I've seen a couple questions similar to this, but they both appear to involve VBA and not Python.
This is a relatively recent error, so I suspect it might have something to do with the fact that I'm using Python 3.7 now.
Basically, using the Dispatch method from win32com.client, I am able to open a new Excel workbook and make my edits as I always have been. However, for some reason, I am unable to tell the application to quit successfully.
Used to be that I could write:
self.excel_app.Quit()
But now, I'm getting an AttributeError, of all things. Saying the Excel.Application does not have a Quit() attribute. Again, this is Python 3.7. What happened?
[EDIT]
Relevant code:
import sys
from win32com.client import Dispatch
#...
class X(object):
def __init__(self):
#...
self.excel_app = Dispatch("Excel.Application")
self.report_workbook = self.excel_app.Workbooks.Add()
#...
def close_excel(self):
try:
self.excel_app.Quit()
except Exception as ex:
sys.stdout.write("Could not quit application.\n-> ({}) {}\n".format(ex.__class__.__name__, ex))
self.excel_app = None
The exception printed to the terminal is:
Could not quit application.
(AttributeError) Excel.Application.Quit
Turns out that my error was coming from the fact that I was still using threading.Thread as the base class for the object trying to do this. Apparently it doesn't work so well with the Dispatch Excel objects anymore, and I'm trying to move away from Threads anyway.
Related
I've searched on this forum for a possible workaround, and tried my best, but none is working. below is the issue. I've a function which process websocket data and dump into an excel
I tried to use a wrapper/loop around the function, but still its failing.
I am utilizing, xlwings to copy data to the excel as below
def websocket_data_process():
xw.Book(xcelfile).sheets[shets1].range('A40').options(index=False).value = futDf
----where futDf is pandas datafrme
The issue is whenever, I am editing the excel at 'A40' Range manually (while the funcion is running), I am getting error like process ended with exit 3221225477. (I googled and came to its a access denied issue). Is there any way that I can workaround this crash and again resume the function, once editing is down..
Not sure if this is what you want. You can ask for a pause. The solution below will only work with windows.
import os
os.system("pause")
or this will work with any system.
input('Press <ENTER> to continue')
Of course you need an statement such as
for i in range(50):
rng = f'A{i+1}'
if rng == 'A40':
input('Press <ENTER> to continue')
# Do your things here ...
thanks for the response, but I resolved it,
The issue happens because the xlwings trying to access the existing excel which is either locked or not available to access it.
solution: I've created an instance of Excel with xlwings context manager and provided full permissions to the account which is running the excel and it's been resolved.
I am connected to an Excel application and can execute the "Debug"->"Compile VBAProject" from my Python code using win32com like so (inspired by code from here):
from win32com import client
def compile(self):
self.__excel = client.GetActiveObject("Excel.Application")
compile_button = self.__excel.VBE.CommandBars.FindControl(1, 578)
compile_button.Execute()
If there is a compilation error in the Excel VBA code I get a popup message in Excel telling me the error just fine.
Now I would like to check from the Python code if there was a compilation error and raise an exception if there was. I don't necessarily need the compilation error to be part of the exception but if that were possible I would of course gladly take that, too.
Can this be done somehow?
I've been experimenting with all kinds of window counts before and after the compilation etc. but so far have not found a property of any object that would indicate that there was a popup or a compilation error.
Ok, I found a somewhat ugly but doable way - that I would like to document for others having the same issue:
You need to import a code file into the opened Excel file that has (at least) one function defined. Then you can call this function from your Python code and catch any exception. If there was an exception your code - including the imported file - did not compile, if there is none the compilation was pass.
Here's my code:
compile_code.bas
Public Sub compileCode()
' doesn't need to do anything, it just needs to be available!
End Sub
Python file
from win32com import client
def compile(self) -> bool:
self.__excel = client.GetActiveObject("Excel.Application")
self.__book = self.__excel.ActiveWorkbook
self.__book.VBProject.VBComponents.Import(<Path_to_compile_code.bas>)
try:
self.__excel.Application.Run("compileCode")
# if you reach here the code compiled
return True
except Exception:
return False
So I have this GUI that I made with tkinter and everything works well. What it does is connects to servers and sends commands for both Linux or Windows. I went ahead and used pyinstaller to create a windowed GUI without console and when I try to uses a specific function for sending Windows commands it will fail. If I create the GUI with a console that pops up before the GUI, it works like a charm. What I'm trying to figure out is how to get my GUI to work with the console being invisible to the user.
