PostMessage (Windows CE 5.0)
This function places a message in the message queue associated with the thread that created the specified window and then returns without waiting for the thread to process the message. Messages in a message queue are retrieved by calls to the GetMessage or PeekMessage function.
BOOLPostMessage(HWNDhWnd, UINTMsg, WPARAMwParam, LPARAMlParam );
Parameters
- hWnd
[in] Handle to the window whose window procedure is to receive the message. Two values have special meanings.Value Description HWND_BROADCAST The message is posted to all top-level windows in the system, including disabled or invisible unowned windows, overlapped windows, and pop-up windows. The message is not posted to child windows. NULL The function behaves like a call to PostThreadMessage with the dwThreadId parameter set to the identifier of the current thread. - Msg
[in] Specifies the message to be posted. - wParam
[in] Specifies additional message-specific information. - lParam
[in] Specifies additional message-specific information.
Return Values
Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.
Remarks
Applications that need to communicate using HWND_BROADCAST should use the RegisterWindowMessage function to obtain a unique message for inter-application communication.
If you send a message in the range below WM_USER to the asynchronous message functions (PostMessage and SendNotifyMessage), its message parameters cannot include pointers. Otherwise, the operation will fail. The functions will return before the receiving thread has had a chance to process the message and the sender will free the memory before it is used.
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Winuser.h.
Link Library: Coredll.lib.
See Also
Message Queue Functions | GetMessage | PeekMessage | PostThreadMessage | RegisterWindowMessage | SendDlgItemMessage | SendMessage
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