sqlite database

#include "wavesd.h"

#include "ui_wavesd.h"

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#include

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_WaveData_ wavedata;

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WaveSD::WaveSD(QWidget *parent) :

QWidget(parent),

ui(new Ui::WaveSD)

{

ui->setupUi(this);

}

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WaveSD::~WaveSD()

{

delete ui;

}

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void WaveSD::on_pushButton_clicked()

{

QString fileName=QFileDialog::getOpenFileName(this,QStringLiteral("请选择一个文件"),\

QDir::currentPath(),QStringLiteral(".h文件(*.h);;所有文件(*.*)"));

if(fileName.isEmpty())

return;

QFile aFile(fileName);

if(!aFile.open(QIODevice::ReadOnly|QIODevice::Text))

return;

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ui->plainTextEdit->appendPlainText(QStringLiteral("文件大小：")+QString::number(aFile.size())+"\n");

ui->plainTextEdit->appendPlainText(QStringLiteral("文件访问权限：")+QString::number(aFile.permissions(),16)+"\n");

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//    QFile file("image.jpg");

//    QFileInfo info(file);//获取文件的信息

QFileInfo info(aFile);//获取文件的信息

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qDebug() << QStringLiteral("路径") << info.absoluteFilePath()

<< QStringLiteral("大小") << info.size();

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aFile.close();

}

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void WaveSD::on_pushButton_2_clicked()

{

//    QFile file("image.jpg");

//    QFileInfo info(file);//获取文件的信息

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//    qDebug() << QStringLiteral("路径") << info.absoluteFilePath()

//             << QStringLiteral("大小") << info.size();

//    file.close();

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QString oldFileName=QFileDialog::getOpenFileName(this,QStringLiteral("请选择一个文件"),\

QDir::currentPath(),QStringLiteral(".h文件(*.h);;所有文件(*.*)"));

if(oldFileName.isEmpty())

return;

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QFileInfo fileInfo(oldFileName);

QString newFileName=fileInfo.path()+"/"+fileInfo.baseName()+".XYZ"; //设置新文件名称

QFile::rename(oldFileName,newFileName); //改名

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ui->plainTextEdit->appendPlainText(QStringLiteral("源文件名为：")+oldFileName+"\n");

ui->plainTextEdit->appendPlainText(QStringLiteral("重命名为：")+newFileName);

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}

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void WaveSD::on_pushButton_3_clicked()

{

//过滤器的使用

//    QDir mDir(QDir::current());

//    QStringList filters;

//    filters<
//    mDir.setNameFilters(filters);  //设置过滤器
//    qDebug()<


//    QDir dir("E:\QT");
    QDir dir(QDir::current());


    foreach (QFileInfo mItem,dir.entryInfoList())//遍历路径下的每一项
    {
 
        if(mItem.isDir())//如果是文件夹
        {
 
            qDebug() << " Dir " << mItem.filePath();  //打印路径
        }
        else//如果不是文件夹
        {
 
            qDebug() << "File" << mItem.filePath();
        }
    }


    ui->plainTextEdit->appendPlainText(QStringLiteral("临时文件目录名称：")+QDir::tempPath()+"\n");
        ui->plainTextEdit->appendPlainText(QStringLiteral("根目录名称：")+QDir::rootPath()+"\n");
        ui->plainTextEdit->appendPlainText(QStringLiteral("主目录名称：")+QDir::homePath()+"\n");
        ui->plainTextEdit->appendPlainText(QStringLiteral("当前目录名称：")+QDir::currentPath()+"\n");

}

void WaveSD::on_pushButton_4_clicked()
{
 
    QString fileName=QFileDialog::getOpenFileName(this,QStringLiteral("请选择一个文件"),QDir::currentPath());
       if(fileName.isEmpty())
           return;

       ui->lineEdit->setText(fileName);
}

void WaveSD::on_pushButton_5_clicked()
{
 
    QString dirName=QFileDialog::getExistingDirectory(this,QStringLiteral("选择一个目录"),QDir::currentPath());
        if(dirName.isEmpty())
            return;

        ui->lineEdit_2->setText(dirName);
}

void WaveSD::on_pushButton_6_clicked()
{
 
    //添加监听对象
        fileWathcer.addPath(ui->lineEdit->text());
        fileWathcer.addPath(ui->lineEdit_2->text());

        //绑定信号与槽
        QObject::connect(&fileWathcer,SIGNAL(directoryChanged(const QString path)),this,SLOT(on_directoryChanged(const QString path)));
        QObject::connect(&fileWathcer,SIGNAL(fileChanged(const QString path)),this,SLOT(on_fileChanged(const QString path)));
}

void WaveSD::on_pushButton_7_clicked()
{
 
    //解除监听对象
        fileWathcer.removePath(ui->lineEdit->text());
        fileWathcer.removePath(ui->lineEdit_2->text());

        //解除信号与槽
        QObject::connect(&fileWathcer,&QFileSystemWatcher::directoryChanged,this,&WaveSD::on_directoryChanged);
        QObject::connect(&fileWathcer,&QFileSystemWatcher::fileChanged,this,&WaveSD::on_fileChanged);
}

void WaveSD::on_fileChanged(const QString path)
{
 
    ui->plainTextEdit->appendPlainText(path);
    ui->plainTextEdit->appendPlainText(QStringLiteral("文件发生了变化"));
}

void WaveSD::on_directoryChanged(const QString path)
{
 
    ui->plainTextEdit->appendPlainText(path);
    ui->plainTextEdit->appendPlainText(QStringLiteral("目录发生了变化"));
}


void WaveSD::on_pushButton_8_clicked()
{
 


    QString fileName=QFileDialog::getOpenFileName(this,QStringLiteral("请选择一个文件"),\
                                      QDir::currentPath(),QStringLiteral(".h文件(*.h);;所有文件(*.*)"));
    if(fileName.isEmpty())
        return;
    QFile file(fileName);
//    if(!file.open(QIODevice::ReadOnly|QIODevice::Text))
//        return;



//    QFile file("test.txt");                                        //打开文件test.txt
       QVectorarray;                                           //vector矢量，建立一个数组array
       if(file.open(QIODevice::ReadOnly|QIODevice::Text))                             // 以只读方式打开文件
       {
 
          QTextStream ts(&file);                                      //利用QTextStream流读取file，ts通过指针访问file
          while(!file.atEnd())                                        //文件未读完时
           {
 
               float buf;                                             //定义float类型数据buf
               QStringList list=ts.readAll().split(QRegExp("\\s+"));  //利用QStringList读取所有内容，split分割内容，有多种分割样式
               QListIteratorli(list);                        //起到定位列表内字符初始位置的作用
               while(li.hasNext())                                    //hasNext当读取未进行到末尾时，返回true，故可以在未到末尾时一直读取
               {
 
                   buf=li.next().toFloat();                           //next的作用是读取下一个值并向下跳转位置
                   array.append(buf);                                 //append追加，等同于list.insert(size(), value)的作用，添加内容
               }
           }
       }
       ui->lineEdit->setText(QString::number(array[0]));              //将数组array中的第1个数据显示到第一个lineedit上
       ui->lineEdit_2->setText(QString::number(array[2]));





}


void WaveSD::on_pushButton_9_clicked()
{
 



    //指定该连接使用的数据库驱动，没有设置第二个参数即为默认连接
    QSqlDatabase db=QSqlDatabase::addDatabase("QSQL
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Original: https://blog.csdn.net/weixin_40447738/article/details/122554135
Author: weixin_40447738
Title: sqlite database