Qt QProcess备份数据库，目前文件与空格

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1.先说明下system调用mysql备份函数时的情况

成功===

"E:/Program Files/mysql-5.7.11-winx64/bin/mysqldump" -uroot hddpos > D://mnt/usb/sql-2017081617323.sql

失败===

"E:/Program Files/mysql-5.7.11-winx64/bin/mysqldump" -uroot hddpos > "D://mnt/usb/sql-2017081617323.sql"

失败===

"E:/Program Files/mysql-5.7.11-winx64/bin/mysqldump" -uroot hddpos > D:/Program Files/SoftPos/fastfd_localdata/sql_backup_dir/xxx.sql

失败===

"E:/Program Files/mysql-5.7.11-winx64/bin/mysqldump" -uroot hddpos > D:/Program Files/SoftPos/fastfd_localdata/sql_backup_dir/xxx.sql

后来

QString Cmd = QString("E:/Program Files/mysql-5.7.11-winx64/bin/mysqldump.exe -uroot hddpos");

    QString Path = QString("%1").arg("D:/Program Files/SoftPos/fastfd_localdata/sql_backup_dir/xxx.sql");
    QProcess *poc=new QProcess;
    poc->setStandardOutputFile(Path);
    poc->start(Cmd);
    qDebug() << __LINE__;
    qDebug() << __LINE__ <<poc->waitForFinished();
    qDebug() << __LINE__ << poc->errorString();

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