(){ qDebug() << "update"; if(!filepath.isNull()) {//初始QFile* file = new
2022-03-28 14:56
问题描述及复现步骤:MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow){ui->setupUi(this);// file.setFileName("/home/firefly/123");file.setFileName("/sys/class/leds/firefly:yellow:user/brightness");// system("echo none > /sys/class/leds/firefly:yellow:user/trigger");}MainWindow::~MainWindow(){delete ui;}void MainWindow::on_pushButton_clicked(bool checked){qDebug()<<checked<<endl;if(!file.exists()){qDebug()<<"no led"<<endl;return ;}if(!file.open(QIODevice::WriteOnly))qDebug()<<file.errorString()<<endl;QByteArray buf[] = {"0","1"};if(checked){ui->pushButton->setText("close");qDebug()<<"close"<<endl; file.write(buf[1]);}else{ui->pushButton->setText("open");qDebug()<<"open"<<endl;file.write(buf[0]);}file.close();}在终端上 打开文件提示permission denied尝试 chmod 777没有用请问是什么问题呢
2022-11-17 16:31
基于Linux的Qt图形化MP3播放器有哪些模块组成？如何去实现一种基于Linux的Qt图形化MP3播放器的设计？
2021-12-23 09:48
