Serialization examples
Integer of value 1
q)-8!1i
0x010000000d000000fa01000000
| bytes |
semantics |
| 0x01 |
architecture used for encoding the message, big endian (0) or little endian (1) |
| 00 |
message type (0 – async, 1 – sync, 2 – response) |
| 0000 |
|
| 0d000000 |
msg length (13) |
| fa |
type of item following (-6, meaning a 4-byte integer follows) |
| 01000000 |
the 4-byte int value (1) |
Integer vector
q)-8!enlist 1i
0x010000001200000006000100000001000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 12000000 |
message length |
| 06 |
type (int vector) |
| 00 |
attributes (00 – none, 01 – s, 02 – u, 03 – p, 04 – g) |
| 01000000 |
vector length (1) |
| 01000000 |
the item, a 4 byte integer (1) |
Byte vector
q)-8!`byte$til 5
0x01000000130000000400050000000001020304
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 13000000 |
message length |
| 04 |
type (byte vector) |
| 00 |
attributes |
| 05000000 |
vector length (5) |
| 0001020304 |
the 5 bytes |
General list
q)-8!`byte$enlist til 5
0x01000000190000000000010000000400050000000001020304
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 19000000 |
message length |
| 00 |
type (list) |
| 00 |
attributes |
| 01000000 |
list length (1) |
| 04 |
type (byte vector) |
| 00 |
attributes |
| 05000000 |
vector length (5) |
| 0001020304 |
the 5 bytes |
Dictionary with atom values
q)-8!`a`b!2 3i
0x0100000021000000630b0002000000610062000600020000000200000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 21000000 |
message length |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 02000000 |
vector length |
| 6100 |
null terminated symbol (`a) |
| 6200 |
null terminated symbol (`b) |
| 06 |
type (6 – integer vector) |
| 00 |
attributes |
| 02000000 |
vector length |
| 02000000 |
1st item (2) |
| 03000000 |
2nd item (3) |
Sorted dictionary with atom values
q)-8!`s#`a`b!2 3i
0x01000000210000007f0b0102000000610062000600020000000200000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 21000000 |
message length |
| 7f |
type (127 – sorted dict) |
| 0b |
type (11 – symbol vector) |
| 01 |
attributes (`s#) |
| 02000000 |
vector length |
| 6100 |
null terminated symbol (`a) |
| 6200 |
null terminated symbol (`b) |
| 06 |
type (6 – integer vector) |
| 00 |
attributes |
| 02000000 |
vector length |
| 02000000 |
1st item (2) |
| 03000000 |
2nd item (3) |
Dictionary with vector values
q)-8!`a`b!enlist each 2 3i
0x010000002d000000630b0002000000610062000000020000000600010000000200000006000100000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 2d000000 |
message length |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 02000000 |
vector length (2) |
| 6100 |
null terminated symbol (`a) |
| 6200 |
null terminated symbol (`b) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 02000000 |
list length (2) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 02000000 |
1st item (2) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 03000000 |
1st item (3) |
Table
Note the relation to the previous example.
q)-8!'(flip`a`b!enlist each 2 3i;([]a:enlist 2i;b:enlist 3i))
0x010000002f0000006200630b0002000000610062000000020000000600010000000200000006000100000003000000
0x010000002f0000006200630b0002000000610062000000020000000600010000000200000006000100000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 2f000000 |
message length |
| 62 |
type (98 – table) |
| 00 |
attributes |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 02000000 |
vector length (2) |
| 6100 |
null terminated symbol (`a) |
| 6200 |
null terminated symbol (`b) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 02000000 |
list length (2) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 02000000 |
1st item (2) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 03000000 |
1st item (3) |
Sorted table
Note the relation to the previous example.
q)-8!`s#([]a:enlist 2i;b:enlist 3i)
0x010000002f0000006201630b0002000000610062000000020000000603010000000200000006000100000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 2f000000 |
message length |
| 62 |
type (98 – table) |
| 01 |
attributes (`s#) |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 02000000 |
vector length (2) |
| 6100 |
null terminated symbol (`a) |
| 6200 |
null terminated symbol (`b) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 02000000 |
list length (2) |
| 06 |
type (6 – int vector) |
| 03 |
attributes (`p#) |
| 01000000 |
vector length (1) |
| 02000000 |
1st item (2) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 03000000 |
1st item (3) |
Keyed table
q)-8!([a:enlist 2i]b:enlist 3i)
0x010000003f000000636200630b00010000006100000001000000060001000000020000006200630b0001000000620000000100000006000100000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 3f000000 |
message length |
| 63 |
type (99 – dict) |
| 62 |
type (98 – table) |
| 00 |
attributes |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 6100 |
null terminated symbol (`a) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 02000000 |
1st item (2) |
| 62 |
type (98 – table) |
| 00 |
attributes |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 6200 |
null terminated symbol (`b) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 03000000 |
1st item (3) |
Sorted keyed table
Note the relation to the previous example.
q)-8!`s#([a:enlist 2i]b:enlist 3i)
0x010000003f0000007f6201630b00010000006100000001000000060001000000020000006200630b0001000000620000000100000006000100000003000000
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 3f000000 |
message length |
| 7f |
type (127 – sorted dict) |
| 62 |
type (98 – table) |
| 01 |
attributes (`s#) |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 6100 |
null terminated symbol (`a) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 02000000 |
1st item (2) |
| 62 |
type (98 – table) |
| 00 |
attributes |
| 63 |
type (99 – dict) |
| 0b |
type (11 – symbol vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 6200 |
null terminated symbol (`b) |
| 00 |
type (0 – list) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 06 |
type (6 – int vector) |
| 00 |
attributes |
| 01000000 |
vector length (1) |
| 03000000 |
1st item (3) |
Function
q)-8!{x+y}
0x010000001500000064000a00050000007b782b797d
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 15000000 |
message length |
| 64 |
type (100 – lambda) |
| 00 |
null terminated context (root) |
| 0a |
type (10 – char vector) |
| 00 |
attributes |
| 05000000 |
vector length |
| 7b782b797d |
{x+y} |
Function in a non-root context
q)\d .d
q.d)test:{x+y}
q.d)-8!test
0x01000000160000006464000a00050000007b782b797d
| bytes |
semantics |
| 0x01 |
little endian |
| 000000 |
|
| 16000000 |
message length |
| 64 |
type (100 – lambda) |
| 6400 |
null terminated context (.d) |
| 0a |
type (10 – char vector) |
| 00 |
attributes |
| 05000000 |
length (5) |
| 7b782b797d |
{x+y} |
Enumerations are automatically converted to values before sending through IPC.
Interprocess communication