//文件时间比对

bool mtime_compare(QString ser_file, QString local_file)

{

    QFileInfo fileInfo_local(local_file);

    QFileInfo fileInfo_server(ser_file);

    if(fileInfo_local.exists() && fileInfo_server.exists())

    {

        QDateTime local_file_time = fileInfo_local.lastModified(); //获取文件修改时间

        QString local_QString = local_file_time.toString("yyyyMMddhhmmss");

        QDateTime server_file_time = fileInfo_server.lastModified(); //获取文件修改时间

        QString server_QString = server_file_time.toString("yyyyMMddhhmmss");

        long long local_time = local_QString.toLongLong();    //数字太大不能用int

        long long server_time = server_QString.toLongLong();

        if(server_time > local_time)

        {

            return true;

        }

        else

        {

            return false;

        }

    }

    else 

    {

        return false;

    }

}