Close() gives an error message and doesn't close the application 1

[Alex314]

My skills as a programmer are limited, although I have been using C++Builder since version 3.

I have a project in C++Builder 2007 with a class having a property "aVers" returning the FileVersion in an AnsiString.
For certain values of FileVersion I want the application to show a message and close immediately after the OK button has been pressed. When I use the "Close()" function, the following message appears after I press OK: "Cannot change Visible in OnShow or OnHide." with the red dot and white cross in its window. After pressing OK again, the application is NOT closed.
To get it working I added a Timer component to the main Form with a 100 msec Interval. In the Timer function I call Close(). This setup works as I want it. But I have the feeling that it is not good practice...

The relevant code snippets follow.

  ...
    //                // this code is in the FormActivate function
    // get the version now
    //TRadio *VersObj;        // TRadio is defined in the Main Form header code.
    RadioObj = new TFreq;        // TFreq is a class derived from TRadio;
                    // retrieves the Version of App2 from
                    // "App2.exe". Makes use of "CreateProcess"
                    // and hides the console window when active.
    Version = RadioObj->aVers;
    delete RadioObj;
    RadioObj = NULL;

    if ((Version.AnsiPos("a")) || (Version.AnsiPos("b")))   {
        ShowMessage ("unsupported Version " + Version + ";\n"
        "          the application will exit.");
        //Timer1->Enabled = true;
        Close();
    }
    ...

    ...
    void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
    Close();
}
    ...

In this example, when I comment out "Close()" and uncomment "Timer1-> etc." it works fine; as shown it fails.

What can be the reason for the error message as described above and how should I tackle this problem? Your comments will be welcomed!

Alex314

 

[Prattaratt]

The global Application Variable has a Terminate Function which might be what you are looking for.

 

[Alex314]

Thanks! That does it. Things are simple if you happen to know them!!