Problems changing state in DAQmxTaskControl

[DanielBryars]

I've created a DOChan within a task programatically using DAQmx functions exported from nicaiu.dll and DAQmxTaskControl always fails with the error "Action Request is Invalid."

Please can anyone tell me how do you sucessfully validate a task?

It fails with the same error when trying to change to any other state, eg commit reserve etc.

Note, the task runs okay and I get the correct output if I omit the explicit change of state.

[nd]

Daniel,
You should be able to call DAQmxTaskControl(DAQmx_Val_Task_Verify) to verify your task.
If thats what you are doing, and it isn't working could you please post a small snippet that reproduces the problem ?
Thanks!

[DanielBryars]

Nandan,

Again thanks for your help. DAQmxTaskControl works fine in C / C++, and I don't have time to fully investigate what I was doing wrong from VBA. When I get a chance I'll investigate further, and for your interest post a reply.

Everything is working well now - I'm pleased with the NI stuff, thanks!

Daniel