Forum > Open other Page

Forum link

10-21-2020, 05:01 PM:

Hi Guys

I have some little problem

I have two forms on my test application. But I can not open the second form.

I have create a button. On click this button

Form3->Show(); not work

IWForm3->Show(); not work

TIWForm3->Show(); not work....

Can you helb me? I work with c++Builder.

Thanks

10-21-2020, 06:24 PM:

1) "I can not open the second form." is not very descriptive. What exactly happens when you try these?

2) Have you looked at the demos? While C++ has a slightly different syntax, the steps to do so are the same as Delphi.

3) What is Form3? I assume a variable? Have you created an instance?

10-23-2020, 04:08 PM:

Hello kudzu

Thanks.

Yes, I watched the demos.

In the Delphi introduction there is a second page with

TIWForm2.Create (WebApplication) .Show;

opened and displayed.

I have Unit1 and Unit2 with TIWForm1 and TIWForm2 respectively

I integrated Unit2 into Unit1. But none of the spellings lead to any result.

Here is the code

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

#include <vcl.h>

#pragma hdrstop

#include "Unit1.h"

#include "Unit2.h"

#include "UserSessionUnit.h"

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

#pragma package (smart_init)

#pragma link "uLoginDlg"

#pragma link "uSecControl"

#pragma link "IWCompGradButton"

#pragma resource "* .dfm"

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

__fastcall TIWForm1 :: TIWForm1 (TComponent * Owner)

: TIWAppForm (Owner)

{

}

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

void setAsMainForm () {

TIWForm1 :: SetAsMainForm ();

}

#pragma startup setAsMainForm

void __fastcall TIWForm1 :: IWGradButton1Click (TObject * Sender)

{

TIWForm1-> Show ();

}

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

10-24-2020, 08:21 PM:

When I say the expression

WebApplication-> ShowForm (TIWForm2);

comes the following error message:

[bcc32 error] Unit1.cpp (51): E2108 Invalid use of typedef 'TIWForm2'

Full parser context

Unit1.cpp (33): Analysis: void _fastcall TIWForm1 :: IWGradButton1Click (TObject *)

The form I want to call is called TIWForm2 and is in Unit2.

Unit2 is included via an include.

What can I do?

Thanks

10-27-2020, 02:53 PM:

TIWForm1-> Show ();

This will never work. TIWForm1 is the class. You need to create an instance of that class and call Show on the instance.

TIWForm2.Create (WebApplication) .Show;

This contains a constructor. In Delphi the constructor is the Create.