二、Windows图形处理!设备内容(DEVCAPS1程序)

 
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[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) ;
 
}