Hi,

I contact you because I'm trying since 3 week to do a communication between an electronic board and a Lazarus application with the libusb library ( libusb.sourceforge.net).
After many reserach on the web and lot of manipulations I can't do it .

I want to do a multiplatform application (MAC OS, Windows and Linux) but MAC OS and windows in priority.

I thanks in advance and don't hesitate to contact me for questions if you need details.

Good day

2009/4/7 S?bastien FLOURETTE :

you'll first have to tell us what the problem/error is before we can help. what are you trying to do? if you can link to libusb and call the functions, then you should rather post to the libusb mailing list, since they can help you with usb specific stuff. i have used libusb before from fpc (under linux) and it works as expected.

I want to do a multiplatform application (MAC OS, Windows and Linux) but MAC OS and windows in priority.

there are subtle differences in the way libusb and libusb-win32 works, since they are not the same project, so be warned.

henry

make sure you have sufficient rights to access the usb device (run your program as root to test). i have no idea how to give this access on the mac, but you use udev for this on linux.

i see in your sources that you don't try and open the device or claim an interface. try and do this before you check vid/pid: like so:

while bus  nil do begin
    dev := bus^.devices;
    while dev  nil do begin
          usb_device := usb_open(dev);
          if (usb_device  nil) and ((dev^.descriptor.idVendor =
$1234) and (dev^.descriptor.idProduct = $4568)) then ...

i'm not sure if it will solve your problem, though.

if this doesn't help, try the testlibusb.c program in the usb sources and see if that works.

henry

2009/4/8 Henry Vermaak :

2009/4/8 S?bastien FLOURETTE