Why are the Labwindows Instrument functions different to the Logitech SDK methods for their webcam?

[Ed Roberts]

Following my last question, and answer from Jeremiah (3/2/01), I used the "Create ActiveX Automation Controller" to generate an "Instrument" from the Logitech DLL in their SDK. However, the resultant functions are different to the methods and properties detailed in the Logitech SDK documentation, and there appears to be no corresponding documentation or help within Labwindows. Within a function window of the instrument library, right-clicking on the function only gives a prototype with no additional text, while the class and instrument help only respond with "Interface" and "Library" respectively.

[Jeremiah Cox]

Hello Ed,
LabWindows/CVI does not ship with documentation for third-party products. The CVI "Create ActiveX Automation Controller" Tool simply generates an Instrument Driver that wraps the properties and methods exported in the type library with easier to use C functions. Some type libraries contain links to their help files (Microsoft Office products for example). When they do, we attempt to load them when a user right-clicks on a function panel. I would recommend that you take a look at our ActiveX examples located at \samples\activex for help in understanding how ActiveX Instrument Drivers work in CVI.

Jeremiah Cox
Applications Engineer
National Instruments
http://www.ni.com/ask