Return RawJSON parameter in interfaced service and decode error

jaclas · 2017-01-18 08:52:05

I have server based on interfaced services.
In service I have method:

    function GetAnnouncementList(out aAnnouncementList: TAnnouncementDataList): Integer;

where:

  TAnnouncementDataList = TArray<RAnnouncementData>;

  RAnnouncementData = record
    UUID : TAnnouncementUUID;
    ReleaseTimestamp: TUnixTimestampUTC;
    DeadTimestamp : TUnixTimestampUTC;
    Topic: RawUTF8;
    ContentsType: SmallInt;
    TagList : RawJSON;   <------------------------------------------ this is problematic
    DemoVersionMode : AnsiChar;
    PersonKind : AnsiChar;
  end;

On client side I get this array like:

{"result":[[{"UUID":"16551D01-CA15-4B32-BDFB-F5D0BDDA42E7","ReleaseTimestamp":1484210095,"DeadTimestamp":1486767600,"Topic":"Msg from: 2017-01-12 09:34:54","ContentsType":66,
"TagList":"{"Tag":["11","22","33","44"]}","DemoVersionMode":76,"PersonKind":78},{"UUID":"FB5A930F-3D3C-4395-B4AC-81CA639E490C","ReleaseTimestamp":1484210097,"DeadTimestamp":1486767600,"Topic":"Msg from: 2017-01-12 09:34:57","ContentsType":66,
"TagList":"{"Tag":["11","22","33","44"]}","DemoVersionMode":76,"PersonKind":78}],2]}

Pay attention that TagList has quotes around:

--->"{"Tag":["11","22","33","44"]}"<---

and client raise exception EInterfaceFactoryException on decoding this:

''Invalid returned JSON content: expects {result:...}, got {"result~~[[{"UUID":"16551D01-CA15-4B32-BDFB-F5D0BDDA42E7","ReleaseTimestamp":1484210095,"DeadTimestamp":1486767600,"Topic":"Wiadomość z chwili: 2017-01-12 09:34:54","ContentsType":66,"TagList":"{"Tag":["11","22","33","44"]}","DemoVersionMode":76,"PersonKind":78},{"UUID":"FB5A930F-3D3C-4395-B4AC-81CA639E490C","ReleaseTimestamp":1484210097,"DeadTimestamp":1486767600,"Topic":"Wiadomość z chwili: 2017-01-12 09:34:57","ContentsType":66,"TagList":"{"Tag":["11","22","33","44"]}","DemoVersionMode":76,"PersonKind":78}],2]}''

I generate the JSON in business code on the server side and I want to send it to the client.

What am I doing wrong? How can I do this right?

Last edited by jaclas (2017-01-18 08:53:40)

warleyalex · 2017-01-18 12:04:40

Hi, experiment to return the method as boolean.

ab · 2017-01-18 12:17:46

1. Define your record as packed.
2. Try with text registration of the record layout.
3. Or use a variant for the field, to store a TDocVariant content.

jaclas · 2017-01-18 12:50:26

Problem is no with record, but with field of type RawJSON that is coded with additional quotes and on client side decoding of server response raise error. Without this field call is sucessful.

{"UUID":"16551D01-CA15-4B32-BDFB-F5D0BDDA42E7",
"ReleaseTimestamp":1484210095,
"DeadTimestamp":1486767600,
"Topic":"Msg from: 2017-01-12 09:34:54",
"ContentsType":66,
"TagList":"{"Tag":["11","22","33","44"]}",  <---- see this, JSON parser not decoding this strange item
"DemoVersionMode":76,
"PersonKind":78}}

It seems to me that the type of RawJSON should be wrapped (be escaped).

Last edited by jaclas (2017-01-18 13:14:10)

Junior/RO · 2017-01-18 13:38:25

If you change the type RawJSON to RawUTF8?

ab · 2017-01-18 14:52:00

1. Define your record as packed.
2. Try with text registration of the record layout.
3. Or use a variant for the field, to store a TDocVariant content.

jaclas · 2017-01-18 21:14:33

Junior/RO wrote:

If you change the type RawJSON to RawUTF8?

It helped (escaping string in response), thx.
But I don't understand what is the type of RawJSON?

ab · 2017-01-19 08:51:22

There was a bug in TJSONCustomParserRTTI.WriteOneLevel.

Please check http://synopse.info/fossil/info/a43c1620e1

jaclas · 2017-01-19 12:10:48

Thanks! But why do you paste three point list for me? ;-)

ab · 2017-01-19 13:45:02

Because you did not try those three points...
At that time, it was not clear to me that there was a bug!

jaclas · 2017-01-19 15:49:35

I knew that these points was blind ;-P

mORMot Open Source

#1 2017-01-18 08:52:05

Return RawJSON parameter in interfaced service and decode error

#2 2017-01-18 12:04:40

Re: Return RawJSON parameter in interfaced service and decode error

#3 2017-01-18 12:17:46

Re: Return RawJSON parameter in interfaced service and decode error

#4 2017-01-18 12:50:26

Re: Return RawJSON parameter in interfaced service and decode error

#5 2017-01-18 13:38:25

Re: Return RawJSON parameter in interfaced service and decode error

#6 2017-01-18 14:52:00

Re: Return RawJSON parameter in interfaced service and decode error

#7 2017-01-18 21:14:33

Re: Return RawJSON parameter in interfaced service and decode error

#8 2017-01-19 08:51:22

Re: Return RawJSON parameter in interfaced service and decode error

#9 2017-01-19 12:10:48

Re: Return RawJSON parameter in interfaced service and decode error

#10 2017-01-19 13:45:02

Re: Return RawJSON parameter in interfaced service and decode error

#11 2017-01-19 15:49:35

Re: Return RawJSON parameter in interfaced service and decode error

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