🚀 go-pugleaf

Sanjay Patel wrote:

>     Application->CreateForm(__classid(TMyProj), &MyProj);
> 
> In the debugger I receive following error message:
> 
>     "Project MyProj.exe raised exception class EAccessViolation with message 
> 'Access violation at address 77C47EFB in module 'msvcrt.dll'.  Read of 
> address 00000000.' Process stopped.  Use Step or Run to continue"

Are you using FormCreate()/FormDestroy() ?

If so then stop doing that. Move respective code to the constructor/destructor.

You might first try however to set OldCreateOrder to true;

Hans.

Hans,

Yes, I am still using FormCreate to create my form. I tried both of your 
suggestion and unfortunately problem still exist. My main code to create 
form is as below:

//---------------------------------------------------------------------------

#include <vcl\vcl.h>

#pragma hdrstop

//---------------------------------------------------------------------------

USEFORM("customer.cpp", CustInfo);

USERES("custproj.res");

USEFORM("ScanSetup.cpp", ScanSetupFrm);

//---------------------------------------------------------------------------

WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)

{

try

{

Application->Initialize();

Application->CreateForm(__classid(TCustInfo), &CustInfo); // <---- This line 
has problem and I receive error message.

Application->CreateForm(__classid(TScanSetupFrm), &ScanSetupFrm);

Application->Run();

}

catch (Exception &exception)

{

Application->ShowException(&exception);

}

return 0;

}

When I trace in debugger by stepping into code by "F7" then the following 
line in "Forms.cpp" creates the exception.

procedure TApplication.CreateForm(InstanceClass: TComponentClass; var 
Reference);

var

Instance: TComponent;

begin

Instance := TComponent(InstanceClass.NewInstance);

TComponent(Reference) := Instance;

try

Instance.Create(Self); //<--- This lines creates Exception

except

TComponent(Reference) := nil;

raise;

end;

Any other suggestion or help will be great! Can I use older version of 
MSVCRT.DLL and put it in home directory where my *.exe is residing? Will 
then my *.exe use that old MSVCRT.DLL?

Thank you,

Sanjay Patel


=================================================================================================
"Hans Galema" <notused@notused.nl> wrote in message 
news:449e41d6@newsgroups.borland.com...
> Sanjay Patel wrote:
>
>>     Application->CreateForm(__classid(TMyProj), &MyProj);
>>
>> In the debugger I receive following error message:
>>
>>     "Project MyProj.exe raised exception class EAccessViolation with 
>> message 'Access violation at address 77C47EFB in module 'msvcrt.dll'. 
>> Read of address 00000000.' Process stopped.  Use Step or Run to continue"
>
> Are you using FormCreate()/FormDestroy() ?
>
> If so then stop doing that. Move respective code to the 
> constructor/destructor.
>
> You might first try however to set OldCreateOrder to true;
>
> Hans. 

Sanjay Patel wrote:

> Yes, I am still using FormCreate to create my form. I tried both of your 
> suggestion and unfortunately problem still exist. My main code to create 
> form is as below:

> Application->CreateForm(__classid(TCustInfo), &CustInfo); // <---- This line 
> has problem and I receive error message.

Well that is not your code. That is code generated by the IDE.

I meant that you do not use

void __fastcall TCustInfo::FormCreate(TObject *Sender)
{
  // your initialisationcode
}

but place that initialisationcode in the constructor:

__fastcall TCustInfo::TCustInfo(TComponent* Owner)
   : TForm(Owner)
{
   //initialisation code
}

To debug your project: outcomment all code in the constructor
and see if you still get the error.

By the way: How did you start the bcb5 project? Did you let
it automatically convert the .mak/.prj file ? If so then that was
the wrong way. Start a new project and add all the units manually.

Hans.

Hans,

I created new project under C++ Builder 5 and added one form at a time.  Now 
the error has moved somewhere else but it is still happening.  I am so lost 
I don't know what to do.

Any other idea.
"Hans Galema" <notused@notused.nl> wrote in message 
news:449fc805@newsgroups.borland.com...
> Sanjay Patel wrote:
>
>> Yes, I am still using FormCreate to create my form. I tried both of your 
>> suggestion and unfortunately problem still exist. My main code to create 
>> form is as below:
>
>> Application->CreateForm(__classid(TCustInfo), &CustInfo); // <---- This 
>> line has problem and I receive error message.
>
> Well that is not your code. That is code generated by the IDE.
>
> I meant that you do not use
>
> void __fastcall TCustInfo::FormCreate(TObject *Sender)
> {
>  // your initialisationcode
> }
>
> but place that initialisationcode in the constructor:
>
> __fastcall TCustInfo::TCustInfo(TComponent* Owner)
>   : TForm(Owner)
> {
>   //initialisation code
> }
>
> To debug your project: outcomment all code in the constructor
> and see if you still get the error.
>
> By the way: How did you start the bcb5 project? Did you let
> it automatically convert the .mak/.prj file ? If so then that was
> the wrong way. Start a new project and add all the units manually.
>
> Hans. 

Sanjay Patel wrote:

> I don't know what to do.
> 
> Any other idea.
> "Hans Galema" <notused@notused.nl> wrote in message 

>>To debug your project: outcomment all code in the constructor
>>and see if you still get the error.

You did not comment on that suggestion.

Hans.

Hans,

Thanks for your help.  I ended creating brand new project under C++ 5 and 
re-added everything manuall and it is working now.

Thank you
Sanjay T. Patel

"Hans Galema" <notused@notused.nl> wrote in message 
news:44ae2280$1@newsgroups.borland.com...
> Sanjay Patel wrote:
>
>> I don't know what to do.
>>
>> Any other idea.
>> "Hans Galema" <notused@notused.nl> wrote in message
>
>>>To debug your project: outcomment all code in the constructor
>>>and see if you still get the error.
>
> You did not comment on that suggestion.
>
> Hans.