| 词条 | DEVCAPS1程式 |
| 释义 | § 说明 程式5-1 DEVCAPS1 DEVCAPS1.C /*------------------------------------------------------------------------ DEVCAPS1.C -- Device Capabilities Display Program No. 1 (c) Charles Petzold, 1998 ----------------------------------------------------------------------*/ #include <windows.h> #define NUMLINES ((int) (sizeof devcaps / sizeof devcaps 【0】)) struct { int iIndex ; TCHAR * szLabel ; TCHAR * szDesc ; } devcaps 【】 = { HORZSIZE, TEXT ("HORZSIZE"),TEXT ("Width in millimeters:"), VERTSIZE, TEXT ("VERTSIZE"),TEXT ("Height in millimeters:"), HORZRES, TEXT ("HORZRES"), TEXT ("Width in pixels:"), VERTRES, TEXT ("VERTRES"), TEXT ("Height in raster lines:"), BITSPIXEL, TEXT ("BITSPIXEL"),TEXT ("Color bits per pixel:"), PLANES, TEXT ("PLANES"), TEXT ("Number of color planes:"), NUMBRUSHES, TEXT ("NUMBRUSHES"), TEXT ("Number of device brushes:"), NUMPENS, TEXT ("NUMPENS"), TEXT ("Number of device pens:"), NUMMARKERS, TEXT ("NUMMARKERS"), TEXT ("Number of device markers:"), NUMFONTS, TEXT ("NUMFONTS"), TEXT ("Number of device fonts:"), NUMCOLORS, TEXT ("NUMCOLORS"), TEXT ("Number of device colors:"), PDEVICESIZE, TEXT ("PDEVICESIZE"), TEXT ("Size of device structure:"), ASPECTX, TEXT ("ASPECTX"), TEXT ("Relative width of pixel:"), ASPECTY, TEXT ("ASPECTY"), TEXT ("Relative height of pixel:"), ASPECTXY, TEXT ("ASPECTXY"), TEXT ("Relative diagonal of pixel:"), LOGPIXELSX, TEXT ("LOGPIXELSX"), TEXT ("Horizontal dots per inch:"), LOGPIXELSY, TEXT ("LOGPIXELSY"), TEXT ("Vertical dots per inch:"), SIZEPALETTE, TEXT ("SIZEPALETTE"), TEXT ("Number of palette entries:"), NUMRESERVED, TEXT ("NUMRESERVED"), TEXT ("Reserved palette entries:"), COLORRES, TEXT ("COLORRES"), TEXT ("Actual color resolution:") } ; LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName【】 = TEXT ("DevCaps1") ; 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 ("Device Capabilities"), 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 ; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static int cxChar, cxCaps, cyChar ; TCHAR szBuffer【10】 ; HDC hdc ; int i ; PAINTSTRUCT ps ; TEXTMETRIC tm ; 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) ; return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; for (i = 0 ; i < NUMLINES ; i++) { TextOut ( hdc, 0, cyChar * i, devcaps.szLabel, lstrlen (devcaps.szLabel)) ; TextOut ( hdc, 14 * cxCaps, cyChar * i, devcaps.szDesc, lstrlen (devcaps.szDesc)) ; SetTextAlign (hdc, TA_RIGHT | TA_TOP) ; TextOut (hdc, 14*cxCaps+35*cxChar, cyChar*i, szBuffer, wsprintf (szBuffer, TEXT ("%5d"), GetDeviceCaps (hdc, devcaps.iIndex))) ; SetTextAlign (hdc, TA_LEFT | TA_TOP) ; } EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; } 可以看到，这个程式非常类似第四章的SYSMETS1。为了保持程式码的短小，我没有使用卷动列，因为我知道资讯可以在一个画面上显示出来。 |
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