Re: [Lazarus] Fwd: Need help in streaming components
Thank you for your respond. I find that my real problem is more complex and need more help from you. I want my TClass1 can contain many TClass2. It means that number of TClass2 in TClass1 is not fixed. I've tried to use TComponentList, but it does not work. I knew that TCollection supports streaming, however, TClass1 and TClass2 must be TComponent. 2014-12-15 0:23 GMT+07:00 Howard Page-Clark : > > On 14/12/2014 12:23, Kiên Nguyễn Tiến Trung wrote: > >> >> I am trying to streaming. I spent a lot of time but I didn't find the >> proper solution. >> >> I have two classes, TClass1, TClass2. Although the parent of AClass2 is >> AClass1, AClass2 isn't saved into specified file, only AClass1 is. >> > > AClass1 is not the parent of AClass2. The two classes have no > relationship, certainly not a hierarchical relationship. > > You make AClass1 the *owner* (not the *ancestor*) of AClass2 for that > single instantiation in your program (i.e. responsible for correctly > freeing the instance). > > However, TClass1 and TClass2 are completely unrelated, and know nothing > about each other's properties. > Perhaps you are looking for something like the attached zipped unit1.pas. > > Howard > > > > > > --- > This email has been checked for viruses by Avast antivirus software. > http://www.avast.com > > -- > ___ > Lazarus mailing list > Lazarus@lists.lazarus.freepascal.org > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus > > -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Fwd: Need help in streaming components
Try TObjectList. 2014-12-15 1:02 GMT-03:00 Kiên Nguyễn Tiến Trung : > > Thank you for your respond. I find that my real problem is more complex > and need more help from you. > > I want my TClass1 can contain many TClass2. It means that number of > TClass2 in TClass1 is not fixed. > > I've tried to use TComponentList, but it does not work. I knew that > TCollection supports streaming, however, TClass1 and TClass2 must be > TComponent. > > 2014-12-15 0:23 GMT+07:00 Howard Page-Clark : > >> On 14/12/2014 12:23, Kiên Nguyễn Tiến Trung wrote: >> >>> >>> I am trying to streaming. I spent a lot of time but I didn't find the >>> proper solution. >>> >>> I have two classes, TClass1, TClass2. Although the parent of AClass2 is >>> AClass1, AClass2 isn't saved into specified file, only AClass1 is. >>> >> >> AClass1 is not the parent of AClass2. The two classes have no >> relationship, certainly not a hierarchical relationship. >> >> You make AClass1 the *owner* (not the *ancestor*) of AClass2 for that >> single instantiation in your program (i.e. responsible for correctly >> freeing the instance). >> >> However, TClass1 and TClass2 are completely unrelated, and know nothing >> about each other's properties. >> Perhaps you are looking for something like the attached zipped unit1.pas. >> >> Howard >> >> >> >> >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> http://www.avast.com >> >> -- >> ___ >> Lazarus mailing list >> Lazarus@lists.lazarus.freepascal.org >> http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus >> >> > -- > ___ > Lazarus mailing list > Lazarus@lists.lazarus.freepascal.org > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus > > -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Fwd: Need help in streaming components
On 15/12/2014 04:02, Kiên Nguyễn Tiến Trung wrote: Thank you for your respond. I find that my real problem is more complex and need more help from you. I want my TClass1 can contain many TClass2. It means that number of TClass2 in TClass1 is not fixed. You may have to add procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override; to TClass1 procedure TClass1.GetChildren(Proc: TGetChildProc; Root: TComponent); begin for i = 0 to ListOfClass2.count-1 do Proc(ListOfClass2[i]); end; When loaded you need to put them back into that list. You con override TClass2.Loaded. The Owner of each Class2 will be the Class1 that saved it. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Fwd: Need help in streaming components
On Mon, 15 Dec 2014 07:34:12 -0300 Glaucos Ginez wrote: > Try TObjectList. That does not support streaming. >[...] > > I want my TClass1 can contain many TClass2. It means that number of > > TClass2 in TClass1 is not fixed. > > > > I've tried to use TComponentList, but it does not work. I knew that > > TCollection supports streaming, however, TClass1 and TClass2 must be > > TComponent. The trick is overriding some TComponent methods. TClass1 procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override; TClass2 procedure SetParentComponent(Value: TComponent); override; function GetParentComponent: TComponent; override; function HasParent: Boolean; override; See for example lazarus/examples/designnonlcl/mywidgetset.pas class TMyWidget Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Fwd: Need help in streaming components
I got it! Thank all of you very much. 2014-12-15 17:49 GMT+07:00 Mattias Gaertner : > > On Mon, 15 Dec 2014 07:34:12 -0300 > Glaucos Ginez wrote: > > > Try TObjectList. > > That does not support streaming. > > > >[...] > > > I want my TClass1 can contain many TClass2. It means that number of > > > TClass2 in TClass1 is not fixed. > > > > > > I've tried to use TComponentList, but it does not work. I knew that > > > TCollection supports streaming, however, TClass1 and TClass2 must be > > > TComponent. > > The trick is overriding some TComponent methods. > > TClass1 > procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override; > TClass2 > procedure SetParentComponent(Value: TComponent); override; > function GetParentComponent: TComponent; override; > function HasParent: Boolean; override; > > See for example > lazarus/examples/designnonlcl/mywidgetset.pas > class TMyWidget > > > Mattias > > -- > ___ > Lazarus mailing list > Lazarus@lists.lazarus.freepascal.org > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus > -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
