wfd | flowable workflow designer base on @ antv/g6 | BPM library
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flowable workflow designer base on @antv/g6
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QUESTION
this is my first time asking questions here. I'm currently learning C and Linux at the same time. I'm working on a simple c program that use system call only to read and write files. My problem now is, how can I read the file and compare the string/word are the same or not. An example here like this:
foo.txt contains：
...ANSWER
Answered 2022-Mar-08 at 05:19If you must use the read and write system calls, you will have to build an abstraction around them, as they have no notion of lines, words, or characters. Semantically, they deal purely with bytes.
Reading arbitrarily-sized chunks of the file would require us to sift through looking for line breaks. This would mean tokenizing the data in our buffer, as you have somewhat shown. A problem occurs when our buffer ends with a partial line. We would need to make adjustments so our next read call concatenates the rest of the line.
To keep things simple, instead, we might consider reading the file one byte at a time.
A decent (if naive) way to begin is by essentially reimplementing the rough functionally of fgets. Here we read a single byte at a time into our buffer, at the current offset. We end when we find a newline character, or when we would no longer have enough room in the buffer for the null-terminating character.
Unlike fgets, here we return the length of our string.
QUESTION
I am writing my http server. I use select function and see that socket is ready to write any time, but can be read only after thousands of iterations. If I use select(Max+1, &rfd, NULL, NULL, NULL), I do not have such problem. Why it is ready to read only after so many iterations?
...ANSWER
Answered 2022-Feb-02 at 11:28A socket will always be writable, unless you fill up its buffers.
So select will return immediately for every call, with all the sockets marked as writable.
Only add sockets to the write-set when you actually have something to write to them. And once you have written all you need, then remove them from the set and don't add them back (until the next time you need to write to the socket).
When you don't use the write-set, then select will simply not return until there's a socket active in the read-set.
QUESTION
I am trying to merge 1000+ csv files using the following code:
...ANSWER
Answered 2022-Jan-13 at 10:27If memory is the constraint, then one pandas-based solution is to iterate over chunks of rows:
QUESTION
I need to create a view out of a query I wrote. This issue is that this one contains a declare and a CTE. Now I know that the CTE should be fine but that the declare raises an issue. A part of the code is:
...ANSWER
Answered 2021-Dec-07 at 11:16As I mention in the comments, you can't define a variable in a VIEW. A VIEW must be made up of a single statement that results in a SELECT; variables therefore can't be defined as that's 2+ statements.
As I also mention, I suggest against an rCTE for creating a calendar. They are slow and if your results need more than 100 rows you may well get errors if you don't define the MAXRECURSION value in your OPTION clause of the outer query.
Instead use an inline tally or a calendar table to get the needed dates. I use a tally here, but I personally recommend the latter (though with no sample data, this is untested):
QUESTION
I am currently trying to take ten different text files (file2_0.txt, file2_1.txt,file2_2.txt,...) all containing one column and one hundred million rows of random integers and add the text files row by row. I want to add every row from all ten files together and generate a new text file (total_file.txt) with the sum of each row. Below is an example of what I am trying to do using two of the files added together to create total_file.txt.
file2_0.txt
...ANSWER
Answered 2021-Oct-04 at 23:38I'd use generators so you don't have to load all of the files into memory at once (in case they're large)
Then just pull the next value from each generator, sum them, write them and carry on. When you hit the end of the file you'll get a StopIteration exception and be done
QUESTION
I am trying to integrate gitlab CI on my node project, I have SSH access, but my script stop with error :
...ANSWER
Answered 2021-Aug-23 at 08:05Try changing your repo origin on server using this command:
QUESTION
I have to deal with an old piece of software written in Fortran (mainly written in the 70's and badly maintained up to 3 years ago).
I am trying to get it compiled with VS2017 and the Intel oneAPI compiler (Fortran Compiler Classic 2021.3.0) for 64-bits architectures.
In the process of updating one of its modules, I convinced myself that the compiler does not support what I have learned to be called "host association" between subroutines (via CONTAINS statement). None of the symbols defined in a containing subroutine seems to be visible in the contained subroutine (if I use IMPLICIT NONE in the contained subroutine the compiler tells me that I need to declare all of them while if I don't, the compilers gets the declarations very wrong and not matching with the declarations in the containing subroutine. Lots of misleading error messages are printed).
Can somebody of you confirm that this is the case or provide the compiler options to enable this feature that clearly was allowed in the past by some compilers? If needed I will post the source code (I am not posting it immediately because I think this could be a very naive question for a Fortran expert, I am instead a total novice).
Sincerely,
HERE I COMPLEMENT THE ORIGINAL POST AS REQUESTED IN THE COMMENTS
Original code:
...ANSWER
Answered 2021-Jul-19 at 23:31Internal procedures (following a CONTAINS) can see all entities declared in the "host scope" (before the CONTAINS), and can see other internal procedures, but cannot see entities declared within other internal procedures. Host association goes up the tree only. For example:
QUESTION
In my code, multiprocessing Process is being used to spawn multiple impdp jobs (imports) simultaneously and each job generates a log file with the dynamic name:
...'/DP_IMP_' + DP_PDB_FULL_NAME[i] + '' + DP_WORKLOAD + '' + str(vardate) + '.log'
ANSWER
Answered 2021-Jun-11 at 22:34You should create some kind of structure where you store the needed variables and process handles. Block with join after that loop until all subprocesses are finished and then work with the resulted files.
QUESTION
I have a problem connecting to the ipmi server via paramiko in this code:
...ANSWER
Answered 2021-May-26 at 08:45Your server/device seems to require some dummy keyboard interactive authentication:
QUESTION
I am trying to list a directory with FindFirstFileW and FindNextFileW in python using ctypes. The FindFirstFileW is successful but FindNextFileW or FindClose results in OSError: exception: access violation writing 0xFFFFFFFFB8093F80
This is the code:
...ANSWER
Answered 2021-Apr-06 at 22:28You haven't set .argtypes and .restype appropriately for the functions being used. ctypes assumes return values are c_int for example, but handles are 64-bit on 64-bit Python and getting truncated to 32 bits. Plus you get the added benefit of type checking your calls since ctypes knows what the parameter types are supposed to be.
Also recommend .errcheck for automatically checking return values:
Try this:
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