废话不说直接上代码
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１．
QString displayString;
QFile file("/home/alvin/text.txt");
if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
{
qDebug()<
}
while(!file.atEnd())
{
QByteArray line = file.readLine();
QString str(line);
qDebug()<< str;
displayString.append(str);
}
ui->textEdit->clear();
ui->textEdit->setPlainText(displayString);
２．
QString displayString;
QFile file("/home/alvin/text.txt");
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
return;
QTextStream in(&file);
QString line = in.readLine();
while (!line.isNull())
{
// process_line(line);
line = in.readLine();
displayString.append(line);
}
ui->textEdit->clear();
ui->textEdit->setPlainText(displayString);
３．
QString displayString;
QFile file("/home/alvin/text.txt");
if(!file.open(QIODevice::ReadWrite | QIODevice::Text)) {
qDebug()<
}
QTextStream stream(&file);
QString line_in;
stream.seek(file.size());//将当前读取文件指针移动到文件末尾
int count = 0;
while(count < 10)
{
stream << QObject::trUtf8("新建行:") <
}
stream.seek(0);//将当前读取文件指针移动到文件开始
while( !stream.atEnd())
{
line_in = stream.readLine();
displayString.append(line_in);
qDebug() << line_in;
}
ui->textEdit->clear();
ui->textEdit->setPlainText(displayString);
以上是三种ＱＴ读取文件的方法，
源码在这里自行下载查看
https://pan.baidu.com/s/1pKIwzHL
Txt文件的写入的方法
QFile f("./test.txt");if(!f.open(QIODevice::WriteOnly |QIODevice::Text))
{
cout<< "Open failed." <
}
QTextStream txtOutput(&f);
QString s1("123");
quint32 n1(123);
txtOutput<< QString::fromStdString(str_json) <
txtOutput<< n1 <
f.close();
转播
