我的代码从 Events 中的 print 语句中打印出我需要的内容。但是,由于类的实例化方式,我不知道如何返回数据。此外,打印语句仅在包含 pythoncom.PumpWaitingMessages() 时才有效,但它不会返回打印的数据或任何内容。
我希望能够使用打印的内容作为返回值,以供其他函数访问。
(如果情况变得更糟,我可以捕获标准输出(这是最后的手段)。)
代码:
# Standard Lib
import time
# Third Party
from win32com.client import DispatchWithEvents
import pythoncom
# Local Lib
import scan_var
class Events(object):
def OnBarcodeEvent(self, eventType=pythoncom.Empty, pscanData=pythoncom.Empty):
print pscanData
return pscanData
zebra = DispatchWithEvents("CoreScanner.CoreScanner", Events)
# open api
open_status = zebra.Open(0, [1], 1)
print "Open status: {}".format(open_status)
# get scanners
get_scanners = zebra.GetScanners(0, [1])
print "get_scanners: {}".format(get_scanners)
# Register for events
register = zebra.ExecCommand(1001,scan_var.register_for_events)
print "register: {}".format(register)
# PEWPEWPEW (pull trigger)
fire_result = zebra.ExecCommand(2011, scan_var.pull_trigger)
print "PEWPEWPEW {}".format(fire_result)
time.sleep(5)
while True:
time.sleep(1)
pythoncom.PumpWaitingMessages()
输出:
Open status: 0
get_scanners: (1, (1,),504</VID> <PID>6400</PID> ...
register: (u'', 0)
PEWPEWPEW (u'', 0)
<?xml version="1.0" encoding="UTF-8"?>
<outArgs>
<scannerID>1</scannerID>
<arg-xml>
<scandata>
<modelnumber>new_hotness </modelnumber>
<serialnumber>1522501a0501156 </serialnumber>
<GUID>2A4BE99CFCEFD047837ADF0082aD51AD5</GUID>
<datatype>27</datatype>
<datalabel>0x39 0x32 0x304 ...</datalabel>
<rawdata>0x22 0x03 0x00 ... </rawdata>
</scandata>
</arg-xml>
</outArgs>