How to read Excel data from C++ project - c++

I my c++ project I want to open an excel file and query data and identify the rows that matches the specific column values(more than one column). What is the best methodology to connect to excel and query the worksheets?
The excel might contain several thousands of records and hence it is very important to complete the search and show the results in quick time and optimum performance.
Request you to let me know more than one option and suggest the best out of it.

See here for a library (under an open CPOL) license another Stackoverflow user recommends:
https://stackoverflow.com/a/2879322/444255

Related

Pentaho reports localization into not supported languages

I am from Slovakia, I wouldn't be surprised if most of you haven't heard about it.
However, that causes me a troubles when it comes to reports. We need to have 3 (soon 4) language versions of each report: Slovak is main language, than, Polish and English.
Since pentaho does not support Polish nor Slovak, it is really pain for me to keep these localized.
What I do is:
Create report in Slovak language
Write down all phrases from report
Send phrases to one of our partners to translate
Create its copy in either pl/en directory
Open it in Report Designer and edit every phrase accordingly
Save as another language version
As you can imagine, the process is very time consuming, and error prone. Plus, every time I add new parameter to report or change its data source (which is BeanShell script), I need to do it in 3 separated files. As a result of this, language mutations are usually out of date, way behind main language version.
I have tried to automate it with OneSky and did a python script that does 2 stages:
Stage 1 (extract and upload):
Change *.prpt files sufix to *.zip
Extract phrases from files: ~/datadefinition.xml, ~/layout.xml, ~/styles.xml, ~/datasources/inline-ds.xml
Put those phrases into *.po file
Export *.po file into OneSky
Stage 2 (download and import):
Change *.prpt files sufix to *.zip
Download translated *.po file from OneSky
Run through ~/datadefinition.xml, ~/layout.xml, ~/styles.xml, ~/datasources/inline-ds.xml files and replace original phrases by translated
While this aproach works fine, it doe not translate everything. There are still flaws of this process. I need to go through it every time I do even slightest change in data source of report or fix small mistakes. Even if I just do a small six in SQL code, I need to do it in 3 files. That of course increases chance to mistake be made.
Soo, I was wondering, how are you guys solving this issue with translating of your reports?
I will share very simple method which we are following.
1)create a properties file with key value format for each language for resource labels(for static values)
2)put it into resources folder(report-designer/resources/)
3)Based on the parameter you can specify which properties file to select and you can specify keys into value field so that it can understand which value to display in which language.
4)if you need to convert the data which are coming from database,you have to design data warehouse specify all the mappings,accordingly it can fetch the data.
5)For converting dates and currency symbols or number format you can use inbuilt functions which can handle all this things,i am using mysql and mysql has translation functions which can handle all such things.
it is difficult to explain entire process here, but if you can get and idea from this it can be useful to you.

how to realize a network-based book query system

Please notice that if i do not want to use database.
i am now learning Unix networking programming. And i have my university book library all book list in seperated txt files. for example, the 'b' begin books is stored in b.txt. all a-z book count is about 1 million record. a line for a book' name and detailed other info.
Now i want to do a program to provide the query service of book list, for example, giving a book name, it can return the detailed info of this bool is it exists.
So i need to first build a module to take the function of query.
Then write the server side to call the query module and get the result and sending the result to the client module.
My question is , if i do not using database. How to realize the query module using c/c++, just first locating the first letter, for example, H begin book name should find in H.txt or H1.txt and H2.txt, using fopen open the file, then read line by line, then compare with queried book name using strFind, strCmp similar function, if have then return the result. i just think this is a time consuming thing and is not realize for using. And if have any such query system could for reference not using database but is bearable in time?
There are several options. The cheapest option (=low development time, low maintenance, low hardware requirements), IMO, is to create a html page on a separate site that links to all the data files. Then you set up another page that uses google.com to search that site. Then you just tell the google web spider to index your site. That way you get excellent performance with minimal work. But... you don't get to program any C.
Simple solution using C:
Do as you yourself suggest. If you have lots of memory available for file caching the performance won't be so bad unless the load gets high.
There will still be some work to do with the rest of the solution since you should delegate the search to worker threads.
Intermediate solution using C:
Find a 3rd party search engine and integrate it with your network code.
Advanced solution using C:
Implement your own search engine.
The problem is WHY DON'T U WANT TO USE DATABASE ?
1. make it easier to deploy?
sqlite may a good choice .
2. trying another method ?
lucene is a good choice of information retrieval, which is written by java.
clucene is someone rewrite the lucene to c .
You may also need stemmer tool(get the root of words),ictclas(chinese words' term extract) etc .
3. would like to do anything by yourself ?
It is easy to manage text file in system , while , as for a "query system", store is not enough , the main problem is IR(information retrieval ).
You may learn something about index building, store and query the index

