READING KEYSTROKES FROM KEYBOARD

3.      READING KEYSTROKES FROM KEYBOARD

Step 1:-Select a NEW file.

Step 2:-Select a project tab from new window and from that select MFC application wizard [exe] option and give a project name as keystrokes and click ok.

Step 3:-

Þ    MFC Application Wizard Window is appeared.

Þ    Select a single document default settings in step1, click next

Þ    Select default settings from step2 to step6 and click finish

Þ    New projects information on window will appear and click ok

Step 4:-Go to workspace window and select file view tab. Select Header files and click on KeystrokesDoc.h, declare a string of text to hold data in MFC CString object.

                                    public:

                                                virtual ~CKeystrokesDoc();

                                                CString Strdata;

Step 5:-Double click on CKeyStrokes.Doc and in that select CKeyStrokes.Doc() Constructor and initialize the Strdata to an empty string as follows

                                    CKeyStrokesDoc::CKeyStrokesDoc()

                                    {         

                                                Strdata = “ “;

                                    }

Step 6:-To read Key Storkes we have to add an event handler

Þ    Goto View menu and from that select Class Wizard.

Þ    Select CKeystrokesView under class name menu and select WM_CHAR from messages menu and double click it this adds OnChar() event handler.

Step 7:-To store the character the user typed into Strdata, add code to OnChar() method from CKeystrokesView in class view tab double click it.

            void CKeystrokesView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)

                        {

                                    CKeystrokesDoc* pDoc = Get Document();

                                    ASSERT_VALID (pDoc);

                                    pDoc->Strdata += nChar;

                                    Invalidate();

                                    CView::OnChar(nChar, nRepeat, nFlags);

                        }

Step 8:-Customize On Draw() method from CKeystrokes View as follows.

                        void CKeystrokesView::OnDraw(CDC *pDC)

                        {

                                    CKeystrokes* pDoc = Get Document();

                                    ASSERT_VALID(pDoc);

                                    pDC-> TextOut(100, 100, pDoc-> Strdata);

                        }

Step 9:-Build………Compile……….Execute