Question

I am really new to Delphi and I am doing an experiment on how to output JSON array through delphi. This maybe sound simple to anyone but I just dont know how. I already created a simple program.

Now, what i want to do is to create a command/request with parameter like:

http://localhost:8001/hello?json={"names":["Jay","Chris","John"]}

that would create a result in the browser like this:

{
result: ["Hello Jay","Hello Chris","Hello John"],
id: "",
time_elapsed: 0
}

Please, i really need help on this. Anybody?

EDIT:
This is the code i just did today but it still doesn’t show my desired output:

procedure TPrimeJSONMHelloPeople.ProcessJSONRPCRequest(
  var ResultValue: TlkJSONbase; var ResultSuccess: Boolean);
  var

    jsonPeople:TlkJSONlist;
    dmPool:TObject;
    dm:TPrimeDataModuleBaseDM;
    i:integer;

  begin
    FjsonObj1 := TlkJSONobject.Create;
    jsonPeople := FjsonObj1.CreateListValue('names');
    jsonPeople.AddVarString('jay');
    jsonPeople.AddVarString('ann');
    jsonPeople.AddVarString('john');
    inherited;

    CheckRequiredParameter('names');

    PrimeDataModuleWebService.TDataModuleDMCreateInstanceDefault(dmPool);
      try
         dm := TPrimeDataModuleDefaultDM(dmPool).GetModule;
         try

         //this part here will loop and output the name
         //if jsonPeople <> nil then

         if Params.Field['names'] <> nil then
           begin
             for i := 0 to FjsonObj1.Field['names'].Count - 1 do
             begin           
               ResultValue := TlkJSONlist.Create
             end;

         end;
       ResultValue := TlkJSONlist.Create;
       finally
       dm.Release;
      end;
    finally
  dmPool.Free;
 end;
   FjsonObj1.Free;
   ResultSuccess := True;
 end;

I don’t know what’s missing in the code, It only shows:
{

result: [ ],
id: "",
time_elapsed: 0

}

and not :
{
result: ["Hello Jay","Hello Chris","Hello John"],
id: "",
time_elapsed: 0
}

Answer 1

i have just found the right answer. Here’s the code:

procedure TSample1.ProcessJSONRPCRequest(
  var ResultValue: TlkJSONbase; var ResultSuccess: Boolean);
  var

    dmPool:TObject;
    dm:TPrimeDataModuleBaseDM;

    jsonPeople:TlkJSONlist;    //used Tlkjsonlist since I want to create an array
    i:integer;
  begin
  inherited;
    jsonPeople:=TlkJSONlist.Create;  //create jsonPeople as an array

    CheckRequiredParameter('names'); //names parameter needed
    PrimeDataModuleWebService.TDataModuleDMCreateInstanceDefault(dmPool);
    try
      dm := TPrimeDataModuleDefaultDM(dmPool).GetModule;
      try
        if Params.Field['names'] <> nil then //check if the names parameter is empty
        begin
          ResultValue:=jsonPeople;
          for i := 0 to Params.Field['names'].Count - 1 do
          begin
            jsonPeople.AddVarString('hello ' + Params.Field['names'].Child[i].value);
          end;
        end;
      finally
        dm.Release;
      end;
    finally
    dmPool.Free;
  end;
  ResultSuccess := True;
end;

end.

The request is http://localhost/sample1?json={"names":["john","jay"]}
The output is

{

    -
    result: [
        "hello john"
        "hello jay"
    ]
    id: ""
    time_elapsed: 0

}

Hope this can help someone who is new in creating web service request using delphi.