使用QScriptEngine在arg中传递QByteArray

Question

我会试着用QScriptEngine写函数来读数组，写数组来改变Trame，例如和qtscript用户。我已经阅读了很多文档。

我将尝试这样做:目前，我的软件中有QByteArray，通过脚本检查trameProtocol。

QByteArray l_ByteArray ="01";
QVariant l_varByteArray = l_ByteArray;
QScriptValue l_var = m_engine.newVariant(l_varByteArray);
QScriptValue m_fct_checksum = m_engine.evaluate("( \n function cal_crc(pTrame) \n { return pTrame[0]; \n } \n)");
qDebug() << m_fct_checksum.call(QScriptValue(),l_var).toInteger();
/* works  can read if i return element of array, but not can t modify by script , not have properti length in script not work
if call with newArray(), not have to access to property length */

我不明白我会写像这样的https://doc.qt.io/archives/qt-4.8/qt-script-customclass-example.html自定义类

或者我有自动转换不工作？

其他测试：

"( \n function cal_crc(pTrame) \n { return pTrame.length; \n } \n)"

QScriptValue l_var = m_engine.newArray(2);
l_var.setProperty( 0,QScriptValue('0') );
l_var.setProperty( 1,QScriptValue('1') );
qDebug() << l_var.toVariant();
qDebug() << m_fct_checksum.call(QScriptValue(),l_var).toInteger();

//console
QVariant(QVariantList, (QVariant(int, 48), QVariant(int, 49)))
0
like writing previously, don't modify pTrame in script
    ("(function cal_crc(pTrame){pTrame[0]=5;return pTrame[0];})");
   //same result
   QVariant(QVariantList, (QVariant(int, 48), QVariant(int, 49)))
    0 //not 5

如果我在脚本中返回pTrame：

  "(function cal_crc(pTrame){pTrame[0]=5;return pTrame;})"
   qDebug() << m_fct_checksum.call(QScriptValue(),l_var).toVariant();
   QVariant(QVariantList, (QVariant(int, 48), QVariant(int, 49)))
    QVariant(int, 48)

或

 "function cal_crc(pTrame){return pTrame})"
  QVariant(QVariantList, (QVariant(int, 48), QVariant(int, 49)))
  QVariant(int, 48)
//return only the first,, it's strange because en i work in arg but not in return and can't modify i repeat..

有什么想法吗？

谢谢

Answer 1

如果我在arg //中注册pTrame是正常的，并且不使用该脚本：

 "(function(){pTrame[0]=5;return pTrame})"

QScriptValue l_var = m_engine.newArray(2);
  l_var.setProperty( 0,QScriptValue('0') );
  l_var.setProperty( 1,QScriptValue('1') );
 m_engine.globalObject().setProperty("pTrame", l_var);


//console
QVariant(QVariantList, (QVariant(int, 48), QVariant(int, 49)))
QVariant(QVariantList, (QVariant(int, 5), QVariant(int, 49)))

有没有办法做得更好？