【Qt】Qt-文本文件读写

读取文本文件（编码UTF8）

QString filename = "";
QFile file(filename);
if (!file.open(QIODevice::Text | QIODevice::ReadOnly))
{
    log("Open file failed!");
    return;
}

QTextStream in(&file);
in.setCodec("UTF-8");

QString line = in.readLine();

while (!line.isNull())

{

    // DO

    line = in.readLine();

}

file.close();







写文本文件

QFile file(exportFile); 

if (!file.open(QIODevice::Text | QIODevice::WriteOnly | QIODevice::Truncate)) 

{ 

    // 打开文件失败 

    file.close(); 

    MSGBOX_INFO("Dictionary", QString("Open %1 failed!").arg(exportFile), ""); 

    return; 

}

 

QTextStream out(&file);
out.setCodec("UTF-8");

// 输出表头
out << m_headlist.join(",") << endl;

QMap<int, int> idColumnMap;

int total = totalResults.size();
int current = 0;

for (auto item : totalResults)
{
QStringList itemLst;
item.toLst(itemLst);

out << itemLst.join(",") << endl;

current++;
if (current % 10 == 0)
{
    QString process = QString("Export All: %1/%2, %3%").arg(current).arg(total).arg(current / (total+1));
    ui->label_15->setText(process);

    QCoreApplication::processEvents();
}
}

QString process = QString("Export All: %1/%2").arg(current).arg(total);
ui->label_15->setText(process);

file.close();