IDURI??

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2 total messages Started by federico Fri, 10 Jun 2005 15:46

#3868

Author: federico
Date: Fri, 10 Jun 2005 15:46

24 lines
2020 bytes

Hi, I'm trying to use the IdURI of Indy, but I have some troblues.
-first I'm not exactly sure how to declare an object of this class,  It 
wasnt on the pallet, but thats ok, I  declared an object like this :
TIdURI *something ; (if I did TIdURI something it will tell me a bad 
declaration err so I did it that way),

then when I try to do something->URLEncode(Edit->Text)
I got the following  errors:

[C++ Error] mess.cpp(62): E2034 Cannot convert 'AnsiString' to 'TMetaClass 
*'
[C++ Error] mess.cpp(62): E2342 Type mismatch in parameter 'vmt' (wanted 
'TMetaClass *', got 'AnsiString')
[C++ Error] mess.cpp(62): E2192 Too few parameters in call

And well on the documentation it says that the function headers are like 
this:

 function URLDecode(psSrc: string)

so I'm not pretty sur ewhat did I missdid or what I did wrong, I'll 
apriciate any help, I have been looking for doc on this but couldnt find any 
beside the indy doc.
Thanx for any help!

Re: IDURI??

#3869

Author: Remy Lebeau (TeamB)
Date: Fri, 10 Jun 2005 19:30

49 lines
2680 bytes

"federico" <federico@sandiasazules.com> wrote in message
news:42a9b5da@newsgroups.borland.com...

> -first I'm not exactly sure how to declare an object of this class

    TIdURI *uri = new TIdURI("URIToParse");
    //...
    delete uri;

> It wasnt on the pallet

TIdURI is not a component to begin with, thus it does not appear on the
Component Palette.

> [C++ Error] mess.cpp(62): E2034 Cannot convert 'AnsiString'
> to 'TMetaClass *'

URLEncode() is declared as a 'class' method in Indy's Delphi source code.
The closest C++ equivilent (but not exactly the same) is a 'static' method.
Like a 'static' method, a 'class' method does not need an object instance in
order to be called.  The difference between a Delphi 'class' method and a
C++ 'static' method, however, is that the class type information is passed
to a 'class' method, whereas it is not in a 'static' method.  That is where
the extra TMetaClass parameter comes into play in C++ (it is implicitally
passed in Delphi, much like the 'this' pointer is for non-static methods).
In C++, you have to pass in the class type manually, via the __classid()
keyword, ie:

    ... = something->URLEncode(__classid(TIdURI), Edit->Text);

Or alternatively, without an object instance:

    ... = TIdURI::URLEncode(__classid(TIdURI), Edit->Text);

> And well on the documentation it says that the function headers
> are like this:
>
>  function URLDecode(psSrc: string)

That is a Delphi declaration, not a C++ declaration.  Indy is written in
Delphi, and the documentation shows Delphi examples, not C++ ones.  If you
look in IdURI.hpp, you will see this instead:

    /* class method */ static AnsiString __fastcall URLEncode(TMetaClass*
vmt, const AnsiString ASrc);


Gambit

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