function checks a thread message queue for a message and places the message
(if any) in the specified structure.
| LPMSG lpMsg,
||// pointer to structure for message
| HWND hWnd,
||// handle to window
| UINT wMsgFilterMin,
||// first message
| UINT wMsgFilterMax,
||// last message
| UINT wRemoveMsg
||// removal flags
Points to an MSG
structure that contains message information from the Windows-based
Identifies the window whose messages are to be examined.
Specifies the value of the first message in the range of messages to be
Specifies the value of the last message in the range of messages to be
Specifies how messages are handled. This parameter can be one of the following
||Messages are not removed from the queue after processing by PeekMessage.
||Messages are removed from the queue after processing by PeekMessage.
You can optionally combine the value PM_NOYIELD with either PM_NOREMOVE or
PM_REMOVE. However, PM_NOYIELD has no effect on 32-bit Windows applications. It is
defined in Win32 solely to provide compatibility with applications written for
previous versions of Windows, where it was used to prevent the current task
from halting and yielding system resources to another task. 32-bit Windows
applications always run simultaneously.
If a message is available, the return value is nonzero.
If no messages are available, the return value is zero.
Unlike the GetMessage
function, the PeekMessage
function does not wait for a message to be placed in the queue before
retrieves only messages associated with the window identified by the hWnd
parameter or any of its children as specified by the IsChild
function, and within the range of message values given by the wMsgFilterMin
parameters. If hWnd
is NULL, PeekMessage
retrieves messages for any window that belongs to the current thread making
the call. (PeekMessage
does not retrieve messages for windows that belong to other threads.) If hWnd
only returns messages with a hWnd
value of NULL, as posted by the PostAppMessage
function. If wMsgFilterMin
are both zero, PeekMessage
returns all available messages (that is, no range filtering is performed).
The WM_KEYFIRST and WM_KEYLAST constants can be used as filter values to
retrieve all keyboard messages; the WM_MOUSEFIRST and WM_MOUSELAST constants can be
used to retrieve all mouse messages.
function normally does not remove WM_PAINT messages from the queue. WM_PAINT
messages remain in the queue until they are processed. However, if a WM_PAINT
message has a null update region, PeekMessage
does remove it from the queue.
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