIMEOUT", 1);
}
}}
but I keep getting an exception:
OpcLabs.EasyOpc.UA.OperationModel.UAException: "An OPC-UA operation failure with error code -2144010240 (0x80350000) occurred, originating from 'OpcLabs.EasyOpcUA'. The inner OPC-UA service exception with service result 'BadAttributeIdInvalid' contains details about the problem."
{"OPC-UA service result - An error specific to OPC-UA service occurred.\r\n---- SERVICE RESULT ----\r\nStatusCode: {BadAttributeIdInvalid} = 0x80350000 (2150957056)\r\n"}
I have no idea what is causing this. I suspected, that maybe some kind of access restriction is the reason, but I can't find any hints about it in the documentations and besides I'm logged in as administrator anyway.
Has anyone an Idea? Thank you.

I have had one more look at your code, and the way you pass in the user name and password (in the URL itself) is definitely not correct. The way it is given now it is essentially ignored. It may or may not be the cause for the problem with the Write, but it definitely needs to be changed. The proper way of specifying the user name and password would be:
var client = new EasyUAClient();
var endpointDescriptor = new UAEndpointDescriptor("opc.tcp://192.168.216.1:4840/");
endpointDescriptor.UserIdentity = UserIdentity.CreateUserNameIdentity("OpcUaClient", "password");
client.WriteValue(endpointDescriptor, "nsu=SinumerikVarProvider;ns=2;s=/NC/_N_NC_TEA_ACX/$MN_PLC_CYCLIC_TIMEOUT", 1);

Update: I found a documentation, which explained, that the administrator does not have write rights by default and how you can change that. You need to call the methode GiveUserAccess and pass two Arguments, the Username and "SinuWriteAll" (the second one is kind of hidden). I'll try it now with C# and post my solution if it works.

Autodesk.Inventor.Interop.dll on WinServer 64-bit 2012 R2 - interface non registred

i'm trying to develop a very simple web application based on the Autodesk Inventor engine.
I'm developing on Win7 64-bit with Visual Studio 2010 and Inventor 2015 and everything it's working perfectly on debugging but when i publish on the web server i get the error:
HRESULT: 0x800401F3 (CO_E_CLASSSTRING)
and the message
interface string not valid
The C# code line where i receive the error is:
Inventor.Application _invApp = (Inventor.Application)Marshal.GetActiveObject("Inventor.Application");
The full code for my test is the following:
using Inventor;
using System.Runtime.InteropServices;
namespace web_debug_cs
{
public partial class debug_runinventor : Ssytem.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) { startInventorApplication(); }
private void startInventorApplication()
{
string sDebug = string.Empty;
try
{
Inventor.Application _invetorApp = (Inventor.Application)Marshal.GetActiveObject("Inventor.Application");
sDebug = "Success!!!";
}
catch (Exception ex) { sDebug = "UNSUCCESS!<br />" + ex.Message; }
lblAnswer.Text = sDebug;
}
}
}
I get this code directly from the Inventor 2015 guide, but (repeat) on the local machine everything it's ok, but not on the server.
I checked the permission (everyone: full control)
I registred manually with regsvr32 (impossible to register) both on system32 and SysWOW64
I registred on the framework 32 and 64 with regasm (registration success!)
I set the web site to work with 32-bit application
but nothing could solve this issue.
I thought about the possibility to import manually the dll with pInvoke, but with no success...
I googled a lot, i tryed to ask to Autodesk with no success.
I started Inventor on the Server to verify if it works, and it work perfectly!
Could anyone try to help me?
Thanks in advance for any kind reply!
Emanuele

I would not expect this to work due a simple reason: the webpage is running as a service, and Inventor runs as a user-level application. Imagine the following: the web page is requested by 100 clients/browsers, your app will launch Inventor 100 times. But more than that, the webpage is not on the user-level.
The best chance to work would be: your webpage receives a request (let's say create a .ipt file), create a record that the action must be performed (for instance, a new .txt file with instructions or a database entry), a Windows services detects the request and launch Inventor to process it. In this case you'll have a queue where requests are placed by your webpage, but processed later.
But I must say this is not supported nor allowed on the EULA, please review it.

