Vector to String to Comma String?

Question

QString line = "";
std::vector<std::pair<int, QString> >::iterator it = recordingArray.begin();

while(it != recordingArray.end())
{
  line.append(*it);
  line.append(',');
}

The above loops out a vector. I need to convert each part of the pair to a string and then add it into "line".

How can I do this?

possible duplicate of [Printing lists with commas C++](http://stackoverflow.com/questions/3496982/printing-lists-with-commas-c) — Potatoswatter, Dec 10 '12 at 22:44
How is it different? If Qt is an essential ingredient here then you should tag it as such. — Potatoswatter, Dec 10 '12 at 22:46
Duplicate of OP's own question from 2 hours ago... http://stackoverflow.com/questions/13809255/c-vector-to-comma-delimitated-string — Nicu Stiurca, Dec 10 '12 at 23:08

Nicu Stiurca · Accepted Answer · 2012-12-10T23:28:09.770

1

I would use a std::stringstream, then convert that to a QString

std::stringstream ss;
std::vector<std::pair<int, QString> >::iterator it = recordingArray.begin();

for(; it != recordingArray.end(); ++it)
{
  ss << it->first << ' ' << it->second.toStdString() << ',';
}

QString line = QString::fromStdString(ss.str());

EDIT: I'm not sure QString overloads operator<<(std::ostream &out, const QString &qs), so an extra conversion to std::string seems necessary.

edited Dec 10 '12 at 23:28

answered Dec 10 '12 at 22:47

Nicu Stiurca

8,747
8
40
48

aggregate 'std::stringstream ss' has incomplete type and cannot be defined – panthro Dec 10 '12 at 22:59
@user1013512 did you `#include `? – Nicu Stiurca Dec 10 '12 at 23:03
Yes, that fixed that, but your code crashes it now at runtime – panthro Dec 10 '12 at 23:05
@SchighSchagh should `++iter` inside while loop, otherwise infinite loop – billz Dec 10 '12 at 23:15
It's the loop causing the freeze – panthro Dec 10 '12 at 23:25
@billz Aah, good catch. I blindly copied the loop construct from OP's post. – Nicu Stiurca Dec 10 '12 at 23:28

Vector to String to Comma String?

1 Answers1