How to use DAQmxGetDevProductNum and DAQmxGetDevProductCategory?

[David_Lin]

Hi,

I added this two functions in my C++ code as

 uInt32 ProductNum,ProductCat;
 DAQmxGetDevProductNum("Dev1",&ProductNum);
 DAQmxGetDevProductCategory("Dev1",&ProductCat);

but there are errors from the compiler that

error C3861: 'DAQmxGetDevProductNum': identifier not found

error C3861: 'DAQmxGetDevProductCategory': identifier not found

Do I need to include any header file for these two functions other than NIDAQmx.h? Is there another way to realize these two functions in DAQmx v8.1?

Thank you very much!

David

[kalyanramuv]

Hi David,

You have to include NiDAQmx.lib in C++ environment. For complete list of settings, please refer to this knowledge base:

http://digital.ni.com/public.nsf/websearch/0087C1E20920F7B986256D9B0061DEE2?OpenDocument

Please let me know if this helps.

Thanks,

Kalyan

[David_Lin]

Hi, Kalyan,

I have already included both NiDAQmx.lib  and NiDAQmx.h in my project by right-clicking on the source files, and selecting Add» Add Existing Item. The problem still exists. Is it the correct way to add the library files?

Thanks.

David 

[kalyanramuv]

Hi David,

Can you please post your project with simple code demonstrating the problem. It will be helpful to debug the issue using the sample project.

Thanks,

Kalyan

[David_Lin]

Hi, Kalyan,

I attached a sample project for you. In the CheckNIcard function in DAQmx.cpp, I tried to use DAQmxGetDevProductNum and DAQmxGetDevProductCategory, but the compile error appeared. Please help me check what's wrong.

Thank you very much!

David

[kalyanramuv]

Hi David,

These are the steps I would follow to fix your code:

Click the Directories tab. Make sure you are viewing the directories for include files, and add the following new path: C:\Program Files\National Instruments\NI-DAQ\DAQmx ANSI C Dev\include.

Add a link for library files with the following path: C:\Program Files\National Instruments\NI-DAQ\DAQmx ANSI C Dev\lib\msvc.

After you add NIDAQmx.lib and NIDAQmx.h, the code should compile without problems.

Thanks,

[kalyanramuv]

Hi David,

Forgot to mention that attached zip file has example code which I created to show you as how to get the list of devices in a computer using VC++ and DAQmx.

Thanks,

Kalyan

[David_Lin]

Hi, Kalyan,

Thanks for your code. I still have some questions.

1) the functions DAQmxGetSystemInfoAttribute and DAQmxGetDeviceAttribute could not be found in the NI-DAQmx C Reference Help. Can you tell me where they are introduced?

2) I did as what you told me to select Tools -> Options, select Projects->VC++ Directories, add the path: C:\Program Files\National Instruments\NI-DAQ\DAQmx ANSI C Dev\include, and C:\Program Files\National Instruments\NI-DAQ\DAQmx ANSI C Dev\lib\msvc. But there are still the same compile errors.

Any suggestion?

David

[David_Lin]

Hi, Kalyan,

In some posts it was said that DAQmxGetSystemInfoAttribute and DAQmxGetDeviceAttribute is for CVI only. And in DAQmx C, I have to use DAQmxGetDevProductType and DAQmxGetDevSerialNum. If it is true, would you please provide any code with DAQmx C, not CVI, to enumerating devices?

Thank you very much!

David

[kalyanramuv]

Hi David,

Sorry for the confusion. What I was referring to is:

Add the following files to your project;

1) C:\Program Files\National Instruments\NI-DAQ\DAQmx ANSI C Dev\lib\msvc\NIDAQmx.lib 

2) C:\Program Files\National Instruments\NI-DAQ\DAQmx ANSI C Dev\include\NIDAQmx.h

If you don't add the library file, you will get the linking errors. Please refer to the sample project I posted as how the following files have been added to project.

In the code I have posted for VC++, I used DAQmxGetSystemInfoAttribute for getting the list of devices. Then I poupulated the properties of each device using DAQmxGetDevProductType and DAQmxGetDevSerialNum.

The code I posted should answer most of the questions.

Thanks,

Kalyan