Python語言開發采用東信QR-M20二維碼模塊，USB接口進行開發，調用了libdonseeQR.so 這個掃碼的接口庫。

import ctypes

from ctypes import *

import sys

# Define callback function types

tx_scanner_decode_data_cb_fun = CFUNCTYPE(c_int, c_ubyte, POINTER(c_ubyte), c_int)

tx_scanner_comm_state_cb_fun = CFUNCTYPE(None, c_ubyte)

# Load the DLL

tx_windows_hidpos = ctypes.CDLL("./tx_windows_hidpos.dll")

# Define function prototypes

tx_scanner_init = tx_windows_hidpos.tx_scanner_init

tx_scanner_init.restype = c_int

tx_scanner_get_version = tx_windows_hidpos.tx_scanner_get_version

tx_scanner_get_version.argtypes = [POINTER(c_ubyte), c_ubyte]

tx_scanner_get_version.restype = c_int

tx_scanner_decode_data_fun_register = tx_windows_hidpos.tx_scanner_decode_data_fun_register

tx_scanner_decode_data_fun_register.argtypes = [tx_scanner_decode_data_cb_fun]

tx_scanner_decode_data_fun_register.restype = c_int

tx_scanner_comm_state_fun_register = tx_windows_hidpos.tx_scanner_comm_state_fun_register

tx_scanner_comm_state_fun_register.argtypes = [tx_scanner_comm_state_cb_fun]

tx_scanner_comm_state_fun_register.restype = c_int

s_uiDecodeCnt = 0

@tx_scanner_decode_data_cb_fun

def tx_scanner_sdk_decode_data_cb(ucCodeType, pBuf, uiBufLen):

    global s_uiDecodeCnt

    return 0

@tx_scanner_comm_state_cb_fun

def tx_scanner_sdk_comm_state_cb_fun(ucState):

    print(f"scanner usb hidpos state:{ucState}")

def tx_scanner_sdk_show_menu():

    print("***************************東信QR-M20二維模組Test***************************")

    print("q:quit")

    print("******************************************************")

def main():

    ucVer = (c_ubyte * 128)()

    iRet = tx_scanner_get_version(ucVer, len(ucVer))

    if iRet > 0:

        strTemp = bytes(ucVer[:iRet]).decode('utf-8')

    print(f"DONSEE QR-M20 Linux python usb hidpos demo ver:{strTemp}")

    # Register decode data callback function

    tx_scanner_decode_data_fun_register(tx_scanner_sdk_decode_data_cb)

    # Register device connection state callback function

    tx_scanner_comm_state_fun_register(tx_scanner_sdk_comm_state_cb_fun)

    # Initialize

    iRet = tx_scanner_init()

    print(f"tx_scanner_init：{iRet}")

    print("q:quit")

    print("***********************東信QR-M20二維模組Test******************************")

    while True:

        cInput = input().lower()

        if cInput == 'q':

            print("quit")

            return

if __name__ == "__main__":

    main()