OpenInputDesktop

The OpenInputDesktop function returns a handle to the desktop that receives user input. The input desktop is a desktop on the window station associated with the logged-on user.

HDESK OpenInputDesktop(
  DWORD dwFlags,         // flags to control interaction with other applications
  BOOL fInherit,         // specifies whether returned handle is inheritable
  DWORD dwDesiredAccess  // specifies access of returned handle
);
 

Parameters

dwFlags

A bit flag parameter that controls how the calling application will cooperate with other applications on the desktop. This parameter can specify zero or the following value:

Value	Description
DF_ALLOWOTHERACCOUNTHOOK	Allows processes running in other accounts on the desktop to set hooks in this process.

fInherit

Specifies whether the returned handle is inherited when a new process is created. If this value is TRUE, new processes will inherit the handle.

dwDesiredAccess

Specifies the access rights the returned handle has to the desktop. This parameter can include any of the standard access rights, such as READ_CONTROL or WRITE_DAC, and a combination of the following desktop-specific access rights.

Value	Description
DESKTOP_CREATEMENU	Required to create a menu on the desktop.
DESKTOP_CREATEWINDOW	Required to create a window on the desktop.
DESKTOP_ENUMERATE	Required for the desktop to be enumerated.
DESKTOP_HOOKCONTROL	Required to establish any of the window hooks.
DESKTOP_JOURNALPLAYBACK	Required to perform journal playback on the desktop.
DESKTOP_JOURNALRECORD	Required to perform journal recording on the desktop.
DESKTOP_READOBJECTS	Required to read objects on the desktop.
DESKTOP_SWITCHDESKTOP	Required to activate the desktop using SwitchDesktop.
DESKTOP_WRITEOBJECTS	Required to write objects on the desktop.

Return Values

If the function succeeds, the return value is a handle to the desktop that receives user input. When you are finished using the handle, call the CloseDesktop function to close it.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.

Remarks

The calling process must have an associated window station, either assigned by the system at process creation time or set by SetProcessWindowStation The window station associated with the calling process must be capable of receiving input.

An application can use the SwitchDesktop function to change the input desktop.

If the dwDesiredAccess parameter specifies the READ_CONTROL, WRITE_DAC, or WRITE_OWNER standard access rights to access the security descriptor of the desktop object, you must also request the DESKTOP_READOBJECTS and DESKTOP_WRITEOBJECTS access rights.

QuickInfo

  Windows NT: Requires version 3.51 or later.
  Windows: Unsupported.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.
  Import Library: Use user32.lib.

See Also

Window Stations and Desktops Overview, Window Station and Desktop Functions, CloseDesktop, SetProcessWindowStation, SwitchDesktop