Making and sending a mix double and int array in c

Question

I am trying to send a msg from a socket that will be in the form on

double,int,int,int,int,...,int

N int values how can i send it? i have opened a socket but how can i put all those elements in one array that will be sent in:

status=sendto(SendSocket,msg,sizeof(double)+N*sizeof(int),
0,(void*)&out_socketaddr,sizeof(out_socketaddr));

Where MSG is the memory(array) of all those elements and out_socketaddr is the destination

Lundin · Accepted Answer · 2015-05-12 10:47:30Z

2

uint8_t array [sizeof(this) + sizeof(that) + ...];
uint8_t* ptr = array;

memcpy(ptr, &this, sizeof(this));
ptr+=sizeof(this);
memcpy(ptr, &that, sizeof(that));
ptr+=sizeof(that);
...

Avoid making a struct. Although structs will make the code more readable, they also introduce padding, which will be an issue in this case.

answered May 12, 2015 at 10:47

Lundin

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3 Comments

JohnnyF Over a year ago

great, i thought it should be something like that, but i tried with woid and it didnt work, ty

JohnnyF Over a year ago

will it make difrrence if it will be of type char?

Lundin Over a year ago

@JohnnyF The raw data should be uint8_t, it doesn't make any sense to represent it as anything else. The char type has implementation-defined signedness, so it shouldn't be used for storing raw data.

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