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Home » U++ Library support » U++ Core » GetCsvLine (Reading CSVfile)
GetCsvLine [message #49987] Tue, 12 June 2018 13:20 Go to next message
Upp_User is currently offline  Upp_User
Messages: 8
Registered: May 2017
Location: India
Promising Member
Hi,
Can someone give a small example of implementing GetCsvLine , i have to phrase a csv file. I believe GetCsvLine is the suggested option and i am not sure how to implement it.

Appreciate your timely help.

The csv file can be
Number_of_Lines,3
Line1,L1data1,L1data2,L1data3
Line2,L2data1,L2data2,L2data3
Line3,L3data1,L3data2,L3data3


Thanks
Upp_User.



UPP User
Re: GetCsvLine [message #49988 is a reply to message #49987] Tue, 12 June 2018 14:21 Go to previous messageGo to next message
Oblivion is currently offline  Oblivion
Messages: 556
Registered: August 2007
Location: Turkey
Contributor
Hello Upp User,

#include <Core/Core.h>

using namespace Upp;

CONSOLE_APP_MAIN
{
	const String csvstr = "data1,data2,data3;data4,data5,data6;data7,data8,data9";
	
	StringStream ss(csvstr); // Any Stream derivative will also do (e.g. FileIn)
	auto v = GetCsvLine(ss, ';', CHARSET_DEFAULT);
	for(auto e : v)
		Cout() << e << '\n';
	
}


Best regards,
Oblivion

[Updated on: Tue, 12 June 2018 14:30]

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Re: GetCsvLine [message #49997 is a reply to message #49988] Thu, 14 June 2018 10:41 Go to previous messageGo to next message
Upp_User is currently offline  Upp_User
Messages: 8
Registered: May 2017
Location: India
Promising Member
Thanks a lot Oblivion, I am yet to try, i will keep posted on the outcome.

Best Regards
Upp User.


UPP User
Re: GetCsvLine [message #50783 is a reply to message #49987] Tue, 18 December 2018 12:20 Go to previous messageGo to next message
bozero is currently offline  bozero
Messages: 5
Registered: June 2018
Promising Member
How to parse empty string or data between ',' and '\n'.
Example:

  StringStream ss;
  Vector<String> vs;

  String csvstr = "data1,data2,data3\ndata4,data5,data6\ndata7,data8,data9";
  DUMP(csvstr);

  ss.Open(csvstr);
  while(!ss.IsEof()){
    vs=GetCsvLine0(ss,',',CHARSET_DEFAULT);
    DUMP(vs);
    DUMP(vs.GetCount());
  };

  csvstr.Replace("data3","");
  csvstr.Replace("data6","\"\"");
  csvstr.Replace("data9","\"\",");  // insert a extra comma

  DUMP(csvstr);

  ss.Open(csvstr);
  while(!ss.IsEof()){
    vs=GetCsvLine0(ss,',',CHARSET_DEFAULT);
    DUMP(vs);
    DUMP(vs.GetCount());
  };


Outcome:
csvstr = data1,data2,data3
data4,data5,data6
data7,data8,data9

vs = [data1, data2, data3]
vs.GetCount() = 3

vs = [data4, data5, data6]
vs.GetCount() = 3

vs = [data7, data8, data9]
vs.GetCount() = 3

csvstr = data1,data2,
data4,data5,""
data7,data8,"",

vs = [data1, data2]
vs.GetCount() = 2

vs = [data4, data5]
vs.GetCount() = 2

vs = [data7, data8,]
vs.GetCount() = 3

[Updated on: Wed, 19 December 2018 09:35]

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Re: GetCsvLine [message #50784 is a reply to message #50783] Tue, 18 December 2018 13:00 Go to previous messageGo to next message
Oblivion is currently offline  Oblivion
Messages: 556
Registered: August 2007
Location: Turkey
Contributor
Hello bozero,

There are many ways to achive this, but given your example, the below code would hopefully give you the basic idea:

#include <Core/Core.h>

using namespace Upp;

