Non-functional VIs after Shared Library Import

vrpederson · Post by **vrpederson** » Mon Apr 13, 2009 8:48 pm

After downloading the ps3000sdk_r6_2_2_12.zip file and using LabVIEWs Import Shared Library (.dll) function I end up with two VIs that are "broken", I've attached the VIs in the zip file.

LabVIEW gave me the following error report when the import finished:

Import Shared Library Report

Monday, April 13, 2009 10:40:23 AM

Your generated files are installed in the following folder:
C:\Program Files\National Instruments\LabVIEW 8.5\user.lib\ps3000

Parsing header file warnings:
No errors/warnings occurred when parsing the header file.

The following errors/warnings occurred when generating the wrapper VIs for this shared library.

VI Not Executable
The VI is not executable because of one of the following reasons:
1. The shared library or a dependent file is not installed. To make the VI executable, you must install the shared library and all support files on the computer on which you run the VI.
2. A required custom control might be empty or cannot be found. To make the VI executable, update the custom control manually.
3. The VI contains a parameter with an unsupported data type. To make the VI executable, you must replace the empty cluster that the wizard generates with a control or indicator that uses supported data types.
get streaming last values.vi
save streaming data.vi

What exactly do I need to do to fix these non-functioning VIs?

Thanks

Robin · Post by **Robin** » Tue Apr 14, 2009 8:47 am

Hi

Can you save them for Labview 8.2? I will have a look.

Robin

vrpederson · Post by **vrpederson** » Tue Apr 14, 2009 3:56 pm

Robin,
Thanks for the quick response. Here is a zip of the LabVIEW library with the VIs converted to LabVIEW 8.2. I couldn't include all of the LabVIEW VIs created because of the attachment size limitation.

Thanks,
Verne

Robin · Post by **Robin** » Wed Apr 15, 2009 8:13 am

Hi

The function ps3000_get_streaming_last_values requires a pointer to a callback function. The passing of function pointers is not supported by LabVIEW. If you look at our examples, you can see that we have used a wrapper DLL (ps3000wrap.dll) to solve this problem.

If you still get errors, I would check the data types selected in the Call Library Function Nodes against the 3000 User's Guide.

Also, you should select "stdcall" under calling convention.

Hope this helps

Robin

vrpederson · Post by **vrpederson** » Wed Apr 15, 2009 8:26 pm

Hello Robin,

The 3000 series user guide included in the ps3000sdk_r6_2_2_12.zip file doesn't mention the use of the ps3000wrap.dll. The only place I've been able to find a mention of the ps3000wrap.dll is in the 3425 user guide. Also the examples included in the ps3000sdk don't match what the documentation lists as the included examples.

I'll take a closer look at the included examples.

Thanks for your help.