public static final String DATA = "resources/data/united_states.csv";
I need to know about what is the use of .csv file in WaterMarking.java example? And what is its content?
It's an ordinary CSV file containing information about the states of the United States: http://itextpdf.com/sites/default/files/united_states.csv
Related
I am able to read the file as byte
final bytes = File("path....").readAsBytesSync();
//now, here is the problem
final doc = PdfDocument.load(parserBase);
★ that abstract class PdfDocumentParserBase(bytes) takes Uint8list as its argument which is also a parameter for
PdfDocument.load(parserBase)
, am not good at abstract classes and don't know how to use it in the method.
What I want to achieve is merging multiple pdf files.
Please help me out.
Thanks
Hi is there a method from which I can update a specific line in a file.
My file has data seperated by line break
Sample example to delete line but I have to write everything into file again, can I perform CRUD opertion directly on file lines ?
I want to update specific line in file wihout reading entire file => update string and => write all lines to file.
I may switch to any kind of file type that can offer me this functionality.
Is there a way to store data in row column architecture like sql ?
import 'dart:io';
Future<void> myAsyncFunction() async {
const index = 5;
final File f = File('test.txt');
final List<String> lines = await f.readAsLines();
lines.removeAt(index);
await f.writeAsString(lines.join('\n'));
}
This should be possible by using the String Scanner library, it provides a class called LineScanner and LineScannerState through which you can set the position.
I have not tried this for the exact use case you mention above, so please do evaluate it for your use-case
Files are stored as a contiguous array of bytes on a disk, there is no way to remove a specific line without scanning for newlines and shifting trailing data to fill the void.
For a more sophisticated way of storing data there are many popular database packages, including sqflite, hive, drift, sembast, and objectbox.
Hi everyone dose anybody know in what format data is generated in input field? What i really need to do is take information from input field and generate image with the same text.
Its a string, to get it
string textToParse = gameObjectThatHasInputField.GetComponent<InputField>().text;
If you put resources in resource folder you can generate with Resources.Load
https://docs.unity3d.com/ScriptReference/Resources.Load.html
I am opening an existing Excel file using SpreadsheetGear, using the following code:
SpreadsheetGear.IWorkbook xlBook = SpreadsheetGear.Factory.GetWorkbook(fileName, System.Globalization.CultureInfo.CurrentCulture);
xlBook.SaveAs(fileNameCSV, SpreadsheetGear.FileFormat.CSV);
This works, but the saved CSV file contains the wrong sheet.
Can anyone help with a code snippet on how to open an Excel file in SpreadsheetGear, then save only a SPECIFIC sheet to a CSV file.
Please note I am working with SpreadsheetGear and want a solution for that library. Thanks!
The IWorksheet interface includes a SaveAs(...) method for just this purpose:
using SpreadsheetGear;
using System.Globalization;
...
IWorkbook xlBook = Factory.GetWorkbook(fileName, CultureInfo.CurrentCulture);
xlBook.Worksheets["My Sheet"].SaveAs(fileNameCSV, FileFormat.CSV);
I'll also mention that there is also an IRange.SaveAs(...) method if you want to save just a particular range to CSV / UnicodeText (tab-delimited).
I am working on a project where I need to read some generic text...I am looking for any api by I can read generic text and also can convert it to .csv file...
Can any one plz help...
using java on windows os...
--------------------------MORE Detail---------------------------------------------------------------------------------------
let me clarify:
Assume I have a pdf document or for that matter any file type document. I intend to use Print to Generic text printer option and get the file in that format.Finally, I intend to use some API which shoudl enable me to programatically read this Generic Text Format file. I intend to extract text from this generic text file.
So, be it any file (.doc/.pdf/.xls etc wtatever), I intend to create a Generic Text Format file using print option. Then run my code to read those files and extract some information.
PS: Assume that I have a Status report form with standard fields. Ok. But, some people might submit in .pdf, some in .doc , some in text format. But, every document contains same fields, but probably with diferent layouts.
Now, I am looking for a generic solution, by which i shoudl be able to convert every file type in to generic text file format and then apply some logic to extract my Status report fields.
In Java this is more or less what you need to read a text file, assuming it's comma separated (just change the string in the "line.split" method if you need something else). It also skips the header.
public void parse(String filename) throws IOException {
File file = new File(filename);
FileInputStream fis = new FileInputStream(file);
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(isr);
String line;
int header = 1;
while ((line = br.readLine()) != null) {
if (header == 1) {
header = 2;
continue; // skips header
}
String[] splitter = line.split(",");
// do whatever
System.out.println(splitter[0]);
}
}
CSV is a format for data in columns. It's not very useful for, say, a Wikipedia article.
The Apache Tika library will take all kinds of data and turn it into bland XML, from which you can make CSV as you like.
It would help if you would edit your question to clarify 'generic' versus' generated', and tell more about the data.
As for Windows printer drivers, are you looking to do something like 'print to pdf' as 'print to csv'? If so, I suspect that you need to start from MSDN samples of printer drivers and code this the hard way.
The so-called 'generic text file format' is not a structured format. It's completely unpredictable what you will find in there for any given input to the printer system.
A generic free book: Text Processing in Python
Just used the standard Java classes for I/O:
BufferedWriter, File, FileWriter, IOException, PrintWriter
.csv is simply a comma-separated values file. So just name your output file with a .csv extension.
You'll also need to figure out how you'd like to split your content.
Here are Java examples to get you going:
writing to a text file
how to read lines from a file