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String zerlegung

Ein Thema von schwa226 · begonnen am 19. Jun 2012 · letzter Beitrag vom 19. Jun 2012
Antwort Antwort
schwa226

Registriert seit: 4. Apr 2008
400 Beiträge
 
#1

String zerlegung

  Alt 19. Jun 2012, 07:49
Hallo zusammen!

Ich möchte nach dieser Anleitung die Spritpreise analysieren:
http://blog.muehlburger.at/2011/08/2...ps-entwickeln/

Die Antwort vom Server bekomme ich schon als String herrein.
Nun geht es daran den String zu parsen.

Da stoße ich leider auf meine Grenzen wie man das am besten löst!

Kann mir da jemand helfen diesen String in ein Record oder ähnlichen zu verstauen!?

Den String kann man sich einfach über den WebBrowser holen:
Code:
http://www.spritpreisrechner.at/espritmap-app/GasStationServlet?data=%5B%22Graz%22%2C%22DIE%22%2C15.414262484145%2C47.057105360725%2C15.494085024429%2C47.08048974931%5D
Antwort:
Zitat:
[{"kredit":true,"self":false,"spritPrice":[{"amount":"1.299","datAnounce":"2012-06-19 08:45:14","errorItems":[],"errorCode":0,"datValid":1340088314000,"spritId": "DIE"}],"automat":false,"city":"GRAZ","open":true,"distan ce":1.54,"postalCode":"8010","errorItems":[],"priceSearchDisabled":false,"longitude":"15.44703 13302","payMethod":" ","mail":" ","gasStationName":"Shell Austria","fax":" ","clubCard":" ","openingHours":[{"beginn":"06:00","day":{"dayLabel":"Samstag","ord er":6,"errorItems":[],"errorCode":0,"day":"SA"},"end":"23:00"},{"beginn ":"06:00","day":{"dayLabel":"Montag","order":1,"er rorItems":[],"errorCode":0,"day":"MO"},"end":"23:00"},{"beginn ":"06:00","day":{"dayLabel":"Donnerstag","order":4 ,"errorItems":[],"errorCode":0,"day":"DO"},"end":"23:00"},{"beginn ":"06:00","day":{"dayLabel":"Dienstag","order":2," errorItems":[],"errorCode":0,"day":"DI"},"end":"23:00"},{"beginn ":"06:00","day":{"dayLabel":"Mittwoch","order":3," 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Delphi 2010, Update 4 & 5
  Mit Zitat antworten Zitat
Benutzerbild von Uwe Raabe
Uwe Raabe

Registriert seit: 20. Jan 2006
Ort: Lübbecke
11.015 Beiträge
 
Delphi 12 Athens
 
#2

AW: String zerlegung

  Alt 19. Jun 2012, 07:54
Sieht sehr nach JSON aus. In deinem Delphi müsste schon ein passender Parser vorhanden sein.
Uwe Raabe
Certified Delphi Master Developer
Embarcadero MVP
Blog: The Art of Delphi Programming
  Mit Zitat antworten Zitat
schwa226

Registriert seit: 4. Apr 2008
400 Beiträge
 
#3

AW: String zerlegung

  Alt 19. Jun 2012, 08:15
Sieht sehr nach JSON aus. In deinem Delphi müsste schon ein passender Parser vorhanden sein.
Super Danke!
Ja, JSON String wird in der Homepage erwähnt. Habe mir nur nichts dabei gedacht da ich JSON bis jetzt icht kannte!

Wenn ich den String hier durch schicke kommt was raus was Sinn macht:
http://chris.photobooks.com/json/default.htm
Delphi 2010, Update 4 & 5
  Mit Zitat antworten Zitat
schwa226

Registriert seit: 4. Apr 2008
400 Beiträge
 
#4

AW: String zerlegung

  Alt 19. Jun 2012, 10:16
Jetzt habe ich aber doch noch Probleme den JSON String auszuwerten.

1. ich muss vorne und hinten die Klammern '[' & ']' entfernen:
data := MidStr(data, 2, Length(data) - 1);
2. danach lade ich es in das ISuperObject
obj := SO(data);
3. ich bekomme nun ein ISuperObject das ich auch auswerten kann.
Jedoch weis ich jetzt nicht wie ich auf die einzelnen "root" Elemente zugreifen kann

Wenn ich es so mache:
Delphi-Quellcode:
  obj1 := obj.AsObject.O['spritPrice'];
  tmpstr:= obj1.AsString;
  // Klammern vorne und hinten entfernen
  tmpstr:= MidStr(tmpstr, 2, Length(tmpstr) - 1);

  obj1 := SO(tmpstr);

  Spritpreis := obj1.AsObject.S['amount'];
Dann bekomme ich immer sozusagen root[0]. Wie komme ich aber auf root[0..9]?
Delphi 2010, Update 4 & 5
  Mit Zitat antworten Zitat
Benutzerbild von himitsu
himitsu

Registriert seit: 11. Okt 2003
Ort: Elbflorenz
43.151 Beiträge
 
Delphi 12 Athens
 
#5

AW: String zerlegung

  Alt 19. Jun 2012, 11:14
Das ganze ich ein JSON-Array und das sollte man auch als solches Parsen/Einlesen.

