Lecture Two

Event Handling

Keyboard and Mouse Input

Contents Debug Technique Message Mapping in MFC Keyboard Msg Mouse Msg Other MSGs MessageBox

Debug Technique BreakPoint afxDump TRACE Debug Window

Message Mapping in MFC Detects event Determines which window get that event OS calls WndProc WndProc determines type of event/mes

sage Function in turn takes care of the event

Keyboard Msg Handle all Keyboard event Method to add event handler for a window OnChar(UINT nChar, UINT nRepCnt, UINT

nFlags) OnKeyDown(UINT nChar, UINT nRepCnt, U

INT nFlags) OnKeyUp(UINT nChar, UINT nRepCnt, UIN

T nFlags)

Mouse Msg Mouse Event Mouse click, movement Mouse wheel SetCapture, ReleaseCapture

Other MSGs WM_PAINT WM_TIMER WM_SIZE WM_CREATE WM_DESTROY

MessageBox Small Dialog Box notify user simple messag

e AfxMessageBox( LPCTSTR lpszText, UINT nType = MB_OK, UINT nIDHelp = 0 );

int CWnd::MessageBox( LPCTSTR lpszText, LPCTSTR lpszCaption = NULL, UINT nType = MB_OK );