I need to read xls files in my IOS app. First of all, I want to convert xls files to csv format files, then my app parse csv files, but I can't find any ios library to convert xls to csv, please help me
If you have a .xls file, you can use the open source DHlibxls library to read the file into your app. This is an ObjectiveC framework that wraps a C-based library. The library is quite mature.
ios or any objecive-framework doesn't provide any thing for accesseing Microsoft's xls :(
To convert-xls to/fro csv is itself a project in it!!!
On top of this, there are different format of xls, now xlsx files. And writing a xls and reading it back in proper way is tooooo-cumbursome task to accomplish. However we have managed to read it but it is not 100% efficient :(
I guess in near future you may want to move to xlsx file then your task will be a lot more difficult. You can check yourself, change the file name extension to .zip and unzip you will see many files, one having row numbers, another columns, third with links, fourth with contents and so on. Mapping and getting in correct form in not impossible but needs a lot of work.
There can be many other ways to do, I can suggest to use java api to do, or even save you xls to csv directory from excel, then your work will be easy.
Related
I am working on Symfony-1.1 in an existing project. How can I read pdf files and extract text from them?
It's not a Symfony 1.1 related question, actually. It's a PHP one. There several libraries to handle PDFs in PHP. Following are some suggestions.
https://github.com/smalot/pdfparser
http://pastebin.com/dvwySU1a
http://www.pdflib.com/
If you just need to parse pdf in anyway and then process the text in PHP, you can also consider using a java library like the following.
http://pdfbox.apache.org/ (Is there a PDF parser for PHP?)
I want to write it from scratch so dont want to use existing pdf parsing libraries. Where and how should I start?
You should read the pdf references and read about the different versions of pdfs and how they are structured.
I hope you know that this will take much time (at least over hundreds of hours). It'd be easier to use a existing library if you have the possibility
Here's the reference for PDF Version 1.7 http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
I am using the rails gem called roo to read and parse uploaded Excel and CSV files.
I understand that in roo, the way it reads an Excel file is Excel.new("myfilename"). I am facing issue because I have to read the file uploaded with form helper (upload helper), temp file. I am saving the temp file before reading it with roo/Excel.
Though I am uplaoding good excel files, I am getting
the file is not an Excel/xlsx
error.
Is there a way to directly read from Uploaded IO?
Can you guys tell me what am I doing wrong here?
Thanks!
If you are developing on a Windows box, when you open files, you have to add a 'b' (binary) to the file mode, i.e:
File.open("spreadsheet.xls","rb")
for read only, binary.
Not sure if that's your problem, but I faced a similar problem and that was the solution.
good luck
I am not familiar with roo, but I have used http://rubygems.org/gems/parseexcel
workbook = Spreadsheet::ParseExcel.parse("#{Dir.getwd}/public/excel/foo.xls")
I need to export some data to an .XLS file, pdf, and print.
I already tried the simple solution: exporting it to .CSV with CHCSVWriter. It works for printing and saving it to pdf (I open the CSV in a UIWebView and get the PDF or print from there). However, to use the CSV to be open in excel has two main problems:
1 - First, as the name says, in the CSV the values are separated by commas, and in some versions of Excel, it requires the user to separate 'manually' in cells.
2 - I have hebrew characters, and I already tried all the string encodings, and can't have both hebrew and latin characters.
So, after giving up after days of trying to use CSV to solve the issues above, I gave up. How can I export my data to XLS?
The LibXL library provides this functionality for both xls and xlsx formats. There is no iOS version, but people say the iOS version is coming. You may want to contact LibXL support to confirm this.
EDIT:
The iOS version is available now.
This article explains how to programmatically create an Excel (.xls) file without using any external library. It just opens a file stream and it writes XML contents straight to it.
It is written in C#, but the core information coming out of it is the XML formatting used to create nodes and fill attributes for corresponding cell values and formatting.
Please consider I have not tried this myself, I found it while doing a search. Please feel free to ask if some C# bits are not clear. HTH
So this is another exporting to Excel question.
I have a page that has a table with formatting by stylesheet.
When I export the page by setting the ContentType to application/excel and Content-Disposition to attachment, I can export the table to Excel (not CSV). However, it loses all formatting. I think it's because Excel does not load CSS and I guess that's reasonable.
So, in a scenario where I have to show the table on the web and also export to Excel, both with similar (even if not exact) formatting, what would be the best approach without using something like NPOI?
I am trying to minimize the work and keep the single template if possible. Is it necessary for me to create two separate templates: one with stylesheet, the other with embedded style in the table itself for Excel?
Having a single template with conditional formatting inside would be very messy.
Any ideas?
If you not yet solve the problem I'll recommend you to use Open XML SDK 2.0 for Microsoft Office (see http://www.microsoft.com/downloads/details.aspx?FamilyID=c6e744e5-36e9-45f5-8d8c-331df206e0d0&displaylang=en). With this way you will be able create an XLSX file without installing Excel on the server. XLSX file is compressed (like ZIP file) collection of xml files. Open XML SDK 2.0 helps you create and change XLSX file as pure xml files. At the first time if you look at Open XML SDK a lot of things look like strange, but it's only at the beginning. There are so named "Open XML SDK 2.0 Productivity Tool" (a part of Open XML SDK 2.0) which can generate a lot of useful code for you. Moreover you can create a nice Excel document which you can use as a prototype (template) of the document which you will create. So you can solve the problem of complex formating without writing of a lot of code.
Look at http://msdn.microsoft.com/en-us/library/cc850837(v=office.14).aspx for some examples and on http://openxmldeveloper.org/default.aspx. See also Creating Excel document with OpenXml sdk 2.0 as a start example. You can find also a lot of good stuffs on http://www.codeplex.com about Open XML SDK
there are several aproach
you could instantiate a excel object on your server using VSTO, and then write the document on memory and write to response the native file, but this aproach could be a litle expensive if you create a excel object per request, so you could try to do a singleton object that wraps the excel object instance
You can create a report (rdlc file) with a similar look to the grid. Then, you can have an action where you instantiate a LocalReport, pass the data you want to it and call its Render method. You then return the byte array returned by the Render method.