QByteArray processing (seeking equivalent QT code)

[pdoria]

Hi,

Could someone please tell me the C++/Qt4 equivalent of this?

PHP CODE

$input_250="432345566180632659";
 
$input_Value=array();
 
      //250 IN29
      $dec = $input_250;
      $byte = 8;
      for($i=0;$i<$byte;$i++)
      {
        if($i>0)
        {
          $input_Value[$i] = gmp_mod(gmp_div_q($dec,gmp_pow(2, $i*8)),256);
        }
        else
        {
          $input_Value[$i] = gmp_mod($dec,256);
        }
      }

$input_250="432345566180632659";

$input_Value=array();

      //250 IN29
      $dec = $input_250;
      $byte = 8;
      for($i=0;$i<$byte;$i++)
      {
        if($i>0)
        {
          $input_Value[$i] = gmp_mod(gmp_div_q($dec,gmp_pow(2, $i*8)),256);
        }
        else
        {
          $input_Value[$i] = gmp_mod($dec,256);
        }
      }

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I'm storing the $input_250 in Qt in a QByteArray.
This number is represented as a longlong .

Any help would surely be appreciated!

BR,
Pedro Doria Meunier

[ChrisW67]

If I'm reading that right then you are trying to break a 64-bit integer value into a series of bytes.

// close to the original
quint64 input250 = Q_UINT64_C(2314885536612049221);
QByteArray inputValue(sizeof(input250), 0);    // bytes of zero
int i = 0;
quint64 work = input250;
while (work) {        // only does as many loops as needed.
    inputValue[i++] = work & 0xff;
    work = work >> 8;
}
qDebug() << input250 << inputValue;
 
// You might get away with this but beware byte order issues
QByteArray ba = QByteArray::fromRawData((char *)&input250, sizeof(input250));
qDebug() << input250 << ba;

// close to the original
quint64 input250 = Q_UINT64_C(2314885536612049221);
QByteArray inputValue(sizeof(input250), 0);    // bytes of zero
int i = 0;
quint64 work = input250;
while (work) {        // only does as many loops as needed.
    inputValue[i++] = work & 0xff;
    work = work >> 8;
}
qDebug() << input250 << inputValue;

// You might get away with this but beware byte order issues
QByteArray ba = QByteArray::fromRawData((char *)&input250, sizeof(input250));
qDebug() << input250 << ba;

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[pdoria]

Chris,

Either approach works perfectly.

Many, many thanks!

BR,
Pedro Doria Meunier