QT 读写文件 create_file read_file del_file

一时失言乱红尘 2022-06-13 11:41 232阅读 0赞

创建文件 //create\_file(QString str)  
str 写到文件里面

void MainWindow::create_file(QString str)
    {
    
        QString AppPath = QApplication::applicationFilePath();
        qDebug() << "AppPath:" << AppPath;
    
        QString  openssl_path_dir = AppPath;
        openssl_path_dir = openssl_path_dir.replace(QString("cmd_openssl.exe"), QString("openssl/bin/"));
        qDebug() << "openssl_path_dir:" << openssl_path_dir;
    
        QString fileName=openssl_path_dir + "psw_tmp.txt";
        qDebug() << "fileName:" << fileName;
        glb_psw_tmp_file_path = fileName;
        QFile f(fileName);
    
        if(!f.open(QIODevice::WriteOnly | QIODevice::Text))
        {
            qDebug()  << "Open failed.";
            QMessageBox::warning(this,"file error","can't open",QMessageBox::Yes);
        }
    
        QTextStream in(&f);
        in << str;//没有回车
        in << str << endl;//有回车
        f.close();
    }
    /* AppPath: "E:/Qt/leo_qt/build-cmd_openssl-Desktop_Qt_5_8_0_MinGW_32bit-Release/release/cmd_openssl.exe" openssl_path_dir: "E:/Qt/leo_qt/build-cmd_openssl-Desktop_Qt_5_8_0_MinGW_32bit-Release/release/openssl/bin/" fileName: "E:/Qt/leo_qt/build-cmd_openssl-Desktop_Qt_5_8_0_MinGW_32bit-Release/release/openssl/bin/psw_tmp.txt" */

--------------------

读文件 read\_file(QString file\_path)

QString MainWindow::read_file(QString file_path)
    {
        QFile f(file_path);
        if(!f.open(QIODevice::ReadOnly | QIODevice::Text))
        {
            qDebug()  << "Open failed.";
            QMessageBox::warning(this,"sdf","can't open",QMessageBox::Yes);
        }
    
        QTextStream txtOutput(&f);
        QString lineStr;
        QString all_line_str;
        while(!txtOutput.atEnd())
        {
            lineStr = txtOutput.readLine();
            all_line_str += lineStr;
           // cout << lineStr << endl;
            qDebug()  << "lineStr:" << lineStr;
        }
        qDebug()  << "all_lineStr:" << all_line_str;
    
        qDebug()  << file_path;
        f.close();
       // f.remove(file_path);
        return all_line_str;
    }

--------------------

//删除临时文件

QString fileName=glb_psw_tmp_file_path;
        QFile file;
        file.remove(fileName);