Reading a comma delimited data stream
I need a clean, preferably simple way, to parse a comma delimited string that enters a local variable once a minute. The variable buffer needs to be cleared before the new string comes in. If you can help and have more questions about this I can send a detailed explanation. thanks in advance.
[email protected]
I placed my code inside a loop and have attached it. The data in the array is replaced every time that the function is called. You can see where I also added a step to reset the string. I am not clear what you mean by "clear what is not overwritten". Do you mean that the string length changes and you want to only display that amount of data? This example should do that. I added a random string length to show that behavior.
I feel like I am missing something about what you want. Do you have an example that shows what you are doing and you can point to where you wnat something different.
Attachments:
comma_delimetd.vi 37 KB
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Convert xls to comma delimited
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can somebody help me on this.
thnks,
i need it programatically pls!!Check the below program :
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Attachments:
Example layout (Not actual).vi 11 KBIf all the data is the same type, then you can wire an array as the datatype instead of a cluster. Set the "data includes array or string size" input to False (the default is True). The output will be an array, and you can index out the values you want.
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Hi,
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Thanks,
RTHi Rob
As far as i know, we can not upload data from
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same.
eg:
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Hope this helps you.
Kind Regards
Eswar -
How to read and parse a comma delimited file? Help
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Spackimport java.util.*;
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[\code] -
Hi,
I have a process with a reader of master data that outputs 5 records that feeds simultaneously into 3 different lookup and return processors.
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Thanks, NikCheers Mike - and for the explanation of the terms.
I think I understand now how it's supposed to work.
What I'm finding however is that when I set a flag to Y at the beginning of a path (that includes a lookup and return and then split records from array processor) that flag is showing no (i.e. an empty) value in SOME of the records shown in the subsequent MDS processor (it's fine the very last split processor before we get to the MDS but then again there are fewer records in that split processor than the MDS).
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Dave
Solved!
Go to Solution.dr8086 wrote:
This method sounds like an excellent suggestion, but I do have a few questions where I dont think I've understood fully.
From what I understand the basic premise is to use one call library function node to access a DLL which creates an instance of the device object, and passes a pointer too it into labview. Then a seperate call library function node would pass this pointer to another DLL which could access the device object, update it and read the data. This part could be in a while loop and carry on reading the data until a stop command is given.
That's it. I'm including some skeleton code as an example. I'm also including the code because I don't know how much you have experience with multi threading, so I'm showing how you'd have to use critical sections to guard the interactions between threads so that they don't lead to issues.
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extern "C" __declspec(dllexport) int __stdcall close(uintptr_t ptr, double last_vals[], int size)
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((CDevice*)ptr)->get_data(last_vals, size);
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public:
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int init();
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dr8086 wrote:
My main concern is that the object may go out of memory or be deallocated, since it wouldnt be held in any namespace or anything.
Since you create the object with new, the object won't expire until either the dll is unloaded or the process (LabVIEW) closes. So the object will stay valid between dll calls provided LabVIEW didn't unload the dll (which it does if the VIs are closed). When that happens, I'm not exactly sure what happens to live objects (i.e. if you forgot to call close), I imagine the system reclaims the memory but the device might still be open.
What I do to make sure that everything gets closed when the dll unloads before I could call close and delete the object is to everytime I create a new object in the dll I add it to a list, when the dll unloads, if the object is still on the list I delete it.
dr8086 wrote:
I also have a more general programming question about the purpose of the buffer. Would the buffer basically be a big table of position values, which are stored until they can be read into the rest of the VI?
Yes, see the example code.
However, depending on the frequency with which you need to collect data from the device you might not need this buffer at all. I.e. if you collect a sample about every 100ms then you could remove all threading and buffer related functions and instead read the data from the read function itself like this:
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Hi,
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SQL to match a single value in a field with comma-delimited text
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I've tried comma delimited on the following set ups. Each set up failed.
SSIS Server 2008 R2 RTM
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Comma delimited file in application server.
How to extarct a comma delimited file from an internal table in to SAP application server.
Hi Arun,
Can you be a bit more clearer? Are you uploading the dat to the appl server or downloading?
1) Comma separated info from itab to file server.
loop at itab.
concatenate itab-field1
itab-field2
itab-field3
into itab_new-data separated by ','.
append itab_new.
clear itab_new.
endloop.
open dataset dsn for output in text mode.
if sy-subrc = 0.
loop at itab_new.
transfer itab_new to dsn.
endloop.
endif.
close dataset.
2) Comma separated info from file to itab.
open dataset dsn for input in text mode.
if sy-subrc = 0.
do.
read datset dsn into itab-data.
if sy-subrc <> 0.
exit.
else.
append itab.
clear itab.
endif.
enddo.
endif.
close dataset.
loop at itab.
split itab-data at ',' into itab_new-field1
itab_new-field2
itab_new-field3.
append itab_new.
clear itab_new.
endloop.
REgards,
Ravi -
Wrapping A SqlBulkCopy Class To Export A Proper Comma Delimited Table
Hello!
If anyone can point me in the right direction it would be greatly appreciated!
In my search, it seems SQL Server cannot export tables to a proper comma delimited format. I have not found a out of the box solution for SQL Server to properly escape commas and double quotes within fields on a record.
Which brings me here. I'm searching for a way to leverage the SqlBulkCopy class (or a alternative) to quickly export a record's values in a array or list so I can feed it into my custom DelimitedStringBuilder class.
So far it seems the out of the box SqlBulkCopy class only supports import into other tables and not a text file.
One thought (I have no idea how I would implement it) would be to attach a DataReader class to the SqlBulkCopy class and then pass the values from the DataReader to my DelimitedStringBuilder class.
Has anyone been able to write something like this? Or is there a simpler solution?Have you tried just using SQL and ExecuteNonQuery? Below is an example:
Dim TextConnection As New System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & "C:\Documents and Settings\...\My Documents\My Database\Text" & ";" & _
"Extended Properties=""Text;HDR=NO;""")
TextConnection.Open()
'New table
Dim TextCommand As New System.Data.OleDb.OleDbCommand("SELECT * INTO [Orders#csv] FROM [Orders] IN '' [ODBC;Driver={SQL Server Native Client 11.0};Server=.\SQLExpress;Database=Northwind;Trusted_Connection=yes];", TextConnection)
TextCommand.ExecuteNonQuery()
TextConnection.Close()
Paul ~~~~ Microsoft MVP (Visual Basic) -
My Firefox v6.02 browser always open *.csv (comma delimited) file in another tab rather than downloading a file? I do not have right click option to save this file. My OP is windows XP sp2.
Hi mha007,
Go to this site "http://www.nseindia.com/content/indices/ind_histvalues.htm"
Select any Index type and from dates select just one day or any number of days. Click "Get Details" button. This will open tabular data on loaded page (with link CSV file link at bottom).
When I click this link, it opens CSV file in new tab (in Firefox browser) and does not open download window (just as in case of other file formats like *.zip, *.rar or *.xls).
Right-click of link does not give "save as" or "save file" option.
Firefox is my preferred and default browser.
========
surprisingly, When I do same thing in IE6 browser, data-table page shows 2 options below table, i.e. (1) download file (2) open file.
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