Trouble creating Variant format for ActiveX Function (MintMT Controller)

[Mr._NiceGuy]

Hello!

I am creating a VI to control 2-axis motion using the MintMT activeX library and have run into a problem.  I was able to easily call and execute functions from Labview until I ran into one (VectorA) that requires an array of variant input.  I cannot format my input correctly and have exhausted myself trying different combinations of building this array and converting to variant type (To Variant). I also have wired Labview arrays directly (with no luck). The arrays are very small (only 2 elements). Finally I tried the OpenG library (Cluster to Varray and Array to Array of Vdata) without success.  The error code is: LabVIEW:  (Hex 0x80070057) One or more arguments are invalid.

Any advice?

Attached is the documentation for the function:

VectorA

Prototype:

VB      VectorA(nNumberOfAxes As Integer, nAxesArray As Variant,
                fPosArray As Variant)

Delphi  VectorA : (nNumberOfAxes: Smallint; nAxesArray: OleVariant;
                   fPosArray: OleVariant)

C++     void VectorA(short nNumberOfAxes, VARIANT nAxesArray, VARIANT fPosArray);

C       void VectorA(__int16 nNumberOfAxes, __int16 *nAxesArray, float *fPosArray);

[Hillary_C_E]

Hi Mr. NiceGuy,

Can you post the section of the vi that has this problem? Have you tried creating a constant input to verify what the input is expecting?

[Mr._NiceGuy]

Hello Hillary_C_E,

Thank you for your prompt response. Unfortunately I was struck with the flu this past week so please excuse my delay in response. Attached is a section of the VI using the problem function. I've shown it with arrays wired directly, however, I get the same error regardless of array, cluster, or constant input

in native or variant format. In the example below I've requested a vector movement on 2 axes, (0,1) to an absolute position of (5,5).

[Mr._NiceGuy]

Hi Again,

I've been in touch with the manufacturer and they kindly provided a sample code.  This is the correct input format to run the function. Thank you for your assistance.

Mr.NiceGuy

[Hillary_C_E]

Hi Mr. NiceGuy,

The code from the manufacturer has a To Variant converter between the arrays and the Property Node. I'd recommend converting the arrays to variants in your code. You can find that To Variant VI on the Functions Palette » Programming » Cluster, Class, & Variant »Variant. Let us know if that works.

Hillary