CallControlAPI - issues with tcxpscom_native.dll

[HarryLAF]

I am working on an a service using the CallControlAPI under .NET Core 2.0 and a Fresh install of latest 3CX on Windows.

The following code when run with the 3cxpscomcpp2.dll included as a reference with copy local on errors on run with the following message:
System.DllNotFoundException: 'Unable to load DLL 'tcxpscom_native': The specified module could not be found. (Exception from HRESULT: 0x8007007E)'

    class Program
    {
        private static string _instanceBinPath;

        private static PhoneSystem Bootstrap(string filePath)
        {
            {
                var a = new Random(Environment.TickCount);
                PhoneSystem.ApplicationName = "LAFCallControl"; //any name
                PhoneSystem.ApplicationName = PhoneSystem.ApplicationName + a.Next().ToString();
            }
            var portString = Utilities.GetKeyValue("ConfService", "ConfPort", filePath);
            PhoneSystem.CfgServerHost = "127.0.0.1";
            if (!string.IsNullOrEmpty(portString))
            {
                var port = int.Parse(portString.Trim());
                PhoneSystem.CfgServerPort = port;
            }

            var user = Utilities.GetKeyValue("ConfService", "confUser", filePath);
            if (!string.IsNullOrEmpty(user)) PhoneSystem.CfgServerUser = user;
            var pass = Utilities.GetKeyValue("ConfService", "confPass", filePath);
            if (!string.IsNullOrEmpty(pass)) PhoneSystem.CfgServerPassword = pass;

            var dns = PhoneSystem.Root.GetDN(); //Access PhoneSystem.Root to initialize ObjectModel
            if (dns != null)
            {
                Console.WriteLine("Setup Complete");
                return PhoneSystem.Root;
            }

            throw new Exception("Unable to Bootstrap PhoneSystem");
        }

        private static void Main()
        {
            PhoneSystem phoneSystem;

            try
            {
                // load 3cx configs
                var filePath = @"C:\Program Files\3CX Phone System\Instance1\Bin\3CXPhoneSystem.ini";
                if (!File.Exists(filePath)) throw new Exception("Cannot find 3CXPhoneSystem.ini");
                Console.WriteLine("Config Found at " + filePath);

                // load 3cx dll
                _instanceBinPath = Path.Combine(Utilities.GetKeyValue("General", "AppPath", filePath), "Bin");
                foreach (string dll in Directory.GetFiles(@"C:\Program Files\3CX Phone System\Instance1\Bin", "*.dll", SearchOption.TopDirectoryOnly))
                {
                    try
                    {
                        Assembly loadedAssembly = Assembly.LoadFile(dll);
                    }
                    catch (FileLoadException loadEx)
                    {
                        Console.WriteLine(dll + " failed load, " + loadEx.Message);
                    } // The Assembly has already been loaded.
                    catch (BadImageFormatException imgEx)
                    {
                        Console.WriteLine(dll  + " failed load, " + imgEx.Message);
                    } // If a BadImageFormatException exception is thrown, the file is not an assembly.
                }

                //AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

                // initialise "connection" to the phone system
                Console.WriteLine("Bootstrap");
                phoneSystem = Bootstrap(filePath);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                throw;
            }

            // do the things to the phone system
        }

When including the tcxpscom_native.dll as a reference in the same way as 3cxpscomcpp2.dll the same error occurs. at run time and when building the following message is displayed:
warning MSB3246: Resolved file has a bad image, no metadata, or is otherwise inaccessible. Could not load file or assembly 'tcxpscom_native.dll' or one of its dependencies. The module was expected to contain an assembly manifest.

I have read elsewhere that including sl.dll is also required however when trying this the error and build output are the same.

Does anyone have any idea what is going on?

 

[edossantos]

Hello @HarryLAF,

In your project you just need to have a reference to 3cxpscomcpp2.dll. But, in your project output you need to copy the files sl.dll and tcxpscom_native.dll, so they're available when you run your app.

Kind regards.

 

[HarryLAF]

Thank you for the prompt reply - solved my problem