ActiveX with UareU FingerPrint 4500 Issue

[UrieelDM]

Hi LabVIEW Community;

I'm trying to communicate LabVIEW with Digital Persona 4500. Now i'm using Activex with Property Node and Invoke Node but I have a problem.... 

I dont know if is this a LabVIEW Issue or I have to have a previous configuration of the parameters. 

Im reading the guide of the Biometric fingerprint and all should be OK, but always is the same problem 

"Object reference not set to an instance of an object. "

Error -2147467261 occurred at an unidentified location
Possible reason(s):
LabVIEW:  (Hex 0x80004003) Invalid pointer.
=========================
NI System Configuration: A required pointer parameter was NULL.

I hope you can help me

Thanks!

[nyc_(is_out_of_here)]

Posting a JPG twice of the error isn't helpful.

The error is very clear. A required parameter is NULL.

I am not going to hunt down the documentation on this device.

If you want help you had better provide the necessary information.

[UrieelDM]

Ok, I attached a few commands of the device but it should work only with that last code, I think maybe... LabVIEW have no communication with the device yet.

Other problem I have is when I try to attach the ActiveX controls the following error appears:

But I have all my commands with property node and invoke node. I think i'm not doing all the steps ok for adding the .dll library or how can I define each variable of the library?

It doesnt have the .h (header file) for use the wizard witdg .dll

It suppose this options give me information about the device, and when I ask for one, I have the error of the NULL. I no understand what is missing.

Thanks!

[nyc_(is_out_of_here)]

If they have a VB.NET example that is the best thing to use to translate it into LabVIEW.

You can not on a whim use ActiveX Opens all over your LabVIEW code.

The code must be sequential.