load a task after main function return

[Rked]

Hello out there,

I'm heavily stuck to a difficult problem:

Currently I work on a project that is realized in Matlab. So I have Matlabcode that needs to access a NI acquisition card. This is done via MatlabExecutable (short: mex). This just creates a dll file from a cpp file:

Matlab code -> C file-> NI card.

The problem is that normally - in a single c file - you create a task, configure it, start acquisition, check for errors, exiting c code.

BUT, I have following situation:

Matlab -> create_task (configure, etc) -> NI

Matlab -> start_acquisition -> NI

Matlab -> cleanup -> NI

So I need to get the taskHandle from each step. And here I'm stucked. It doesnt work.

Matlab -> create task -> NI: everthing is fine I got all parameters created and I receive the task Handle back to Matlab

Matlab -> start_acq -> NI: I hand over the task Handle but the function DAQmxLoadTask(handle) doesnt work.

Besides my implementation, would it work?? Will the task still be in the system if the c file runs through without cleaning/destoying the task?

And could the DAQmxLoadTask function retrieve it?

Regards

Rked

[Stephan_D]

Hi Rked,

i don't use Matlab for DAQ-Applications, but maybe there is another solution. National instruments provides a so called NI-DAQmx Tool which seems to be the better way to use Hardware from National Instruments with Matlab

An Introduction to NI-DAQmx Tools for Data Acquisition with The Mathworks, Inc. MATLAB® Software - Developer Zone - National Instruments
http://zone.ni.com/devzone/cda/tut/p/id/3005

Regards,

Stephan