[Lazarus] the protected property TCompressionStream.OnProgress

[闫程远]

well, that worked. thanks.
but there's still a problem:
when i tried to assign a method to the OnProgress property, i got a error
message:

UCryptForm.pas(100,37) Error: Wrong number of parameters specified for call
to "CsOnprogress"
UCryptForm.pas(59,22) Hint: Found declaration:
TCryptForm.CsOnprogress(TObject);
UCryptForm.pas(193, stopping


the method was declared and implemented as follow:

  TCryptForm = class(TForm)
    //... other declarations
    procedure CsOnprogress(Sender:TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

procedure TCryptForm.CsOnProgress(Sender:TObject);
begin
  pb.Position:=Integer(TCompressionStream(Sender).Position div 1024);
  Application.ProcessMessages;
end;

and i assigned the method in this way:
cs.onProgress:=Self.CsOnprogress;

why does this get CE?


2009/7/10 Antônio <antoniog12345 at gmail.com>

> Well, you could derive a class and publish the property.
>
> Antônio
>
> 2009/7/10 闫程远 <yanchengyuan at gmail.com>
>
>> Hi all!
>> i wanted to compress a file using TCompressionStream, with a progressbar
>> to show the progress.
>> i wrote the code but they got Compilation Error:
>>
>> var
>>   fs,ms:TMemoryStream;
>>   cs:TCompressionStream;
>>   size:int64;
>> begin
>>   fs:=TMemoryStream.Create;
>>   fs.LoadFromFile(SourceFile.Text);
>>   size:=fs.Size;
>>
>>   ms:=TMemoryStream.Create;
>>   ms.Write(size,sizeof(size));
>>
>>   cs:=TCompressionStream.create(clMax,ms);
>>   pb.Max:=Integer(size div 1024);
>>   cs.onProgress:=CsOnProgress;
>>   fs.SaveToStream(cs);
>>   cs.Free;
>>
>>   ms.SaveToFile(DestFile.Text);
>>   ms.Free;
>>   fs.Free;
>> end;
>>
>>
>> the Error Messages are:
>> UCryptForm.pas(105,6) Error: identifier idents no member "onProgress"
>> UCryptForm.pas(105,30) Error: Wrong number of parameters specified for
>> call to "CsOnprogress"
>> UCryptForm.pas(63,22) Hint: Found declaration:
>> TCryptForm.CsOnprogress(TObject);
>> UCryptForm.pas(198) Fatal: There were 2 errors compiling module, stopping
>>
>> i searched on the web, and found this page:
>> http://community.freepascal.org:10000/docs-html/fcl/zstream/tcompressionstream.onprogress.html
>> in this page, the OnProgress property was declared as "public", and on my
>> machine, the property is declared as "protected".
>>
>> Can anybody tell me why?
>> Thanks in advance.
>> --
>> Regards,
>> Yan Chengyuan
>>
>> --
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>>
>>
>
> --
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-- 
Regards,
Yan Chengyuan
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