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- /*---------------------------------------
- MULTI1.C -- Multitasking Demo
- (c) Charles Petzold, 1998
- ---------------------------------------*/
-
- #include <windows.h>
- #include <math.h>
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int cyChar ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT ("Multi1") ;
- 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 iLine)
- {
- if (iLine * cyChar + cyChar > cyClient)
- {
- InvalidateRect (hwnd, NULL, TRUE) ;
- UpdateWindow (hwnd) ;
- iLine = 0 ;
- }
- return iLine ;
- }
-
- // ------------------------------------------------
- // Window 1: Display increasing sequence of numbers
- // ------------------------------------------------
-
- LRESULT APIENTRY WndProc1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static int iNum, iLine, cyClient ;
- HDC hdc ;
- TCHAR szBuffer[16] ;
-
- switch (message)
- {
- case WM_SIZE:
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_TIMER:
- if (iNum < 0)
- iNum = 0 ;
-
- iLine = CheckBottom (hwnd, cyClient, iLine) ;
- hdc = GetDC (hwnd) ;
-
- TextOut (hdc, 0, iLine * cyChar, szBuffer,
- wsprintf (szBuffer, TEXT ("%d"), iNum++)) ;
-
- ReleaseDC (hwnd, hdc) ;
- iLine++ ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
- // ------------------------------------------------------
- // Window 2: Display increasing sequence of prime numbers
- // ------------------------------------------------------
-
- LRESULT APIENTRY WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static int iNum = 1, iLine, cyClient ;
- HDC hdc ;
- int i, iSqrt ;
- TCHAR szBuffer[16] ;
-
- switch (message)
- {
- case WM_SIZE:
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_TIMER:
- 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 (hwnd, cyClient, iLine) ;
- hdc = GetDC (hwnd) ;
-
- TextOut (hdc, 0, iLine * cyChar, szBuffer,
- wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
-
- ReleaseDC (hwnd, hdc) ;
- iLine++ ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
- // ----------------------------------------------------------
- // Window 3: Display increasing sequence of Fibonacci numbers
- // ----------------------------------------------------------
-
- LRESULT APIENTRY WndProc3 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static int iNum = 0, iNext = 1, iLine, cyClient ;
- HDC hdc ;
- int iTemp ;
- TCHAR szBuffer[16] ;
-
- switch (message)
- {
- case WM_SIZE:
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_TIMER:
- if (iNum < 0)
- {
- iNum = 0 ;
- iNext = 1 ;
- }
-
- iLine = CheckBottom (hwnd, cyClient, iLine) ;
- hdc = GetDC (hwnd) ;
-
- TextOut (hdc, 0, iLine * cyChar, szBuffer,
- wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
-
- ReleaseDC (hwnd, hdc) ;
- iTemp = iNum ;
- iNum = iNext ;
- iNext += iTemp ;
- iLine++ ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
- // -----------------------------------------
- // Window 4: Display circles of random radii
- // -----------------------------------------
-
- LRESULT APIENTRY WndProc4 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static int cxClient, cyClient ;
- HDC hdc ;
- int iDiameter ;
-
- switch (message)
- {
- case WM_SIZE:
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_TIMER:
- InvalidateRect (hwnd, NULL, TRUE) ;
- UpdateWindow (hwnd) ;
-
- iDiameter = rand() % (max (1, min (cxClient, cyClient))) ;
- hdc = GetDC (hwnd) ;
-
- Ellipse (hdc, (cxClient - iDiameter) / 2,
- (cyClient - iDiameter) / 2,
- (cxClient + iDiameter) / 2,
- (cyClient + iDiameter) / 2) ;
-
- ReleaseDC (hwnd, hdc) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
- // -----------------------------------
- // Main window to create child windows
- // -----------------------------------
-
- LRESULT APIENTRY WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static HWND hwndChild[4] ;
- static TCHAR * szChildClass[] = { TEXT ("Child1"), TEXT ("Child2"),
- TEXT ("Child3"), TEXT ("Child4") } ;
- static WNDPROC ChildProc[] = { WndProc1, WndProc2, WndProc3, WndProc4 } ;
- HINSTANCE hInstance ;
- int i, cxClient, cyClient ;
- WNDCLASS wndclass ;
-
- switch (message)
- {
- case WM_CREATE:
- hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = NULL ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
-
- for (i = 0 ; i < 4 ; i++)
- {
- wndclass.lpfnWndProc = ChildProc[i] ;
- wndclass.lpszClassName = szChildClass[i] ;
-
- RegisterClass (&wndclass) ;
-
- hwndChild[i] = CreateWindow (szChildClass[i], NULL,
- WS_CHILDWINDOW | WS_BORDER | WS_VISIBLE,
- 0, 0, 0, 0,
- hwnd, (HMENU) i, hInstance, NULL) ;
- }
-
- cyChar = HIWORD (GetDialogBaseUnits ()) ;
- SetTimer (hwnd, 1, 10, NULL) ;
- return 0 ;
-
- case WM_SIZE:
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
-
- for (i = 0 ; i < 4 ; i++)
- MoveWindow (hwndChild[i], (i % 2) * cxClient / 2,
- (i > 1) * cyClient / 2,
- cxClient / 2, cyClient / 2, TRUE) ;
- return 0 ;
-
- case WM_TIMER:
- for (i = 0 ; i < 4 ; i++)
- SendMessage (hwndChild[i], WM_TIMER, wParam, lParam) ;
-
- return 0 ;
-
- case WM_CHAR:
- if (wParam == '\x1B')
- DestroyWindow (hwnd) ;
-
- return 0 ;
-
- case WM_DESTROY:
- KillTimer (hwnd, 1) ;
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-