QTextStream的使用

最新推荐文章于 2025-06-28 15:17:06 发布

杨过悔

最新推荐文章于 2025-06-28 15:17:06 发布

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分类专栏： Qt编程笔记

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本文详细介绍了如何使用QTextStream类在Qt中进行文件的读写操作，包括文本的输出和输入，以及如何确保编码正确性。

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#include <QCoreApplication>
#include <QTextStream7gt;
#include <QFile>
#include <QDebug7gt;

void write()
{
    QFile file("C:/Test/simple.txt");
    if(file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        // We're going to streaming text to the file
        QTextStream stream(&file);

        stream << "Debussy\n";
        stream << "Rabel\n";

        file.close();
        qDebug() << "Writing finished";
    }
}

void read()
{
    QFile file("C:/Test/simple.txt");
    if(file.open(QIODevice::ReadOnly|QIODevice::Text))
    {
        // We're going to streaming the file
        // to the QString
        QTextStream stream(&file);

        QString line;
        do {
            line = stream.readLine();
            qDebug() << line;
        } while(!line.isNull());

        file.close();
        qDebug() << "Reading finished";
    }

}

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

    write();
    read();

    return a.exec();
}

Output:

Writing finished
"Debussy"
"Rabel"
""
Reading finished

It's also common to use QTextStream to read console input and write console output. QTextStream is locale aware, and will automatically decode standard input using the correct codec. Example:

QTextStream stream(stdin);
QString line;
do {
    line = stream.readLine();
} while (!line.isNull());