Read up on integers and how they
are stored in memory http://en.wikipedia.org/wiki/Endianness
Try this
int data =
"">
tcp_write(pcb,
data, 4, 1); // I changed the 1 to a 4
tcp_output(pcb);
and see what you get in wireshark. You'll probably get
00 FF xx xx (where xx is don't care garbage since you have a
big endian 16-bit architecture)
or
00 00 00 FF
(since you have a 32 bit bit endian architecture)
-Mark
On 12/5/2012 6:38 AM, Firedog I.
wrote:
Hi everyone,
I got a
little problem over here. I can send simple TCP-Data like
string and char, but I can’t send data as integer type.
I’m using lwIP v1.36 with RAW API.
Example:
/*Connection
to Client established…*/
int data =
"" //or int data = "">
tcp_write(pcb,
data, 1, 1);
tcp_output(pcb);
When sending
this Packet out, I receive a “00” as data in Wireshark.
I’ve tried
sending out the equal ASCII-char to 255, a “ÿ“ (see extended ASCII), and this
one works. When sending out this char, Wireshark shows a
TCP-Packet with 1 byte length and a "ff" as data. That’s
exactly what I want, but I don’t want to convert integer
vars into extended ascii and then send the converted data
out.
Any
suggestions how to solve the problem?
Thanks.
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