Function from C# to C++ via Qt lib - qt

Question

Could you tell me how these function from C# can be re-written to C++ via Qt lib?
private MemoryStream _memoryStream= new MemoryStream();
//WriteUTFBytes
public void WriteUTFBytes(string value)
{
//Length - max 65536.
UTF8Encoding utf8Encoding = new UTF8Encoding();
byte[] buffer = utf8Encoding.GetBytes(value);
if (buffer.Length > 0)
WriteBytes(buffer);
}
//WriteBytes
public void WriteBytes(byte[] buffer)
{
for (int i = 0; buffer != null && i < buffer.Length; i++)
_memoryStream.WriteByte(buffer[i]);
}
//WriteByte
public void WriteByte(int value)
{
_memoryStream.WriteByte((byte)value);
}
//WriteShort
public void WriteShort(int value)
{
byte[] bytes = BitConverter.GetBytes((ushort)value);
WriteBigEndian(bytes);
}
//WriteBigEndian
private void WriteBigEndian(byte[] bytes)
{
if (bytes == null)
return;
for (int i = bytes.Length - 1; i >= 0; i--)
{
_memoryStream.WriteByte(bytes[i]);
}
}

Answer 1

private:
QBuffer _buffer;
public:
YourClass()
{
_buffer.open(QIODevice::WriteOnly);
}
void writeUtfBytes(const QString &value)
{
QTextStream ts(&_buffer);
ts.setCodec("UTF-8");
ts << value;
}
void writeBytes(const char *data, int size)
{
if (data)
_buffer.write(data, size);
}
void writeByte(int value)
{
_buffer.putChar(value);
}
void writeShort(int value)
{
_buffer.putChar(value >> 8);
_buffer.putChar((char) value);
}