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WM_QUEUESYNC message

  • Article

Sent by a computer-based training (CBT) application to separate user-input messages from other messages sent through the WH_JOURNALPLAYBACK procedure.

#define WM_QUEUESYNC                    0x0023

Parameters

wParam

This parameter is not used.

lParam

This parameter is not used.

Return value

Type: void

A CBT application should return zero if it processes this message.

Remarks

Whenever a CBT application uses the WH_JOURNALPLAYBACK procedure, the first and last messages are WM_QUEUESYNC. This allows the CBT application to intercept and examine user-initiated messages without doing so for events that it sends.

If an application specifies a NULL window handle, the message is posted to the message queue of the active window.

Requirements

Requirement Value
Minimum supported client
 Windows XP [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Winuser.h (include Windows.h)

See also

Reference

JournalPlaybackProc

SetWindowsHookEx

Conceptual

Hooks