Instrument Control (GPIB, Serial, VISA, IVI)

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Problems to load HIDAPI.DLL using external code (HID USB)

Hello, during the last months I have worked with interface USB in Bulk mode using NI VISA RAW to control my devices, so I tried to use HID interface for a specific proyect. I found that is some complicated implement it. Searching the internet I found a library which can be used with Windows, Mac and Linux. This library is specified in http://www.signal11.us/oss/hidapi/ and http://www.signal11.us/oss/hidapi/hidapi/doxygen/html/group__API.html

In windows it is necesary a .dll file. I want to use it with LabVIEW using "Call Library Functions Node". I have had some problems to implement it, principally because in some functions of this library,  the input and output parameter is a structure. Also, in this structure there are variables such as "wchar_t" which I don't know what is the equivalence in labview. I would like to know if you can help me.

Best Regards

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Hi Diegin,

 

In order to use Call Function Library node, you should know the DLL structure. Please refer to this link to configure that node:

https://decibel.ni.com/content/docs/DOC-9069

 

Best,

 

CarmenC.

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