《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{intiIndex;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");HWNDhwnd;MSGmsg;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);}
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