Problem on GetHidGUID... (Unsolved)

Hello! I made a simple VI as in attached photo.

When I did this the first time that I ran it, it took less than a second and then gave a number, I guess it's a GUID, then the end of the program. Then I clicked on run again, it took long enough, a few seconds and that the program is declining! My questions are...

1. why would it be down in a second round?

2. I displays the GUID in the indicator number, but is not large enough to store the GUID as a whole? If not big enough, what should I use?

Raymond

vgbraymond wrote:

I was really confused.

First of all... A guid must be 16 bytes, but I can store up to 8 bytes (64 bits) in a single element, so my GUID here should be incomplete... How should I handle this?

Second... I had two elements at the first time, and then I tried to unplug my mouse (I use a laptop, so I have my mousepad) run this program again, I have always two elements in the picture... Why would this happen?

Raymond

First of all, you allocate an array of 16 int32, not 16 int8 (bytes), and then you pass it to the node library called a parameter whose type long table. long time however is 64-bit LabVIEW transforms your 16 16 int64 int32 to pass to the function. This function fills 16 bytes and returns. I hope you can see why you get what you get.

Second, the returned GUID is simply a GUID that you can use to enumerate HID devices in your system. It is NOT the enumeration of the camera itself. For this, you need to do a lot more work in terms of call Windows APIs more many of which some, like SetupDiGetClassDevs(), SetupDiEnumDeviceInterfaces(), SetupDiDestroyDeviceInfoList() and HID_FindDevice().

Tags: NI Software

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