ASP.NET Web Application - on deploy, System.Speech.dll object not getting set to an instance of an object

I have an ASP.NET web application that uses System.Speech to transform text to a WAV file. It works fine locally but when I deploy it to the server, I get the below error message. This is using Windows Server 2012, ASP.NET 4.5, and IIS 8.5:
Object reference not set to an instance of an object.
System.Speech
at System.Speech.Internal.ObjectTokens.RegistryDataKey..ctor(String fullPath, RegistryDataKey copyKey)
at System.Speech.Internal.ObjectTokens.SAPICategories.DefaultDeviceOut()
at System.Speech.Internal.Synthesis.VoiceSynthesis..ctor(WeakReference speechSynthesizer)
at System.Speech.Synthesis.SpeechSynthesizer.get_VoiceSynthesizer()
at QuinnSDS.handlerTransform.<>c__DisplayClass6.<ProcessRequest>b__1()
The code which is generating this error message runs on the server:
if (context.Request.ContentLength > 0)
{
string line = new StreamReader(context.Request.InputStream).ReadToEnd();
// ********* generate wav file voicing the response *****************
// Using Microsoft voices
// initiate new instance of speech synthesizer
Thread t = new Thread(() =>
{
try
{
// The object creation works fine
System.Speech.Synthesis.SpeechSynthesizer synth = new System.Speech.Synthesis.SpeechSynthesizer();
if (synth != null)
{
// The code breaks at synth.GetInstalledVoices() below. It will break any time I try to do anything with the synth object
foreach (System.Speech.Synthesis.InstalledVoice voice in synth.GetInstalledVoices())
{
System.Speech.Synthesis.VoiceInfo info = voice.VoiceInfo;
string voiceName = info.Name;
ws.WriteLine(voiceName);
}
}
}
catch (Exception e)
{
ws.WriteLine(e.Message);
ws.WriteLine(e.Source);
ws.WriteLine(e.StackTrace);
}
//... code continues...
It does not break when the Speech Synthesis object is created; it breaks whenever I try to use that object in any way.
I'm not sure if it's an access issue but I'm pretty new to ASP.NET and IIS and I can't figure out how to give the web app access to the GAC or if that's even what the problem is. I tried changing the property Local Copy for the System.Speech reference to True in Visual Studio, before I deploy the app, but that hasn't worked. I searched online and while the "object reference not set to an instance of an object" seems fairly common, I cannot find any similar issues where it is because of a .NET framework class library...I have run the text-to-speech code locally on the server and it ran fine. I have not run the entire app locally on the server because the web app requires speech input and there is not a microphone on the server.
Any ideas of anything to try would be most welcome!

What user account is the code running under when executed from ASP.NET? If the Speech API is touching the registry like the call stack suggests, it possibly has different permissions than the account you used to run the code manually.
If you can't just make the application pool for your site run with the same account you log into the machine with, I've had some success using Process Monitor to track down this kind of problem before. Basically, execute the code that fails while Process Monitor is running and look for 'ACCESS DENIED' in the 'Result' column (or anything else that looks suspicious). Quickly switching the application pool to use your standard user account will be the fastest way to rule out security or permission related problems though.

