Windows Mobile 编程 (Win32) - 获取设备能力
《Windows 程序设计》第五章重点讲述图形基础。首先一个示例代码是获取设备描述表信息。代码与Windows Mobile 编程 (Win32) - 输出文本中的代码类似。
#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, LPTSTR lpCmdLine, int nCmdShow) { static TCHAR szAppName[] = TEXT("DevCaps1"); HWND hwnd; MSG msg; WNDCLASS wc; ZeroMemory(&wc, sizeof(wc)); wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = WndProc; wc.hInstance = hInstance; wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wc.lpszClassName = szAppName; if (!RegisterClass(&wc)) { MessageBox(NULL, TEXT("RegisterClass() failed!"), szAppName, MB_ICONERROR); return 0; } hwnd = CreateWindow(szAppName, TEXT("Device Capabilities"), WS_OVERLAPPED | WS_SYSMENU, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); if (hwnd == NULL) { MessageBox(NULL, TEXT("CreateWindow() failed!"), szAppName, MB_ICONERROR); return 0; } ShowWindow(hwnd, nCmdShow); UpdateWindow(hwnd); while(GetMessage(&msg, NULL, 0, 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++) { ExtTextOut(hdc, 0, cyChar * i, 0, NULL, devcaps[i].szDesc, lstrlen(devcaps[i].szDesc), NULL); SetTextAlign(hdc, TA_RIGHT | TA_TOP); ExtTextOut(hdc, cxChar * 47, cyChar * i, 0, NULL, szBuffer, wsprintf(szBuffer, TEXT("%5d"), GetDeviceCaps(hdc, devcaps[i].iIndex)), NULL); SetTextAlign (hdc, TA_LEFT | TA_TOP) ; } EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0 ; } return DefWindowProc(hwnd, message, wParam, lParam); }