IdEncoderMIME doesn't work when created dynamically

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2 total messages Started by Mike Ruskai Thu, 05 Jun 2008 15:18

#212

Author: Mike Ruskai
Date: Thu, 05 Jun 2008 15:18

32 lines
2070 bytes

I looked to this for doing base64 encoding, to save a little time doing my own
implementation (or modifying others, which oddly never seem to take and return
strings as arguments).

It works, but only if I create the component at design time, which is a bit of
a hassle with BCB2007 (no Indy tool palette).

If I create it dynamically, it fails to initialize the variable FCodingTable,
which causes an assertion failure on line 390 of TIdCoder3to4.pas.

I can't see why this would happen, but it does in both BCB6 and BCB2007.  It
sets FFillChar to "=", and, near as I can tell, it should be setting both
variables in the overridden InitComponent function.

The CodingTable property is read-only, so the component can't be used as is if
it's dynamically allocated.

So I did this, which results in a working dynamically-allocatable component:

class Base64 : public TIdEncoderMIME
{
    public:

    __fastcall Base64(TComponent *owner)
        : TIdEncoderMIME(owner)
    {
        FCodingTable=GBase64CodeTable;
    }
};

I have a solution, therefore, but I'd really like to know why it doesn't work
as is, when my limited understanding of Pascal says it should.

Re: IdEncoderMIME doesn't work when created dynamically

#213

Author: Remy Lebeau (TeamB)
Date: Thu, 05 Jun 2008 17:15

14 lines
1457 bytes

"Mike Ruskai" <BUTthannydI@DONTearthlinkLIKE.netSPAM> wrote in message 
news:tmvf441gurbjvu0t4nsca89jrjif3oi4nk@4ax.com...

> If I create it dynamically, it fails to initialize the variable 
> FCodingTable,
> which causes an assertion failure on line 390 of TIdCoder3to4.pas.

That is a known problem in C++.  For whatever reason, the compiler is not 
invoking InitComponent() correctly in C++, but does so fine in Delphi.  I do 
not know why, and do not have a fix yet.


Gambit

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