Control IIS 7 server from Windows 2003 server programmatically

We run various jobs using a Windows 2003 server. Some of these jobs send app pool commands to web servers running IIS 6 (recycle, start, stop). Now we have a Windows 2008 web server running IIS 7, and we want to send the same commands. This is all done using C#.
This is the code we use to send commands for IIS 6:
var methodToInvoke = "Stop"; // could be "Stop", "Start", or "Recycle"
var co = new ConnectionOptions
{
Impersonation = ImpersonationLevel.Impersonate,
Authentication = AuthenticationLevel.PacketPrivacy
};
var objPath = string.Format("IISApplicationPool.Name='W3SVC/AppPools/{0}'", appPoolName);
var scope = new ManagementScope(string.Format(#"\\{0}\root\MicrosoftIISV2", machineName), co);
using (var mc = new ManagementObject(objPath))
{
mc.Scope = scope;
mc.InvokeMethod(methodToInvoke, null, null);
}
This code doesn't work for IIS 7 due to underlying changes, so we're currently trying this:
using (ServerManager serverManager = ServerManager.OpenRemote(machineName))
{
var appPool = serverManager.ApplicationPools[appPoolName];
if (appPool != null)
{
appPool.Stop(); // or app.Start() or app.Recycle()
serverManager.CommitChanges();
}
}
The above code works fine on my workstation, which runs Windows 7 (and, thus, IIS 7.5). However, it does not work when I deploy this code to our application server. It get this error:
System.InvalidCastException:
Unable to cast COM object of type 'System.__ComObject' to interface type
'Microsoft.Web.Administration.Interop.IAppHostWritableAdminManager'.
This operation failed because the QueryInterface call on the COM component for the
interface with IID '{FA7660F6-7B3F-4237-A8BF-ED0AD0DCBBD9}' failed due to the following error:
Interface not registered (Exception from HRESULT: 0x80040155).
From my research, this is due to the fact that IIS 7 is not available on the Windows Server 2003 server. (I did include the Microsoft.Web.Administration.dll file.)
So my questions are:
Is it possible for the above code for IIS 7 to work at all from a Windows 2003 server?
If no to #1, is there a better way of doing this?

From reading around it doesn't appear to be possible to do what you're looking for. It's not enough to include the dll files.
According to http://forums.iis.net/t/1149274.aspx..
In order to use Microsoft.Web.Administration you need to have IIS installed, at the bare minimum you need to install the Configuration API's which are brought through installing the Management Tools.
Unfortunately there is no SDK that enables this and it has several dependencies on other components that wouldn't let you just take it to another machine and make it work (such as COM objects, DLL's, etc).
I'd be interested in knowing if you've found a way round this.
Thanks

Try controlling the IIS pool with DirectoryEntry instead.
See this topic:
Check the status of an application pool (IIS 6) with C#

Microsoft.Web.Administration, it relies on System.Web.dll which was provided by framework 4, not client profile.

PowerPoint.Application not raising events in C#

I have a simple application written in C# and .Net 2.0 that displays several PowerPoint 2003 files in a loop. (It is going to be used for a information board in our cafeteria) The application works fine on my development machine but when I deploy it to another machine the events I have registered for SlideShowNextSlide and PresentationClose are never fired. I have tried registering the events with this method.
private void InitPPT()
{
app.SlideShowNextSlide += new Microsoft.Office.Interop.PowerPoint.EApplication_SlideShowNextSlideEventHandler(app_SlideShowNextSlide);
app.PresentationClose += new Microsoft.Office.Interop.PowerPoint.EApplication_PresentationCloseEventHandler(app_PresentationClose);
app.SlideShowEnd += new Microsoft.Office.Interop.PowerPoint.EApplication_SlideShowEndEventHandler(app_PresentationClose);
}
And with this method that I found here:
private void InitPPT()
{
IConnectionPointContainer oConnPointContainer = (IConnectionPointContainer)app;
Guid guid = typeof(Microsoft.Office.Interop.PowerPoint.EApplication).GUID;
oConnPointContainer.FindConnectionPoint(ref guid, out m_oConnectionPoint);
m_oConnectionPoint.Advise(this, out m_Cookie);
}
Do I need to register some dll's on the client machine or am I missing something.

I think this was due to the fact that I was trying to run my application from a local user account but impersonate a domain account so I could access network drives. I have changed my application so it only impersonates the domain account while preforming network operations and not at application startup.