QT二进制文件读写应用程序示例

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QFileDialog> #include <QDataStream> #include <QMessageBox> //#include "qw.h" void MainWindow::resetTable(int aRowCount) { //表格复位，先删除所有行，再设置新的行数，表头不变 // QStringList headerList; // headerList<<"测深(m)"<<"垂深(m)"<<"方位(°)"<<"总位移(m)"<<"固井质量"<<"测井取样"; // theModel->setHorizontalHeaderLabels(headerList); //设置表头文字 theModel->removeRows(0,theModel->rowCount()); //删除所有行 theModel->setRowCount(aRowCount);//设置新的行数 // QStandardItem *aItem; // QModelIndex index; QString str=theModel->headerData(theModel->columnCount()-1, Qt::Horizontal,Qt::DisplayRole).toString(); for (int i=0;i<theModel->rowCount();i++) { //设置最后一列 QModelIndex index=theModel->index(i,FixedColumnCount-1); //获取模型索引 QStandardItem* aItem=theModel->itemFromIndex(index); //获取item aItem->setCheckable(true); aItem->setData(str,Qt::DisplayRole); aItem->setEditable(false); //不可编辑 } } bool MainWindow::saveDataAsStream(QString &aFileName) {//将模型数据保存为Qt预定义编码的数据文件 QFile aFile(aFileName); //以文件方式读出 if (!(aFile.open(QIODevice::WriteOnly | QIODevice::Truncate))) return false; QDataStream aStream(&aFile); aStream.setVersion(QDataStream::Qt_5_9); //设置版本号，写入和读取的版本号要兼容 qint16 rowCount=theModel->rowCount(); //数据模型行数 qint16 colCount=theModel->columnCount(); //数据模型列数 aStream<<rowCount; //写入文件流，行数 aStream<<colCount;//写入文件流，列数 //获取表头文字 for (int i=0;i<theModel->columnCount();i++) { QString str=theModel->horizontalHeaderItem(i)->text();//获取表头文字 aStream<<str; //字符串写入文件流，Qt预定义编码方式 } //获取数据区的数据 // qint16 ceShen; // qreal chuiShen; // qreal fangWei; // qreal weiYi; // QString zhiLiang; // bool quYang; // QStandardItem *aItem; for (int i=0;i<theModel->rowCount();i++) { QStandardItem* aItem=theModel->item(i,0); //测深 qint16 ceShen=aItem->data(Qt::DisplayRole).toInt(); aStream<<ceShen;// 写入文件流，qint16 aItem=theModel->item(i,1); //垂深 qreal chuiShen=aItem->data(Qt::DisplayRole).toFloat(); aStream<<chuiShen;//写入文件流， qreal aItem=theModel->item(i,2); //方位 qreal fangWei=aItem->data(Qt::DisplayRole).toFloat(); aStream<<fangWei;//写入文件流， qreal aItem=theModel->item(i,3); //位移 qreal weiYi=aItem->data(Qt::DisplayRole).toFloat(); aStream<<weiYi;//写入文件流， qreal aItem=theModel->item(i,4); //固井质量 QString zhiLiang=aItem->data(Qt::DisplayRole).toString(); aStream<<zhiLiang;// 写入文件流，字符串 aItem=theModel->item(i,5); //测井 bool quYang=(aItem->checkState()==Qt::Checked); aStream<<quYang;// 写入文件流，bool型 } aFile.close(); return true; } bool MainWindow::openDataAsStream(QString &aFileName) { //从Qt预定义流文件读入数据 QFile aFile(aFileName); //以文件方式读出 if (!