QString FullPathRY_UserParaData = "E:\\abc.dat";
    string filepath = FullPathRY_UserParaData.toStdString();[存在问题]
    string file2 = "E:\\abc.dat";

 
    QByteArray byteArray = FullPathRY_UserParaData.toUtf8();
    std::string filePathstr(byteArray.constData(), byteArray.length());