concatenating string with variable in erlang

Question

I have below string in erlang which I get from Msg#archive_message.body

{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}

I need to make it

  <<"{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}">>

and pass into a function. any help is appreciated.

P_A · Accepted Answer · 2015-05-13 12:08:29Z

1

If

{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}

is a string you just need to convert it to binary with erlang:list_to_binary/1

answered May 13, 2015 at 12:08

P_A

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1 Comment

Gopal S Rathore Over a year ago

P_A ... thanks it works... how to convert it to normal string when we have <<"ererereer">>

brucify · Accepted Answer · 2015-05-13 12:45:55Z

1

Eshell V6.2  (abort with ^G)
1> unicode:characters_to_binary("{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}").
<<"{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}">>

Then you can use jsx to parse it into a list

2> jsx:decode(<<"{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}">>).
[{<<"message">>,<<"tttfdfdfdfdddtt">>},
 {<<"customid">>,<<"454dddfdfdfd">>}]

Or into a map

3> jsx:decode(<<"{\"message\":\"tttfdfdfdfdddtt\",\"customid\":\"454dddfdfdfd\"}">>, [return_maps]).
#{<<"customid">> => <<"454dddfdfdfd">>,
  <<"message">> => <<"tttfdfdfdfdddtt">>}

answered May 13, 2015 at 12:45

brucify

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2 Comments

Gopal S Rathore Over a year ago

NO, why should we use a additional library when its possible with core functions.

brucify Over a year ago

list_to_binary/1 can take only up to 0..255. For example list_to_binary([322]) would crash.

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