ON_MESSAGE

Статья
10/16/2008

Indicates which function will handle a user-defined message.

ON_MESSAGE(message, memberFxn )

Параметры

message
The message ID.
memberFxn
The name of the message-handler function to which the message is mapped.

The type of the function must be afx_msg LRESULT (CWnd::*)(WPARAM, LPARAM).

Заметки

User-defined messages are usually defined in the range WM_USER to 0x7FFF. User-defined messages are any messages that are not standard Windows WM_MESSAGE messages. There should be exactly one ON_MESSAGE macro statement in your message map for every user-defined message that must be mapped to a message-handler function.

Примечание.
In addition to user-defined messages, ON_MESSAGE handles less common Windows messages. For more information, see the Knowledge Base article Q99848.

For more information and examples, see Message Handling and Mapping Topics and User-Defined Handlers

Пример

#define WM_MYMESSAGE (WM_USER + 100)

BEGIN_MESSAGE_MAP(CMyWnd2, CWnd)
   ON_MESSAGE(WM_MYMESSAGE, OnMyMessage)
END_MESSAGE_MAP()

LRESULT CMyWnd2::OnMyMessage(WPARAM wParam, LPARAM lParam)
{
   UNREFERENCED_PARAMETER(wParam);
   UNREFERENCED_PARAMETER(lParam);

   // Handle message here.

   return 0;
}