What API function do I need to use to know if a windows is beeing shown in the taskbar?

Question

I am making a taskbar in C# and I know how to get a list of open windows, but I must know what windows I must show in the taskbar. How can I do this?

Answer 1

I'm not sure if the exact algorithm is known, but you will not be far off with something like:

if style & WS_VISIBLE 
{
  if ( ( exstyle & WS_EX_APPWINDOW ) 
  or ( !HasOwnerWindow() and !(exstyle & WS_EX_TOOLWINDOW) ) 
  {
        ShowWindowInYourTaskBar()
  }
}