文件读写

最新推荐文章于 2023-11-13 16:04:28 发布

原创最新推荐文章于 2023-11-13 16:04:28 发布 · 392 阅读

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#properties #file

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本文介绍了一个使用Qt框架实现文件导出功能的例子。主要包括通过对话框选择保存位置及名称，以UTF-8编码将指定数据写入到选定的文件中。同时展示了如何打开已存在的文件并读取其内容。

void MainWindow::exportAllProperties() { QString filename = QFileDialog::getSaveFileName( this, "Open Document", QDir::currentPath(), "Properties Fils(*.property);;All files(*.*)"); if (!filename.isNull()) { QMessageBox::information(this, "Document", "You give name:" + filename, QMessageBox::Ok | QMessageBox::Cancel); QFile file(filename); if (!file.open(QIODevice::WriteOnly)) { QMessageBox::information(this, "Document", "Cant open:" + filename, QMessageBox::Ok | QMessageBox::Cancel); return; } QTextStream out(&file); out.setCodec("UTF-8"); out << "1" << " " << "2" << " " << "3" << endl; out << "1" << " " << "2" << " " << "3"<< endl; out << "1" << " " << "2" << " " << "3"<< endl; out << "1" << " " << "2" << " " << "3"<< endl; out << "1" << " " << "2" << " " << "3"<< endl; file.close(); } } void MainWindow::exportTopoShip() { QString filename = QFileDialog::getOpenFileName( this, "Open Document", QDir::currentPath(), "Properties Fils(*.property);;All files(*.*)"); if (!filename.isNull()) { //用户选择了文件 // 处理文件 QMessageBox::information(this, "Document", "Has document", QMessageBox::Ok | QMessageBox::Cancel); QFile file(filename); if (!file.open(QIODevice::ReadOnly)) { QMessageBox::information(this, "Document", "Cant open:" + filename, QMessageBox::Ok | QMessageBox::Cancel); return; } QTextStream out(&file); QString str = out.readAll(); QMessageBox::information(this, "Document", "Contxt:/n" + str, QMessageBox::Ok | QMessageBox::Cancel); } else // 用户取消选择 QMessageBox::information(this, "Document", "No document", QMessageBox::Ok | QMessageBox::Cancel); }