C++ Builder bizarre issue (taskbar icon not appearing)?

Question

I have an application with a login form (which is the main form) and a main form, which is opened after the log-in one is filled in with the correct info.

However, the program icon does not appear on the taskbar. I would like to ask, why does this happen?

Answer 1

I don't think there is anything bizarre in this behaviour. I assume You hide login form after user provides login information?

By default Main form owns taskbar:

Application->MainFormOnTaskBar = true;

So either make frmMain "main" instead of LoginForm and create login form dynamically before main Form (this will make login form invisible on taskbar) or add following code to frmMain - in header:

void __fastcall CreateParams(Controls::TCreateParams &Params);

and in the .cpp file:

void __fastcall frmMain::CreateParams(Controls::TCreateParams &Params)
{
  TForm::CreateParams(Params);
  Params.ExStyle   = Params.ExStyle | WS_EX_APPWINDOW;
  Params.WndParent = ParentWindow;
}

WS_EX_APPWINDOW "Forces a top-level window onto the taskbar when the window is visible."

As described in this MSDN article

and Embarcadero DocWiki.