loadlibrary works on 32 bit but not 64 bit MATLAB

I am trying to load a set of dlls from National Instruments in MATLAB so that I can interface with the National Instruments DAQ card through MATLAB. This has worked in the past using 32 bit MATLAB (on a 64 bit machine) however it is not working on 64 bit MATLAB. How can I fix this?

I am running the following command: funclist = loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni');

and get the following error:

"Error using loadlibrary There was an error loading the library "C:\Users\ecating\Documents\MATLAB\Version_1\V1_scripts_DoNotDelete\NI_DAQ_scriptsAndInfo\nicaiu.dll" C:\Users\ecating\Documents\MATLAB\Version_1\V1_scripts_DoNotDelete\NI_DAQ_scriptsAndInfo\nicaiu.dll is not a valid Win32 application.

Error in c_PCIE6321 (line 55) funclist = loadlibrary('nicaiu.dll','nidaqmx.h','alias','myni');

Caused by: Error using loaddefinedlibrary C:\Users\ecating\Documents\MATLAB\Version_1\V1_scripts_DoNotDelete\NI_DAQ_scriptsAndInfo\nicaiu.dll is not a valid Win32 application."

I am running MATLAB 2016b (version 9.1) on Windows 10.

Answer 1

[Varun Gunda]

The "is not a valid Win32 application" error usually means that you are attempting to load a 32-bit DLL using 64-bit MATLAB. Check if there are 64-bit versions of the NI DLLs available and download them. Or You can try installing 32-bit MATLAB on your 64-bit machine and use them as you were doing previously.

[Walter Roberson]

Note that R2015b was the last 32 bit version