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GetQueueStatus (Windows CE 5.0)

Windows CE 5.0
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This function indicates the type of messages found in the calling thread's message queue.

DWORD GetQueueStatus(
  UINT flags
);

Parameters

flags
[in] Specifies the types of messages for which to check. This parameter can be one or more of the values shown in the following table.
ValueDescription
QS_ALLEVENTSAn input, WM_TIMER, WM_PAINT, WM_HOTKEY, or posted message is in the queue.
QS_ALLINPUTAny message is in the queue.
QS_ALLPOSTMESSAGEA posted message (other than those listed here) is in the queue.
QS_HOTKEYA WM_HOTKEY message is in the queue.
QS_INPUTAn input message is in the queue. This is composed of QS_KEY and QS_MOUSE.
QS_KEYA WM_KEYUP, WM_KEYDOWN, WM_SYSKEYUP, or WM_SYSKEYDOWN message is in the queue.
QS_MOUSEA WM_MOUSEMOVE message or mouse-button message (WM_LBUTTONUP, WM_RBUTTONDOWN, and so on) is in the queue.
QS_MOUSEBUTTONA mouse-button message (WM_LBUTTONUP, WM_RBUTTONDOWN, and so on) is in the queue.
QS_MOUSEMOVEA WM_MOUSEMOVE message is in the queue.
QS_PAINTA WM_PAINT message is in the queue.
QS_POSTMESSAGEA posted message (other than those listed here) is in the queue.
QS_SENDMESSAGEA message sent by another thread or application is in the queue.
QS_TIMERA 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 GetMessage or PeekMessage function will return a message. GetMessage and PeekMessage perform some internal filtering that may cause the message to be processed internally.

The QS_ALLPOSTMESSAGE and QS_POSTMESSAGE flags differ in the following ways:

  • QS_POSTMESSAGE is cleared when you call GetMessage or PeekMessage, regardless of whether you are filtering messages.
  • QS_ALLPOSTMESSAGE is cleared when you call GetMessage or PeekMessage without filtering messages; that is, when the wMsgFilterMin and wMsgFilterMax parameters for GetMessage or PeekMessage are zero. This can be useful when you call PeekMessage multiple times to get messages in different ranges.

Requirements

OS Versions: Windows CE .NET 4.2 and later.
Header: Winuser.h.
Link Library: Coredll.lib.

See Also

Message Queue Functions | GetMessage | PeekMessage | WM_TIMER | WM_PAINT | WM_HOTKEY | WM_KEYUP | WM_KEYDOWN | WM_SYSKEYUP | WM_SYSKEYDOWN | WM_MOUSEMOVE | WM_LBUTTONUP | WM_RBUTTONDOWN | WM_MOUSEMOVE


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