Qt_IM_17 - 8BitsCoding/RobotMentor GitHub Wiki

#include <QtCore/QCoreApplication>

#include <qiodevice.h>
#include <qdir.h>
#include <qfile.h>
#include <qstring.h>
#include <qbytearray.h>
#include <qdebug.h>

bool put(QString path, QByteArray data, QIODevice::OpenMode mode) {
	QFile file(path);

	if (!file.open(mode)) {
		qWarning() << file.errorString();
		return false;
	}

	qint64 bytes = file.write(data);

	if (!bytes) {
		qWarning() << file.errorString();
	}
	else {
		qInfo() << "Wrote " << bytes << "to the file!";
	}

	file.flush();	// not really needed
	file.close();

	return true;
}

void write(QString path, QByteArray data) {
	qInfo() << "Write to file";
	if (put(path, data, QIODevice::WriteOnly)) {
		qInfo() << "Data written to file";
	}
	else {
		qWarning() << "Failed to write to file";
	}
}

void append(QString path, QByteArray data) {
	qInfo() << "Write to file";
	if (put(path, data, QIODevice::Append)) {
		qInfo() << "Data written to file";
	}
	else {
		qWarning() << "Failed to write to file";
	}
}

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);

	QString path = QDir::currentPath() + QDir::separator() + "test.txt";
	qInfo() << "path: " << path;

	QByteArray data("Hello World!\r\n");
	// Windows = \r\n
	// UNIX = \n

	for (int i = 0; i < 5; i++) {
		QString num = QString::number(i);
		num.append(" ");

		QByteArray line(num.toLatin1() + data);
		write(path, line);
	}

	return a.exec();
}