Communication between Matlab and National Instrument card

Hello,

I am trying make a communication between Matlab and my NI-USB6221 card.

Here is my Matlab code :

loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni')
taskh1=uint32(1);
[a,b,taskh1] = calllib('myni','DAQmxCreateTask','master',taskh1)

I precise that the files 'nicaiu.dll' and 'nidaqmx.h' are in the Matlab workspace (so I don't have to use addpath). And I don't have Data Acquisition Toolbox.

And this is what I get :

Warning: Warnings messages were produced while parsing.  Check the
functions you
intend to use for correctness.  Warning text can be viewed using:
[notfound,warnings]=loadlibrary(...) 
> In loadlibrary at 381
??? Error using ==> loadlibrary at 461
There was an error loading the library "C:\Documents and
Settings\uidt1982\Desktop\CARTE_NI\nicaiu.dll"
*La procédure spécifiée est introuvable.*

Caused by: Error using ==> loaddefinedlibrary La procédure spécifiée est introuvable.

For the ones who doesn't speak french at all, the sentence in bold means : "the specified procedure cannot be found"

I don't understand this error and I am really stuck...

Some help would be welcome.

Answer 1

[Kaustubha Govind]

Looks like your header (nidaqmx.h) may be declaring methods that LOADLIBRARY cannot find in the DLL? What do you get in 'warnings' if you try:

   >> [notfound,warnings]=loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni')

Answer 2

[nico974]

HI Kaustubha,

Thanks for your help.

You were right, it seems that my library file was not recognized by Matlab.

It works well now.

Kind regards.

[Sabria Lagoun]

How did you solve this?

Answer 3

[Clownfish]

Hi,

I have Matlab R2012a 32bit and a NI PCI-6229 card.

When I enter the command loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni') I get a hell of Warnings. Seems that Matlab cant load the library.

Any Hints?

Here are the Warnings:

> In loadlibrary at 344 
Warning: The data type 'error' used by function DAQmxGetTaskAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'FcnPtr' used by function DAQmxRegisterEveryNSamplesEvent does not exist. 
> In loadlibrary at 403 
Warning: The data type 'FcnPtr' used by function DAQmxRegisterDoneEvent does not exist. 
> In loadlibrary at 403 
Warning: The data type 'FcnPtr' used by function DAQmxRegisterSignalEvent does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetChanAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetChanAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetTimingAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetTimingAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetTimingAttributeEx does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetTimingAttributeEx does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetTrigAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetTrigAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetReadAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetReadAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetWriteAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetWriteAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetExportedSignalAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetExportedSignalAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetScaleAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetScaleAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetBufferAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetSwitchChanAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetSwitchDeviceAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetSwitchDeviceAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetSwitchScanAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetDeviceAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxCreateWatchdogTimerTask does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetWatchdogAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetWatchdogAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetCalInfoAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetCalInfoAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetPhysicalChanAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetRealTimeAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetRealTimeAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetPersistedTaskAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetPersistedChanAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetPersistedScaleAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetSystemInfoAttribute does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetDigitalPowerUpStates does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetDigitalPowerUpStates does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetDigitalPullUpPullDownStates does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetDigitalPullUpPullDownStates does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxSetAnalogPowerUpStates does not exist. 
> In loadlibrary at 403 
Warning: The data type 'error' used by function DAQmxGetAnalogPowerUpStates does not exist. 
> In loadlibrary at 403

[TAB]

Clownfish, please post this question in a new thread.

[Kaustubha Govind]

Yes, please do.