Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

roscpp - Convert uint8[] into a known struct

roscpp

asked 2013-08-12 11:38:56 -0600

Hendrik Wiese

1137 ●77 ●90 ●104

Hi folks,

I've got a universal message type for all kinds of data that comes in through a UDP socket. This message just contains a fixed size array of uint8[16].

What I would like to do is to convert the uint8 array into a pre-defined struct. I know what the struct has to look like so if I just had a usual C array of chars I'd just do a cast. But IIRC that doesn't work with a uint8[] since it is a more complex type of array.

So how do I do that? How do I kind of unmarshall that uint8 array into a struct?

Thanks a lot!

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2013-08-12 12:02:52 -0600

Hendrik Wiese

1137 ●77 ●90 ●104

Got it working. It's really just as simple as

typedef struct {
  char a;
  float b;
  char c;
} stc;

And later...

stc* d = (stc*)&msg.data;

Since the other side of the line does packing and converting endianness I had to take care of having all the uint8 in the right place before doing this.

It's working. Thanks anyway!

edit flag offensive delete link

add a comment

Question Tools

1 follower

Stats

Asked: 2013-08-12 11:38:56 -0600

Seen: 790 times

Last updated: Aug 12 '13

roscpp - Convert uint8[] into a known struct edit

1 Answer

Question Tools

Stats

Related questions

roscpp - Convert uint8[] into a known struct