Qt 调用 linux echo命令不能执行

Question

QString str = QString("echo %1 > /sys/class/backlight/*/brightness").arg(brightness);
int exitCore = QProcess::execute(str);

    返回值 -2 

    QByteArray byteArray = str.toLatin1();
const char *command= byteArray.data();
qDebug() << "command:" << command;
int ret = system(command);
    返回值 -1 

    怎么解决呢

Answer 1

= QProcess::execute(str);
返回值 -2

QByteArray byteArray = str.toLatin1();

const char *command= byteArray.data();
qDebug() << "command:" << command;
int ret = system(command);
返回值 -1