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  • qt开发杂记

    1.利用正则表达式拆分字符串

      QString str = "[ 1920 , 1080^22/33*55 ]";
      QStringList sl = str.mid( 1, str.size() - 2 ).split( QRegExp( "[,*/^]" ) );
      qDebug() << sl.first(); //第一个数字
      qDebug() << sl.last(); //第二个数字

    2.toPointF()使用

    #include <QVariant>
    #include <QPointF>
      QPointF nn( 1.0, 2.0 );
      QVariant ss( nn );
      QPointF aa = ss.toPointF();
      double zx = aa.rx();
      double zz = aa.ry();

    3.Qt写文件

    #include <QCoreApplication>
    #include<QFile>
    #include <QDir>
    #include <QTextStream>
    
    int main( int argc, char* argv[] )
    {
      QCoreApplication a( argc, argv );
      const QString& robotDir = QString( "C:/Users/zhangxiangbz/Desktop/untitled/" );
      QString m_infoFile = QString( "%1/station_list.ini" ).arg( robotDir );
      QDir roboDir( robotDir );
      if ( !roboDir.exists() )
      {
        roboDir.mkpath( robotDir );
      }
      else
      {
        int i = 1;
        QString b = QString( "%1" ).arg( i, 3, 10, QChar( '0' ) );//整形数据用0补全   001
        double L = 1.0;
        QString c = QString::number( L, 'f', 2 );//位数控制
        double x = 3.1, y = 2.2, z = 3.14;
        int id = 2;
        QString str = QString( "id:%1 pose:[%2, %3, %4]" ).arg( id ).arg( c ).arg( y ).arg( z );
        QFile infoFile( m_infoFile );
        if ( infoFile.open( QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text ) )//插入文件末尾
        {
          QTextStream out( &infoFile );
          out << str << "
    ";//每次写入数据换行
        }
        infoFile.close();
      }
    }





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  • 原文地址:https://www.cnblogs.com/zx-hit/p/12881105.html
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