(aFile.open(QIODevice::ReadOnly))) return false; QDataStream aStream(&aFile); //用文本流读取文件 aStream.setVersion(QDataStream::Qt_5_9); //设置流文件版本号 qint16 rowCount,colCount; aStream>>rowCount; //读取行数 aStream>>colCount; //列数 this->resetTable(rowCount); //表格复位 //获取表头文字 QString str; for (int i=0;i<colCount;i++) aStream>>str; //读取表头字符串 //获取数据区文字， qint16 ceShen; qreal chuiShen; qreal fangWei; qreal weiYi; QString zhiLiang; bool quYang; QStandardItem *aItem; QModelIndex index; for (int i=0;i<rowCount;i++) { aStream>>ceShen;//读取测深, qint16 index=theModel->index(i,0); aItem=theModel->itemFromIndex(index); aItem->setData(ceShen,Qt::DisplayRole); aStream>>chuiShen;//垂深,qreal index=theModel->index(i,1); aItem=theModel->itemFromIndex(index); aItem->setData(chuiShen,Qt::DisplayRole); aStream>>fangWei;//方位,qreal index=theModel->index(i,2); aItem=theModel->itemFromIndex(index); aItem->setData(fangWei,Qt::DisplayRole); aStream>>weiYi;//位移,qreal index=theModel->index(i,3); aItem=theModel->itemFromIndex(index); aItem->setData(weiYi,Qt::DisplayRole); aStream>>zhiLiang;//固井质量,QString index=theModel->index(i,4); aItem=theModel->itemFromIndex(index); aItem->setData(zhiLiang,Qt::DisplayRole); aStream>>quYang;//bool index=theModel->index(i,5); aItem=theModel->itemFromIndex(index); if (quYang) aItem->setCheckState(Qt::Checked); else aItem->setCheckState(Qt::Unchecked); } aFile.close(); return true; } bool MainWindow::saveBinaryFile(QString &aFileName) { //保存为纯二进制文件 QFile aFile(aFileName); //以文件方式读出 if (!(aFile.open(QIODevice::WriteOnly))) return false; QDataStream aStream(&aFile); //用文本流读取文件 // aStream.setVersion(QDataStream::Qt_5_9); //无需设置数据流的版本 aStream.setByteOrder(QDataStream::LittleEndian);//windows平台 // aStream.setByteOrder(QDataStream::BigEndian);//QDataStream::LittleEndian qint16 rowCount=theModel->rowCount(); qint16 colCount=theModel->columnCount(); aStream.writeRawData((char *)&rowCount,sizeof(qint16)); //写入文件流 aStream.writeRawData((char *)&colCount,sizeof(qint16));//写入文件流 //获取表头文字 // QString str; QByteArray btArray; QStandardItem *aItem; for (int i=0;i<theModel->columnCount();i++) { aItem=theModel->horizontalHeaderItem(i); //获取表头item QString str=aItem->text(); //获取表头文字 btArray=str.toUtf8(); //转换为字符数组 aStream.writeBytes(btArray,btArray.length()); //写入文件流,长度uint型，然后是字符串内容 } //获取数据区文字， // qint16 ceShen; // qreal chuiShen; // qreal fangWei; // qreal weiYi; // QString zhiLiang; // bool quYang; qint8 yes=1,no=0; //分别代表逻辑值 true和false for (int i=0;i<theModel->rowCount();i++) { aItem=theModel->item(i,0); //测深 qint16 ceShen=aItem->data(Qt::DisplayRole).toInt();//qint16类型 aStream.writeRawData((char *)&ceShen,sizeof(qint16));//写入文件流 aItem=theModel->item(i,1); //垂深 qreal chuiShen=aItem->data(Qt::DisplayRole).toFloat();//qreal 类型 aStream.writeRawData((char *)&chuiShen,sizeof(qreal));//写入文件流 aItem=theModel->item(i,2); //方位 qreal fangWei=aItem->data(Qt::DisplayRole).toFloat(); aStream.writeRawData((char *)&fangWei,sizeof(qreal)); aItem=theModel->item(i,3); //位移 qreal weiYi=aItem->data(Qt::DisplayRole).toFloat(); aStream.writeRawData((char *)&weiYi,sizeof(qreal)); aItem=theModel->item(i,4); //固井质量 QString zhiLiang=aItem->data(Qt::DisplayRole).toString(); btArray=zhiLiang.toUtf8(); aStream.writeBytes(btArray,btArray.length()); //写入长度,uint，然后是字符串 //