Start Validating while unmarshalling

Validating while unmarshalling

Unmarshal(Value) as TTeenager; try Assert(' Daniele' = Teenager. Register Reverter(TProgrammer, ' Laptops', Laptop List Reverter); Programmer := Un Marshaller.

In this example I have defined all the converter and reverter in another unit in order to have more readable code: ; TProgrammer = class(TTeenager) Laptops: TLaptops; constructor Create; override; destructor Destroy; override; class function Create And Initialize: TProgrammer; end; // Implementation code... Register Converter(TProgrammer, ' Born Date', ISODate Time Converter); Marshaller.

Is therefore necessary to introduce a new pair of Converter / Reverter. Price); Assert(' IBM Travelmate 500' = Programmer.

Introduction Some days ago, Embarcadero has presented the new version of RAD Studio, 2010. Unmarshal(Value) as TProgrammer; try Assert(' Daniele' = Programmer. Age); Assert(Encode Date(1979, 11, 4) = Programmer.

The are many new features, but you can find in a lot places around the web, so I won’t repeat them here. As Type; Result := Format Date Time('yyyy-mm-dd hh:nn:ss', date); end); Marshaller. Free; end; // Un Marshalling Teenager Un Marshaller := TJSONUn Marshal. Register Reverter(TTeenager, ' Born Date', procedure(Data: TObject; Field: string; Arg: string) var ctx: TRtti Context; datetime: TDate Time; begin datetime := Encode Date Time(Str To Int(Copy(Arg, 1, 4)), Str To Int(Copy(Arg, 6, 2)), Str To Int(Copy(Arg, 9, 2)), Str To Int(Copy(Arg, 12, 2)), Str To Int(Copy(Arg, 15, 2)), Str To Int(Copy(Arg, 18, 2)), 0); ctx. First Name); Assert(' Teti' = Programmer.

It is typically used when data must be moved between different parts of a computer program or from one program to another. To String); // Un Marshalling Kid Un Mar := TJSONUn Marshal. Un Marshal(Serialized Kid) as TKid; try //now kid is the same as before marshalling Assert(Kid. Suppose we add the date of birth to our TKid: Serialize a TDate Time, localized and that I have in JSON string is a float, because for Delphi TDate Time is a decimal number. Register Converter(TKid, ' Born Date', function(Data: TObject; Field: string): string var ctx: TRtti Context; date : TDate Time; begin date := ctx.

The opposite, or reverse, of marshalling is called unmarshalling (demarshalling) (similar to deserialization).” –Wiki Pedia In Delphi 2010 the process of serialization and deserialization is handled respectively by a Marshaller and an Unmarshaller. If I read the data from another program Delphi, no problem, but if I wanted to read a script in Java Script?

One of the things widely requested from all Delphi programmers all over the world over the past few years, including myself, is certainly a new and more powerful RTTI. To access the JSON string that is our object, we must call the method To String. Set Value(Data, datetime); end); The anonymous method is called when the marshaller serializes the field ‘Born Date’ is called “Converter” while Unmarshaller anonymous method that calls when he has to reconstruct the object from the JSON string is the “Reverter”. Register Converter(TString List, function(Data: TObject): TList Of Strings var i, count: integer; begin count := TString List(Data).count; Set Length(Result, count); for i := 0 to count - 1 do Result[i] := TString List(Data)[i]; end); //TString List Converter Teenager := TTeenager. Marshal(Teenager) as TJSONObject; finally Teenager.

The new system of RTTI has finally arrived, and pave the way for a large number of applications. The JSON representation of this object Serialized Kid can be saved to file, sent to a remote server, used by a Web page from a web service, stored on a database or sent into space (!!! The Delphi application re-read the JSON string, you can recreate the object as it was at the time of serialization. As Type; Result := Format Date Time('yyyy-mm-dd hh:nn:ss', date); end); //Un Marshaller Un Marshaller. Thus serializing a TKid assure you that my object is readable both by Delphi from another language without loss of information.

One area that has benefited from the new RTTI is for sure the marshaled objects. Marshal(Kid) as TJSONObject; finally Free And Nil(Kid); end; finally Mar. But anyone with a JSON parser can still read the data in our object, even non Delphi client. Register Reverter(TKid, ' Born Date', procedure(Data: TObject; Field: string; Arg: string) var ctx: TRtti Context; datetime: TDate Time; begin datetime := Encode Date Time(Str To Int(Copy(Arg, 1, 4)), Str To Int(Copy(Arg, 6, 2)), Str To Int(Copy(Arg, 9, 2)), Str To Int(Copy(Arg, 12, 2)), Str To Int(Copy(Arg, 15, 2)), Str To Int(Copy(Arg, 18, 2)), 0); ctx. But what happens when I have to serialize a complex type? Register Converter(TTeenager, ' Born Date', function(Data: TObject; Field: string): string var ctx: TRtti Context; date : TDate Time; begin date := ctx.

Marshaling is defined as follows: “In computer science, marshalling (similar to serialization) is the process of transforming the memory representation of an object to a data format suitable for storage or transmission. Free; end; //Output the JSON version of the Kid object Write Ln(Serialized Kid. These are the advantages of having used an open format and standard. How serialize a field differently from the default? Then I use a format “DATA” to understand, even for these languages. Is needed, however, to tell the Marshaller and Un Marsheller how to represent and reconstruct a particular object field by two statements like the following: //marshaller Marshaller. Suppose we extend TKid this: var Marshaller: TJSONMarshal; Un Marshaller: TJSONUn Marshal; Teenager: TTeenager; Value, JSONTeenager: TJSONObject; begin Marshaller := TJSONMarshal.

The client application must supply a context path which is a list of colon (':') separated java package names that contain schema derived classes.