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- /* sysmets2.C - System Metrics Display Program No. 2
- Petzold
- */
-
- #include <windows.h>
- #include "sysmets.h"
-
- long FAR PASCAL WndProc (HWND, WORD, WORD, LONG);
-
- int PASCAL WinMain (HANDLE hInstance,
- HANDLE hPrevInstance,
- LPSTR lpszCmdParam,
- int nCmdShow)
-
- {
- static char szAppName[] = "sysmets2";
- HWND hwnd;
- MSG msg;
- WNDCLASS wndclass;
-
- if (!hPrevInstance)
- {
- 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 = GetStockObject (WHITE_BRUSH);
- wndclass.lpszMenuName = NULL;
- wndclass.lpszClassName = szAppName;
-
- RegisterClass(&wndclass);
- }
-
- hwnd = CreateWindow (szAppName,
- "Get System Metrics No. 2",
- WS_OVERLAPPEDWINDOW | WS_VSCROLL,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- NULL,
- NULL,
- hInstance,
- NULL);
-
- ShowWindow (hwnd, nCmdShow);
- UpdateWindow (hwnd);
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg);
- DispatchMessage (&msg);
- }
-
- return msg.wParam;
- }
-
- long FAR PASCAL WndProc (HWND hwnd,
- WORD message,
- WORD wParam,
- LONG lParam)
-
- {
- static short cxChar, cxCaps, cyChar, cxClient, cyClient, nVscrollPos;
- char szBuffer[10];
- short i, y;
- TEXTMETRIC tm;
- HDC hdc;
- PAINTSTRUCT ps;
-
- switch (message)
- {
- case WM_CREATE:
- hdc = GetDC (hwnd);
-
- GetTextMetrics (hdc, &tm);
- cxChar = tm.tmAveCharWidth;
- cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar /2;
- cyChar = tm.tmHeight + tm.tmExternalLeading;
-
- ReleaseDC (hwnd, hdc);
-
- SetScrollRange (hwnd, SB_VERT, 0, NUMLINES, FALSE);
- SetScrollPos (hwnd, SB_VERT, nVscrollPos, TRUE);
-
- return 0;
-
- case WM_SIZE:
- cyClient = HIWORD (lParam);
- cxClient = LOWORD (lParam);
- return 0;
-
- case WM_VSCROLL:
- switch (wParam)
- {
- case SB_LINEUP:
- nVscrollPos -= 1;
- break;
-
- case SB_LINEDOWN:
- nVscrollPos += 1;
- break;
-
- case SB_PAGEUP:
- nVscrollPos -= cyClient / cyChar;
- break;
-
- case SB_PAGEDOWN:
- nVscrollPos += cyClient / cyChar;
- break;
-
- case SB_THUMBPOSITION:
- nVscrollPos = LOWORD (lParam);
- break;
-
- default:
- break;
- }
- nVscrollPos = max (0, min (nVscrollPos, NUMLINES));
-
- if (nVscrollPos != GetScrollPos (hwnd, SB_VERT))
- {
- SetScrollPos (hwnd, SB_VERT, nVscrollPos, TRUE);
- InvalidateRect (hwnd, NULL, TRUE);
- }
-
- return 0;
-
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps);
-
- for (i = 0; i < NUMLINES; i++)
- {
- y = cyChar * ( 1 - nVscrollPos + i);
-
- TextOut (hdc, cxChar, y,
- sysmetrics[i].szLabel,
- lstrlen (sysmetrics[i].szLabel));
-
- TextOut (hdc, cxChar + 18 * cxCaps, y,
- sysmetrics[i].szDesc,
- lstrlen (sysmetrics[i].szDesc));
-
- SetTextAlign (hdc, TA_RIGHT | TA_TOP);
-
- TextOut (hdc, cxChar + 18 * cxCaps + 40 * cxChar,
- y,
- szBuffer,
- wsprintf(szBuffer, "%5d",
- GetSystemMetrics (sysmetrics[i].nIndex)));
-
- SetTextAlign (hdc, TA_LEFT | TA_TOP);
- }
-
- EndPaint (hwnd, &ps);
- return 0;
-
- case WM_DESTROY:
- PostQuitMessage (0);
- return 0;
- }
-
- return DefWindowProc (hwnd, message, wParam, lParam);
- }
-
-