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POJSON to StringList using Delphi Xe5
 

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    <p>I am using Delphi Xe5 and I have a component that essentially uses IDTCPCLient (sockets) to talk with are server and retrieve data in the form of JSON. I have spared you all the connection code , etc. It works. The returned JSon works as well. The trouble I am having is converting my JSON into a StringList, which I then use to write out a list of values to a listbox and store the rest of the JSON data objects in the TSTrings OBjects property.</p> <p>I have a number of funny things happen. </p> <p>1.) I can't for the life of me get the List property to work properly. I use this list to store my JSON. A string value and then the entire object for each item in the list. You will notice that in the JSONToStringList method, I clear the stringlist (it is commented out, becuase when it isn't, my program hangs)</p> <p>2.) I get dupplicate values in my list after calling the method more than once for multiple JSON sets needed</p> <pre><code>TConnector = class(TComponent) private { Private declarations } FList: TStrings; procedure SetList(const Value: TStrings); protected { Protected declarations } public { Public declarations } Constructor Create( AOwner : TComponent ); override; Destructor Destroy; Override; Procedure GenerateJSON; Procedure JSONToStringList(aJSonKey: String); published { Published declarations } property List: TStrings Read FList Write SetList; end; Constructor TConnector.Create(AOwner: TComponent); begin inherited; FList:= TStringList.Create(True); end; destructor TConnector.Destroy; begin if FList &lt;&gt; nil then FreeAndNil(FList); inherited; end; Procedure TConnector.GenerateJSON; begin if ResponseStream&lt;&gt;nil then Begin FreeAndNil(ResponseJSON_V); ResponseJSON_V := TJSONObject.ParseJSONValue(StreamToArray(ResponseStream),0) as TJSONValue; End; end; procedure TConnector.JSONToStringList(aJSonKey: String); Var zLJsonValue : TJSONValue; zLJSONArray: TJSONArray; zLJsonObject : TJSONObject; zI : Integer; begin if ResponseJSON_V is TJSONArray then begin zLJSONArray:= ResponseJSON_V as TJSONArray; zLJsonObject := zLJSONArray.Get(0) as TJSONObject; end else if ResponseJSON_V is TJSONObject then begin zLJSONArray:= nil; zLJsonObject := ResponseJSON_V as TJSONObject; end else Exit; if zLJSONArray&lt;&gt;nil then begin ***//FList.Clear;*** for zLJsonValue in zLJSONArray do begin zLJsonObject := zLJsonValue as TJSONObject; for zI := 0 to zLJsonObject.Size-1 do begin if zLJsonObject.Get(zI).JsonString.Value = aJSonKey then begin FList.AddObject(zLJsonObject.Get(zI).JSONValue.Value, zLJsonObject); end; end; end; end else begin FList.Clear; for zI := 0 to zLJsonObject.Size-1 do begin if zLJsonObject.Get(zI).JsonString.Value = aJSonKey then FList.AddObject(zLJsonObject.Get(zI).JSONValue.Value, TJSONPair(zLJsonObject.Get(zI))); end; end; end; </code></pre> <p>I hope this is all understandable. Please let me know if you need to see more. Please feel free to correct anything else you see bad in my code. I am always learning :) - thank you for your help</p>
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