Libusb and Labview

[Anonymous]

Hi,

I have a usb device which I I want to control via labview. I have a
Windows dll that uses the libusb library. That dll contains a function
that returns a device handle of type usb_dev_handle.

It is defined a:
struct usb_dev_handle;

I then want to use this handle as a input for other functions but of
course labview doesn't know about the usb_dev_handle structure. Is
there a way around this.

Thanks

[Odd_Modem]

assign it to U32. see page 2-25 of the lvexcode.pdf manual.

[Kernel]

Hi.

I have tried the same thing with labview and libusb and had the same problem, you had.

Do you have an answer to that problem of communicating with an libusb-device by calling the library-function in labview?

if you have a working solution could you please help me and send it to me?

That would be very nice.

Thanks ang good by.

[Nadim R]

Hi,

A great lengthy document concerning calling external code in LabVIEW can be found here.  It states the calling convention of how to handle different datatypes.

I hope this helps,

Regards,

Nadim
Applications Engineering
National Instruments

[gcr3]

Nadim your link is broken

[Kyle97330]

It's here now:

https://www.ni.com/docs/en-US/bundle/370109b/resource/370109b.pdf

Also you're replying to a thread last posted to in 2007, it's not at all surprising.

[rolfk]

And the information about using an int32 for such a variable is wrong now. You should use a pointer sized integer to allow the program to work in LabVIEW 64-bit too.