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Windows NT
Yes
Win95
Yes
Win32s
Yes
Import Library
user32.lib
Header File
winuser.h
Unicode
No
Platform Notes
None

GetQueueStatus

The GetQueueStatus function returns flags that indicate the type of messages found in the calling thread's message queue.

DWORD GetQueueStatus(

UINT flags
// queue-status flags
);

Parameters

flags

Specifies queue-status flags giving the types of messages to check for. This parameter can be a combination of the following values:

Value
Meaning
QS_ALLEVENTS
An input, WM_TIMER, WM_PAINT, WM_HOTKEY, or posted message is in the queue.
QS_ALLINPUT
Any message is in the queue.
QS_HOTKEY
A WM_HOTKEY message is in the queue.
QS_INPUT
An input message is in the queue.
QS_KEY
A WM_KEYUP, WM_KEYDOWN, WM_SYSKEYUP, or WM_SYSKEYDOWN message is in the queue.
QS_MOUSE
A WM_MOUSEMOVE message or mouse-button message (WM_LBUTTONUP, WM_RBUTTONDOWN, and so on).
QS_MOUSEBUTTON
A mouse-button message (WM_LBUTTONUP, WM_RBUTTONDOWN, and so on).
QS_MOUSEMOVE
A WM_MOUSEMOVE message is in the queue.
QS_PAINT
A WM_PAINT message is in the queue.
QS_POSTMESSAGE
A posted message (other than those just listed) is in the queue.
QS_SENDMESSAGE
A message sent by another thread or application is in the queue.
QS_TIMER
A WM_TIMER message is in the queue.

Return Values

The high-order word of the return value indicates the types of messages currently in the queue. The low-order word indicates the types of messages that have been added to the queue and that are still in the queue since the last call to the GetQueueStatus, GetMessage, or PeekMessage function.

Remarks

The presence of a QS_ flag in the return value does not guarantee that a subsequent call to the PeekMessage or GetMessage function will return a message. GetMessage and PeekMessage perform some internal filtering that may cause the message to be processed internally. For this reason, the return value from GetQueueStatus should be considered only a hint as to whether GetMessage or PeekMessage should be called.

See Also

GetInputState
, GetMessage, PeekMessage

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