Hello.

I will send you an evaluation license key to the email address you have used to register on the forums.

Any commercial license is for versions thar are "up to" the version that is current at the time of purchase (or 1/2/3/4/5 years later, if you also purchase Upgrade Assurance). So, for example, if you have purchased today, the current version is 2022.2, you would receive a license key that works with version 2022.2, but also any older version (including 2019.2). But we do not officially support the older versions, which means that if something goes wrong, and you are using an older version and the problem does not happen with the current version, you might be out of luck.

Best regards

Hello.

To test it out, you do not need to purchase anything, it works the built-in trial license (or, if it reports licensing error because it is one of the older QuickOPC versions, we can send you an evaluation license key, free of charge - just ask).

For actual development and production, you need QuickOPC Enterprise (opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User's...e.html#Product%20Editions.html ); most customers are fine with Single Developer + Runtime Free license (www.opclabs.com/purchase/license-types ).

Best regards.

Hello,
thank you for the additional information.

There are many ways to use COM objects from C/C++. If you are accustomed to one way, you can probably continue doing so. For example, an equivalent of CreateDispatch("Excel.Application") with QuickOPC-UA would be CreateDispatch("OpcLabs.EasyOpc.UA.EasyUAClient") (the ProgIDs are in the Reference documentation; for this particular object, here: opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...bs_EasyOpcUA~EasyUAClient.html ).

In our own examples we do it differently, see e.g. opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...Read%20a%20single%20value.html :

 

// This example shows how to read value of a single node, and display it.

 

#include "stdafx.h"  // Includes "QuickOpc.h", and other commonly used files

#include "ReadValue.h"

 

namespace _EasyUAClient

{

  void ReadValue::Main()

  {

    // Initialize the COM library

    CoInitializeEx(NULL, COINIT_MULTITHREADED);

    {

      // Instantiate the client object

      _EasyUAClientPtr ClientPtr(__uuidof(EasyUAClient));

 

      // Perform the operation

      _variant_t value = ClientPtr->ReadValue(

        //L"opcua.demo-this.com:51211/UA/SampleServer", 

        L"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer",

        L"nsu=http://test.org/UA/Data/ ;i=10853");

 

      // Display results

      _variant_t vString;

      vString.ChangeType(VT_BSTR, &value);

      _tprintf(_T("value: %s\n"), (LPCTSTR)CW2CT((_bstr_t)vString));

    }

     // Release all interface pointers BEFORE calling CoUninitialize()

    CoUninitialize();

  }

}

 

 

The missing piece that causes your error might be the argument in _EasyUAClientPtr ClientPtr(__uuidof(EasyUAClient)). Please add that to see if it helps.

Best regards

Hello.

Can you still post more details about the errors? I doubt that "invalid variable type" is the full message text. And, is that a C++ runtime exception, or what? If so, what is its type (such as COleException)? Ideally, please post a screenshot from the debugger.

Also, have you tried the same code but with our demo server and a node from it (such as in our ReadValue example)? If so, did it work with our server?

Best regards