How to tell if Windows Taskbar's “autohide” is enabled?

Question

How can I tell via a Delphi program if the Windows Explorer Taskbar is set to Autohide?

Answer 1

In Windows XP and higher, you can call SHAppBarMessage API with ABM_GETSTATE message.

Syntax:

SHAppBarMessage(ABM_SETSTATE, pabd);

pabd is a pointer to APPBARDATA struct.
header file is: shellapi.h.

If you want to get state of taskbar, use ABM_GETSTATE message. you can call this api in delphi.

Answer 2

What is is that you really want to find out? Is it because you want to know the area of the screen that is useable?

If so, then I believe you can use the Screen.WorkAreaRect to determine the available screen area, where all (permanent) tool bars etc. are excluded.

Answer 3

Use Win32 shell apis (IsTBAutohide and others)
See Google Groups for undocumented apis.
Never read registry (ans stop removing right answers, it's stupid...)

Answer 4

U have to deal with windows registry because this information is keept in there. Value indicating "autoohide" is written(read) only while user logon /logout ont with his account

Registry key responsible for storing this information is located in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\StuckRects2 The only thing in there is settings and it is a 9th hex value for "autohide on" this value is 03 for "autohide off" it is 02