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GetMessage The GetMessage function retrieves a message from the calling thread’s message queue and places it in the specified structure. This function can retrieve both messages associated with a specified window and thread messages posted via the PostThreadMessage function.
VB4-32,5,6
Declare Function GetMessage Lib "user32" Alias "GetMessageA" (lpMsg As MSG, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long) As Long |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 95 or later |
- lpMsg
Points to an MSG structure that receives message information from the thread’s message queue.
- hWnd
Identifies the window whose messages are to be retrieved. One value has a special meaning:
NULL
GetMessage retrieves messages for any window that belongs to the calling thread and thread messages posted to the calling thread via PostThreadMessage.
- wMsgFilterMin
Specifies the integer value of the lowest message value to be retrieved.
- wMsgFilterMax
Specifies the integer value of the highest message value to be retrieved. |
If the function retrieves a message other than WM_QUIT, the return value is nonzero.
If the function retrieves the WM_QUIT message, the return value is zero.
If there is an error, the return value is -1. For example, the function fails if hWnd is an invalid window handle. |
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