[英]Reading TDMS files in python_ how to use tdmsinfo command?
I would like to know what is the content of a tdms file, which is produced by Labview. 我想知道Labview产生的tdms文件的内容是什么。
Following this site , I write in Python: 在这个站点之后 ,我用Python编写:
import numpy as np
from nptdms import TdmsFile
from nptdms import tdms
#read a tdms file
filenameS = "RESULTS.tdms"
tdms_file = TdmsFile(filenameS)
tdmsinfo [--properties] tdms_file
I receive the following error: 我收到以下错误:
tdmsinfo [--properties] tdms_file
^
SyntaxError: invalid syntax
I do not how to fix it. 我不怎么解决它。
Thank you for your help :) 谢谢您的帮助 :)
What you are looking for is: 您正在寻找的是:
First create a TMDS objet from file: 首先从文件创建TMDS对象:
tdms_file = TdmsFile("C:\\Users\\XXXX\\Desktop\\xx Python\\XXXX.tdms")
then get the group names with: 然后使用以下命令获取组名:
tdms_groups = tdms_file.groups()
after you can figure out which group names you have into the file, just write 在找出文件中包含哪些组名后,只需编写
tdms_groups
It will print the following: 它将打印以下内容:
['Variables_1', 'Variables_2', 'Variables_3', 'Variables_4', etc..] ['Variables_1','Variables_2','Variables_3','Variables_4'等。]
With group names now u will be able to get channels with the following: 现在有了组名,您将能够获得具有以下内容的频道:
tdms_Variables_1 = tdms_file.group_channels("Variables_1")
Next print your channels contain into that group: 接下来将您的频道包含在该组中:
tdms_Variables_1
It will show: 它会显示:
[ TdmsObject with path /'Variables_1'/'Channel_1', TdmsObject with path /'Variables_1'/'Channel_2', etc..] [具有路径/'Variables_1'/'Channel_1'的TdmsObject,具有路径/'Variables_1'/'Channel_2'的TdmsObject,等等。]
At the end get the vectors and its data: 最后获得向量及其数据:
MessageData_channel_1 = tdms_file.object('Variables_1', 'Channel_1')
MessageData_data_1 = MessageData_channel_1.data
Check your data 检查你的数据
MessageData_data_1
do stuff with your data! 用您的数据做事! cheers!
干杯!
To loop over all properties from the root object try this: 要遍历根对象的所有属性,请尝试以下操作:
#read a tdms file
filenameS = "RESULTS.tdms"
tdms_file = TdmsFile(filenameS)
root_object = tdms_file.object()
# Iterate over all items in the properties dictionary and print them
for name, value in root_object.properties.items():
print("{0}: {1}".format(name, value))
That should give you all properties names. 那应该给您所有属性名称。
Your problem seems to be that tdmsinfo will not work inside a Python script as it is not a python command: it's "a command line program" . 您的问题似乎是tdmsinfo无法在Python脚本内运行,因为它不是python命令:它是“命令行程序” 。
The solution is to either use 'tdmsinfo' from a windows shell, or make a wrapper in python so that it runs the command in a subprocess for you. 解决方案是使用Windows外壳程序中的“ tdmsinfo”,或在python中进行包装,以便它在您的子进程中运行命令。 For instance in Python3 with the subprocess package
例如在带有子流程包的Python3中
import subprocess
tdmsfile='my_file.tdms'
# startup info to hide the windows shell
si = subprocess.STARTUPINFO()
si.dwFlags |= subprocess.STARTF_USESHOWWINDOW
#si.wShowWindow = subprocess.SW_HIDE # default
# run tdmsinfo in a subprocess and capture the output in a
a = subprocess.run(['tdmsinfo',tdmsfile],
stdout=subprocess.PIPE,
startupinfo=si).stdout
a = a.decode('utf-8')
print(a)
the code above should give you only the channels and groups, but you can also run with the -p flag to include all the TDMS object properties 上面的代码应该只为您提供通道和组,但是您也可以使用-p标志运行以包含所有TDMS对象属性
a = subprocess.run(['tdmsinfo','-p',tdmsfile],
stdout=subprocess.PIPE,
startupinfo=si).stdout
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