#include <QCoreApplication> #include <QIODevice> #include <QFile> #include <QTextStream> #include <QString> #include <QDebug> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QFile file(QStringLiteral("F:/QTCode/deleteLineInFile/新建文本文档.txt")); QString allText; if(file.open(QIODevice::ReadWrite)){ QTextStream stream(&file); stream.setCodec("UTF-8"); while(!stream.atEnd()){ QString lineStr = stream.readLine(); if(lineStr == QStringLiteral("也是")){ continue; } allText.append(lineStr); if(!stream.atEnd()){ allText.append('\r'); allText.append('\n'); } } file.close(); if(file.open(QIODevice::WriteOnly | QIODevice::Truncate)){ file.write(allText.toUtf8()); file.close(); qDebug() << QStringLiteral("操作成功"); }else{ qDebug() << QStringLiteral("写文件失败"); } }else{ qDebug() << QStringLiteral("打开文件失败"); } return a.exec(); }