QT　读取txt文件的几种方法

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我是靠谱客的博主迷路大米，这篇文章主要介绍QT　读取txt文件的几种方法，现在分享给大家，希望可以做个参考。

废话不说直接上代码

１．

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．

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()<<"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

    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