Hi Wafa,
I've tried to get the source code to the example, but since it is saved as an executable, I am unable to extract the source code. I am trying to contact the author of the example program in order to obtain the source code from him. I will post the source code if I am able to get it.
In the mean time, did the knowledge base document help you resolve the errors you were receiving in your data acquisition? If not, please let us know and we'll further assist you in troubleshooting the issue.
Best regards,
Marcus G.
Applications Engineer
National Instruments