MTASK: Multitasking demo for Windows 3.1 PC Free Game Download

 MTASK demonstrates two methods of letting other applications run while your application is doing entensive work. Two dialog boxes are used. Both do a 20 second timed loop in the WM_INITDIALOG code. The NoFocusDlgProc() lets other applications run while doing it’s timed loop, but does not allow focus to be changed to another application. You can test this by running the Clock and watching the seconds update while the NoFocusDlgProc() is running. The second method, as shown by FocusOkDlgProc(), allows the user to change focus to another running application, except the parent window, of course. As can be seen in the FocusOkDlgProc(), you may want to protect your program during a loop like this since it’s possible for the user to close the dialog box while still running. The easiest way, of course, is to disable the OK button and System Menu before the loop executes and enable them again when the loop is finished. You can also use PeekMessage() with PM_NOREMOVE and test the message. If intended for the dialog window, it can be ignored. If not, then you can call PeekMessage() again using PM_REMOVE and do the usual Translate and Dispatch routine. Both of these routines are very simplistic. In real life, the Yield() and PeekMessage() code would more than likely be within a for() loop to allow more time to other applications. Basically, each time Yield()/PeekMessage() is called, one application is allowed one time slice, which is often not enough if the routine with the loop is lengthy.

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