Casting double to bytes

Ariesnl

When I need to serialize a double to a byte stream and vice versa I use these functions in C ( and C++)

#SelectExpand
  1DoubleToBytes(double a_dDouble)
  2{
  3  std::vector<uint8_t> vResult;
  4  const unsigned char *pBtyeArray = reinterpret_cast<const unsigned char*>(&a_dDouble);
  5  const unsigned char *pBtyeArrayEnd = pBtyeArray + sizeof(double) -1;
  6
  7  for (; pBtyeArray <= pBtyeArrayEnd; pBtyeArray++)
  8  {
  9    unsigned char b = *pBtyeArray;
 10
 11
 12    vResult.push_back(*pBtyeArray);
 13  }
 14
 15  return vResult;
 16}
 17
 18BytesToDouble(std::vector<uint8_t> a_zByteArray)
 19{
 20  double dNumber;
 21  memcpy(&dNumber, a_zByteArray.data(), sizeof(double));
 22  return dNumber;
 23}

This works great as long as sender and receiver are programmed in C or C++.
However, in my case right now the receiving end is programmed in C#...::)
And I have a hard time converting the byte array to double again.
Nothing seems to work...

Any Ideas ?

Dizzy Egg

In C# you would just use the BitConverter

#SelectExpand
  1  public byte[] ConvertDoubleToByteArray(double d)
  2
  3    {
  4
  5        return BitConverter.GetBytes(d);
  6
  7    }
  8
  9    public double ConvertByteArrayToDouble(byte[] b)
 10
 11    {
 12
 13        return BitConverter.ToDouble(b, 0);
 14
 15    }

Edgar Reynaldo

You're forgetting endianness of the machines.

Thread #618459. Printed from Allegro.cc