Graph plotting in Excel from C++ application

My C++ application generates a .csv file containing 10000 floats.
Now the requirement is that there should be a graph in the same file depicting those floats.
I understand that csv files cannot have graphs. So I have to switch to Excel
Assuming I can write data into columns in excel sheet can anybody tell me if there is any function that I can call in my C++ program which will plot the data in excel sheet?
I have seen some solutions based on Python, but I am exploring if it is possible from C++ only.
www.google.com/search?q=C%2B%2B+Excel+OLE
The MSDN documentation is also often useful.
Try this library SimpleXlsxWriter. It is possible to plot basic graphs on the separate sheet in the excel book. There are also some examples of using on the wiki page of the project
The library provides no external dependencies
This might be of use, especially the last chapter:
www.maths.manchester.ac.uk/~ahazel/EXCEL_C++.pdf
CSV is a graph format.
It stands for Comma Separated Value.
You can load this file into Excel.
It will also import into SQL, MYSQL use (PHPMyadmin for this).
SQL stands for Structured Query Language. MYSQL is web based.
Best wishes to you.
http://www.whatisacnc.com

Prgrammably making excel spreadsheets (97 - 2003 format)

I was wondering how difficult it would be to make an application like this. Basically, I have some old html files that use tables. I want to put these tables into excel for easier reading and manipulation. I only have text, I have no numbers of formulas or anything.
Are there any tutorials on how to do this sort of thing?
The application would produce .xls
Thanks
You have three options:
Output a CSV file. While not an XLS file, Excel is more than capable of opening such a file, and it's extremely easy to create. You need nothing more than standard C++ to implement this solution. This is by far the easiest and quickest way to output to Excel (or any spreadsheet program, for that matter).
Use OLE automation. Microsoft even has a Knowledge Base article that provides an example of how to invoke Excel from your native C++ application and fill in some values. If you absolutely need to output XLS files, this is the easiest way to go. Note that users must have Excel installed on their computers for this to work.
Create your own XLS writer. Don't even bother with this option unless you really want to generate XLS files without requiring Excel to be installed on end-user computers. Options 1 and 2 are more than good enough for just about any application.
You don't need to reverse-engineer the XLS format; Microsoft documents the excel file format here. Due to the evolution of Excel over the years, it's not exactly a clean specification.
If you don't mind installing a copy of Excel along with your program, using OLE Automation would be much easier.
The simplest thing to do is simply create a CSV file. If you have column headers, put them in the first row. CSV files can be opened natively in Excel as if they were Excel spreadsheets.
There is a trick here: save .html tables with the .xls extension and Excel can read them (ie Excel can read the output of the DataGrid control).
But, if you want to create 'real' Excel files, then you can either use Excel Interop (which could be messy, requires Excel and the PIA's to be installed on the machine, and needs careful memory management (since its COM)). You could also opt for a 3rd-party library like FlexCel - which will avoid many of the InterOp problems but will not give you 'complete' Excel functionality (addins, custom vba macros etc.). For most uses, however, a 3rd party library should do the trick.
Looks like there's another alternative called ExcelFormat. I didn't try it, though.

excel in django

How can i make user to downlaoad a excel from the django app.i HAVE A MODEL WHICH gives the report.Now i want a option from user can download the file in excel form.ANy Solution
You can output the data as .csv which is easily imported into MS Excel.
http://docs.djangoproject.com/en/dev/howto/outputting-csv/
EDIT
After I wrote that I got curious if there actually was some way to do it directly to excel format and found:
http://www.python-excel.org/
That made me wonder why you didn't google your question before posted it here.....
I'm not sure quite what you're asking. If you're asking how can you generate output that's able to be read into Excel, IMO your best bet is using a CSV (see amoeba's response) as that's pretty generic. There are ways of using true Excel formats as well.
I'm thinking though that perhaps you're asking how you can have a user click a link (or whatever) and have Excel pop up with your data in it? (IOW, you've already generated the output).
I suppose I'd say a few things:
1) It shouldn't be specific to Excel, many users use things like OO.o (thus my CSV suggestion)
2) It's going to vary depending on their browser and how they have it set up. Personally, I don't like pages opening up the "proper application" so I turn all of that off - other people enable it.