The SendMessage function sends the specified message to a window or windows. The function calls the window procedure for the specified window and does not return until the window procedure has processed the message. The PostMessage function, in contrast, posts a message to a thread’s message queue and returns immediately.
LRESULT SendMessage(
HWND hWnd, |
// handle of destination window |
UINT Msg, |
// message to send |
WPARAM wParam, |
// first message parameter |
LPARAM lParam |
// second message parameter |
); |
The return value specifies the result of the message processing and depends on the message sent.
Applications that need to communicate using HWND_BROADCAST should use the RegisterWindowMessage function to obtain a unique message for inter-application communication.
If the specified window was created by the calling thread, the window procedure is called immediately as a subroutine. If the specified window was created by a different thread, Windows switches to that thread and calls the appropriate window procedure. Messages sent between threads are processed only when the receiving thread executes message retrieval code. The sending thread is blocked until the receiving thread processes the message.
InSendMessage, PostMessage, RegisterWindowMessage, SendDlgItemMessage
file: /Techref/os/win/api/win32/func/src/f75_15.htm, 3KB, , updated: 2022/5/24 16:59, local time: 2024/12/8 11:51,
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