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C++ 6 21days

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Today you are going to learn • How to control and use timers in your Visual C++ applications. • How to set multiple timers, each with a different recurrence interval. • How to know which timer has triggered. • How you can incorporate this important resource into all your Visual C++ applications. - 4 - Working with Timers 41 42 - 4 - Working with Timers Understanding Windows Timers Windows timers are mechanisms that let you set one or more timers to be triggered at a specific number of milliseconds.

NOTE: The most common cursor change that you are likely to use in your programs is setting the cursor to the hourglass while your program is working on something that might take a while. There are actually two functions available in MFC that you can use to handle this task. The first is BeginWaitCursor, which displays the hourglass cursor for the user. The second function is EndWaitCursor, which restores the cursor to the default cursor. Both of these functions are members of the CCmdTarget class, from which all of the MFC window and control classes are derived.

1: void CMouseDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 2: { 3: // TODO: Add your message handler code here and/or call default 4: 5: /////////////////////// 6: // MY CODE STARTS HERE 7: /////////////////////// 8: 9: char lsChar; // The current character being pressed 10: HCURSOR lhCursor; // The handle to the cursor to be displayed 11: 12: // Convert the key pressed to a character 13: lsChar = char(nChar); 14: 15: // Is the character "A" 16: if (lsChar == `A') 17: { 18: // Load the arrow cursor 19: lhCursor = AfxGetApp()->LoadStandardCursor(IDC_ARROW); 20: // Set the screen cursor 21: SetCursor(lhCursor); 22: } 23: 24: // Is the character "B" 25: if (lsChar == `B') 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: { // Load the I beam cursor lhCursor = AfxGetApp()->LoadStandardCursor(IDC_IBEAM); // Set the screen cursor SetCursor(lhCursor); } // Is the character "C" if (lsChar == `C') { // Load the hourglass cursor 35 36 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: 55: 56: 57: 58: } lhCursor = AfxGetApp()->LoadStandardCursor(IDC_WAIT); // Set the screen cursor SetCursor(lhCursor); } // Is the character "X" if (lsChar == `X') { // Load the arrow cursor lhCursor = AfxGetApp()->LoadStandardCursor(IDC_ARROW); // Set the screen cursor SetCursor(lhCursor); // Exit the application OnOK(); } /////////////////////// // MY CODE ENDS HERE /////////////////////// CDialog::OnKeyDown(nChar, nRepCnt, nFlags); In the function definition, you see three arguments to the OnKeyDown function.

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