CODEWITHSUNDEEP
c++
kidz55
kidz55

Reputation: 315

How to insert a buffer in a ostream with c++

What i'm trying to do is to insert into a stream ( std::ostream ) a buffer .

this buffer is an attribute of my class "AcquiSample"

I made this example very simple for you to understand my problem.

here the definition of the class :

class AcquiSample
{
  public:
    IQSample * buffer;
}

here's the definition of the struct IQSample :

struct IQSample {
 struct {
    short val;
 }I;
struct {
    short val;
 }Q;
}

what I want to do is put this buffer with the known size into a stream like that:

std::ostream stream;
AcquiSample obj;
stream << obj.buffer->I.val << obj.buffer->I.val;

I think it's not working because it's not copying the data but the pointer adress, what i want is to put the entire buffer into this stream because i'm sending this stream on another computer.

If anyone know how to do this i'd be very thankful.

Upvotes: 0

Views: 1252

Answers (2)

Fredrik E
Fredrik E

Reputation: 1840

Perhaps something like this is what you are looking for?

std::ostream& operator<<(std::ostream& os, const AcquiSample & sample)
{
    //Deserialize your object here, or create methods in AcquiSample for serialization and deserialization.
    os << sample.buffer->I.val;
    os << sample.buffer->Q.val;
    return os;
}

int main(int argc, char **argv) {
    std::ostream stream; // Don't forget to initialize the stream.
    AcquiSample obj; // Don't forget to set buffer to something!
    stream << obj;
}

Upvotes: 1

Columbo
Columbo

Reputation: 60989

The most idiomatic way to achieve this is to overload the insertion operator:

struct IQSample {
 struct {
    short val;
 }I;
struct {
    short val;
 }Q;
};

std::ostream& operator<<( std::ostream& os, IQSample iqs )
{
    return os << iqs.I.val << ' ' << iqs.Q.val; // Don't forget to put white spaces between the numbers!
}

std::istream& operator>>( std::istream& os, IQSample& iqs )
{
    return is >> iqs.I.val >> iqs.Q.val;
}

And now

std::ostream stream; // some stream bound to a streambuf who transfers over network
AcquiSample obj;
stream << *obj.buffer;

Upvotes: 2

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