qt 16进制字符串 转换为 二进制 字节流

代码:

#include <QMainWindow>

#include <QUdpSocket>

#include <QCoreApplication>
#include <QDebug>
#include <QDataStream>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->ip_lineEdit->setText("192.168.99.219");
    ui->port_lineEdit->setText("60000");
    ui->wsd_lineEdit->setText("FEDC1003173CD922033DFC8400100000012F000001DE0000001600000E26CD41");
    ui->sj_lineEdit->setText("FEDC1003173CD921BA93A835000C000000010000000A00000E1395C1");

    ui->connect_btn->setEnabled(true);
    ui->disconnect_btn->setEnabled(false);
    ui->sj_pushButton->setEnabled(false);
    ui->wsd_pushButton->setEnabled(false);
    ui->ip_lineEdit->setEnabled(true);
    ui->port_lineEdit->setEnabled(true);
}
void MainWindow::on_sj_pushButton_clicked()
{
    QString ip_dest;
    ip_dest = ui->ip_lineEdit->text();

    qint16 port_dest = ui->port_lineEdit->text().toInt();

    QString contentStr = ui->sj_lineEdit->text();


    QByteArray ba = QByteArray::fromHex(contentStr.toLocal8Bit());

    udpSocket->writeDatagram(ba, QHostAddress(ip_dest), port_dest);
}