DAQMXcreatetask returns -1

[daq1234]

Hi,

I am using NI USB 6211 DAQ. I am using cent OS (Linux r45-lin 2.6.18-308.8.2.el5 #1 SMP Tue Jun 12 09:58:12 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux).

I have downloaded and installed the nidaqmxbase-3.5.0.iso base driver on my cent os linux distribution. When I am creating the DAQ task with  DAQmxBaseCreateTask e.g.

if (DAQmxFailed(r = DAQmxBaseCreateTask("task1", &m_tH)))

This DAQmxBaseCreateTask returns -1 lot of times. What does this error code represent. I could not find this error in reported NI errors list.

Regards,

Dinky

[grdetil]

I believe that the support for 64-bit (x86_64) builds of RHEL (and clones) in the nidaqmxbase version 3.5.0 and 3.6.0 packages only covers the driver support for 64-bit kernels.  For program development, the packages still only include 32-bit libraries, so you need to compile into 32-bit code on 64-bit systems (using the -m32 option).  See

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Developer_Guide/compi...

for details, and scroll down to the section "4.1.6.6. Using 32-bit compilers on a 64-bit host".  These notes are for RHEL6.  For RHEL5 and clones, you'll need to install the i386 builds of the libraries, rather than i686 builds, to get 32-bit library support for development.