How to hide form from taskbar in c++ builder? - c++

Question

I have simple VCL Forms application which on start show on taskbar button if is in use, what i want to do is to hide those button, so that mean whatever is happen with form that those button don't appear. Case can be that forms is shown or hidden or any other but button have to be hidden, how to do that?
P.S. I see that question like this exist but they don't work in my cause.

Answer 1

Not only did I have to do what Spook answered, but also (thanks to http://codeverge.com/embarcadero.cppbuilder.ide/builder-c++-xe-and-hiding-taskbar/1073223)
void __fastcall TForm1::FormCreate(TObject *Sender)
{
Application->MainFormOnTaskBar = false;
DWORD dwExStyle = GetWindowLong(Application->Handle, GWL_EXSTYLE);
dwExStyle &= ~WS_EX_APPWINDOW;
dwExStyle |= WS_EX_TOOLWINDOW;
SetWindowLong(Application->Handle, GWL_EXSTYLE, dwExStyle);
}
void __fastcall TForm1::FormActivate(TObject *Sender)
{
ShowWindow(Application->Handle, SW_HIDE);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::CreateParams(TCreateParams &Params)
{
TForm::CreateParams(Params);
Params.ExStyle &= ~WS_EX_APPWINDOW;
Params.ExStyle |= WS_EX_TOOLWINDOW;
}

Answer 2

Try the following approach:
Set MainFormOnTaskBar to false
Call ShowWindow(Application->Handle, SW_HIDE); inside the main form's OnShow event handler.
Call ShowWindow(Application->Handle, SW_HIDE); inside the main form's OnActivate event handler.
Source: http://delphi.about.com/od/delphitips2008/qt/hide_taskbutton.htm