废话不说直接上代码
![](https://images2017.cnblogs.com/blog/1035773/201711/1035773-20171122144754399-803365271.png)
1.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | QString displayString; QFile file( "/home/alvin/text.txt" ); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) { qDebug()<< "Can't open the file!" <<endl; } while (!file.atEnd()) { QByteArray line = file.readLine(); QString str(line); qDebug()<< str; displayString.append(str); } ui->textEdit->clear(); ui->textEdit->setPlainText(displayString); |
2.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | QString displayString; QFile file( "/home/alvin/text.txt" ); if (!file.open(QIODevice::ReadWrite | QIODevice::Text)) { qDebug()<< "Can't open the file!" <<endl; } 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:" ) <<++count<< "/n" ; } 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
1 | https: //pan.baidu.com/s/1pKIwzHL |
Txt文件的写入的方法
![复制代码](https://common.cnblogs.com/images/copycode.gif)
QFile f("./test.txt");
if(!f.open(QIODevice::WriteOnly | QIODevice::Text))
{
cout << "Open failed." << endl;
return data;
}
QTextStream txtOutput(&f);
QString s1("123");
quint32 n1(123);
txtOutput << QString::fromStdString(str_json) << endl;
txtOutput << n1 << endl;
f.close();
![复制代码](https://common.cnblogs.com/images/copycode.gif)
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