获取设备环境的信息
1 //DEVCAPS1.C--Device Capabilities Display Program No.1 (c) Charles Petzold, 1998 2 #include <Windows.h> 3 4 #define NUMLINES ((int) (sizeof(devcaps) / sizeof(devcaps[0]))) 5 struct 6 { 7 int iIndex; 8 TCHAR *szLabel; 9 TCHAR *szDesc; 10 } 11 devcaps[] = 12 { 13 HORZSIZE, TEXT("HORZSIZE"), TEXT("Width in millimeters:"), 14 VERTSIZE, TEXT("VERTSIZE"), TEXT("Height in milimeters:"), 15 HORZRES, TEXT("HORZRES"), TEXT("Width in pixels:"), 16 VERTRES, TEXT("VERTRES"), TEXT("Height in raster lines:"), 17 BITSPIXEL, TEXT("BITSPIXEL"), TEXT("Color bits per pixel:"), 18 PLANES, TEXT("PLANES"), TEXT("Number of color planes:"), 19 NUMBRUSHES, TEXT("NUMBRUSHES"), TEXT("Number of device brushes"), 20 NUMPENS, TEXT("NUMPENS"), TEXT("Number of device pens:"), 21 NUMMARKERS, TEXT("NUMMARKERS"), TEXT("Number of device markers:"), 22 NUMFONTS, TEXT("NUMFONTS"), TEXT("Number of device fonts:"), 23 NUMCOLORS, TEXT("NUMCOLORS"), TEXT("Number of device colors:"), 24 PDEVICESIZE, TEXT("PDEVICESIZE"), TEXT("Size of device structure:"), 25 ASPECTX, TEXT("ASPECTX"), TEXT("Relative width of pixel:"), 26 ASPECTY, TEXT("ASPECTY"), TEXT("Relative height of pixel:"), 27 ASPECTXY, TEXT("ASPECTXY"), TEXT("Relative diagonal of pixel:"), 28 LOGPIXELSX, TEXT("LOGPIXELSX"), TEXT("Horizontal dots per inch:"), 29 LOGPIXELSY, TEXT("LOGPIXELSY"), TEXT("Vertical dots per inch:"), 30 SIZEPALETTE, TEXT("SIZEPALETTE"), TEXT("Number of palette entries:"), 31 NUMRESERVED, TEXT("NUMRESERVED"), TEXT("Reserved palette entries:"), 32 COLORRES, TEXT("COLORRES"), TEXT("Actual color resolution:") 33 }; 34 35 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); 36 37 int WINAPI WinMain( __in HINSTANCE hInstance 38 , __in_opt HINSTANCE hPrevInstance 39 , __in LPSTR lpCmdLine 40 , __in int nShowCmd ) 41 { 42 static TCHAR szAppName[] = TEXT("DevCaps1"); 43 HWND hwnd; 44 MSG msg; 45 WNDCLASS wndclass; 46 47 wndclass.style = CS_HREDRAW | CS_VREDRAW; 48 wndclass.lpfnWndProc = WndProc; 49 wndclass.cbClsExtra = 0; 50 wndclass.cbWndExtra = 0; 51 wndclass.hInstance = hInstance; 52 wndclass.hIcon= LoadIcon(NULL, IDI_APPLICATION); 53 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); 54 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); 55 wndclass.lpszMenuName = NULL; 56 wndclass.lpszClassName = szAppName; 57 58 if (!RegisterClass(&wndclass)) 59 { 60 MessageBox(NULL, TEXT("This program requires Window NT!") 61 , szAppName, MB_ICONERROR); 62 return 0; 63 } 64 65 hwnd = CreateWindow(szAppName, TEXT("Device Capabilities") 66 , WS_OVERLAPPEDWINDOW 67 , CW_USEDEFAULT, CW_USEDEFAULT 68 , CW_USEDEFAULT, CW_USEDEFAULT 69 , NULL, NULL, hInstance, NULL); 70 71 ShowWindow(hwnd, nShowCmd); 72 UpdateWindow(hwnd); 73 74 while (GetMessage(&msg, NULL, 0, 0)) 75 { 76 TranslateMessage(&msg); 77 DispatchMessage(&msg); 78 } 79 80 return msg.wParam; 81 } 82 83 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 84 { 85 static int cxChar, cxCaps, cyChar; 86 TCHAR szBuffer[10]; 87 HDC hdc; 88 int i; 89 PAINTSTRUCT ps; 90 TEXTMETRIC tm; 91 92 switch (message) 93 { 94 case WM_CREATE: 95 hdc = GetDC(hwnd); 96 GetTextMetrics(hdc, &tm); 97 cxChar = tm.tmAveCharWidth; 98 cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2; 99 cyChar = tm.tmHeight + tm.tmExternalLeading; 100 ReleaseDC(hwnd, hdc); 101 return 0; 102 103 case WM_PAINT: 104 hdc = BeginPaint(hwnd, &ps); 105 for (i = 0; i != NUMLINES; ++i) 106 { 107 TextOut(hdc, 0, cyChar * i, devcaps[i].szLabel 108 , lstrlen(devcaps[i].szLabel)); 109 TextOut(hdc, 14 * cxCaps, cyChar * i, devcaps[i].szDesc 110 , lstrlen(devcaps[i].szDesc)); 111 SetTextAlign(hdc, TA_RIGHT | TA_TOP); 112 TextOut(hdc, 14 * cxCaps + 35 * cxChar, cyChar * i, szBuffer 113 , wsprintf(szBuffer, TEXT("%5d"), GetDeviceCaps(hdc, devcaps[i].iIndex))); 114 SetTextAlign(hdc, TA_LEFT | TA_TOP); 115 } 116 EndPaint(hwnd, &ps); 117 return 0; 118 119 case WM_DESTROY: 120 PostQuitMessage(0); 121 return 0; 122 } 123 124 return DefWindowProc(hwnd, message, wParam, lParam); 125 }