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What is a message map?


Message map is dynamic function locater
It can look each function if it defined


void OnWndMessage(UINT message, WPARAM wParam, LPARAM
lParam, LRESULT *pResult)

// function looking MESSAGE_MAPS ((DECLARED))
// if found, CWnd::OnSize(UINT nStyle, int cx, int cy);
__thisclass.OnSize(wParam, HIWORD(lParam), LOWORD(lParam);

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