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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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AttachThreadInput
The AttachThreadInput function attaches the input processing mechanism of one thread to that of
another thread.
BOOL AttachThreadInput(
DWORD idAttach,
| // thread to attach
| DWORD idAttachTo,
| // thread to attach to
| BOOL fAttach
| // attach or detach
| );
|
|
Parameters
idAttach
Specifies the identifier of the thread to be attached to another thread. The
thread to be attached cannot be a system thread.
idAttachTo
Specifies the identifier of the thread to be attached to. This thread cannot
be a system thread.
A thread cannot attach to itself. Therefore, idAttachTo cannot equal idAttach.
fAttach
Specifies whether to attach or detach the threads. If this parameter is TRUE,
the two threads are attached. If the parameter is FALSE, the threads are
detached.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. There is no extended error
information available.
Remarks
Windows created in different threads typically process input independently of
each other. That is, they have their own input states (focus, active, capture
windows, key state, queue status, and so on), and they are not synchronized with
the input processing of other threads. By using the AttachThreadInput function, a thread can attach its input processing to another thread. This
also allows threads to share their input states, so they can call the SetFocus function to set the keyboard focus to a window of a different thread. This
also allows threads to get key-state information. These capabilities are not
generally possible.
The AttachThreadInput function fails if either of the specified threads does not have a message
queue. The system creates a thread's message queue when the thread makes its first
call to one of the Win32 USER or GDI functions. The AttachThreadInput function also fails if a journal record hook is installed. Journal record
hooks attach all input queues together.
Note that key state, which can be ascertained by calls to the GetKeyState or GetKeyboardState function, is reset after a call to AttachThreadInput.
Windows NT: You cannot attach a thread to a thread in another desktop.
See Also
GetCurrentThreadId, GetKeyState, GetKeyboardState, GetWindowThreadProcessId, SetFocus
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