Runtime error example NOR-DAQmx ANSI C in the Windows 7 virtual machine

I am under a guest Windows 7 system with a host of Ubuntu 14, using VirtualBox and have encountered a problem running even the simplest examples provided by National Instruments, using the ANSI C API for NOR-DAQmx.

The first time that the DAQ hardware is turned on, I can run a single measure, and after that, any other indicator displays the following error message:

Attempted to read samples that are no longer available.
The requested sample was previously available, but has since been overwritten.
Increasing the buffer size, reading the data more frequently, or specifying
a fixed number of samples to read instead of reading all available samples
might correct the problem.

Property: DAQmx_Read_RelativeTo
Corresponding Value: DAQmx_Val_CurrReadPos
Property: DAQmx_Read_Offset
Corresponding Value: 0

Task Name: _unamedTask(0)
Status Code: -200279

In order to start a new measurement, I have to restart the DAQ hardware, probably in order to clear the internal buffers that are in the process of substitution.

I am interested in a measure of continuous tension in basic by using a callback function. (The example of ContAcq_IntClk provided by OR)

The exactly the same setup, same version of NOR-DAQmx (9.7.5) and running on Visual Studio 2012 smoothly on a computer that is running Windows 7 directly.

I suspect that the problem is with the internal buffer being somehow messed up because of the connection with the Virtual Machine, but do not find an elegant solution to fix it.

The camera I use is NI USB-6289.

Hello fromm8

Thank you very much for your help, I managed to locate the problem.

He was not the actual code, or something like that, it was a problem of communication between the VirtualBox machine and the physical device.

Kept launches MAX test panels a comparable as error the program C.

I fixed the problem by opting for VMWare, which seems to have the best compatibility with USB devices.

See you soon!

Tags: NI Software

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