CONSOLE_APP_MAIN
{
	const String csvstr =  "data1,data2,data3\ndata4,data5,data6\ndata7,data8,data9";

	auto lines = Split(csvstr, '\n');
	
	for(int i = 0; i < lines.GetCount(); i++) {
		String line = lines[i];
		Cout() << "Line: " << i + 1 << ": \n";
		StringStream ss(line); 
		auto v = GetCsvLine(ss, ',', CHARSET_DEFAULT);
		for(auto e : v)
			Cout() << e << '\n';
	}
}



Another simple way:
#include <Core/Core.h>

using namespace Upp;

CONSOLE_APP_MAIN
{
	const String csvstr =  "data1,data2,data3\ndata4,data5,data6\ndata7,data8,data9";

	StringStream ss(csvstr);
	
	int ln = 0;
	while(!ss.IsEof()) {
		auto s = ss.GetLine();
		StringStream line(s);
		auto v = GetCsvLine(line, ',', CHARSET_DEFAULT);
		Cout() << "Line: " << ++ln << "\n";
		for(auto e : v)
			Cout() << e << '\n';
	}
}


These output:

Line: 1: 
data1
data2
data3
Line: 2: 
data4
data5
data6
Line: 3: 
data7
data8
data9


Best regards,
Oblivion

[Updated on: Tue, 18 December 2018 13:17]

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Re: GetCsvLine [message #50791 is a reply to message #49987] Wed, 19 December 2018 09:31 Go to previous message
bozero is currently offline  bozero
Messages: 5
Registered: June 2018
Promising Member
Thank you for your reply and nice example, Oblivion. But my focus on a string with zero length ("") before new line, GetCsvLine() seems just ignore it. Even though a pair double double quotation ("") is put as space holder between (,) and (\n). Shall I need to put extra (,) to end of the each line of CSV before call GetCsvLine ?
void getcsvline_vs_split()
{
	StdLogSetup(LOG_COUT|LOG_FILE);
	const String csvstr =  "data1,data2,\"data3\"\ndata4,data5,\"\"\ndata7,data8,\"\ ",";
	DUMP(csvstr);
	
	Cout()<<"*** Get data via GetCSVLine ***\n";
	StringStream ss(csvstr);
	int ln = 0;
	int total=0;
	while(!ss.IsEof()) {
		auto s = ss.GetLine();
		StringStream line(s);
		auto v = GetCsvLine(line, ',', CHARSET_DEFAULT);
		Cout() << "Line: " << ++ln << "\n";
		for(auto e : v)
			Cout() << "Item " << ++total << " : " << e << '\n';
	}
	Cout()<< "Total line: " << ln << "\nTotal item: " << total << "\n";
	
	Cout()<<"*** Get data via Split ***\n";
	ln = 0;
	total=0;
	ss.Open(csvstr);
	while(!ss.IsEof()) {
		auto s=Split(ss.GetLine(),',');
		Cout() << "Line: " << ++ln << "\n";
		for(auto e : s)
			Cout() << "Item " << ++total << " : " << e << '\n';
	}
	Cout()<< "Total line: " << ln << "\nTotal item: " << total << "\n";
}


output:
csvstr = data1,data2,"data3"  // string with "" 
data4,data5,""                // empty string    
data7,data8,"",               // extra comma at the end of line

*** Get data via GetCSVLine ***
Line: 1
Item 1 : data1
Item 2 : data2
Item 3 : data3    // string with "" is stripped 
Line: 2
Item 4 : data4
Item 5 : data5    // expected empty string item "" is miss
Line: 3
Item 6 : data7
Item 7 : data8
Item 8 :          // extra comma append for empty string item ""
Total line: 3
Total item: 8
*** Get data via Split *** // just compare with split
Line: 1
Item 1 : data1
Item 2 : data2
Item 3 : "data3"  // string with ""
Line: 2
Item 4 : data4
Item 5 : data5
Item 6 : ""       // string with ""
Line: 3
Item 7 : data7
Item 8 : data8
Item 9 : ""       // string with ""
Total line: 3
Total item: 9

[Updated on: Wed, 19 December 2018 09:33]

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