20. 多任务和多线程.txt

本书介绍了在Microsoft Windows 98、Microsoft Windows NT 4.0和Windows NT 5.0下程序写作的方法

        
{
        
           static TCHAR szAppName[] = TEXT ("Multi2") ;
        
           HWND                                 hwnd ;
        
           MSG                                  msg ;
        
           WNDCLASS                      wndclass ;
        
 
        
           wndclass.style                               = CS_HREDRAW | CS_VREDRAW ;
        
           wndclass.lpfnWndProc                         = WndProc ;
        
           wndclass.cbClsExtra                          = 0 ;
        
           wndclass.cbWndExtra                          = 0 ;
        
           wndclass.hInstance                           = hInstance ;
        
           wndclass.hIcon                              = LoadIcon (NULL, IDI_APPLICATION) ;
        
           wndclass.hCursor                             = LoadCursor (NULL, IDC_ARROW) ;
        
           wndclass.hbrBackground              = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
        
           wndclass.lpszMenuName                = NULL ;
        
           wndclass.lpszClassName               = szAppName ;
        
   
        
           if (!RegisterClass (&wndclass))
        
           {
        
       MessageBox (NULL, TEXT ("This program requires Windows NT!"),
        
                  szAppName, MB_ICONERROR) ;
        
                  return 0 ;
        
           }
        
   
        
           hwnd = CreateWindow ( szAppName, TEXT ("Multitasking Demo"),
        
                         WS_OVERLAPPEDWINDOW,
        
                         CW_USEDEFAULT, CW_USEDEFAULT,
        
                        CW_USEDEFAULT, CW_USEDEFAULT,
        
                         NULL, NULL, hInstance, NULL) ;
        
   
        
          ShowWindow (hwnd, iCmdShow) ;
        
           UpdateWindow (hwnd) ;
        
   
        
           while (GetMessage (&msg, NULL, 0, 0))
        
           {
        
                  TranslateMessage (&msg) ;
        
                  DispatchMessage (&msg) ;
        
           }
        
           return msg.wParam ;
        
}
        

int CheckBottom (HWND hwnd, int cyClient, int cyChar, int iLine)
        
{
        
           if (iLine * cyChar + cyChar > cyClient)
        
           {
        
                  InvalidateRect (hwnd, NULL, TRUE) ;
        
                  UpdateWindow (hwnd) ;
        
                iLine = 0 ;
        
           }
        
           return iLine ;
        
}
        

// --------------------------------------------------------------------------
        
// Window 1: Display increasing sequence of numbers
        
// --------------------------------------------------------------------------
        

void Thread1 (PVOID pvoid)
        
{
        
           HDC                         hdc ;
        
           int                           iNum = 0, iLine = 0 ;
        
           PPARAMS               pparams ;
        
           TCHAR                         szBuffer[16] ;
        
   
        
           pparams       = (PPARAMS) pvoid ;
        
   
        
           while (!pparams->bKill)
        
           {
        
                  if (iNum < 0)
        
                                         iNum = 0 ;
        
                  iLine = CheckBottom ( pparams->hwnd,        pparams->cyClient,
        
   pparams->cyChar,iLine) ;
        

                  hdc = GetDC (pparams->hwnd) ;
        
        
        
                  TextOut (     hdc, 0, iLine * pparams->cyChar, szBuffer,
        
                                                        wsprintf (szBuffer, TEXT ("%d"), iNum++)) ;             
        
        
        
                  ReleaseDC (pparams->hwnd, hdc) ;
        
                  iLine++ ;
        
           }
        
    _endthread () ;
        
}
        

LRESULT APIENTRY WndProc1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
        
{
        
           static PARAMS params ;
        
           switch (message)
        
           {
        
          case   WM_CREATE:
        
                          params.hwnd = hwnd ;
        
                          params.cyChar = HIWORD (GetDialogBaseUnits ()) ;
        
                          _beginthread (Thread1, 0, 秏s) ;
        
                          return 0 ;
        
        
        
           case   WM_SIZE:
        
                         params.cyClient = HIWORD (lParam) ;
        
                         return 0 ;
        
        
        
           case   WM_DESTROY:
        
                          params.bKill = TRUE ;
        
                          return 0 ;
        
           }
        
           return DefWindowProc (hwnd, message, wParam, lParam) ;
        
}
        

// --------------------------------------------------------------------------
        
// Window 2: Display increasing sequence of prime numbers
        
// --------------------------------------------------------------------------
        

void Thread2 (PVOID pvoid)
        
{
        
    HDC                           hdc ;
        
           int                           iNum = 1, iLine = 0, i, iSqrt ;
        
           PPARAMS               pparams ;
        
           TCHAR                         szBuffer[16] ;
        
   
        
           pparams = (PPARAMS) pvoid ;
        
           while (!pparams->bKill)
        
           {
        
                  do
        
                  {
        
                                  if (++iNum < 0)
        
                                                iNum = 0 ;
        
                                  iSqrt = (int) sqrt (iNum) ;
        
                                  for (i = 2 ; i <= iSqrt ; i++)
        
                                                 if (iNum % i == 0)
        
                                                                        break ;
        
                  }
        
                  while (i <= iSqrt) ;
        
                  iLine = CheckBottom   (      pparams->hwnd,       pparams->cyClient,
        
   pparams->cyChar,iLine) ;
        
        
        
                  hdc = GetDC (pparams->hwnd) ;
        
        
        
                  TextOut (     hdc, 0, iLine * pparams->cyChar, szBuffer,
        
                                                         wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
        
        
        
                  ReleaseDC (pparams->hwnd, hdc) ;
        
                  iLine++ ;
        
           }
        
    _endthread () ;
        
}
        

LRESULT APIENTRY WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
        
{
        
           static PARAMS params ;
        
           switch (message)
        
           {
        
           case   WM_CREATE:
        
                          params.hwnd = hwnd ;
        
                          params.cyChar = HIWORD (GetDialogBaseUnits ()) ;
        
                          _beginthread (Thread2, 0, 秏s) ;
        
                          return 0 ;
        
        
        
           case   WM_SIZE:
        
                          params.cyClient = HIWORD (lParam) ;
        
                          return 0 ;
        
        
        
           case   WM_DESTROY:
        
                          params.bKill = TRUE ;
        
                          return 0 ;
        
           }
        
           return DefWindowProc (hwnd, message, wParam, lParam) ;
        
}
        

// Window 3: Display increasing sequence of Fibonacci numbers
        
// ----------------------------------------------------------
        

void Thread3 (PVOID pvoid)
        
{
        
           HDC                           hdc ;