issue with IVI-COM wrapper generated for DMM-4071 instrument driver

[Shivapriya]

Hi,

I have generated a IVI COM wrapper using NI Measurement Studio for the IVI C driver of DMM 4071 (nidmm_32.dll). Now I am trying to get the corresponding class driver for it. The code looks like:

using IVICOMWrapper; //IVI COM wrapper over the Dmm driver

using Ivi.Driver.Interop;

using Ivi.Dmm.Interop;

class Sample

{

   main()

  {

     IVICOMWrapper.nidmm = new nidmm("DmmLogicalName",true,true);

     IiviDmm classDriver = (IiviDmm) nidmm; //getting runtime error here that typecasting is invalid

  }

}

I am getting a runtime error that IVICOMWrapper.dmm cannot be converted to IiviDmm. Kindly help me out!!

I need to get the IVI class driver handle for Dmm

Thanks,

Priya.

[A_Ryan]

Shivapriya,

I have found a couple of documents that may help you address your current situation.  Microsoft Visual C# and Visual Basic .NET Wrappers for National Instruments Modular Instruments Driv... and Using IVI Specific Drivers in Visual Basic .NET, Visual C# or Visual Basic 6 Applications.

Also, can you please also include a screenshot of the error you are receiving?

[Shivapriya]

Hi Ryan,

Thanks for your reply. Actually its a .Net wrapper (C#) over the IVI-C driver.

I have attached the error file. I need to get handle to the IVI class driver from this wrapper.

Kindly help me out.

Thanks,

Priya.

[A_Ryan]

Priya,

The error that you are receiving sounds like it might be related typecasting error you posted in your original forum.  Typecasting errors are usually refer to an incorrect conversion of one data type to another.  Can you please check to ensure that the data types are correct in your class driver?  Are you passing the handle correctly from the wrapper to the class driver?

[Shivapriya]

Ryan,

I know that typecasting is not the right way to get class driver from the wrapper. You have any suggestions as to how i can do it?

I have tried using IVISessionFactory but it didn't work as it was not a IVI-COM specific driver.

I want the IVI class driver handler from the wrapper somehow...

Thanks,

Priya.