general pywinusb help

[kiyoshi7]

hey I'm trying to get pywinusb to work with a usb device that i've created and i'm having a hard time understanding some things. first off I saw an example using device.set_raw_data_handler(sample_handler) that, from what I understood, lets me send any type of data(int, char...) after finding sample_handler on the creator github and running the program. I tested it by writing a 'a' and I get an error telling me that it only accepts int is there a way to fix this? if not I can still just send int but i just think that char might help me out a bit.

Also I am trying to read data from the device, since I want to 'interact' to my usb device via python/terminal. but I can't figure out how to read data, as long as I can get the raw data that is being sent I can 'convert/process' it later on and since everything is going to be concurrent I don't think I'll have any problems especially since I don't need anything in real time.

here is my code, I know its a bit of a mess but I think its easy to understand what I'm trying to do

import pywinusb.hid as hid
##   usb device 
VId = 0x0001
PId = 0x0001

#def sample_handler(data):
 #   print("Raw data: {0}".format(data))




print('searching for device')

filter = hid.HidDeviceFilter(vendor_id = VId, product_id = PId)
hid_device = filter.get_devices()
device = hid_device[0]
device.open()
##   Setup communication     ##
 # datapipe allowing 64 byte data of any format #
target_usage = hid.get_full_usage_id(0x00, 0x40)
#device.set_raw_data_handler(sample_handler)
print(target_usage)
print('1')
report = device.find_output_reports()
print(report)
print(report[0])
print('2')
buffer = [0xFF]*65
buffer[0] = 65
print('3')
print(buffer)
print('4')
report[0].set_raw_data(buffer)
report[0].send()
print('5')

def writer(x):
    buffer[0]=x
    report[0].set_raw_data(buffer)
    report.send()

[micseydel]

Could you provide the full traceback saying that it only accepts ints?

[hashbrown190]

I'd also like to understand what set_raw_data_handler does. I thought it was used to read the data from a USB device. In the example folder of PyWinUSB, raw_data.py seems to use the function sample_handler() and set_raw_data_handler() function to pull data off the USB device. It works beautifully because I can see the raw data from my touch panel in the console. However, I want to put this data in a LIST (rather than printing it to the console), but I cannot figure out how to do it because these functions are passing functions which is very difficult for me to follow.
Any help is appreciated.