[Wert,Wert,...] = Array
{"property":Wert,"property":Wert} = Object
Wert = z.B. Integer, "String", Boolean (TRUE oder FALSE), [Array], {Objekt} usw.

Meistens wird als Root-Element ein Objekt verwendet und du wirst es bestimmt auch so versuchen auszulesen?

Es gibt immer nur ein Root-Element!
Wenn du die Array-Kennung ("[" und "]") wegläßt, dann wird nur der erste Wert eingelesen und danach natürlich aufgehört.

Also entweder als Array einlesen, oder probiers mal mit '{"root"=' + s + '}' zu umschließen.
Garbage Collector ... Delphianer erzeugen keinen Müll, also brauchen sie auch keinen Müllsucher.
my Delphi wish list : BugReports/FeatureRequests

Geändert von himitsu (19. Jun 2012 um 11:19 Uhr)
  Mit Zitat antworten Zitat
schlecki

Registriert seit: 11. Apr 2005
Ort: Darmstadt
148 Beiträge
 
Delphi XE2 Enterprise
 
#6

AW: String zerlegung

  Alt 19. Jun 2012, 11:15
Jetzt habe ich aber doch noch Probleme den JSON String auszuwerten.

1. ich muss vorne und hinten die Klammern '[' & ']' entfernen:
data := MidStr(data, 2, Length(data) - 1);
lass die mal lieber drin. Dabei handelt es sich um ein Array von Objekten.
Delphi-Quellcode:
  obj1 := obj.AsObject.O['spritPrice'];
  tmpstr:= obj1.AsString;
  // Klammern vorne und hinten entfernen
  tmpstr:= MidStr(tmpstr, 2, Length(tmpstr) - 1);

  obj1 := SO(tmpstr);

  Spritpreis := obj1.AsObject.S['amount'];
Das obj.AsObject kannst du dir sparen. Also direkt obj.O['spritpreise'] Das auslesen sollten dann ungefähr so funktionieren:

Delphi-Quellcode:
var
  iter: TSuperObjectIter;
  spData: ISuperObject;
begin
  spData := SO(data);

  if ObjectFindFirst(spData, iter) then
  begin
    repeat
      // Hier hast du Zugriff auf die einzelnen Array-Einträge:
      Writeln(iter.val.AsJson(true));
    until not ObjectFindNext(iter);
    ObjectFindClose(iter);
  end;
end;
  Mit Zitat antworten Zitat
schwa226

Registriert seit: 4. Apr 2008
400 Beiträge
 
#7

AW: String zerlegung

  Alt 19. Jun 2012, 11:48
Danke!

Mit dem AsArray kann ich nun auf alle Werte zugreifen.
Habe vorher nicht verstanden, dass die [..] ein Array bedeuten.

Nun hätte ich noch eine kleine Formatierungs Frage dazu:
Die Werte geben auch eine Uhrzeit mit wann das letzte mal die Daten aktualisiert worden sind:

1. 2012-06-19 09:28:16
2. Tue Jun 19 12:02:22 CEST 2012

Im ersten Format habe ich keine Probleme damit weiter zu arbeiten. Jedoch muss ich das Format von der zweiten Variante in das gleiche Format wie in Variante 1 bringen.

Leider schlagen meine Versuche fehl:
Delphi-Quellcode:
                  DTFormat.TimeSeparator := ':';
                  DTFormat.DateSeparator := ' ';
                  DTFormat.ShortDateFormat := 'ddd mmm d hh:nn:ss yyyy';
                  DTFormat.LongDateFormat := 'ddd mmm d hh:nn:ss yyyy';
                  myDateTime := StrToDateTime(datAnounce, DTFormat);
Delphi 2010, Update 4 & 5
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himitsu

Registriert seit: 11. Okt 2003
Ort: Elbflorenz
43.151 Beiträge
 
Delphi 12 Athens
 
#8

AW: String zerlegung

  Alt 19. Jun 2012, 12:17
StrToDateTime/StrToDate/StrToTime sind schrecklich implementiert und können nicht alle Formate lesen, da selten garnicht der FormatString zur Interpretation herangezogen wird.
(dazu sollte es irgendwo, die letzen 3-12 Monate, einen Thread von mir geben)

Dein Delphi ist doch bestimmt auf deutsch installiert/eingestellt?
Wenn ja, dann sind die Monats- und Wochentags-Strings natürlich auch in deutsch geladen.

Selbst wenn es mit StrToDateTime funktioniert ... mit den falschen Strings kann das schlecht erkannt/übersetzt werden.
DTFormat.ShortMonthNames
DTFormat.LongMonthNames
DTFormat.ShortDayNames
DTFormat.LongDayNames
Garbage Collector ... Delphianer erzeugen keinen Müll, also brauchen sie auch keinen Müllsucher.
my Delphi wish list : BugReports/FeatureRequests
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