Parsing Through HTLM Style .txt File

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Adam Holland
Adam Holland 2024-6-13
评论： Ganesh 2024-6-14
I'm trying to read in a txt file with a series of messages describing what is happening during a sporting event. The general format seems to be based on HTML but the file is given as .txt. I'm able to open the file and save it as a variable using fscanf (not sure if this is the most appropiate way for this application). I'm having trouble wrapping my head around how to search for blocks of code that I want to record for further analysis. For example one of things ill be doing is looking for a block like the one below.
<FLAG>
<ID>e9f40b4b-decd-4b47-ae83-e6f9c972c570</ID>
<DT>01.07.2023 16:30:00.000</DT>
<FL>Green</FL>
<LV>Track</LV>
<FI />
</FLAG>
So in plain English i want to look for every time there is <FLAG> and then record the time of day which is denoted by <DT>. I'm pretty rusty with my MATLAB never any reading from .txt files when i was at my best so I think once I get the hand of reading and searching through the file I'll be able to figure it all out from there.

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回答（2 个）

Ganesh
Ganesh 2024-6-13
编辑：Ganesh 2024-6-13
Ran in:
Hi @Adam Holland,
You can consider using the "readstruct()" function in MATLAB. It allows you to input an "XML" file and parses it into a structure. Please find the code implementation of the same below:
a = readstruct('Data.txt',FileType="xml")
a = struct with fields:
FLAG: [1x2 struct]
% You can now access the fields like any normal MATLAB structure
a.FLAG(1)
ans = struct with fields:
ID: "e9f40b4b-decd-4b47-ae83-e6f9c972c570" DT: 01.07.2023 16:30:00.000 FL: "Green" LV: "Track" FI: ""
for i=1:length(a.FLAG)
disp(num2str(i)+ " -- "+a.FLAG(i).ID)
end
1 -- e9f40b4b-decd-4b47-ae83-e6f9c972c570 2 -- e9f40b4b-decd-4b47-ae83-e6f9c972c571
You can read up more on readstruct from the following documentation:
https://www.mathworks.com/help/matlab/ref/readstruct.html
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Adam Holland
Adam Holland 2024-6-13
Thanks so much! I really like how doing it this way breaks it down into a structure variable. For some reason it says that my file isnt a valid xml format but I'll have to keep this method in mind for future projects.
Ganesh
Ganesh 2024-6-14
Do refer to the ".txt" file attached. You might be missing to enclose the whole data within a tag.

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Hassaan
Hassaan 2024-6-13
% Open the file
fileID = fopen('your_file.txt', 'r');
if fileID == -1
error('Could not open file');
end
% Read the file
fileContent = fscanf(fileID, '%c');
fclose(fileID);
% Find all occurrences of <FLAG> blocks
flagStart = strfind(fileContent, '<FLAG>');
flagEnd = strfind(fileContent, '</FLAG>');
for i = 1:numel(flagStart)
% Extract the FLAG block
flagBlock = fileContent(flagStart(i):flagEnd(i)+6); % +6 to include </FLAG>
% Find and extract the time of day (DT)
dtStart = strfind(flagBlock, '<DT>') + 4;
dtEnd = strfind(flagBlock, '</DT>') - 1;
timeOfDay = flagBlock(dtStart:dtEnd);
% Display or save the time of day
disp(['Time of day: ' timeOfDay]);
end
------------------------------------------------------------------------------------------------------------------------------------------------
If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.
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  2 个评论
Hassaan
Hassaan 2024-6-13
@Adam Holland You are welcome.
------------------------------------------------------------------------------------------------------------------------------------------------
If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.
Professional Interests
  • Technical Services and Consulting
  • Embedded Systems | Firmware Developement | Simulations
  • Electrical and Electronics Engineering
Feel free to contact me.

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