🚀 go-pugleaf

"Stuart Kelly" <stuart@dkelly1.demon.co.uk> wrote in message
news:43df5c2e$1@newsgroups.borland.com...

> I have imported a C++Builder 6 project into C++Builder 2006
> and am now getting EAccessViolations when I create a form with
> a TIdFTP component at run time.  I am using Indy 9 as recommended.

What is the actual error message?  Where exactly does it occur?  Please
provide more details.


Gambit

>
>What is the actual error message?  Where exactly does it occur?
>Please provide more details.
>

If I remove the try/catch block this is the error I get.

"Access violation at address 0056BBD4 in module 'OrderMaker.exe'.  Read address of 00000000.

The form is created dynamically at run time.  The error accurs juring the form creation.  

If I step through the code the error accours during the InternalReadComponentRes function called in InitInheritedComponent.

Stuart

"Stuart Kelly" <stuart@no.spam.com> wrote in message
news:43e0722f$1@newsgroups.borland.com...

> "Access violation at address 0056BBD4 in module 'OrderMaker.exe'.
> Read address of 00000000.

The code is accessing a NULL pointer somewhere.

> The form is created dynamically at run time.  The error accurs juring the
form creation.

Can you narrow it down any further?  Do you have the same problem if you
create the TIdFTP instance dynamically at runtime?

> If I step through the code the error accours during the
> InternalReadComponentRes function called in
> InitInheritedComponent.

That is not very helpful.  All that tells us is that the error is occuring
during DFM streaming.  But it does not say which specific object/property
was being streamed at the time of the error.


Gambit

>> The form is created dynamically at run time.  The error accurs juring the
>form creation.
>
>Can you narrow it down any further?  Do you have the same problem if you
>create the TIdFTP instance dynamically at runtime?

The same problem occurs if I create the instance dynamically.

However if I step though the code the error accours in the 
constructor TIdComponent.Create(axOwner: TComponent); function in IdComponent.pas.

The error accours during GStackCriticalSection.Acquire call.

>
>> If I step through the code the error accours during the
>> InternalReadComponentRes function called in
>> InitInheritedComponent.
>
>That is not very helpful.  All that tells us is that the error is occuring
>during DFM streaming.  But it does not say which specific object/property
>was being streamed at the time of the error.
>

Sorry, for lack of detail, I don't have much experience with Delphi.

"Stuart Kelly" <stuart@no.spam.com> wrote in message
news:43e1ca39$1@newsgroups.borland.com...

> The same problem occurs if I create the instance dynamically.

Can you please show the code?

> However if I step though the code the error accours in the
> constructor TIdComponent.Create(axOwner: TComponent);
> function in IdComponent.pas.
>
> The error accours during GStackCriticalSection.Acquire call.

That suggests that the critical section has not been created yet when you
are instantiating the component.  The only way that can happen is if the
Indy library has not been initialized properly by the VCL runtime.


Gambit

> Can you please show the code?
> 

Do you want me to post the whole project as a zip file?

The code for dynamic allocation is as follows.

TIdFTP *TestFTP;

try
{
   TestFTP = new TIdFTP(this);
} // end try
catch (Exception &e)
{
   ShowMessage(e.Message);
} // end catch

>> However if I step though the code the error accours in the
>> constructor TIdComponent.Create(axOwner: TComponent);
>> function in IdComponent.pas.
>>
>> The error accours during GStackCriticalSection.Acquire call.
> 
> That suggests that the critical section has not been created yet when you
> are instantiating the component.  The only way that can happen is if the
> Indy library has not been initialized properly by the VCL runtime.
> 

The project was a C++Builder 6 project imported into C++Builder 2006, 
could this have caused an error in the project file?

Stuart

Don't know if this helps.

I tried creating a simple program with just a IdFTP component in 
C++Builder 6, this complied and ran ok.

Then I imported the project into C++Builder 2006.  It compiled ok, but 
generated the same exception.

Do you want me to post the project or add it to QC?

Stuart

"Stuart Kelly" <stuart@nospam.com> wrote in message
news:43e1e4e6$1@newsgroups.borland.com...

> The project was a C++Builder 6 project imported into C++Builder
> 2006, could this have caused an error in the project file?

Possibly, yes.  Borland IDEs for C++ have never had good project importers
implemented.  BDS 2006 is no exception to that (although it is better then
in previous versions).  The best thing to do when upgrading a project to a
new IDE is to always create a new project in that IDE and then migrate the
existing source code into it.  Don't import/upgrade the project iself.


Gambit

> 
>> The project was a C++Builder 6 project imported into C++Builder
>> 2006, could this have caused an error in the project file?
> 
> Possibly, yes.  Borland IDEs for C++ have never had good project importers
> implemented.  BDS 2006 is no exception to that (although it is better then
> in previous versions).  The best thing to do when upgrading a project to a
> new IDE is to always create a new project in that IDE and then migrate the
> existing source code into it.  Don't import/upgrade the project iself.
> 

OK Thanks, I'll recreate the project as you suggest.

I've also posted a test case on QC - 24402.

Thanks for your help.

Stuart