获取GDI的 参数

#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[i].szLabel,lstrlen (devcaps[i].szLabel)) ;TextOut ( hdc, 14 * cxCaps, cyChar * i,devcaps[i].szDesc,lstrlen (devcaps[i].szDesc)) ;SetTextAlign (hdc, TA_RIGHT | TA_TOP) ;TextOut (hdc, 14*cxCaps+35*cxChar, cyChar*i, szBuffer,wsprintf (szBuffer, TEXT ("%5d"),GetDeviceCaps (hdc, devcaps[i].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) ;}