The part of my code that has the issue revolves around subprocess. To spare you all from the 400+ lines of code I wrote, I'm providing the specific code that has issues. Here is the snippet:
def rcmd_in(server):
import subprocess as sp
for i in command_list:
result = sp.run(['C:/"Path to executable"/rcmd.exe', '\\\\' + server, i],
universal_newlines=True, stdout=sp.PIPE, stderr=sp.STDOUT)
print(result.stdout)
The argument 'server' is passed from another function that calls to 'rcmd_in' and 'command_list' is a mutable list created in the root of the code, accessible for all functions.
Now, I have done my due diligence. I scoured multiple searches and came up with an edit to my code that makes an attempt to run my code with that console invisible, found using info from this link: recipe-subprocess. Here is what the edit looks like:
def rcmd_in(server):
import subprocess as sp
import os, os.path
si = sp.STARTUPINFO()
si.dwFlags |= sp.STARTF_USESHOWWINDOW
for i in command_list:
result = sp.run(['C:/"Path to executable"/rcmd.exe', '\\\\' + server, i],
universal_newlines=True, stdin=sp.PIPE, stdout=sp.PIPE,
stderr=sp.STDOUT, startupinfo=si, env=os.environ)
print(result.stdout)
The the problem I have now is when it runs an error of "Error:8 - Internal error -109" pops up. Let me add I tried using functions 'call()', 'Popen()', and others but only 'run()' seems to work.
I've reached a point where my brain hurts and I can use some help. Any suggestions? As always I am forever great full for anyone's help. Thanks in advance!
I figured it out and it only took me 5 days! :D
Looks like the reason the function would fail falls on how Windows handles stdin. I found a post that helped me edit my code to work with pyinstaller -w (--noconsole). Here is the updated code:
def rcmd_in(server):
import subprocess as sp
si = sp.STARTUPINFO()
si.dwFlags |= sp.STARTF_USESHOWWINDOW
for i in command_list:
result = sp.Popen(['C:/"Path to executable"/rcmd.exe', '\\\\' + server, i],
universal_newlines=True, stdin=sp.PIPE, stdout=sp.PIPE,
stderr=sp.PIPE, startupinfo=si)
print(result.stdout.read())
Note the change of functions 'run()' to 'Popen()'. The 'run()' function will not work with the print statement at the end. Also, for those of you who are curious the 'si' variable I created is preventing 'subprocess' from opening a console when being ran while using a GUI. I hope this will become useful to someone struggling with this. Cheers
I don't understand why I get this threading error by just using the threading module. It works fine without the threading module.
I searched on internet, but I don't get the appropriate answer.
Add the following line before the try statement:
connSkt = None
Also modify the close part:
if connSkt is not None:
connSkt.close()
The code
import win32com.client as win32
Excel = win32.gencache.EnsureDispatch('Excel.Application')
used to work, but now it produces the error:
AttributeError: 'module' object has no attribute 'CLSIDToPackageMap'
what's going on?
After deleting C:\Temp\gen_py, the code above works again. Hope it can save trouble!
The main reason for this attribute error is because your COM-server has shifted from late-binding (dynamic) to early binding (static).
In Late Binding, whenever a method is called, the object is queried for the method and if it succeeds, then the call can be made.
In Early Binding, the information of the object model is determined in advance from type information supplied by the object call. Early binding makes use of MakePy. Also, early binding is case sensitive.
There are two ways to fix this issue:
Use the dynamic module to force your code to work in a late-bound oriented way. Example use:
"win32com.client.Dispatch()" instead of "win32.gencache.EnsureDispatch('Excel.Application')"
Use camelcase sensitive keywords for the early bound oriented way. Example use:
"excel.Visible()" instead of "excel.VISIBLE()" or "excel.visible()"
I guess, the code works for the first run after deleting gen_py folder but from the second run throws an error as win32.gencache.EnsureDispatch being an early binding Dispatch, gen_py folder will be created again.
I found a more elegant solution on a Github discussion and incorporated it into a function. Worked for me.
def dispatch(app_name:str):
try:
from win32com import client
app = client.gencache.EnsureDispatch(app_name)
except AttributeError:
# Corner case dependencies.
import os
import re
import sys
import shutil
# Remove cache and try again.
MODULE_LIST = [m.__name__ for m in sys.modules.values()]
for module in MODULE_LIST:
if re.match(r'win32com\.gen_py\..+', module):
del sys.modules[module]
shutil.rmtree(os.path.join(os.environ.get('LOCALAPPDATA'), 'Temp', 'gen_py'))
from win32com import client
app = client.gencache.EnsureDispatch(app_name)
return app
Thanks - worked like a charm after adding your function and making this change:
#excel = win32.gencache.EnsureDispatch('Excel.Application')
excel = dispatch('Excel.Application')
Sincerely,
js