REDI API L1 Stream

beratp1 · January 2023

Hello Community,

This question is related to REDI API Python application on Windows using win32com.

I've been trying to stream L1 pricing data for a single instrument but keep getting the following error message. Would appreciate any guidance you may be able to offer. Thank you, Berat Pehlivanoglu.

(mach) PS C:\code\redi> & C:/Users/BeratPehlivanoglu/anaconda3/envs/mach/python.exe "c:/code/redi/Market Data Subscriber.py"

Traceback (most recent call last):

  File "C:\Users\BeratPehlivanoglu\anaconda3\envs\mach\lib\site-packages\win32com\client\dynamic.py", line 86, in _GetGoodDispatch

    IDispatch = pythoncom.connect(IDispatch)

pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)



During handling of the above exception, another exception occurred:



Traceback (most recent call last):

  File "c:\code\redi\Market Data Subscriber.py", line 37, in <module>

    q = win32com.client.Dispatch("REDI.CacheControl")

  File "C:\Users\BeratPehlivanoglu\anaconda3\envs\mach\lib\site-packages\win32com\client\__init__.py", line 117, in Dispatch

    dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch, userName, clsctx)

  File "C:\Users\BeratPehlivanoglu\anaconda3\envs\mach\lib\site-packages\win32com\client\dynamic.py", line 106, in _GetGoodDispatchAndUserName

    return (_GetGoodDispatch(IDispatch, clsctx), userName)

  File "C:\Users\BeratPehlivanoglu\anaconda3\envs\mach\lib\site-packages\win32com\client\dynamic.py", line 88, in _GetGoodDispatch

    IDispatch = pythoncom.CoCreateInstance(

pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)

I have no issues when requesting L1 data;

(mach) PS C:\code\redi> & C:/Users/BeratPehlivanoglu/anaconda3/envs/mach/python.exe c:/code/redi/l1.py
2023-01-31 11:36:56 Symbol=135.30 Last=IBM success=True
2023-01-31 11:36:56 Symbol=20.07 Ask=T success=True
2023-01-31 11:36:56 Symbol=207.20 Bid=BA success=True
2023-01-31 11:36:56 Symbol=207.20 InvalidSymbol=InvalidSymbol success=False
(mach) PS C:\code\redi>

or when sending an order;

(mach) PS C:\code\redi> & C:/Users/BeratPehlivanoglu/anaconda3/envs/mach/python.exe "c:/code/redi/Order Entry - Equities & Futures.py"
True
win32com.client.VARIANT(16396, None)
(mach) PS C:\code\redi>

Jirapongse · February 2023

@beratp1

Thanks for reaching out to us.

According to this discussion, in Python, you will be able to consume L1 via get. CacheControl is not supported in Python.

Basic Python example code can be found on GitHub: https://github.com/Refinitiv-API-Samples/Example.REDI.Python.BasicExamples.

beratp1 · February 2023

Hi @Jirapongse,

I had been working on the attached code sample that was available in the FTP site: sftp.redi.com. Attaching the file for your review. Abandoning the CacheControl route on Python, will explore the GetL1Value route to stream and circle back.

Thank you.

MarketDataSubscriber_text.txt

Jirapongse · February 2023

@beratp1

The code should look like this: https://github.com/Refinitiv-API-Samples/Example.REDI.Python.BasicExamples/blob/master/l1.py.

l1.py.txt

The output is:

beratp1 · February 2023

@Jirapongse, I have run this code and have received the same response. Is there a line that could keep say Last for Symbol=IBM streaming on either an as updated basis or a certain period to be specified, say every 1 minute.

Thanks.

beratp1 · February 2023

symbolVar.value = "IBM"
ret = q.GetL1Value(symbolVar, "Last", tgtVarName)
print(strftime("%Y-%m-%d %H:%M:%S", gmtime()) + " Symbol=" + tgtVarName.value + " Last" + "=" + str(symbolVar.value) + " success=" + str(ret))

This is the line I'm looking to keep getting the value as the price changes.

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