I have one Union like below
#define no_of_bits 240
#define word_size 16
struct bits
{
unsigned short int bit1:1;
unsigned short int bit2:1;
unsigned short int bit3:1;
unsigned short int bit4:1;
unsigned short int bit5:1;
unsigned short int bit6:1;
unsigned short int bit7:1;
unsigned short int bit8:1;
unsigned short int bit9:1;
unsigned short int bit10:1;
unsigned short int bit11:1;
unsigned short int bit12:1;
unsigned short int bit13:1;
unsigned short int bit14:1;
unsigned short int bit15:1;
unsigned short int bit16:1;
};
union myData
{
unsigned short int data[no_of_bits/word_size];
struct bits word[no_of_bits/word_size];
};
I want to convert myData
union into a QByteArray
so that I can send it through socket using QUdpSocket
using writeDatagram()
function.
So first tell me how can I convert this into QByteArray
.
Next thing is that, On the receiver side how can I convert the QByteArray
into the this Union myData
again.
Use QByteArray
constructor or QByteArray::fromRawData
.
See example for converting to QByteArray:
#include <QCoreApplication>
#include <QByteArray>
#define no_of_bits 240
#define word_size 16
struct bits
{
unsigned short int bit1:1;
unsigned short int bit2:1;
unsigned short int bit3:1;
unsigned short int bit4:1;
unsigned short int bit5:1;
unsigned short int bit6:1;
unsigned short int bit7:1;
unsigned short int bit8:1;
unsigned short int bit9:1;
unsigned short int bit10:1;
unsigned short int bit11:1;
unsigned short int bit12:1;
unsigned short int bit13:1;
unsigned short int bit14:1;
unsigned short int bit15:1;
unsigned short int bit16:1;
};
union myData
{
unsigned short int data[no_of_bits/word_size];
struct bits word[no_of_bits/word_size];
};
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
myData data;
// Variant 1 (no copy data)
auto byteArray = QByteArray::fromRawData(reinterpret_cast<const char*>(&data), sizeof(data));
// Variant 2 (copy data)
QByteArray byteArray2(reinterpret_cast<const char*>(&data), sizeof(data));
return a.exec();
}
Convert from QByteArray:
assert(byteArray.size() == sizeof(data));
memcpy(&data, byteArray.data(), sizeof(data)); // Copy
// OR
assert(byteArray.size() == sizeof(data));
myData* data2 = reinterpret_cast<myData*>(byteArray.data()); // No copy
Actually, you can call writeDatagram
directly:
QUdpSocket socket;
socket.writeDatagram(reinterpret_cast<const char*>(&data), sizeof(data), QHostAddress("127.0.0.1"), 1234);